Lasioglossum hemichalceum

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Lasioglossum hemichalceum
Lasioglossum hemichalceum.jpeg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Halictidae
Tribe: Halictini
Genus: Lasioglossum
Species:
L. hemichalceum
Binomial name
Lasioglossum hemichalceum
(Cockerell, 1923)

Lasioglossum hemichalceum, which has sometimes been confused with L. erythrurum, [1] is a sweat bee endemic to Australia. [2] Large numbers of unrelated females will typically share a single nest, a behavior referred to as "communal". [3] Nests are constructed underground by the independent efforts of the females. [4] L. hemichalceum will typically begin creating new colonies during the summer, [5] with brood production from late November through the first few months of spring. [6] Members of this species do not demonstrate aggressive behavior towards one another. [7] As the size of the colony increases, the reproductive potential of each female does not change, unlike many species of bees. [5]

Contents

Taxonomy and phylogeny

Lasioglossum hemichalceum is part of the genus Lasioglossum, subgenus Chilalictus. [8] Other species within this genus include Lasioglossum malachurum , Lasioglossum zephyrus and Lasioglossum clarum . [9] Lasioglossum species which occupy parts of Africa and central Europe demonstrate varying types of social behavior—ranging from solitary to communal and even semi-social. [9] L. hemichalceum is in the company of nearly 150 other species that fall within the subgenus Chilalictus, all native to Australia. [9]

Description and identification

Preserved full body specimen of Lasioglossum hemichalceum Lasioglossum hemichalceum (full body image).jpeg
Preserved full body specimen of Lasioglossum hemichalceum

Morphology

Lasioglossum hemichalceum can be identified by its medium long antennas, often off-white in color, and triangular head. [10] While many are dull black in color, they may display hints of purple, green, or copper. [10] Males typically have thinner bodies than females and also have less hair on their hind legs for carrying pollen. [10] Females usually range from 4.7–5 mm in length, and have wider heads than males (being about 1.5–1.6 mm in width). [10] Typical males have slightly shorter body lengths, and heads that are more narrow in length (approximately 3.8–4.7 mm in length, and 1.3–1.5 mm in width). [10] In addition, the legs of L. hemichalceum tend to be dark brown or black in color, although there have been instances of red-brown pigmentation. [10] In terms of coloring, there are not significant differences between females and males. [10] Furthermore, because L. hemichalceum is a communal species, there are not queens who are distinguishable from workers—almost all females are the same in appearance. [10]

Male dimorphism

There are two morphs of male Lasioglossum hemichalceum: those with typical proportions and small in size, or those referred to as macrocephalic. [6] Macrocephalic morphology is characterized by a disproportionately large head and mandibles. [6] Macrocephalic males have wider heads than both females and small males and also have a heavier weight when they are pupae than most female pupae. [6] Small males typically live away from the nest, while macrocephalic males remain inside. [6]

Nest

Female Lasioglossum hemichalceum build their nests underground. [11] They will construct burrows and carry the dirt that was removed to the surface. [11] At colony initiation, the females will construct a large number of tunnels; however, as females get ready to overwinter, they will participate less and less in nest construction. [11] They also do not coordinate with one another when constructing the tunnels, but do so independently of one another. [11]

Distribution and habitat

L. hemichalceum is endemic to specific regions of Australia. [12] L. hemichalceum can be found in New South Wales, Victoria, and Queensland. [12] Their environment in southern Australia is one that has wet winters that are fairly mild and summers that are warm and dry. [13] Nests are not frequently built above ground and are typically constructed by separate groups of egg-laying females. [14]

Colony cycle

Colony initiation

Colony initiation starts late in the month of November and typically ends in the early spring, around February or April, after females have overwintered. [6] The individual members of the group have two options in terms of where they would like to initiate a new colony. Their first option is to find depressions in soft ground that are appropriate for building a nest [5] and build a new nest in accordance with the description above. However, they may also choose to re-use the nest from the year before, which happens about 40% of the time. [15] In certain cases, members may even choose to add on to old nests so that a mixture of both old and new nests are created. [15] New nests will be created regardless of whether or not there are other colonies who are occupying the same nest. [5] This process of initiation is conducted sequentially, in which one female will start digging and other females will join her (this number is variable). [4] The number of total bees that inhabit the nest will typically reach over 100, with a larger percentage of females than males. [5] However, it is important to note that these females are also unrelated, which is different from other communal and eusocial species. [14]

Colony growth and decline

During this time, the reproductive females will raise two separate generations of broods, one that is reared by the mother, and the second which is reared by both surviving mothers and their daughters (which originated from the first brood). [6] However, the number of broods that are initiated depends on climate conditions. [5] For example, if it is rainy rather than dry, only one brood will be raised rather than two (which is more typical). [5] Furthermore, if new nests are created, it typically happens between the first and second brood initiations. [15] In this way, the colony initiation cycle and nesting cycle are in rotation with one another. [15] Once the eggs have been laid, the egg-laying females will construct individual brood cells, each with a certain amount of nectar and pollen. [6] This pollen is rolled into a small ball, and the egg is laid on top of the ball before the cell is sealed. [6] Differences in the size of these pollen balls (which are the only food that is provided to the growing larvae) is thought to contribute to differences in weight for adults. [6] The pupal stage lasts 18 days alone, however the full cycle spans approximately 6 weeks. [6] Colony decline happens during the summer months between the end of egg production and overwintering. [14] However, because the females of L. hemichalceum migrate between different nests, more than one nest exists at a time. [5]

Behavior

Communal behavior

Lasioglossum hemichalceum demonstrates behavior typical for a communal species. [14] This means that females will occupy the same nest but care for their own brood, and they all have the capacity to reproduce. [14] They often have colonies that are small in size, and relatively well concealed. [14] Females of L. hemichalceum will share nectar with one another via trophallaxis. [5] They also demonstrate remarkably cooperative behavior towards each other even though the majority of the colony members are not related. [14] This has demonstrated that interactions between group members are not restricted to kin, and that L. hemichalceum tend to differ from solitary or eusocial species. [7] Unlike most communal species of bees, L. hemichalceum do not occupy nests over the course of multiple generations, however they may re-use a nest at some point in their life cycle. [14]

Dominance hierarchy

Because L. hemichalceum is a communal species, it displays egalitarian behavior. [7] This means that females do not display a distinct division of labor or hierarchy. [7] All individual females are also able to reproduce, which is probably related to the highly cooperative behavior and egalitarian behaviors that these bees display. [7] In accordance with their lack of hierarchy, females rarely display threatening behaviors and do not discriminate in terms of genetic relatedness for these threatening behaviors. [7] Thus, agonistic displays are not directed towards individuals based on their familiarity as nestmates or relatives. [7] This egalitarian system stands in contrast to that of L. zephyrus and other eusocial halictines with division of labor. [7]

Mating behavior

L. hemichalceum displays different mating behaviors for different morphologies. [6] Males who are born with the typical small body morphology mate away from the nest. [6] This contributes to outbreeding and makes the genetic pool much more diverse. [5] However, males that display the macrocephalic body morphology will remain in the nest and mate with females there. [6] In order to mate with resident females, macrocephalic males will fight each other until they are severely injured, and even kill each other. [6] Because macrocephalic males are able to mate with several females, their offspring will be genetically related, thus, the females migrate away from their natal nests in order to reduce intra-colony relatedness. [5] Females will typically overwinter and will not start reproducing until the months of the spring season. [6] Some seasons are worse than others in terms of food availability and predation, so some females will decide to stay and mate in the colony rather than leave, although this is less typical behavior for adult females. [6] If a female needs to exit the nest to obtain nectar or pollen, it is sometimes better to take advantage of this opportunity and mate outside the colony. [6]

Kin selection

Genetic relatedness

Genetic relatedness among colonies of L. hemichalceum differs depending on the type of relationship. [3] Because L. hemichalceum is a communal species, there are not queen-worker dynamics that can be identified in terms of genetic relatedness. [3] Genetic relatedness is determined by using mean relatedness values (r) among various sizes of colonies (most samples had approximately 200 member colonies). [3] For mother-daughter relationships, genetic relatedness is low in comparison to other species of bee. [3] Although mothers and daughters share the minimum of one allele, only 11% of daughters who were immature shared the colony with their mother. [3] This indicates that most young females do not have their mother present. [3] However, this statistic was even lower for mother-son relationships (r=.125). [3] Indeed, only about 20% of all juveniles in the colony had any type of closely related adult present. [3] These statistics seem to reveal that parental care is highly generalized [3] and occurs in the absence of kin selection and is probably related to the fact that females act indiscriminately towards each other. [3] Nest switching and migratory behaviors also result in the decreased genetic relatedness among adults and their respective kins. [5]

In terms of genetic relatedness among sister-sister relationships and sister-brother relationships, however, there is a substantial difference. [14] L. hemichalceum tends to avoid inbreeding whenever it is possible because of their sex determination system, which uses a single locus mechanism. [14] Should members of the same family breed with one another, there is the possibility that the male offspring will either be haplodiploid (normal phenotype) or diploid (sterile phenotype). [14] Thus inbreeding is a highly avoided behavior by many of the females. [14] This lack of inbreeding impacts the genetic relatedness of siblings. [14] For sister-sister relatedness there tends to be a significant number of full sister relationships within the colony among juveniles. [14] This may be attributed to the fact that juveniles do not need to avoid their female siblings in the same way that they do male siblings in order to avoid inbreeding. [14] Along the same lines, sister-brother relatedness is low within the same nest because the females tend to leave if there are male relatives nearby. [14]

Costs and benefits to sociality

There are many advantages and disadvantages for L. hemichalceum in terms of living communally in a large colony. [3] While many members may be living with unrelated individuals (about 50% of adult females do not have daughters or sisters of any type nearby in the colony), [3] they gain many advantages. One of the primary benefits is constant care for larvae and offspring. [3] It takes approximately six weeks for a larva to reach adulthood, and by having other adults nearby that are able to guard the nest, the risk of predation from ants is significantly reduced. [3] Another benefit is life insurance. [3] Foraging is highly risky activity, and should a mother be killed while foraging, her offspring will be protected by other members of the colony. [3] Thus, forming a colony that is larger in size (the typical colony is about 200), is advantageous in terms of brood protection. [3] However, there are disadvantages as well. [3] While the presence of adult L. hemichalceum is effective at warding off unwanted predators, such as ants, there are no active defense behaviors. [3] This makes it less advantageous to be in a large colony in moments when active defense is needed. Furthermore, another disadvantage are cheaters who exploit the cooperative protection that the colony offers. [7] It is thought that communal protection of unknown broods prevents exploitation, however this theory is still being explored. [3]

Kin recognition

While it is thought that L. hemichalceum displays kin recognition, it is yet to be confirmed. [7] Originally the cooperative behavior and act of trophallaxis that is displayed towards both genetically related kin and non-related kin was attributed to lack of kin recognition. [7] However, it is now thought that females simply do not show special treatment towards their own kin. [7] This is exemplified by a lack of guarding against unknown individuals, and the migration of females between different nests. [7] Thus, this attitude of universal acceptance has led scientists to conclude that there is either the absence of recognition cues, or lack of responsive behavior to those cues. [7] Furthermore, while there are no differences in behavior pattern that can be attributed to relatedness, there are differences associated with the grouping of several nests, suggesting that there may be environmental cues for behavior. [7]

Agonistic behavior

Unlike other species of Lasiolgossum,L. hemichalceum rarely display agonistic behaviors towards another. [7] Agonistic behaviors typically include patterns such as lunging or moving their bodies in the shape of a C while pointing the stinger and mandibles towards the offender. [7] Typically the C-shaped body (also known as C-posture) behavioral pattern was observed in about 19% of conflicts, and even fewer in terms of the lunging pattern. [7] This demonstrates that although they are capable of displaying agonistic behaviors, they choose not to. [7] Lack of agonistic behavioral patterns is a characteristic of the L. hemichalceum that is very different from L. hemichalceum's close relative, L. zephyrum. [7]

Variable pupae nutrition

For L. hemichalceum larval nutrition was one of the largest environmental factors in determining male morphology. [6] When a female prepares to lay eggs, they first construct individual cells and place small pollen balls (a mixture of nectar and pollen) into the cells. [6] However, the variation in both the size of the cell and the pollen ball seems to impact whether or not male morphology is macrocephalic or that of a normal male. [6] The factors impact one another; for example, the dimensions and volume of the cell dictate the amount of nectar and pollen that females gathered, and the subsequent size of the pollen balls for the cells. [6] However, the size of the pollen balls also affect the pathway for development. [6] Typically females will place fertilized female eggs on pollen balls that are proportionately bigger than the ones given to males. [16] However, it is hypothesized that macrocephalic males may be the result of females unintentional placement of unfertilized eggs (male eggs) onto pollen balls that are intended for female eggs. [16] By providing males with additional nutrition, they are able to attain heavier weights as pupae, and develop into larger, bulkier adult males. [6] Thus, dimorphic male development in L. hemichalceum is thought to be impacted by cell size and pollen ball size, rather than just genetic differences between males. [6]

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">Trophallaxis</span> Transfer of food between members of a community through stomodeal or proctodeal means

Trophallaxis is the transfer of food or other fluids among members of a community through mouth-to-mouth (stomodeal) or anus-to-mouth (proctodeal) feeding. Along with nutrients, trophallaxis can involve the transfer of molecules such as pheromones, organisms such as symbionts, and information to serve as a form of communication. Trophallaxis is used by some birds, gray wolves, vampire bats, and is most highly developed in eusocial insects such as ants, wasps, bees, and termites.

<span class="mw-page-title-main">Halictidae</span> Family of bees

Halictidae is the second-largest family of bees with nearly 4,500 species. They are commonly called sweat bees, as they are often attracted to perspiration. Halictid species are an extremely diverse group that can vary greatly in appearance. These bees occur all over the world and are found on every continent except Antarctica. Usually dark-colored and often metallic, halictids are found in various sizes, colors and patterns. Several species are all or partly green and a few are red, purple, or blue. A number of them have yellow markings, especially the males, which commonly have yellow faces, a pattern widespread among the various families of bees. The family is one of many with short tongues and is best distinguished by the arcuate basal vein found on the wing. Females in this family tend to be larger than the males. They are the group for which the term 'eusocial' was first coined by entomologist, Suzanne Batra.

<i>Halictus rubicundus</i> Species of bee

Halictus rubicundus, the orange-legged furrow bee, is a species of sweat bee found throughout the Northern Hemisphere. H. rubicundus entered North America from the Old World during one of two main invasions of Halictus subgenera. These invasions likely occurred via the Bering land bridge at times of low sea level during the Pleistocene epoch.

<i>Lasioglossum malachurum</i> Species of bee

Lasioglossum malachurum, the sharp-collared furrow bee, is a small European halictid bee. This species is obligately eusocial, with queens and workers, though the differences between the castes are not nearly as extreme as in honey bees. Early taxonomists mistakenly assigned the worker females to a different species from the queens. They are small, shiny, mostly black bees with off-white hair bands at the bases of the abdominal segments. L. malachurum is one of the more extensively studied species in the genus Lasioglossum, also known as sweat bees. Researchers have discovered that the eusocial behavior in colonies of L. malachurum varies significantly dependent upon the region of Europe in which each colony is located.

<i>Lasioglossum</i> Genus of insects

The sweat bee genus Lasioglossum is the largest of all bee genera, containing over 1800 species in numerous subgenera worldwide. They are highly variable in size, coloration, and sculpture; among the more unusual variants, some are cleptoparasites, some are nocturnal, and some are oligolectic. Most Lasioglossum species nest in the ground, but some nest in rotten logs.

<span class="mw-page-title-main">Halictinae</span> Subfamily of bees

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<i>Lasioglossum zephyrus</i> Species of bee

Lasioglossum zephyrus is a sweat bee of the family Halictidae, found in the U.S. and Canada. It appears in the literature primarily under the misspelling "zephyrum". It is considered a primitively eusocial bee, although it may be facultatively solitary. The species nests in burrows in the soil.

<i>Halictus ligatus</i> Species of bee

Halictus ligatus is a species of sweat bee from the family Halictidae, among the species that mine or burrow into the ground to create their nests. H. ligatus, like Lasioglossum zephyrus, is a primitively eusocial bee species, in which aggression is one of the most influential behaviors for establishing hierarchy within the colony, and H. ligatus exhibits both reproductive division of labor and overlapping generations.

<i>Megalopta genalis</i> Species of bee

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<i>Lasioglossum cressonii</i> Species of insect

Lasioglossum cressonii is a species in the sweat bee genus Lasioglossum, family Halictidae. Halictidae exhibit eusocial hierarchy behavior which is interesting given that eusociality in this group is hard to evolve and easy to lose. L. cressonii is found throughout North America. L. cressonii have been shown to be important pollinators for apple trees and many other North American native plants.

<i>Melipona bicolor</i> Species of bee

Melipona bicolorLepeletier, 1836, commonly known as Guaraipo or Guarupu, is a eusocial bee found primarily in South America. It is an inhabitant of the Araucaria Forest and the Atlantic Rainforest, and is most commonly found from South to East Brazil, Bolivia, Argentina, and Paraguay. It prefers to nest close to the soil, in hollowed trunks or roots of trees. M. bicolor is a member of the tribe Meliponini, and is therefore a stingless bee. This species is unique among the stingless bees species because it is polygynous, which is rare for eusocial bees.

Lasioglossum figueresi, formerly known as Dialictus figueresi, is a solitary sweat bee that is part of the family Halictidae of the order Hymenoptera. Found in Central America, it nests in vertical earthen banks which are normally inhabited by one, though sometimes two or even three, females. Females die before their larvae hatch. It was named after José Figueres Ferrer, a famous Costa Rican patriot, and studies of its behavior are now general models for social behavior studies.

<i>Exoneura robusta</i> Species of bee

Exoneura robusta is a species of the primitively eusocial allodapine bee, belonging to the genus commonly referred to as "reed bees". Their common name derives from their use of the soft pith of dead fern fronds as a nesting material. They are native to southeastern Australia, living in both montane and heathland habitats. E. robusta do not have a fixed pattern of sociality, but rather they are capable of adapting their social strategy to different environments. While typically univoltine, populations living in warmer habitats are capable of producing two broods per season. This leads to the incidence of sibling rearing and eusocial behavior. E. robusta lack strict morphological castes, thus allowing for their plastic social behavior and dominance hierarchies.

<i>Lasioglossum leucozonium</i> Species of bee

Lasioglossum leucozonium, also known as Lasioglossum similis, is a widespread solitary sweat bee found in North America, Europe, Asia, and parts of northern Africa. While now a common bee in North America, population genetic analysis has shown that it is actually an introduced species in this region. This population was most likely founded by a single female bee.

<i>Augochlora pura</i> Species of insect

Augochlora pura is a solitary sweat bee found primarily in the Eastern United States. It is known for its bright green color and its tendency to forage on a variety of plants. Inhabiting rotting logs, this bee can produce up to three generations per year. Both males and females have been observed licking sweat from human skin, most likely seeking salt

<i>Halictus sexcinctus</i> Species of bee

Halictus sexcinctus, commonly referred to as the six-banded furrow bee, is a species of sweat bee found throughout Europe and as far east as Asian Turkey and Iraq. The H. sexcinctus can be easily confused with the closely related species, Halictus scabiosae, due to very similar morphological features. H. sexcinctus show a social polymorphism in which different colonies can exhibit solitary, communal, or eusocial structure. Due to this large variance in social organization, it was suspected that it was not one species at all, but rather multiple, cryptic species. However, genetic analysis was able to confirm these varying populations as one species. H. sexcinctus will forage from multiple flower species, but prefers plant species with wide-open flowers. Their nests can be found dug into the ground in loamy or sandy soil.

<i>Macrotera portalis</i> Species of bee

Macrotera portalis is a species of communal, ground nesting, partially bivoltine bees found in arid grasslands and desert regions of North America. An oligolectic bee, M. portalis gathers pollen only from plants in the genus Sphaeralcea and has patterns of seasonal emergence to survive the harsh conditions of the desert, with emergence delayed until monsoon rains arrive.

<span class="mw-page-title-main">Dialictus</span> Subgenus of insects

Dialictus is a subgenus of sweat bees belonging to the genus Lasioglossum. Most of the members of this subgenus have a metallic appearance, while some are non-metallic. There are over 630 species worldwide. They are commonly found in the Northern Hemisphere and are found in abundance in North America. Members of this subgenus also have very diverse forms of social structure making them model organisms for studying the social behavior of bees.

<i>Augochlorella</i> Genus of bees

Augochlorella is a genus in the bee family Halictidae, commonly called sweat bees. They display metallic coloration, ranging from reddish to gold to bluish green, as is typical for other genera in the tribe Augochlorini.

References

  1. ↑ Houston, T. (2018) A Guide to Native Bees of Australia. CSIRO Publishing
  2. ↑ Kukuk, P.F. (2002). "Highly polymorphic microsatellite markers developed for the social halictine bee Lasioglossum (Chilalictus) hemichalceum" (PDF). Molecular Ecology Notes (2): 529–530. Retrieved 22 September 2015.
  3. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Forbes, Stephen. H. (2002). "Extended parental care in communal social groups". Journal of Insect Science. 2 (22): 22. doi:10.1673/031.002.2201. PMC   355920 . PMID   15455056.
  4. 1 2 Kukuk, Penelope. F. (Jan 1987). "Intranest Behavior of the Communal Sweat Bee Lasioglossum (Chilalictus) erythrurum (Hymenoptera: Halictidae)". Journal of the Kansas Entomological Society. 60 (1): 58–64. JSTOR   25084866.
  5. 1 2 3 4 5 6 7 8 9 10 11 12 Kukuk, P. F.; Sage, G. K. (1994-12-01). "Reproductivity and relatedness in a communal halictine bee Lasioglossum (Chilalictus) hemichalceum". Insectes Sociaux. 41 (4): 443–455. doi:10.1007/BF01240647. ISSN   0020-1812.
  6. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Kukuk, Penelope F. (October 1996). "Male dimorphism in Lasioglossum (Chilalictus) hemichalceum: The role of larval nutrition". Journal of the Kansas Entomological Society. 69 (4): 147–157. JSTOR   25085712.
  7. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Kukuk, Penelope F. (1992-01-12). "Social interactions and familiarity in a communal halictine bee Lasioglossum (Chilalictus) hemichalceum". Ethology. 91 (4): 291–300. doi:10.1111/j.1439-0310.1992.tb00870.x. ISSN   1439-0310.
  8. ↑ "ITIS Standard Report Page: Lasioglossum hemichalceum". www.itis.gov. Retrieved 2015-09-26.
  9. 1 2 3 Danforth, Bryan N.; Eardley, Connal; Packer, Laurence; Walker, Kenneth; Pauly, Alain; Randrianambinintsoa, Fano José (2008-01-01). "Phylogeny of Halictidae with an emphasis on endemic African Halictinae". Apidologie. 39 (1): 86–101. doi: 10.1051/apido:2008002 . ISSN   0044-8435.
  10. 1 2 3 4 5 6 7 8 "55 number 1 part 1 - Memoirs of the Museum of Victoria. - Biodiversity Heritage Library". biodiversitylibrary.org. Retrieved 2015-09-25.
  11. 1 2 3 4 Kukuk, Penelope F.; Schwarz, Michael (1987-01-01). "Intranest behavior of the communal sweat bee Lasioglossum (Chilalictus) erythrurum (Hymenoptera: Halictidae)". Journal of the Kansas Entomological Society. 60 (1): 58–64. JSTOR   25084866.
  12. 1 2 "Species Lasioglossum (Chilalictus) hemichalceum (Cockerell, 1923)". Australian Government: Department of the Environment. Australian Government: Department of the Environment. Retrieved 22 September 2015.
  13. ↑ "Climate and Weather". Climate and Weather. Government of Australia. October 2012. Archived from the original on 8 September 2015. Retrieved 10 December 2017.
  14. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Kukuk, Penelope F.; Bitney, Charla; Forbes, Stephen H. (2005-12-01). "Maintaining low intragroup relatedness: evolutionary stability of nonkin social groups". Animal Behaviour. 70 (6): 1305–1311. doi:10.1016/j.anbehav.2005.03.015.
  15. 1 2 3 4 Kukuk, Penelope F. (2002-01-01). "Nest reuse in a communal halictine Bee, Lasioglossum (Chilalictus) hemichalceum (Hymenoptera: Halictidae)". Journal of the Kansas Entomological Society. 75 (1): 3–7. JSTOR   25086033.
  16. 1 2 West-Eberhard, Mary Jane (2003-02-12). Developmental Plasticity and Evolution. Oxford University Press. ISBN   9780199880737.
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