Pollinator

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A syrphid fly (Eristalinus taeniops) pollinating a common hawkweed Eristalinus October 2007-6.jpg
A syrphid fly ( Eristalinus taeniops ) pollinating a common hawkweed
A mining bee (Andrena lonicerae) pollinating a honeysuckle (Lonicera gracilipes).

A pollinator is an animal that moves pollen from the male anther of a flower to the female stigma of a flower. [1] This helps to bring about fertilization of the ovules in the flower by the male gametes from the pollen grains.

Contents

Insects are the major pollinators of most plants, and insect pollinators include all families of bees and most families of aculeate wasps; ants; many families of flies; many lepidopterans (both butterflies and moths); and many families of beetles. Vertebrates, mainly bats and birds, but also some non-bat mammals (monkeys, lemurs, possums, rodents) and some lizards pollinate certain plants. Among the pollinating birds are hummingbirds, honeyeaters and sunbirds with long beaks; they pollinate a number of deep-throated flowers. Humans may also carry out artificial pollination.

A pollinator is different from a pollenizer, a plant that is a source of pollen for the pollination process.

Background

Plants fall into pollination syndromes that reflect the type of pollinator being attracted. These are characteristics such as: overall flower size, the depth and width of the corolla, the color (including patterns called nectar guides that are visible only in ultraviolet light), the scent, amount of nectar, composition of nectar, etc. [2] For example, birds visit red flowers with long, narrow tubes and much nectar, but are not as strongly attracted to wide flowers with little nectar and copious pollen, which are more attractive to beetles. When these characteristics are experimentally modified (altering colour, size, orientation), pollinator visitation may decline. [3] [4]

Although non-bee pollinators have been seen to be less effective at depositing pollen than bee pollinators [5] one study showed that non-bees made more visits than bees resulting in non-bees performing 38% of visits to crop flowers, outweighing the ineffectiveness of their ability to pollinate. [6] [5]

It has recently been discovered that cycads, which are not flowering plants, are also pollinated by insects. [7] In 2016, researchers showed evidence of pollination occurring underwater, which was previously thought not to happen. [8] [9]

Types of pollinators

Insects

Bees

Lipotriches sp. bee pollinating flowers Lipotriches sp..jpg
Lipotriches sp. bee pollinating flowers

The most recognized pollinators are the various species of bees, [10] which are plainly adapted to pollination. Bees typically are fuzzy and carry an electrostatic charge. Both features help pollen grains adhere to their bodies, but they also have specialized pollen-carrying structures; in most bees, this takes the form of a structure known as the scopa, which is on the hind legs of most bees, and/or the lower abdomen (e.g., of megachilid bees), made up of thick, plumose setae. Honey bees, bumblebees, and their relatives do not have a scopa, but the hind leg is modified into a structure called the corbicula (also known as the "pollen basket"). Most bees gather nectar, a concentrated energy source, and pollen, which is high protein food, to nurture their young, and transfer some among the flowers as they are working. [11] Euglossine bees pollinate orchids, but these are male bees collecting floral scents rather than females gathering nectar or pollen. Female orchid bees act as pollinators, but of flowers other than orchids. Eusocial bees such as honey bees need an abundant and steady pollen source to multiply.

Honey bee pollinating a plum tree. Bees are the most effective insect pollinators. PrunusCerasifera0.jpg
Honey bee pollinating a plum tree. Bees are the most effective insect pollinators.

Honey bees travel from flower to flower, collecting nectar (later converted to honey), and pollen grains. The bee collects the pollen by rubbing against the anthers. The pollen collects on the hind legs, in a structure referred to as a "pollen basket". As the bee flies from flower to flower, some of the pollen grains are transferred onto the stigma of other flowers. Nectar provides the energy for bee nutrition; pollen provides the protein. When bees are rearing large quantities of brood (beekeepers say hives are "building"), bees deliberately gather pollen to meet the nutritional needs of the brood.

Good pollination management seeks to have bees in a "building" state during the bloom period of the crop, thus requiring them to gather pollen, and making them more efficient pollinators. Thus, the management techniques of a beekeeper providing pollination services are different from, and to some extent in tension with, those of a beekeeper who is trying to produce honey. Millions of hives of honey bees are contracted out as pollinators by beekeepers, and honey bees are by far the most important commercial pollinating agents, but many other kinds of pollinators, from blue bottle flies, to bumblebees, orchard mason bees, and leaf cutter bees are cultured and sold for managed pollination.

Other species of bees differ in various details of their behavior and pollen-gathering habits, and honey bees are not native to the Western Hemisphere; all pollination of native plants in the Americas and Australia historically has been performed by various native bees. It has also been found that non-native plants may have positive effects on native bee pollinators while also influencing their foraging patterns and bee–plant networks. [12]

Butterflies and moths

An Australian painted lady feeding on nectar Australian painted lady feeding closeup.jpg
An Australian painted lady feeding on nectar

Lepidoptera (butterflies and moths) may also pollinate to various degrees. [13] They are not major pollinators of food crops, but various moths are important pollinators of other commercial crops such as tobacco. Pollination by certain moths may be important, however, or even crucial, for some wildflowers mutually adapted to specialist pollinators. Spectacular examples include orchids such as Angraecum sesquipedale , dependent on a particular hawk moth, Morgan's sphinx. Yucca species provide other examples, being fertilised in elaborate ecological interactions with particular species of yucca moths.

Flies

Many bee flies, and some Tabanidae and Nemestrinidae are particularly adapted to pollinating fynbos and Karoo plants with narrow, deep corolla tubes, such as Lapeirousia species. Part of the adaptation takes the form of remarkably long probosces. This also applies to empidine dance flies (Empidinae) that visit a wide range of flowering plants, some species of which can pollinate the woodland geranium (Geranium sylvaticum L.) as effectively as bees. [14]

Tabanid fly on a thistle flower Goudoogdaas zijaanzicht 2009 08 23.png
Tabanid fly on a thistle flower

Carrion flies and flesh flies in families such as Calliphoridae and Sarcophagidae are important for some species of plants whose flowers exude a fetid odor. The plants' ecological strategy varies; several species of Stapelia , for example, attract carrion flies that futilely lay their eggs on the flower, where their larvae promptly starve for lack of carrion. Other species do decay rapidly after ripening, and offer the visiting insects large masses of food, as well as pollen and sometimes seed to carry off when they leave.

Hoverflies are important pollinators of flowering plants worldwide. [15] Often hoverflies are considered to be the second most important pollinators after wild bees. [15] Although hoverflies as a whole are generally considered to be nonselective pollinators, some species have more specialized relationships. The orchid species Epipactis veratrifolia mimics alarm pheromones of aphids to attract hover flies for pollination. [16] Another plant, the slipper orchid in southwest China, also achieves pollination by deceit by exploiting the innate yellow colour preference of syrphids. [17]

Some male dacine fruit flies are exclusive pollinators of some wild Bulbophyllum orchids that lack nectar and have a specific chemical attractant and reward (methyl eugenol, raspberry ketone or zingerone) present in their floral fragrances. [18] [19] [20]

Other insects

A Scoliid wasp (Scolia chrysotricha) foraging Unidentified Scoliidae foraging 2012 02 26 3034s.jpg
A Scoliid wasp (Scolia chrysotricha) foraging

Many insects other than bees accomplish pollination by visiting flowers for nectar or pollen, or commonly both. Many do so adventitiously, but the most important pollinators are specialists for at least parts of their life cycles for at least certain functions.

Prominent among Hymenoptera other than bees are predatory aculeate wasps (especially Crabronidae, Sphecidae, Vespidae, and Pompilidae). The term "pollen wasps", in particular, is widely applied to the Masarinae, a subfamily of the Vespidae; they are remarkable among solitary wasps in that they specialise in gathering pollen for feeding their larvae, carried internally and regurgitated into a mud chamber prior to oviposition. Also, males of many species of bees and wasps, though they do not gather pollen, rely on flowers as sources of energy (in the form of nectar) and also as territories for meeting fertile females that visit the flowers.

Some Diptera (flies) may be the main pollinators at higher elevations of mountains, [21] [22] whereas bumblebee species are typically the only other pollinators in alpine regions at timberline and beyond.

Some adult mosquitoes, if they feed on nectar, may act as pollinators; Aedes communis, a species found in North America, is known to pollinate Platanthera obtusata , commonly referred as the blunt-leaved orchid. [23] [24]

Beetles of species that specialise in eating pollen, nectar, or flowers themselves, may be important cross-pollinators of some plants such as members of the Araceae and Zamiaceae, that produce prodigious amounts of pollen. Others, for example the Hopliini, specialise on flowers of Asteraceae and Aizoaceae.

Minute midges and flower-thrips can occur in vast numbers, moving between flowers and plant individuals, enabling some species to contribute to the pollination of tree-crops such as cacao, Theobroma cacao [25] L. (Malvaceae) and elderflower Sambucus nigra L. (Adoxaceae). [26] Ants also pollinate some kinds of flowers, but for the most part they are parasites, consuming nectar and/or pollen without conveying useful amounts of pollen to a stigma. Other insect orders are rarely pollinators, and then typically only incidentally (e.g., Hemiptera such as Anthocoridae and Miridae).

A strategy of great biological interest is that of sexual deception, where plants, generally orchids, produce remarkably complex combinations of pheromonal attractants and physical mimicry that induce male bees or wasps to attempt to mate with them, conveying pollinia in the process. Examples are known from all continents apart from Antarctica, though Australia appears to be exceptionally rich in examples. [27]

Whole groups of plants, such as certain fynbos Moraea and Erica species produce flowers on sticky peduncles or with sticky corolla tubes that only permit access to flying pollinators, whether bird, bat, or insect.

Other invertebrates

Experimental evidence has shown invertebrates (mostly small crustaceans [9] ) acting as pollinators in underwater environments. Beds of seagrass have been shown to reproduce this way in the absence of currents. It is not yet known how important invertebrate pollinators might be for other species. [8] [28] Later, Idotea balthica was discovered to help Gracilaria gracilis reproduce – the first known case of an animal helping algae reproduce. [29] [30]

Vertebrates

Tropical flowers like Tacca chantrieri are bat-pollinated. Tacca chantrieri172799839.jpg
Tropical flowers like Tacca chantrieri are bat-pollinated.
Green violetear with pollen on bill, Curi Cancha Wildlife Refuge, Costa Rica Colibri thalassinus Curicancha 02.jpg
Green violetear with pollen on bill, Curi Cancha Wildlife Refuge, Costa Rica

Bats are important pollinators of some tropical flowers, visiting to take nectar. [31] Birds, particularly hummingbirds, honeyeaters and sunbirds also accomplish much pollination, especially of deep-throated flowers. Other vertebrates, such as kinkajous, monkeys, lemurs, possums, rodents and lizards [32] [33] have been recorded pollinating some plants.

Humans can be pollinators, as many gardeners have discovered that they must hand pollinate garden vegetables, whether because of pollinator decline or simply to keep a strain genetically pure. This can involve using a small brush or cotton swab to move pollen, or to simply tap or shake tomato blossoms to release the pollen for the self-pollinating flowers. Tomato blossoms are self-fertile, but (with the exception of potato-leaf varieties) have the pollen inside the anther, and the flower requires shaking to release the pollen through pores. This can be done by wind, by humans, or by a sonicating bee (one that vibrates its wing muscles while perched on the flower), such as a bumblebee. Sonicating bees are extremely efficient pollinators of tomatoes, and colonies of bumblebees are quickly replacing humans as the primary pollinators for greenhouse tomatoes.

Floral and non-floral resources

Pollinators require a variety of resources. Most native bees in North America are solitary, ground-nesting species that collect a variety of natural resources including pollen, nectar, leaves, petals and resins to be used as sources of food, supplies for their larva, or nest linings. [34] Floral diet diversity has been seen to increase immunocompetence levels in honeybees (Apis mellifera) where diets that consisted of a wide variety of flowering species induced higher glucose oxidase activity, which honeybees' produce to sterilize their colony. [35] More than 30% of global bee species depend on non-floral resources for nest building, protection, health, pest resistance, and alternative food sources. [36] Non-floral resources include leaves, soil, plant resins and secretions, and are often provided by woody-vegetation.

Pollinator population declines and conservation

Pollinators provide a key ecosystem service vital to the maintenance of both wild and agricultural plant communities. In 1999 the Convention on Biological Diversity issued the São Paulo Declaration on Pollinators, recognizing the critical role that these species play in supporting and maintaining terrestrial productivity as well as the survival challenges they face due to anthropogenic change. Today pollinators are considered to be in a state of decline; [37] some species, such as Franklin's bumble bee ( Bombus franklini ) have been red-listed and are in danger of extinction. Although managed bee hives are increasing worldwide, these can not compensate for the loss of wild pollinators in many locations.

A 2017 report done for the Center of Biological Diversity utilized data documented in the United States on native bee species and found that nearly 1 in 4 (347 species of 1,437 species) is imperiled and at increasing risk of extinction. More than half of the native bee species is in decline and 40% of global insect pollinators (primarily native bees) are highly threatened. [34]

Declines in the health and population of pollinators pose what could be a significant threat to the integrity of biodiversity, to global food webs, and to human health. At least 80% of our world's crop species require pollination to set seed. A 2021 study estimated that without pollinators, fertility would be reduced by 80% in half all wild plant species and one-third of all wild plant species would fail to produce any seeds at all. [38]

An estimated one out of every three bites of food comes to us through the work of animal pollinators. The quality of pollinator service has declined over time and this had led to concerns that pollination will be less resistant to extinction in the future.

A 2022 study concludes that the decline of pollinator populations is responsible for 500,000 early human deaths per year by reducing the supply of healthy foods. A decline of pollinators has caused 3-5% loss of fruits, vegetables and nuts. Lower consumption of these healthy foods translates to 1% of all deaths, according to the authors. [39] [40]

Pesticide usage

Neonicotinoids (Neonics) are a class of synthetic insecticides that are the most widely applied pesticides today due to its water solubility and ability to treat a wide variety of pests. Neonics are highly environmentally persistent, and may contaminate terrestrial and aquatic habitats for as much as six years. Exposed honeybees' (Apis mellifera) have been seen to have lower reproductive output, reduction in nest building or failed to build nests, reduced foraging abilities, and weakened immunity. [41]

Strategy

Researchers are still trying to determine how to scientifically best restore and maintain the diverse pollinator habitats found around the world. Many studies conclude that restoration and conservation are key to maintaining biodiversity and pollinator populations. According to the Kansas National Park Service, native tallgrass prairie was widespread through North America and home to over 300 species of flowering plants. This habitat is crucial to wild pollinators and now only covers 4% of its original 170-million acre range. [42] By restoring wild pollinators natural habitat and maintaining Earth's biodiversity, populations are assumed to increase. In recent times, environmental groups have put pressure on the Environmental Protection Agency to ban neonicotinoids, a type of insecticide.

On June 20, 2014, President Barack Obama issued a presidential memorandum entitled "Creating a Federal Strategy to Promote the Health of Honey Bees and Other Pollinators". The President's memorandum established a Pollinator Health Task Force, to be co-chaired by the Secretary of Agriculture and the Administrator of the Environmental Protection Agency. The memorandum stated:

Pollinators contribute substantially to the economy of the United States and are vital to keeping fruits, nuts, and vegetables in our diets. Honey bee pollination alone adds more than $15 billion in value to agricultural crops each year in the United States. Over the past few decades, there has been a significant loss of pollinators, including honey bees, native bees, birds, bats, and butterflies, from the environment. The problem is serious and requires immediate attention to ensure the sustainability of our food production systems, avoid additional economic impact on the agricultural sector, and protect the health of the environment.

Pollinator losses have been severe. The number of migrating Monarch butterflies sank to the lowest recorded population level in 2013-14, and there is an imminent risk of failed migration. The continued loss of commercial honey bee colonies poses a threat to the economic stability of commercial beekeeping and pollination operations in the United States, which could have profound implications for agriculture and food. Severe yearly declines create concern that bee colony losses could reach a point from which the commercial pollination industry would not be able to adequately recover. The loss of native bees, which also play a key role in pollination of crops, is much less studied, but many native bee species are believed to be in decline. Scientists believe that bee losses are likely caused by a combination of stressors, including poor bee nutrition, loss of forage lands, parasites, pathogens, lack of genetic diversity, and exposure to pesticides. [43]

In May 2015, the Pollinator Health Task Force issued a "National Strategy to Promote the Health of Honey Bees and Other Pollinators". The national strategy outlined a comprehensive approach to tackling and reducing the impact of multiple stressors on pollinator health, including pests and pathogens, reduced habitat, lack of nutritional resources, and exposure to pesticides. [44] [45]

The national strategy laid out federal actions to achieve three goals:

  • Honey Bees: Reduce honey bee colony losses during winter (overwintering mortality) to no more than 15% within 10 years.
  • Monarch Butterflies: Increase the Eastern population of the monarch butterfly to 225 million butterflies occupying an area of approximately 15 acres (6 hectares) in the overwintering grounds in Mexico, through domestic/international actions and public-private partnerships, by 2020.
  • Pollinator Habitat Acreage: Restore or enhance 7 million acres of land for pollinators over the next 5 years through Federal actions and public/private partnerships. [44] [45]

Many of the priority projects that the national strategy identified focused on the I-35 corridor, which extends for 1,500 miles (2,400 km) from Texas to Minnesota. The area through which that highway travels provides spring and summer breeding habitats in the United States' key monarch migration corridor. [44] [45]

The Pollinator Health Task Force simultaneously issued a "Pollinator Research Action Plan". The Plan outlined five main action areas, covered in ten subject-specific chapters. The action areas were: (1) Setting a Baseline; (2) Assessing Environmental Stressors; (3) Restoring Habitat; (4) Understanding and Supporting Stakeholders; (5) Curating and Sharing Knowledge. [45] [46]

In June 2016, the Task Force issued a "Pollinator Partnership Action Plan". That Plan provided examples of past, ongoing, and possible future collaborations between the federal government and non-federal institutions to support pollinator health under each of the national strategy's goals. [47]

North America

The North American Pollinator Protection Campaign (NAPPC) aims to promote pollinator health across the North America and has organized annual conferences since 1997, creates task forces to implement specific objectives that includes public education and policy research, and is developing strategic plans for conservation that looks to establish partnership between government entities. 11 pollinator-protection agreements have been signed between NAPCC and federal government agencies, responsible for more than 1.5 billion acres of land protections and management. [48]

Europe

Along with the European Green Deal, which contains initiatives that support pollinator populations, the European Union has implemented the EU Biodiversity Strategy for 2030 which includes the EU Pollinators Initiative that sets long-term objectives to reverse pollinator decline in diversity and numbers by 2030. This initiative includes: (1) improving knowledge of pollinator decline, its causes and consequences; (2) tackling the causes of pollinator decline; and (3) raising awareness, engaging society-at-large and promoting collaboration. [49]

South America

The Healthy Hives Latin America 2020 (Salud Apícola 2020 Latinoamérica) program is a collaboration between the Bayer Bee Care Center and the Fraunhofer Chile Research Foundation, that works alongside local researchers at universities and beekeepers' associations. The program focuses on increasing the number of healthy worker bees and their colonies by monitoring honey bee health and the contributing factors. This includes educating beekeepers and research collaborations to jointly work on honey bee health. Founded in 2015 with a preliminary project in Chile, the program has expanded to Colombia, Argentina, and Costa Rica. [50]

Global

The ‘Coalition of the Willing on Pollinators' (Promote Pollinators) was initiated in 2016 during the Convention on Biological Diversity's Conference of the Parties (CBD COP13) and is a growing alliance of countries and observers who support the notion that country-led politics can lead to policy measures and innovative action to protect pollinators'. Their supporters are growing steadily, in which 30 countries currently participate. [51]

Structure of plant-pollinator networks

Wild pollinators often visit many plant species and plants are visited by many pollinator species. All these relations together form a network of interactions between plants and pollinators. Surprising similarities were found in the structure of networks consisting out of the interactions between plants and pollinators. This structure was found to be similar in very different ecosystems on different continents, consisting of entirely different species. [52]

The structure of plant-pollinator networks may have large consequences for the way in which pollinator communities respond to increasingly harsh conditions. Mathematical models, examining the consequences of this network structure for the stability of pollinator communities suggest that the specific way in which plant-pollinator networks are organized minimizes competition between pollinators [53] and may even lead to strong indirect facilitation between pollinators when conditions are harsh. [54] This allows pollinator species to survive together under harsh conditions. But it also means that pollinator species collapse simultaneously when conditions pass a critical point. This simultaneous collapse occurs, because pollinator species depend on each other when surviving under difficult conditions. [54]

Such a community-wide collapse, involving many pollinator species, can occur suddenly when increasingly harsh conditions pass a critical point and recovery from such a collapse might not be easy. The improvement in conditions needed for pollinators to recover, could be substantially larger than the improvement needed to return to conditions at which the pollinator community collapsed. [54]

See also

Related Research Articles

<span class="mw-page-title-main">Bee</span> Clade of insects

Bees are winged insects closely related to wasps and ants, known for their roles in pollination and, in the case of the best-known bee species, the western honey bee, for producing honey. Bees are a monophyletic lineage within the superfamily Apoidea. They are currently considered a clade, called Anthophila. There are over 20,000 known species of bees in seven recognized biological families. Some species – including honey bees, bumblebees, and stingless bees – live socially in colonies while most species (>90%) – including mason bees, carpenter bees, leafcutter bees, and sweat bees – are solitary.

<span class="mw-page-title-main">Honey bee</span> Colonial flying insect of genus Apis

A honey bee is a eusocial flying insect within the genus Apis of the bee clade, all native to mainland Afro-Eurasia. After bees spread naturally throughout Africa and Eurasia, humans became responsible for the current cosmopolitan distribution of honey bees, introducing multiple subspecies into South America, North America, and Australia.

<span class="mw-page-title-main">Hoverfly</span> Family of insects

Hoverflies, also called flower flies or syrphids, make up the insect family Syrphidae. As their common name suggests, they are often seen hovering or nectaring at flowers; the adults of many species feed mainly on nectar and pollen, while the larvae (maggots) eat a wide range of foods. In some species, the larvae are saprotrophs, eating decaying plant and animal matter in the soil or in ponds and streams. In other species, the larvae are insectivores, preying on aphids, thrips, and other plant-sucking insects.

<span class="mw-page-title-main">Coevolution</span> Two or more species influencing each others evolution

In biology, coevolution occurs when two or more species reciprocally affect each other's evolution through the process of natural selection. The term sometimes is used for two traits in the same species affecting each other's evolution, as well as gene-culture coevolution.

<span class="mw-page-title-main">Pollination</span> Biological process occurring in plants

Pollination is the transfer of pollen from an anther of a plant to the stigma of a plant, later enabling fertilisation and the production of seeds. Pollinating agents can be animals such as insects, for example beetles or butterflies; birds, and bats; water; wind; and even plants themselves. Pollinating animals travel from plant to plant carrying pollen on their bodies in a vital interaction that allows the transfer of genetic material critical to the reproductive system of most flowering plants. When self-pollination occurs within a closed flower. Pollination often occurs within a species. When pollination occurs between species, it can produce hybrid offspring in nature and in plant breeding work.

<span class="mw-page-title-main">Pollinator decline</span> Reduction in abundance of insect and other animal pollinators

Pollinator decline is the reduction in abundance of insect and other animal pollinators in many ecosystems worldwide that began being recorded at the end of the 20th century. Multiple lines of evidence exist for the reduction of wild pollinator populations at the regional level, especially within Europe and North America. Similar findings from studies in South America, China and Japan make it reasonable to suggest that declines are occurring around the globe. The majority of studies focus on bees, particularly honeybee and bumblebee species, with a smaller number involving hoverflies and lepidopterans.

<span class="mw-page-title-main">Entomophily</span> Form of pollination by insects

Entomophily or insect pollination is a form of pollination whereby pollen of plants, especially but not only of flowering plants, is distributed by insects. Flowers pollinated by insects typically advertise themselves with bright colours, sometimes with conspicuous patterns leading to rewards of pollen and nectar; they may also have an attractive scent which in some cases mimics insect pheromones. Insect pollinators such as bees have adaptations for their role, such as lapping or sucking mouthparts to take in nectar, and in some species also pollen baskets on their hind legs. This required the coevolution of insects and flowering plants in the development of pollination behaviour by the insects and pollination mechanisms by the flowers, benefiting both groups. Both the size and the density of a population are known to affect pollination and subsequent reproductive performance.

<span class="mw-page-title-main">Zoophily</span> Pollination by animals

Zoophily, or zoogamy, is a form of pollination whereby pollen is transferred by animals, usually by invertebrates but in some cases vertebrates, particularly birds and bats, but also by other animals. Zoophilous species frequently have evolved mechanisms to make themselves more appealing to the particular type of pollinator, e.g. brightly colored or scented flowers, nectar, and appealing shapes and patterns. These plant-animal relationships are often mutually beneficial because of the food source provided in exchange for pollination.

<span class="mw-page-title-main">Nectar</span> Sugar-rich liquid produced by many flowering plants, that attracts pollinators and insects

Nectar is a viscous, sugar-rich liquid produced by plants in glands called nectaries, either within the flowers with which it attracts pollinating animals, or by extrafloral nectaries, which provide a nutrient source to animal mutualists, which in turn provide herbivore protection. Common nectar-consuming pollinators include mosquitoes, hoverflies, wasps, bees, butterflies and moths, hummingbirds, honeyeaters and bats. Nectar plays a crucial role in the foraging economics and evolution of nectar-eating species; for example, nectar foraging behavior is largely responsible for the divergent evolution of the African honey bee, A. m. scutellata and the western honey bee.

<span class="mw-page-title-main">Nectarivore</span> Animal in which nectar is a main source of nutrition in their diet

In zoology, a nectarivore is an animal which derives its energy and nutrient requirements from a diet consisting mainly or exclusively of the sugar-rich nectar produced by flowering plants.

<span class="mw-page-title-main">Ornithophily</span> Pollination by birds

Ornithophily or bird pollination is the pollination of flowering plants by birds. This sometimes coevolutionary association is derived from insect pollination (entomophily) and is particularly well developed in some parts of the world, especially in the tropics, Southern Africa, and on some island chains. The association involves several distinctive plant adaptations forming a "pollination syndrome". The plants typically have colourful, often red, flowers with long tubular structures holding ample nectar and orientations of the stamen and stigma that ensure contact with the pollinator. Birds involved in ornithophily tend to be specialist nectarivores with brushy tongues and long bills, that are either capable of hovering flight or light enough to perch on the flower structures.

<span class="mw-page-title-main">Palynivore</span> Group of herbivorous animals

In zoology, a palynivore /pəˈlɪnəvɔːɹ/, meaning "pollen eater" is an herbivorous animal which selectively eats the nutrient-rich pollen produced by angiosperms and gymnosperms. Most true palynivores are insects or mites. The category in its strictest application includes most bees, and a few kinds of wasps, as pollen is often the only solid food consumed by all life stages in these insects. However, the category can be extended to include more diverse species. For example, palynivorous mites and thrips typically feed on the liquid content of the pollen grains without actually consuming the exine, or the solid portion of the grain. Additionally, the list is expanded greatly if one takes into consideration species where either the larval or adult stage feeds on pollen, but not both. There are other wasps which are in this category, as well as many beetles, flies, butterflies, and moths. One such example of a bee species that only consumes pollen in its larval stage is the Apis mellifera carnica. There is a vast array of insects that will feed opportunistically on pollen, as will various birds, orb-weaving spiders and other nectarivores.

<span class="mw-page-title-main">Pollination syndrome</span> Flower traits that attract pollinators

Pollination syndromes are suites of flower traits that have evolved in response to natural selection imposed by different pollen vectors, which can be abiotic or biotic, such as birds, bees, flies, and so forth through a process called pollinator-mediated selection. These traits include flower shape, size, colour, odour, reward type and amount, nectar composition, timing of flowering, etc. For example, tubular red flowers with copious nectar often attract birds; foul smelling flowers attract carrion flies or beetles, etc.

<span class="mw-page-title-main">Bees and toxic chemicals</span>

Bees can suffer serious effects from toxic chemicals in their environments. These include various synthetic chemicals, particularly insecticides, as well as a variety of naturally occurring chemicals from plants, such as ethanol resulting from the fermentation of organic materials. Bee intoxication can result from exposure to ethanol from fermented nectar, ripe fruits, and manmade and natural chemicals in the environment.

<span class="mw-page-title-main">Pouyannian mimicry</span> Evolutionary strategy

Pouyannian mimicry is a form of mimicry in plants that deceives an insect into attempting to copulate with a flower. The flower mimics a potential female mate of a male insect, which then serves the plant as a pollinator. The mechanism is named after the French lawyer and amateur botanist Maurice-Alexandre Pouyanne. The resemblance that he noted is visual, but the key stimuli that deceive the pollinator are often chemical and tactile. In orchids, the resemblance is to a species of bee; Pouyanne observed the bee Dasyscolia ciliata pollinating the orchid Ophrys speculum.

<span class="mw-page-title-main">Western honey bee</span> European honey bee

The western honey bee or European honey bee is the most common of the 7–12 species of honey bees worldwide. The genus name Apis is Latin for 'bee', and mellifera is the Latin for 'honey-bearing' or 'honey-carrying', referring to the species' production of honey.

<span class="mw-page-title-main">Pollination trap</span> Plant flower structures

Pollination traps or trap-flowers are plant flower structures that aid the trapping of insects, mainly flies, so as to enhance their effectiveness in pollination. The structures of pollination traps can include deep tubular corollas with downward pointing hairs, slippery surfaces, adhesive liquid, attractants, flower closing and other mechanisms.

<span class="mw-page-title-main">Pollen theft</span> Net removal of pollen by an animal

Pollen theft, also known as pollen robbery or floral larceny, occurs when an animal actively eats or collects pollen from a plant species but provides little or no pollination in return. Pollen theft was named as a concept at least as early as the 1980, and examples have been documented well before that. For example, native honey bees were documented 'stealing' large amounts of pollen from the large, bat-pollinated flowers of Parkia clappertoniana in Ghana in the 1950s. Nevertheless, pollen theft has typically received far less research attention than nectar robbing, despite the more direct consequences on plant reproduction.

<span class="mw-page-title-main">Pollinator garden</span> Type of garden

A pollinator garden is a type of garden designed with the intent of growing specific nectar and pollen-producing plants, in a way that attracts pollinating insects known as pollinators. Pollinators aid in the production of one out of every three bites of food consumed by humans, and pollinator gardens are a way to offer support for these species. In order for a garden to be considered a pollinator garden, it should provide various nectar producing flowers, shelter or shelter-providing plants for pollinators, and avoid the use of pesticides.

References

  1. ↑ "Pollinator". What is a pollinator?. 3 February 2021.
  2. ↑ Fægri K, van der Pijl L (1979). The Principles of Pollination Ecology. Oxford: Pergamon.
  3. ↑ Fulton M, Hodges SA (1999). "Floral isolation between Aquilegia formosa and A. pubescens". Proceedings of the Royal Society of London, Series B. 266 (1435): 2247–2252. doi:10.1098/rspb.1999.0915. PMC   1690454 .
  4. ↑ Hodges SA, Whittall JB, Fulton M, Yang JY (March 2002). "Genetics of floral traits influencing reproductive isolation between Aquilegia formosa and Aquilegia pubescens". The American Naturalist. 159 (Suppl 3): S51–60. doi:10.1086/338372. PMID   18707369. S2CID   3399289.
  5. 1 2 Rader R, Howlett BG, Cunningham SA, Westcott DA, Newstrom-Lloyd LE, Walker MK, et al. (October 2009). "Alternative pollinator taxa are equally efficient but not as effective as the honeybee in a mass flowering crop". Journal of Applied Ecology. 46 (5): 1080–1087. Bibcode:2009JApEc..46.1080R. doi: 10.1111/j.1365-2664.2009.01700.x .
  6. ↑ Rader R, Bartomeus I, Garibaldi LA, Garratt MP, Howlett BG, Winfree R, et al. (5 January 2016). "Non-bee insects are important contributors to global crop pollination". Proceedings of the National Academy of Sciences. 113 (1): 146–151. Bibcode:2016PNAS..113..146R. doi: 10.1073/pnas.1517092112 . ISSN   0027-8424. PMC   4711867 . PMID   26621730.
  7. ↑ Stevenson DW, Norstog LJ, Fawcett PK (1998). "Pollination Biology Of Cycads". In Owens SJ, Rudall PJ (eds.). Reproductive Biology. Kew: Royal Botanic Gardens. Retrieved 9 December 2014.
  8. 1 2 "The new underwater world of pollination". Conservation. 5 October 2016. Retrieved 18 October 2021.
  9. 1 2 Benson E. "Bees of the sea: Tiny crustaceans pollinate underwater plants". New Scientist. Retrieved 18 October 2021.
  10. ↑ Klein AM, Vaissière BE, Cane JH, Steffan-Dewenter I, Cunningham SA, Kremen C, et al. (February 2007). "Importance of pollinators in changing landscapes for world crops". Proceedings. Biological Sciences. 274 (1608): 303–313. doi:10.1098/rspb.2006.3721. PMC   1702377 . PMID   17164193.
  11. ↑ Westbrook FE, Bergman PW, Wearne RA (1975). Pollination and the Honey Bee. Washington D.C.: U.S. Government Printing Office.
  12. ↑ Seitz N, vanEngelsdorp D, Leonhardt SD (2020). "Are native and non-native pollinator friendly plants equally valuable for native wild bee communities?". Ecology and Evolution. 10 (23): 12838–12850. Bibcode:2020EcoEv..1012838S. doi:10.1002/ece3.6826. ISSN   2045-7758. PMC   7713930 . PMID   33304497.
  13. ↑ "Butterfly Pollination". Celebrating Butterflies. U.S. Forestry Service. Archived from the original on 23 July 2011.
  14. ↑ Lefebvre V, Daugeron C, Villemant C, Fontaine C (July 2019). "Empidine dance flies pollinate the woodland geranium as effectively as bees". Biology Letters. 15 (7): 20190230. doi:10.1098/rsbl.2019.0230. PMC   6684995 . PMID   31362609.
  15. 1 2 Larson BM, Kevan PG, Inouye DW (2001). "Flies and flowers: taxonomic diversity of anthophiles and pollinators". Canadian Entomologist. 133 (4): 439–465. doi:10.4039/ent133439-4. S2CID   55767580.
  16. ↑ Stökl J, Brodmann J, Dafni A, Ayasse M, Hansson BS (April 2011). "Smells like aphids: orchid flowers mimic aphid alarm pheromones to attract hoverflies for pollination". Proceedings. Biological Sciences. 278 (1709): 1216–1222. doi:10.1098/rspb.2010.1770. PMC   3049078 . PMID   20943694.
  17. ↑ Shi J, Luo YB, Bernhardt P, Ran JC, Liu ZJ, Zhou Q (January 2009). "Pollination by deceit in Paphiopedilum barbigerum (Orchidaceae): a staminode exploits the innate colour preferences of hoverflies (Syrphidae)". Plant Biology. 11 (1): 17–28. Bibcode:2009PlBio..11...17S. doi:10.1111/j.1438-8677.2008.00120.x. PMID   19121110.
  18. ↑ Tan KH, Nishida R, Toong YC (2002). "Bulbophyllum cheiri floral synomone lures fruit flies to perform pollination". Journal of Chemical Ecology. 28 (6): 1161–1172. doi:10.1023/A:1016277500007. PMID   12184394. S2CID   36621985.
  19. ↑ Tan K, Nishida R (2005). "Synomone or kairomone?-Bulbophyllum apertum flower releases raspberry ketone to attract Bactrocera fruit flies". Journal of Chemical Ecology. 31 (3): 497–507. Bibcode:2005JCEco..31..497K. doi:10.1007/s10886-005-2023-8. PMID   15898497. S2CID   39173699.
  20. ↑ Tan KH, Nishida R (June 2007). "Zingerone in the floral synomone of Bulbophyllum baileyi (Orchidaceae) attracts Bactrocera fruit flies during pollination". Biochemical Systematics and Ecology. 35 (6): 334–341. Bibcode:2007BioSE..35..334T. doi:10.1016/j.bse.2007.01.013.
  21. ↑ Lefebvre V, Fontaine C, Villemant C, Daugeron C (November 2014). "Are empidine dance flies major flower visitors in alpine environments? A case study in the Alps, France". Biology Letters. 10 (11): 20140742. doi:10.1098/rsbl.2014.0742. PMC   4261866 . PMID   25376804.
  22. ↑ Lefebvre V, Villemant C, Fontaine C, Daugeron C (March 2018). "Altitudinal, temporal and trophic partitioning of flower-visitors in Alpine communities". Scientific Reports. 8 (1): 4706. Bibcode:2018NatSR...8.4706L. doi:10.1038/s41598-018-23210-y. PMC   5856740 . PMID   29549294.
  23. ↑ "Year of Pollination: Mosquitoes as Pollinators". awkward botany. 8 July 2015. Retrieved 28 July 2017.
  24. ↑ Statman-Weil Z. "Aedes communis: The Pollinating Mosquito". United States Forest Service . Retrieved 28 July 2017.
  25. ↑ Arnold S, Forbes S, Hall D, Farman D, Bridgemohan P, Spinelli G, et al. (2019). "Floral Odors and the Interaction between Pollinating Ceratopogonid Midges and Cacao". Journal of Chemical Ecology. 45 (10): 869–878. Bibcode:2019JCEco..45..869A. doi: 10.1007/s10886-019-01118-9 . PMID   31741191. S2CID   208086796.
  26. ↑ Scott-Brown A, Arnold S, Kite G, Farrell I, Collins D, Stevenson P (2019). "Mechanisms in mutualisms: A chemically mediated thrips pollination strategy in common elder". Planta. 250 (1): 367–379. Bibcode:2019Plant.250..367S. doi: 10.1007/s00425-019-03176-5 . PMID   31069523. S2CID   253886497.
  27. ↑ Mant JG, Schiestl FP, Peakall R, Weston PH (May 2002). "A phylogenetic study of pollinator conservatism among sexually deceptive orchids". Evolution; International Journal of Organic Evolution. 56 (5): 888–98. doi: 10.1111/j.0014-3820.2002.tb01402.x . PMID   12093025. S2CID   42724740.
  28. ↑ van Tussenbroek BI, Villamil N, Márquez-Guzmán J, Wong R, Monroy-Velázquez LV, Solis-Weiss V (September 2016). "Experimental evidence of pollination in marine flowers by invertebrate fauna". Nature Communications. 7 (1): 12980. Bibcode:2016NatCo...712980V. doi:10.1038/ncomms12980. PMC   5056424 . PMID   27680661.
  29. ↑ Roth A (28 July 2022). "Like Bees of the Seas, These Crustaceans Pollinate Seaweed". The New York Times. Retrieved 21 August 2022.
  30. ↑ Lavaut E, Guillemin ML, Colin S, Faure A, Coudret J, Destombe C, et al. (July 2022). "Pollinators of the sea: A discovery of animal-mediated fertilization in seaweed" (PDF). Science. 377 (6605): 528–530. Bibcode:2022Sci...377..528L. doi:10.1126/science.abo6661. PMID   35901149. S2CID   251159505.
  31. ↑ Stewart AB, Dudash MR (1 January 2018). "Foraging strategies of generalist and specialist Old World nectar bats in response to temporally variable floral resources". Biotropica. 50 (1): 98–105. Bibcode:2018Biotr..50...98S. doi:10.1111/btp.12492. S2CID   90515964.
  32. ↑ Olesen JM, Valido A (April 2003). "Lizards as pollinators and seed dispersers: an island phenomenon". Trends in Ecology & Evolution. 18 (4): 177–181. Bibcode:2003TEcoE..18..177O. doi:10.1016/S0169-5347(03)00004-1.]
  33. ↑ Baeckens S, Van Damme R (April 2020). "The island syndrome". Current Biology. 30 (8): R338–R339. Bibcode:2020CBio...30.R338B. doi: 10.1016/j.cub.2020.03.029 . PMID   32315628.
  34. 1 2 Kopec, K & Burd, L.A. (2017). "Pollinators in Peril: A systematic status review of North American and Hawaiian native bees." Center for Biological Diversity. See: https://www.biologicaldiversity.org/campaigns/native_pollinators/pdfs/Pollinators_in_Peril.pdf
  35. ↑ Alaux C, Ducloz F, Crauser D, Le Conte Y (23 August 2010). "Diet effects on honeybee immunocompetence". Biology Letters. 6 (4): 562–565. doi:10.1098/rsbl.2009.0986. ISSN   1744-9561. PMC   2936196 . PMID   20089536.
  36. ↑ Requier F, Leonhardt SD (February 2020). "Beyond flowers: including non-floral resources in bee conservation schemes". Journal of Insect Conservation. 24 (1): 5–16. doi:10.1007/s10841-019-00206-1. ISSN   1366-638X. S2CID   254600870.
  37. ↑ "Predicting the collapse of pollinators". News - Communications. New Zealand: University of Canterbury. 23 March 2012. Archived from the original on 24 November 2012. Retrieved 2 April 2012.
  38. ↑ Rodger JG, Bennett JM, Razanajatovo M, Knight TM, van Kleunen M, Ashman TL, et al. (15 October 2021). "Widespread vulnerability of flowering plant seed production to pollinator declines". Science Advances. 7 (42): eabd3524. Bibcode:2021SciA....7.3524R. doi:10.1126/sciadv.abd3524. ISSN   2375-2548. PMC   8514087 . PMID   34644118.
  39. ↑ Carrington D (9 January 2023). "Global pollinator losses causing 500,000 early deaths a year – study". the Guardian. Retrieved 9 January 2023.
  40. ↑ Smith MR, Mueller ND, Springmann M, Sulser TB, Garibaldi LA, Gerber J, et al. (December 2022). "Pollinator Deficits, Food Consumption, and Consequences for Human Health: A Modeling Study". Environmental Health Perspectives. 130 (12): 127003. doi:10.1289/EHP10947. PMC   9749483 . PMID   36515549.
  41. ↑ Wood TJ, Goulson D (7 June 2017). "The environmental risks of neonicotinoid pesticides: a review of the evidence post 2013". Environmental Science and Pollution Research. 24 (21): 17285–17325. Bibcode:2017ESPR...2417285W. doi:10.1007/s11356-017-9240-x. ISSN   0944-1344. PMC   5533829 . PMID   28593544.
  42. ↑ City MA, Us K6. "Tallgrass Prairie National Preserve (U.S. National Park Service)". www.nps.gov. Retrieved 22 February 2023.{{cite web}}: CS1 maint: numeric names: authors list (link)
  43. ↑ Obama PB (20 June 2014). "Presidential Memorandum – Creating a Federal Strategy to Promote the Health of Honey Bees and Other Pollinators". Office of the Press Secretary. Washington, D.C.: The White House . Retrieved 5 February 2018.
  44. 1 2 3 Pollinator Health Task Force (19 May 2015). "National Strategy to Promote the Health of Honey Bees and Other Pollinators" (PDF). Washington, D.C.: The White House . Retrieved 2 May 2018.
  45. 1 2 3 4 EP News Wire Reports (19 May 2015). "New U.S. pollinator strategy emphasizes science, industry collaboration". EPNewswire. Archived from the original on 30 September 2015. Retrieved 5 January 2024.
  46. ↑ Pollinator Health Task Force (19 May 2015). "Pollinator Research Action Plan" (PDF). Washington, D.C.: The White House. pp. 1–3. Retrieved 5 January 2024.
  47. ↑ Pollinator Health Task Force (22 June 2016). "Pollinator Partnership Action Plan" (PDF). Washington, D.C.: The White House . Retrieved 5 January 2024.
  48. ↑ "NAPPC". Pollinator.org. Retrieved 5 January 2024.
  49. ↑ "Pollinators". European Commission. Retrieved 20 February 2023.
  50. ↑ "Salud Apicola 2020". Salud Apicola 2020. Retrieved 22 February 2023.
  51. ↑ "Home | Promote Pollinators". promotepollinators.org. Retrieved 21 February 2023.
  52. ↑ Bascompte J, Jordano P, Melián CJ, Olesen JM (August 2003). "The nested assembly of plant-animal mutualistic networks". Proceedings of the National Academy of Sciences of the United States of America. 100 (16): 9383–7. Bibcode:2003PNAS..100.9383B. doi: 10.1073/pnas.1633576100 . PMC   170927 . PMID   12881488.
  53. ↑ Bastolla U, Fortuna MA, Pascual-García A, Ferrera A, Luque B, Bascompte J (April 2009). "The architecture of mutualistic networks minimizes competition and increases biodiversity". Nature. 458 (7241): 1018–20. Bibcode:2009Natur.458.1018B. doi:10.1038/nature07950. PMID   19396144. S2CID   4395634.
  54. 1 2 3 Lever JJ, van Nes EH, Scheffer M, Bascompte J (March 2014). "The sudden collapse of pollinator communities". Ecology Letters. 17 (3): 350–9. Bibcode:2014EcolL..17..350L. doi:10.1111/ele.12236. hdl: 10261/91808 . PMID   24386999.

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