Ecological speciation

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Three-spined stickleback fish have been a frequently studied species in ecological speciation. Gasterosteus aculeatus.jpg
Three-spined stickleback fish have been a frequently studied species in ecological speciation.

Ecological speciation is a form of speciation arising from reproductive isolation that occurs due to an ecological factor that reduces or eliminates gene flow between two populations of a species. Ecological factors can include changes in the environmental conditions in which a species experiences, such as behavioral changes involving predation, predator avoidance, pollinator attraction, and foraging; as well as changes in mate choice due to sexual selection or communication systems. Ecologically-driven reproductive isolation under divergent natural selection leads to the formation of new species. This has been documented in many cases in nature and has been a major focus of research on speciation for the past few decades. [1] : 179 

Contents

Ecological speciation has been defined in various ways to identify it as distinct from nonecological forms of speciation. [2] The evolutionary biologist Dolph Schluter defines it as "the evolution of reproductive isolation between populations or subsets of a single population by adaptation to different environments or ecological niches", [3] while others believe natural selection is the driving force. [4] [5] [6] The key difference between ecological speciation and other kinds of speciation is that it is triggered by divergent natural selection among different habitats, as opposed to other kinds of speciation processes like random genetic drift, the fixation of incompatible mutations in populations experiencing similar selective pressures, or various forms of sexual selection not involving selection on ecologically relevant traits. Ecological speciation can occur either in allopatry, sympatry, or parapatry—the only requirement being that speciation occurs as a result of adaptation to different ecological or micro-ecological conditions. [6]

Ecological speciation can occur pre-zygotically (barriers to reproduction that occur before the formation of a zygote) or post-zygotically (barriers to reproduction that occur after the formation of a zygote). Examples of pre-zygotic isolation include habitat isolation, isolation via pollinator-pollination systems, and temporal isolation. Examples of post-zygotic isolation involve genetic incompatibilities of hybrids, low fitness hybrids, and sexual selection against hybrids.

Some debate exists over the framework concerning the delineation of whether a speciation event is ecological or nonecological. "The pervasive effect of selection suggests that adaptive evolution and speciation are inseparable, casting doubt on whether speciation is ever nonecological". [2] However, there are numerous examples of closely related, ecologically similar species (e.g., Albinaria land snails on islands in the Mediterranean, [7] Batrachoseps salamanders from California, [8] and certain crickets [9] and damselflies [10] ), which is a pattern consistent with the possibility of nonecological speciation. [8] [11]

Ecological causes of divergent selection

Divergent selection is key to the occurrence of ecological speciation. Three ecological causes of divergent selection have been identified: differences in environmental conditions, ecological interactions, and sexual selection. The causes are following list [12] [13] [4]

Two types of experimental tests of ecological speciation caused by divergent environments. Experiment 1: a speciation event predicted to have occurred due to an ecologically-based divergent factor giving rise to two new species (1a). The experiment produces viable and fertile hybrid offspring and places them in isolated settings that match their parental environments (1b). The experiment predicts that, "reproductive isolation should then evolve in correlation with environment, building [increasing] between populations in different environments and being absent between laboratory and natural populations from similar environments." Experiment 2: a peripatric speciation event between a mainland species and an isolated endemic population occurs (2a). A laboratory setting replicates the mainland environmental conditions thought to have driven speciation and a mainland population is placed within it. The experiment predicts that the transplant will show evidence of isolation that matches that of the island endemic (2b). Hypothetical experimental tests for ecological speciation from environmental differences.svg
Two types of experimental tests of ecological speciation caused by divergent environments.
Experiment 1: a speciation event predicted to have occurred due to an ecologically-based divergent factor giving rise to two new species (1a). The experiment produces viable and fertile hybrid offspring and places them in isolated settings that match their parental environments (1b). The experiment predicts that, "reproductive isolation should then evolve in correlation with environment, building [increasing] between populations in different environments and being absent between laboratory and natural populations from similar environments."
Experiment 2: a peripatric speciation event between a mainland species and an isolated endemic population occurs (2a). A laboratory setting replicates the mainland environmental conditions thought to have driven speciation and a mainland population is placed within it. The experiment predicts that the transplant will show evidence of isolation that matches that of the island endemic (2b).
A summary of the various types of ecological isolation and its drivers. [4]
Reproductive isolation typePre-zygotic or post-zygoticEcological cause of selection
Divergent environmentsEcological interactionsSexual selectionReinforcement
HabitatPre✓✓✓
Sexual/PollinatorPre✓✓✓✓
TemporalPre✓✓✓
Selection against migrantsPre✓✓✓
Post-matingPre✓✓✓✓
Selection against hybridsPost✓✓✓✓
Ecologically-independentPost✓✓✓✓
Ecologically-dependentPost✓✓

Types of reproductive isolation

Habitat isolation

Micro-spatial and macro-spatial isolation differs by the feature of the habitat; whether it is patchy (such as fragmented forest interspersed with grassland) or a gradient (such as forest transitioning gradually into shrub or grassland. Ecological Speciation (habitat isolation) Schematic.svg
Micro-spatial and macro-spatial isolation differs by the feature of the habitat; whether it is patchy (such as fragmented forest interspersed with grassland) or a gradient (such as forest transitioning gradually into shrub or grassland.

Populations of a species can become spatially isolated due to preferences for separate habitats. [4] The separation decreases the chance of mating to occur between the two populations, inhibiting gene flow, and promoting pre-zygotic isolation to lead to complete speciation. [4] Habitat isolation is not equivalent to a geographic barrier like that of allopatric speciation. [1] : 182  Instead, it is based on genetic differences, where one species is unable to exploit a different environment, resulting from fitness advantages, fitness disadvantages, or resource competition. [1] : 182 

Jerry Coyne and H. Allen Orr posit two different forms of habitat isolation: microspatial habitat isolation (where matings between two species are reduced by preferences or adaptations to ecologically differing areas, despite occupying the same generalized area) and macrospatial habitat isolation (defined by fully allopatric habitats that inhibit gene flow.) [1] : 182–3  Identification of both forms of habitat isolation in nature is difficult due to the effects of geography. Measuring microspatial isolation demands several factors: [1] : 184 

Allopatric distributions pose several problems for detecting true habitat isolation in that different habitats of two allopatrically isolated species does not imply ecologically caused speciation. Alternative explanations could account for the patterns: [1] : 185 

These issues (with both micro- and macro-spatial isolation) can be overcome by field or laboratory experiments such as transplantation of individuals into opposite habitats [1] : 185  (though this can prove difficult if individuals are not completely unfit for the imposed habitat). [1] : 186  Habitat isolation can be measured for a species pair ( and ) during a breeding period by:

Here, is the proportion of encounters between matings that involve partners of a different species that are observed. is the proportion of total individuals of species . is the proportion of total individuals of species . The expected proportion of mating encounters between different species if mating is random is denoted by . A statistic of indicates no mating encounters of different species where indicates random mating of different species.

Geography

Ecological speciation caused by habitat isolation can occur in any geographic sense, that is, either allopatrically, parapatrically, or sympatrically. [4] Speciation arising by habitat isolation in allopatry (and parapatry) is straightforward in that reduced gene flow between two populations acquire adaptations that fit the ecological conditions of their habitat. The adaptations are reinforced by selection and, in many cases such as with animals, are reinforced by behavioral preferences (e.g. in birds that prefer specific vocalizations). [1] : 189  A classic example of habitat isolation occurring in allopatry is that of host-specific cospeciation [1] : 189  such as in the pocket gophers and their host chewing lice [24] or in the fig wasp-fig tree relationship and the yucca-yucca moth relationship—examples of ecological speciation caused by pollinator isolation. [1] : 189  In sympatry, the scenario is more complex, as gene flow may not be reduced enough to permit speciation. It is thought that selection for niche divergence can drive the process. In addition, if sympatry results from the secondary contact of two previously separated populations, the process of reinforcement, the selection against unfit hybrids between the two populations, may drive their complete speciation. Competition for resources may also play a role. [1] : 191 

The western American sagebrush Artemisia tridentata Sagebrushsjc.jpg
The western American sagebrush Artemisia tridentata

Habitat isolation is a significant impediment to gene flow and is exhibited by the common observation that plants and animals are often spatially separated in relation to their adaptations. [1] : 183  Numerous field studies, transplantation and removal experiments, and laboratory studies have been conducted to understand the nature of speciation caused by habitat isolation. [1] : 186–188  Horkelia fusca , for example, grows on California slopes and meadows above 4500 feet, where its closet relatives H. californica and H. cuneata grow below 3200 feet in coastal habitats. When species are transplanted to alternate habitats, their viability is reduced, indicating that gene flow between the populations is unlikely. [25] Similar patterns have been found with Artemisia tridentata tridentata and A. tridentata subsp. vaseyana in Utah, where hybrid zones exists between altitudinal populations, and transplant experiments reduce the fitness of the subspecies. [26]

Speciation by habitat isolation has also been studied in serpentine leaf miner flies, [27] ladybird beetles ( Epilachna ), [28] goldenrod gall flies, [29] Rhagoletis pomonella , [30] [31] leaf beetles, [32] and pea aphids. [33]

Sexual isolation

Ecological speciation due to sexual isolation results from differing environmental conditions that modify communication systems or mate choice patterns over time. [4] Examples abound in nature. [4] The coastal snail species Littorina saxatilis has been a focus of research [4] as two ecotypes residing at different shore levels exhibit reproductive isolation as a result of mate choice regarding the body size differences of the ecotype. [34] Both marine and freshwater stickleback fish have shown strong evidence of having speciated this way. [35] [36] [37] [38] Evidence is also found in Neochlamisus bebbianae leaf beetles, [32] Timema cristinae walking-stick insects, [39] [40] and in the butterfly species Heliconius melpomene and H. cydno which are thought to have diverged recently due to assortive mating being enhanced where the species populations meet in sympatry. [41]

Pollinator isolation

Angiosperms (flowering plants) require some form of pollination—many of which require another animal to transfer pollen from one flower to another. [42] Biotic pollination methods require pollinators such as insects (e.g. bees, butterflies, moths, wasps, beetles, and other invertebrates), [42] birds, bats, [43] and other vertebrate species. Because of this evolutionary relationship between pollinators and pollen-producing plants, plants and animals become mutually dependent on each other—the pollinator receives food in the form of nectar and the flower gains the ability to propagate its genes.

In the event that an animal uses a different pollination source, plants can become reproductively isolated. [1] : 193  Pollinator isolation is a specific form of sexual isolation. [4] The botanist Verne Grant distinguished between two types of pollinator isolation: mechanical isolation and ethological isolation. [1] : 193  [44] : 75 

Mechanical pollinator isolation

Pollen from each species Catasetum saccatum (I) and Catasetum discolor (II) attach to the dorsal and ventral parts of Eulaema cingulata (*) respectively. Eulaema cingulata with Catasetum saccatum and Catasetum discolor pollen atttachment locations.png
Pollen from each species Catasetum saccatum (I) and Catasetum discolor (II) attach to the dorsal and ventral parts of Eulaema cingulata (◊) respectively.

Mechanical isolation results from anatomical differences of a flower or pollinator preventing pollination from occurring. [44] For example, in the bee Eulaema cingulata, pollen from Catasetum discolor and C. saccatum is attached to different parts of the body (ventrally and dorsally respectively). [1] : 194  [45] Another example is with elephant's head and little elephant's head plants. They are not known to hybridize despite growing in the same region and being pollinated by the same bee species. Pollen is attached to different parts of the bee rendering the flowers isolated. [44] Mechanical isolation also includes pollinators who are unable to pollinate due to physical inabilities. [1] : 194  Nectar spur length, for example, could vary in size in a flower species resulting in pollination from different lepidopteran species due to the lengths preventing body contact with the flower's pollen.

Ethological pollinator isolation

Hypothetical flower visitation by various pollinators. Overlap exists, though some species are exclusive pollinators illustrating how pollinator isolation can be detected in natural or laboratory settings. Differential flower visitiation by pollinators - Graph.svg
Hypothetical flower visitation by various pollinators. Overlap exists, though some species are exclusive pollinators illustrating how pollinator isolation can be detected in natural or laboratory settings.

Ethological isolation is based on behavioral traits of pollinators that prefer different morphological characteristics of a flower either genetically or through learned behavior. These characteristics could be the overall shape and structure, color, type of nectar, or smell of the flower. [1] : 194  In some cases, mutualisms evolve between a pollinator and its host, cospeciating with near-congruent, parallel phylogenies. [1] : 196  That is, the dependent relationship results in closely identical evolutionary trees indicating that speciation events and the rate of speciation is identical. Examples are found in fig wasps and their fig hosts, with each fig wasp species pollinating a specific fig species. [46] The yucca and yucca moth exhibit this same pattern. [47]

Transition of hybrid forms between the white A. pubescens and the red-and-yellow A. formosa Aquilegia pubescens-formosa hybrid-swarm flowers close h.jpg
Transition of hybrid forms between the white A. pubescens and the red-and-yellow A. formosa
A hypothetical example of incipient speciation represented by differential geographic occurrence and nectar volume. The differing morphologies of the flower species results from selection towards traits that are more attractive to their available pollinators. The hummingbird has a greater affinity for red flowers and more nectar. The bee is attracted to purple flowers and demands less nectar. Hybrid flowers exist where ranges meet but are less attractive to pollinators thereby occurring less frequently. Flower color and nectar volume as a function of pollinator species ranges.svg
A hypothetical example of incipient speciation represented by differential geographic occurrence and nectar volume. The differing morphologies of the flower species results from selection towards traits that are more attractive to their available pollinators. The hummingbird has a greater affinity for red flowers and more nectar. The bee is attracted to purple flowers and demands less nectar. Hybrid flowers exist where ranges meet but are less attractive to pollinators thereby occurring less frequently.

In a striking case, two closely related flowering plants ( Erythranthe lewisii and E. cardinalis ) have speciated due to pollinator isolation in complete sympatry (speciation occurring without any physical, geographic isolation). [4] E. lewisii has changed significantly from its sister species in that its evolved pink flowers, broad petals, shorter stamens (the pollen-producing part of the plant), and a lower volume of nectar. It is entirely pollinated by bees with almost no crossing in nature. E. cardinalis is pollinated by hummingbirds and exhibits red, tube-shaped flowers, larger stamens, and a lot of nectar. It is thought that nectar volume as well as a genetic component (an allele substitution that controls color variation) maintains isolation. [48] [49] A similar pattern has been found in Aquilegia pubescens and A. formosa . In this species pair, A. pubescens is pollinated by hawkmoths while A. formosa is pollinated by hummingbirds. [1] : 197  Unlike in Erythranthe, these species reside in different habitats but exhibit hybrid forms where their habitats overlap; [50] though they remain separate species suggesting that the hybrid flowers may be less attractive to their pollinator hosts. [1] : 197 

Geography

Four geographic-based scenarios involving pollinator isolation are known to occur:

  • The most common framework for pollinator isolation in a geographic context implies that floral trait divergence occurs as a result of geographic isolation (allopatrically). From there, a population has the potential to encounter different pollinators ultimately resulting in selection favoring traits to attract the pollinators and achieve reproductive success. [1] : 198 
  • Another scenario involves an initial allopatric stage, wherein secondary contact occurs at a variable level of reproductive isolation—high isolation is effectively allopatric speciation whereas low isolation is effectively sympatric. [4] This "two-stage" model is indicated in the three-spined sticklebacks [51] as well as the apple maggot fly and its apple hosts. [52]
  • A pollinator can change preferences due to its own evolution driving selection to favor traits that align with the pollinators changed preferences. [1] : 198 
  • There exists the possibility that when two populations become isolated geographically, a plant or pollinator could go extinct in one of the populations driving selection to favor different traits. [53]
A species population of pink-petal flowers becomes isolated in allopatry or parapatry. Novel pollinators drive the selection of new traits (purple petals) in the isolated populations eventually leading to speciation of the flower populations. It is possible for the same pollinator to drive the selection of new flower traits as long as the proportions of pollinators differ enough. Ecological Speciation (pollinator isolation) Schematic-2.svg
A species population of pink-petal flowers becomes isolated in allopatry or parapatry. Novel pollinators drive the selection of new traits (purple petals) in the isolated populations eventually leading to speciation of the flower populations. It is possible for the same pollinator to drive the selection of new flower traits as long as the proportions of pollinators differ enough.

Jerry Coyne and H. Allen Orr contend that any scenario of pollinator isolation in allopatry demands that incipient stages should be found in different populations. This has been observed to varying degrees in several species-pollinator pairs. Flower size of Raphanus sativus (in this case, wild radish in 32 California populations) has been found to differ in accordance with larger honeybee pollinators. [54] Polemonium viscosum flowers have been found to increase in size along an alpine gradient in the Colorado Rocky Mountains as flies pollinate at the timberline whereas bumblebees pollinate at higher elevations. [55] A similar pattern involving the timing in which hawkmoths ( Hyles lineata ) are active is documented in three subspecies of Aquilegia coerulea , the Rocky Mountain columbine found across the western United States. [56]

The most notable example according to Coyne and Orr is that of the African orchid subspecies Satyrium hallackii hallackii and Satyrium hallackii ocellatum. [1] : 199–200  The latter is pollinated by moths and exhibits long nectar spurs that correlate with the moth's proboscis. Unlike the inland, grassland habitat of subspecies hallackii, ocellatum resides in coastal populations and has short spurs that correlate with its primary carpenter bee pollinator. The moths are unable to find suitable nest sites in coastal habitats while the bees are unable inland. This pattern separates the pollinator populations but does not separate the orchid population driving selection to favor flower differences that better-match the local pollinators. [57] A similar pattern has been detected in studies of the Disa draconis complex in South Africa. [58]

Temporal isolation (allochronic speciation)

Breeding seasons of three populations of a species shift over time eventually causing the isolation of their genes from the other populations. This reproductive isolation can lead to speciation. Allochronic speciation.svg
Breeding seasons of three populations of a species shift over time eventually causing the isolation of their genes from the other populations. This reproductive isolation can lead to speciation.

Temporal isolation is based on the reduction of gene flow between two populations due to different breeding times (phenology). It is also referred to as allochronic isolation, allochronic speciation, or allochrony. In plants, breeding in regards to time could involve the receptivity of stigma to accepting sperm, periods of pollen release (such as in conifer trees where cones disperse pollen via wind), or overall timing of flowering. In contrast, animals often have mating periods or seasons (and many aquatic animals have spawning times). [1] : 202  Migratory patterns have also been implicated in allochronic speciation. [59] [60] [61] : 92–96 

For allochronic speciation to be considered to have actually occurred, the model necessitates three major requirements: [62]

  1. Phylogenetic analysis indicates the incipient species are sister taxa
  2. Breeding timing is genetically-based (heritable to offspring)
  3. The source of divergence is explicitly allochrony and not the result of reinforcement or other mechanisms

Allochrony is thought to evolve more easily the greater the heritability of reproductive timing—that is, the greater the link between genes and the timing of reproduction—the more likely speciation will occur. [63] Temporal isolation is unique in that it can be explicitly sympatric as well as nongenetic; [1] : 203  however genetic factors must be involved for isolation to lead to complete reproductive isolation and subsequent speciation. Speciation by allochrony is known to occur in three time frames: yearly (e.g. periodic cicadas emerging over decades or multi-decadal bamboo flowerings), seasonal (organisms that breed during times of the year such as winter or summer), and daily (e.g. daily spawning times of corals). [62] The table list below summarizes a number of studies considered to be strong or compelling examples of allochronic speciation occurring in nature. [62]

Table of known or likely allochronic speciation events.
SpeciesDescription
Acropora spp.Japanese corals found to be reproductively isolated by the timing of their spawning. [64]
Montastraea annularis, M. faveolata, and M. franksi Three related species of coral that have speciated due to the timing of their spawning. [65]
Oncorhynchus nerka Yearly breeding runs of Sockeye salmon occur during two periods in the year (late and early) have caused genetic isolation of incipient populations. Salmon breeding is known to be genetic but no specific genes are known for this species. [66] [67] [68]
Thaumetopoea pityocampa Codominance in genes is associated with the emergence time for larval stages of this moth species. Winter and summer larval populations are in the process of speciating. [69] [70] [71]
Inurois punctigeraBreeding is prevented in areas where mid-winter temperatures are unsuitable for the moth species. This has given rise to late and early populations. [72]
Pemphigus populi-transversus and P. obesinymphaeThe gall-forming aphids produce galls on different leaves of the same host tree species. P. populi-transversus forms galls on early spring leaves while P. obesinymphae forms them on leaves in the summer. This has led to full reproductive isolation. [73]
Asphondylia spp.Three midge species infect the stems of Larrea tridentata , A. auripila in summer, A. resinosa in winter, and A. foliosa in spring. [74]
Acropora samoensis Sympatric species populations of coral spawn separately in the fall and spring with spawning being a heritable, likely involving the PaxC gene. [75]
Cellana spp.Inhabiting different depths within centimeters, the limpets have become reproductively isolated likely due to a combination of parapatric speciation and spawn cues (e.g. spawning according to water level. [76]
Hydrobates spp.The petrels group has reproductively isolated (in the Azores) and incipient species (other archipelagos) caused by cool and warm breeding seasons. [77] [78] [79]
Howea belmoreana and H. forsteriana Genetically controlled flowering times have caused (in conjunction with differing soil pH levels) the reproductive isolation of two palm species on Lord Howe Island. [80]
Erysiphe necator Exhibits evidence of isolation due to temporal differences of its host species Vitis vinifera . [81]
Oncorhynchus gorbuscha Even and odd two-year life cycles in conjunction with seasonal breeding runs of pink salmon has driven genetic differentiation between the two populations. [82] [83] [84]
Magicicada spp.Groups of 13- and 17-year life cycle species pairs (seven species total) of cicada emerge to reproduce separated by large time frames between breading seasons. [85] [86] [87] Only every 221 years do the 13 and 17 year cycles align where both pairs emerge simultaneously. [62]
Antitrogus parvulus Two beetle cohorts express genetic differentiation from life cycles separated by two-year intervals. [88]
Oeneis melissa semideaTwo-year life cycles of the butterfly species breeding groups have caused genetic differentiation. [89]
Bambusoideae Bamboo undergo semelparous reproduction where they live for years before mass-flowering at once. This can happen in different years and different locations. Allochronic patches are thought to have driven the diversification of global bamboo species. [90] [91] [92]

Other pre-zygotic forms of ecological isolation

Selection against migrants, or immigrant inviability, is hypothesized to be a form of ecological isolation. This type of speciation involves the low survival rates of migrants between populations because of their lack of adaptations to non-native habitats. [4] There is little understanding the relationship between post-mating, pre-zygotic isolation and ecology. [4] Post-mating isolation occurs between the process of copulation (or pollination) and fertilization—also known as gametic isolation. [1] : 232  Some studies involving gametic isolation in Drosophila fruit flies, [93] ground crickets, [94] and Helianthus plants [95] suggest that there may be a role in ecology; however it is undetermined. [4]

Post-zygotic forms of ecological isolation

Three forms of ecologically-based post-zygotic isolation: 1. Ecologically-independent post-zygotic isolation. 2. Ecologically-dependent post-zygotic isolation. 3. Selection against hybrids. Post-Zygotic Ecological Isolation.svg
Three forms of ecologically-based post-zygotic isolation:
1. Ecologically-independent post-zygotic isolation.
2. Ecologically-dependent post-zygotic isolation.
3. Selection against hybrids.

Ecologically-independent post-zygotic isolation arises out of genetic incompatibilities between two hybrid individuals of a species. [96] It is thought that in some cases, hybrids have lower fitness especially based on the environment in which they reside. [96] For example, in extreme environments with limited ecological niches to exploit, high fitness is necessitated, whereas if an environment has lots of niches, lower fit individuals may be able to survive for longer. Some studies indicate that these incompatibilities are a cause of ecological speciation because they can evolve quickly through divergent selection. [4]

Ecologically-dependent post-zygotic isolation results from the reduce hybrid of fitness due to its position in an ecological niche [4] —that is, parental species occupy slightly different niches, but their hybrid offspring end up requiring a niche that is a blend between the two of which does not typically exist (in regard to a fitness landscape). This has been detected in populations of sticklebacks ( Gasterosteus aculeatus ), [97] [98] water-lily beetles ( Galerucella nymphaeae ), [99] pea aphids, [100] and tephritid flies ( Eurosta solidaginis ). [101]

Selection against hybrids can sometimes (it is possible that nonecological speciation can be attributed) be considered a form of ecological isolation if it originates from an ecological mechanism. [4] For example, the hybrid offspring may be seen as "less attractive" to mates due to intermediate sexual displays or differences in sexual communication. The end result is that the genes of each parental population are unable to intermix as they are carried by a hybrid who is unlikely to reproduce. This pattern of sexual selection against hybrid offspring has been found in Heliconius butterflies. [4] The two species H. cydno and H. melpomene are distributed sympatrically in South America and hybridize infrequently. [102] When they do hybridize, the species shows strong assortive mating due to the mimicry-evolved color pattern that hybrid offspring have an intermediate of. [102] Similar patterns have been found in lacewings [103] migrating patterns of Sylvia atricapilla bird populations, [104] wolf spiders ( Schizocosa ocreata and S. rovneri ) and their courtship behaviors, [105] sympatric benthic and limnetic sticklebacks (the Gasterosteus aculeatus complex), [106] and the Panamanian butterflies Anartia fatima and A. amathea . [107] Flowers involving pollinator discrimination against hybrids have shown this pattern as well, in monkey flowers (Erythranthe lewisii and Erythranthe cardinalis) [108] and in two species of the Louisiana iris group, Iris fulva and I. hexagona . [109]

See also

Related Research Articles

Speciation is the evolutionary process by which populations evolve to become distinct species. The biologist Orator F. Cook coined the term in 1906 for cladogenesis, the splitting of lineages, as opposed to anagenesis, phyletic evolution within lineages. Charles Darwin was the first to describe the role of natural selection in speciation in his 1859 book On the Origin of Species. He also identified sexual selection as a likely mechanism, but found it problematic.

Allopatric speciation – also referred to as geographic speciation, vicariant speciation, or its earlier name the dumbbell model – is a mode of speciation that occurs when biological populations become geographically isolated from each other to an extent that prevents or interferes with gene flow.

<span class="mw-page-title-main">Sympatric speciation</span> Evolution of a new species from an ancestor in the same location

In evolutionary biology, sympatric speciation is the evolution of a new species from a surviving ancestral species while both continue to inhabit the same geographic region. In evolutionary biology and biogeography, sympatric and sympatry are terms referring to organisms whose ranges overlap so that they occur together at least in some places. If these organisms are closely related, such a distribution may be the result of sympatric speciation. Etymologically, sympatry is derived from Greek συν (sun-) 'together', and πατρίς (patrís) 'fatherland'. The term was coined by Edward Bagnall Poulton in 1904, who explains the derivation.

<span class="mw-page-title-main">Peripatric speciation</span> Speciation in which a new species is formed from an isolated smaller peripheral population

Peripatric speciation is a mode of speciation in which a new species is formed from an isolated peripheral population. Since peripatric speciation resembles allopatric speciation, in that populations are isolated and prevented from exchanging genes, it can often be difficult to distinguish between them. Nevertheless, the primary characteristic of peripatric speciation proposes that one of the populations is much smaller than the other. The terms peripatric and peripatry are often used in biogeography, referring to organisms whose ranges are closely adjacent but do not overlap, being separated where these organisms do not occur—for example on an oceanic island compared to the mainland. Such organisms are usually closely related ; their distribution being the result of peripatric speciation.

<span class="mw-page-title-main">Sympatry</span> Biological concept

In biology, two related species or populations are considered sympatric when they exist in the same geographic area and thus frequently encounter one another. An initially interbreeding population that splits into two or more distinct species sharing a common range exemplifies sympatric speciation. Such speciation may be a product of reproductive isolation – which prevents hybrid offspring from being viable or able to reproduce, thereby reducing gene flow – that results in genetic divergence. Sympatric speciation may, but need not, arise through secondary contact, which refers to speciation or divergence in allopatry followed by range expansions leading to an area of sympatry. Sympatric species or taxa in secondary contact may or may not interbreed.

<span class="mw-page-title-main">Disruptive selection</span> Natural selection for extreme trait values over intermediate ones

In evolutionary biology, disruptive selection, also called diversifying selection, describes changes in population genetics in which extreme values for a trait are favored over intermediate values. In this case, the variance of the trait increases and the population is divided into two distinct groups. In this more individuals acquire peripheral character value at both ends of the distribution curve.

<span class="mw-page-title-main">Character displacement</span>

Character displacement is the phenomenon where differences among similar species whose distributions overlap geographically are accentuated in regions where the species co-occur, but are minimized or lost where the species' distributions do not overlap. This pattern results from evolutionary change driven by biological competition among species for a limited resource. The rationale for character displacement stems from the competitive exclusion principle, also called Gause's Law, which contends that to coexist in a stable environment two competing species must differ in their respective ecological niche; without differentiation, one species will eliminate or exclude the other through competition.

<span class="mw-page-title-main">Parapatric speciation</span> Speciation within a population where subpopulations are reproductively isolated

In parapatric speciation, two subpopulations of a species evolve reproductive isolation from one another while continuing to exchange genes. This mode of speciation has three distinguishing characteristics: 1) mating occurs non-randomly, 2) gene flow occurs unequally, and 3) populations exist in either continuous or discontinuous geographic ranges. This distribution pattern may be the result of unequal dispersal, incomplete geographical barriers, or divergent expressions of behavior, among other things. Parapatric speciation predicts that hybrid zones will often exist at the junction between the two populations.

<span class="mw-page-title-main">Hybrid zone</span> Population genetics term

A hybrid zone exists where the ranges of two interbreeding species or diverged intraspecific lineages meet and cross-fertilize. Hybrid zones can form in situ due to the evolution of a new lineage but generally they result from secondary contact of the parental forms after a period of geographic isolation, which allowed their differentiation. Hybrid zones are useful in studying the genetics of speciation as they can provide natural examples of differentiation and gene flow between populations that are at some point on the continuum between diverging populations and separate species with reproductive isolation.

The mechanisms of reproductive isolation are a collection of evolutionary mechanisms, behaviors and physiological processes critical for speciation. They prevent members of different species from producing offspring, or ensure that any offspring are sterile. These barriers maintain the integrity of a species by reducing gene flow between related species.

A genetic isolate is a population of organisms that has little to no genetic mixing with other organisms of the same species due to geographic isolation or other factors that prevent reproduction. Genetic isolates form new species through an evolutionary process known as speciation. All modern species diversity is a product of genetic isolates and evolution.

Flowering synchrony is the amount of overlap between flowering periods of plants in their mating season compared to what would be expected to occur randomly under given environmental conditions. A population which is flowering synchronously has more plants flowering at the same time than would be expected to occur randomly. A population which is flowering asynchronously has fewer plants flowering at the same time than would be expected randomly. Flowering synchrony can describe synchrony of flowering periods within a year, across years, and across species in a community. There are fitness benefits and disadvantages to synchronized flowering, and it is a widespread phenomenon across pollination syndromes.

<span class="mw-page-title-main">Harlan Lewis</span> American botanist

Frank Harlan Lewis was an American botanist, geneticist, taxonomist, systematist, and evolutionist who worked primarily with plants in the genus Clarkia. He is best known for his theories of "catastrophic selection" and "saltational speciation", which are closely aligned with the concepts of quantum evolution and sympatric speciation. The concepts were first articulated in 1958 by Lewis and Peter H. Raven, and later refined in a 1962 paper by Lewis in which he coined the term "catastrophic selection". In 1966, he referred to the same mechanism as "saltational speciation".

<span class="mw-page-title-main">Reinforcement (speciation)</span> Process of increasing reproductive isolation

Reinforcement is a process of speciation where natural selection increases the reproductive isolation between two populations of species. This occurs as a result of selection acting against the production of hybrid individuals of low fitness. The idea was originally developed by Alfred Russel Wallace and is sometimes referred to as the Wallace effect. The modern concept of reinforcement originates from Theodosius Dobzhansky. He envisioned a species separated allopatrically, where during secondary contact the two populations mate, producing hybrids with lower fitness. Natural selection results from the hybrid's inability to produce viable offspring; thus members of one species who do not mate with members of the other have greater reproductive success. This favors the evolution of greater prezygotic isolation. Reinforcement is one of the few cases in which selection can favor an increase in prezygotic isolation, influencing the process of speciation directly. This aspect has been particularly appealing among evolutionary biologists.

<span class="mw-page-title-main">History of speciation</span>

The scientific study of speciation — how species evolve to become new species — began around the time of Charles Darwin in the middle of the 19th century. Many naturalists at the time recognized the relationship between biogeography and the evolution of species. The 20th century saw the growth of the field of speciation, with major contributors such as Ernst Mayr researching and documenting species' geographic patterns and relationships. The field grew in prominence with the modern evolutionary synthesis in the early part of that century. Since then, research on speciation has expanded immensely.

<span class="mw-page-title-main">Evidence for speciation by reinforcement</span> Overview article

Reinforcement is a process within speciation where natural selection increases the reproductive isolation between two populations of species by reducing the production of hybrids. Evidence for speciation by reinforcement has been gathered since the 1990s, and along with data from comparative studies and laboratory experiments, has overcome many of the objections to the theory. Differences in behavior or biology that inhibit formation of hybrid zygotes are termed prezygotic isolation. Reinforcement can be shown to be occurring by measuring the strength of prezygotic isolation in a sympatric population in comparison to an allopatric population of the same species. Comparative studies of this allow for determining large-scale patterns in nature across various taxa. Mating patterns in hybrid zones can also be used to detect reinforcement. Reproductive character displacement is seen as a result of reinforcement, so many of the cases in nature express this pattern in sympatry. Reinforcement's prevalence is unknown, but the patterns of reproductive character displacement are found across numerous taxa, and is considered to be a common occurrence in nature. Studies of reinforcement in nature often prove difficult, as alternative explanations for the detected patterns can be asserted. Nevertheless, empirical evidence exists for reinforcement occurring across various taxa and its role in precipitating speciation is conclusive.

<span class="mw-page-title-main">Laboratory experiments of speciation</span> Biological experiments

Laboratory experiments of speciation have been conducted for all four modes of speciation: allopatric, peripatric, parapatric, and sympatric; and various other processes involving speciation: hybridization, reinforcement, founder effects, among others. Most of the experiments have been done on flies, in particular Drosophila fruit flies. However, more recent studies have tested yeasts, fungi, and even viruses.

Eukaryote hybrid genomes result from interspecific hybridization, where closely related species mate and produce offspring with admixed genomes. The advent of large-scale genomic sequencing has shown that hybridization is common, and that it may represent an important source of novel variation. Although most interspecific hybrids are sterile or less fit than their parents, some may survive and reproduce, enabling the transfer of adaptive variants across the species boundary, and even result in the formation of novel evolutionary lineages. There are two main variants of hybrid species genomes: allopolyploid, which have one full chromosome set from each parent species, and homoploid, which are a mosaic of the parent species genomes with no increase in chromosome number.

Allochronic speciation is a form of speciation arising from reproductive isolation that occurs due to a change in breeding time that reduces or eliminates gene flow between two populations of a species. The term allochrony is used to describe the general ecological phenomenon of the differences in phenology that arise between two or more species—speciation caused by allochrony is effectively allochronic speciation.

In biology, parallel speciation is a type of speciation where there is repeated evolution of reproductively isolating traits via the same mechanisms occurring between separate yet closely related species inhabiting different environments. This leads to a circumstance where independently evolved lineages have developed reproductive isolation from their ancestral lineage, but not from other independent lineages that inhabit similar environments. In order for parallel speciation to be confirmed, there is a set of three requirements that has been established that must be met: there must be phylogenetic independence between the separate populations inhabiting similar environments to ensure that the traits responsible for reproductive isolation evolved separately, there must be reproductive isolation not only between the ancestral population and the descendent population, but also between descendent populations that inhabit dissimilar environments, and descendent populations that inhabit similar environments must not be reproductively isolated from one another. To determine if natural selection specifically is the cause of parallel speciation, a fourth requirement has been established that includes identifying and testing an adaptive mechanism, which eliminates the possibility of a genetic factor such as polyploidy being the responsible agent.

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