Flour beetle

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Flour beetles
Tribolium castaneum87-300.jpg
Tribolium castaneum
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Infraorder: Cucujiformia
Superfamily: Tenebrionoidea
Family: Tenebrionidae
Genera

Aphanotus
Gnatocerus
Latheticus
Palorus
Tenebrio
Tribolium

Contents

Flour beetles are members of several darkling beetle genera including Tribolium and Tenebrio . They are pests of cereal silos and are widely used as laboratory animals, as they are easy to keep. The flour beetles consume wheat and other grains, are adapted to survive in very dry environments, and can withstand even higher amounts of radiation than cockroaches. [1] They are a major pest in the agricultural industry and are highly resistant to insecticides.[ dubious ]

Red flour beetles infest multiple different types of products such as grains, cereals, spices, seeds, and even cake mixes. They are also very susceptible to insecticides, which makes their damage very impactful on the economy of milling industries. [2]  

The larvae of T. molitor, when full-grown, are known as mealworms; small specimens and the larvae of the other species are called mini mealworms.

Female reproduction is distributed over their adult life-span which lasts about a year. Flour beetles also display pre-mating discrimination among potential mates. Female flour beetles, specifically of T. castaneum, can mate with different males and may choose more attractive males over the course of their adult life-span. [3]

Description

Flour beetles are a reddish-brown, oval-shaped insect. They have clubbed antennae on their head. They range from around 1/8 to 3/16 inch. Tribolium castaneum, more commonly known as red flour beetles, are known to fly. Other species of flour beetles crawl. [4]

Selected species

Diet

Flour beetles consume a number of foods to survive. Flour beetles feed on many grain products, cereal, chocolate, and a number of powdered foods; including flour, spices, powdered milk mix, and pancake and cake mix. [5]

Flour beetles also consume their own kind and participate in cannibalism. However, it is not a biological characteristic. It is suggested that they partake in cannibalism considering it raises the fitness of flour beetles that are in a habitat of weak sustainability. Additionally, it is a form of parental care. Some species produce trophic eggs for their children to eat. Those that engage in cannibalism are normally adults or larvae that consume pupae or eggs. Eggs and pupae fall prey to the older flour beetles because they do not have defense mechanisms being so young. Furthermore, the eggs and pupae are easily digestible, making them susceptible to becoming prey. [6]

Distribution and habitat

In current day, Tribolium are more commonly found in stored food products. However, originally Tribolium lived under the bark of trees or in rotting wood. It is unknown of the exact time that flour beetles made the switch from bark to food products, but for as long as humans created grain piles, flour beetles have been using them as habitats. Tribolium confusum stem from Africa or Ethiopia. Tribolium castanuem originate in India. In present day, flour beetles are dispersed worldwide and do not reside in any specific country. [7]

Sexual selection and reproduction

Tribolium use chemical signals, more specifically a pheromone, 4,8-dimethyldecanal (DMD), to attract mates. DMD attracts both females and males. DMD is isolated from Tribolium castaneum, Tribolium confusum, Tribolium freemani, and Tribolium madens. Tribolium participate in ployandry and continually lay eggs. Female Tribolium employ cryptic choice and accept or reject male spermatophores. Females also adjust the amount of spermatophores they accept based on male phenotypes. More specifically, Tribolium casataneum females are more inclined to accept more spermatophores from male mates if they are reoccurring mates. [8]

Competition

An experiment done by Zane Holditch and Aaron D. Smith found that while there is competition among Tribolium species, the success of a species may depend on the timing of arrival and resources available. [9] Results demonstrate that when species were are simultaneously put together, Tribolium castaneum were competitively dominant. Tribolium castaneum grew larger populations than its competitors that were added later. Moreover, Tribolium castaneum thrived competitively from having early arrival in comparison to Tribolium confusum. [9]

Research

In 2008, the Tribolium castaneum genome was sequenced by the Tribolium Genome Sequencing Consortium. [10]

Triboilum are easy to use for research because they have a high growth rate and they thrive very well in a simple flour culture.

[11]

Evolutionary and ecological research

Tribolium beetles have contributed to research for a long period of time. [12]

Tribolium experiments demonstrate that a multitude of factors determine success in colonization for any population. Experiments show that frequency and size, genetic and demographic processes, and individuals' relative fitness play a role in the success of colonizing populations. [12]

Tribolium have also allowed researchers to gain a better understanding on the dynamics of population size. [12]

See also

Related Research Articles

<span class="mw-page-title-main">Mealworm</span> Species of darkling beetle, larval form

Mealworms are the larval form of the yellow mealworm beetle, Tenebrio molitor, a species of darkling beetle.

<span class="mw-page-title-main">Darkling beetle</span> Family of beetles

Darkling beetle is the common name for members of the beetle family Tenebrionidae, comprising over 20,000 species in a cosmopolitan distribution.

<span class="mw-page-title-main">Drugstore beetle</span> Species of beetle

The drugstore beetle, also known as the bread beetle, biscuit beetle, and misnamed as the biscuit weevil, is a tiny, brown beetle. It can be found infesting a wide variety of dried plant products, where it is among the most common non-weevils to be found. It is the only living member of the genus Stegobium. It belongs to the family Ptinidae, which also includes the deathwatch beetle and furniture beetle. A notable characteristic of this species is the symbiotic relationship the beetles have with the yeast they carry, which are transmitted from female to larvae through the oviduct.

<span class="mw-page-title-main">Indianmeal moth</span> Species of moth

The Indianmeal moth, also spelled Indian meal moth and Indian-meal moth, is a pyraloid moth of the family Pyralidae. Alternative common names are hanger-downers, weevil moth, pantry moth, flour moth or grain moth. The almond moth and the raisin moth are commonly confused with the Indian-meal moth due to similar food sources and appearance. The species was named for feeding on Indian meal or cornmeal, and does not occur natively in India. It is also not to be confused with the Mediterranean flour moth, another common pest of stored grains.

<i>Tenebrio obscurus</i> Species of beetle

Tenebrio obscurus, or the dark mealworm beetle, is a species of darkling beetle whose larvae are known as mini mealworms. These insects should not be confused with younger mealworms or with the confused flour beetle.

<span class="mw-page-title-main">Almond moth</span> Species of moth

The almond moth or tropical warehouse moth is a small, stored-product pest. Almond moths infest flour, bran, oats, and other grains, as well as dried fruits. It belongs to the family of snout moths (Pyralidae), and more specifically to the tribe Phycitini of the huge snout moth subfamily Phycitinae. This species may be confused with the related Indian mealmoth or the Mediterranean flour moth, which are also common pantry pests in the same subfamily.

<span class="mw-page-title-main">Mediterranean flour moth</span> Species of moth

The Mediterranean flour moth or mill moth is a moth of the family Pyralidae. It is a common pest of cereal grains, especially flour. This moth is found throughout the world, especially in countries with temperate climates. It prefers warm temperatures for more rapid development, but it can survive a wide range of temperatures.

<i>Lasioderma serricorne</i> Species of beetle


Lasioderma serricorne, more commonly referred to as the cigarette beetle, cigar beetle, or tobacco beetle, is a small beetle that shares a remarkable resemblance with the drugstore beetle and the common furniture beetle. The cigarette beetle, along with the drugstore and furniture beetles, all belong to the Ptinidae beetle family. The cigarette beetle can be distinguished from A. punctatum by its flatter thorax, whereas the A. punctatum boasts a humped thorax. The cigarette beetle can be further differentiated from S. paniceum with its uniformly serrated antennae composed of 11 segments, unlike the three-segmented antennae of S. paniceum. Additionally, L. serricorne has more shallow grooves in its elytra, or hardened wing covers, compared to the A. punctatum and S. paniceum’s deep grooving.

Home-stored product entomology is the study of insects that infest foodstuffs stored in the home. It deals with the prevention, detection and eradication of pests.

<span class="mw-page-title-main">Confused flour beetle</span> Species of beetle

The confused flour beetle, a type of darkling beetle known as a flour beetle, is a globally found, common pest insect known for attacking and infesting stored flour and grain. They are one of the most common and most destructive insect pests for grain and other food products stored in silos, warehouses, grocery stores, and homes. They engage in cannibalistic behaviors for population control and nutritional benefits. Tribolium confusum practices kin selection to improve individual fitness. Multiple chemicals have been used to manage their infestation, including pyrethin and fungal insecticides.

<span class="mw-page-title-main">Tenebrioninae</span> Subfamily of beetles

Tenebrioninae is the largest subfamily of the darkling beetles (Tenebrionidae), containing flour beetles, among others. Tenebrioninae contains more than 20 tribes.

<span class="mw-page-title-main">Red flour beetle</span> Species of beetle

The red flour beetle is a species of beetle in the family Tenebrionidae, the darkling beetles. The red flour beetle, and other closely related beetles like the Gnatocerus cornutus, are a worldwide pest of stored products, particularly food grains, and a model organism for ethological and food safety research.

<i>Tenebroides mauritanicus</i> Species of beetle

Tenebroides mauritanicus, commonly known as the cadelle, is a species of beetle in the family Trogossitidae. It is a common cosmopolitan pest in storehouses and granaries.

<span class="mw-page-title-main">Maize weevil</span> Species of beetle

The maize weevil, known in the United States as the greater rice weevil, is a species of beetle in the family Curculionidae. It can be found in numerous tropical areas around the world, and in the United States, and is a major pest of maize. This species attacks both standing crops and stored cereal products, including wheat, rice, sorghum, oats, barley, rye, buckwheat, peas, and cottonseed. The maize weevil also infests other types of stored, processed cereal products such as pasta, cassava, and various coarse, milled grains. It has even been known to attack fruit while in storage, such as apples.

<i>Anthrenocerus australis</i> Species of beetle

Anthrenocerus australis is a species of beetle belonging to the Dermestidae family. It is commonly known as the Australian carpet beetle and is one of the most researched of the thirty-one species in the Anthrenocerus genus. This is generally attributed to its prevalence throughout Australia and New Zealand and the negative economic and agricultural impact it has as a pest. It is the larvae that causes damage to products, not the adult beetle. The total life cycle of this insect is around three years, most of which is spent as a larva. Once the beetle reaches maturity, it only lives for between two and six weeks.

Acarophenacidae is a family of mites in the order Trombidiformes that are egg parasitoids and ectoparasites of beetles or thrips. It contains eight genera and around 40 species.

<i>Alphitobius diaperinus</i> Species of beetle

Alphitobius diaperinus is a species of beetle in the family Tenebrionidae, the darkling beetles. It is known commonly as the lesser mealworm and the litter beetle. It has a cosmopolitan distribution, occurring nearly worldwide. It is known widely as a pest insect of stored food grain products such as flour, and of poultry-rearing facilities and it is a vector of many kinds of animal pathogens. In larval form, it is an approved novel food in the European Union, and also used as animal feed.

<i>Tribolium</i> (beetle) Genus of beetles

Tribolium is a genus of flour beetles in the family Tenebrionidae. They are known by various common names including flour beetles, flour weevils, red weevils and bran bugs.

A storage pest is an insect or other animal that damages or destroys stored food or other stored valuable organic matter. Insects are a large proportion of storage pests with each type of crop having specific insects that gravitate towards them such as the genus Tribolium that consists of insects such as Tribolium castaneum or Tribolium confusum which damage flour crops primarily.

<span class="mw-page-title-main">Plastivore</span> Organism capable of degrading and metabolising plastic

A plastivore is an organism capable of degrading and metabolising plastic. While plastic is normally thought of as non-biodegradable, a variety of bacteria, fungi and insects have been found to degrade it.

References

  1. Tuncbilek, A.S.; Ayvaz, A.; Öztürk, F.; Kaplan, B. (2003). "Gamma radiation sensitivity of larvae and adults of the red flour beetle, Tribolium castaneum Herbst". Journal of Pest Science. 76 (5): 129–132. doi:10.1007/s10340-003-0002-9. S2CID   21344878.
  2. Yao, Jianxiu; Chen, Chengyu; Wu, Hua; Chang, Jing; Silver, Kristopher; Campbell, James F.; Arthur, Frank H.; Zhu, Kun Yan (2019-12-01). "Differential susceptibilities of two closely-related stored product pests, the red flour beetle (Tribolium castaneum) and the confused flour beetle (Tribolium confusum), to five selected insecticides". Journal of Stored Products Research. 84: 101524. doi: 10.1016/j.jspr.2019.101524 . ISSN   0022-474X.
  3. Fedina, Tatyana Y.; Lewis, Sara M. (21 April 2018). "An integrative view of sexual selection in Tribolium flour beetles". Biological Reviews. 83 (2): 151–171. doi:10.1111/j.1469-185X.2008.00037.x. PMID   18429767. S2CID   9074999.
  4. "Flour Beetles". extensionentomology.tamu.edu. Retrieved 2024-04-27.
  5. "Stored Product Pests Flour Beetles" (PDF). U.S. Army Public Health Command. Retrieved 27 April 2024.
  6. Alabi, Taofic; Michaud, J. P.; Arnaud, Ludovic; Haubruge, Eric (2008). "A comparative study of cannibalism and predation in seven species of flour beetle". Ecological Entomology. 33 (6): 716–726. doi:10.1111/j.1365-2311.2008.01020.x. hdl:2097/13515. ISSN   0307-6946.
  7. Dawson, Peter S. (1977). "Life History Strategy and Evolutionary History of Tribolium Flour Beetles". Evolution. 31 (1): 226–229. doi:10.2307/2407562. ISSN   0014-3820. JSTOR   2407562. PMID   28567733.
  8. Fedina, Tatyana Y.; Lewis, Sara M. (2008). "An integrative view of sexual selection in Tribolium flour beetles". Biological Reviews. 83 (2): 151–171. doi:10.1111/j.1469-185X.2008.00037.x. ISSN   1464-7931.
  9. 1 2 Holditch, Zane; Smith, Aaron D. (2020-07-09). "Priority determines Tribolium competitive outcome in a food-limited environment". PLOS ONE. 15 (7): e0235289. doi: 10.1371/journal.pone.0235289 . ISSN   1932-6203. PMC   7347400 . PMID   32645709.
  10. Schröder, R. (2008). "The genome of the model beetle and pest Tribolium castaneum". Nature. 452 (7190): 949–955. Bibcode:2008Natur.452..949R. doi: 10.1038/nature06784 . PMID   18362917.
  11. Shanholtzer, S.; Lumsden, A.S. K. McMahon (ed.). "Using Flour Beetles (Tribolium confusum) in Population Growth Studies. Tested Studies for Laboratory Teaching Proceedings of the 33rd Conference of the Association for Biology Laboratory Education (ABLE), 390 pages". www.ableweb.org.
  12. 1 2 3 Pointer, Michael D.; Gage, Matthew J. G.; Spurgin, Lewis G. (2021). "Tribolium beetles as a model system in evolution and ecology". Heredity. 126 (6): 869–883. doi:10.1038/s41437-021-00420-1. ISSN   1365-2540.