High relatedness and inbreeding in two species of haplodiploid eusocial thrips (Insecta: Thysanoptera) revealed by microsatellite analysis

  title={High relatedness and inbreeding in two species of haplodiploid eusocial thrips (Insecta: Thysanoptera) revealed by microsatellite analysis},
  author={Thomas W. Chapman and Bernard J. Crespi},
  journal={Behavioral Ecology and Sociobiology},
Abstract Relatedness and inbreeding coefficients were estimated for Oncothrips tepperi and O. habrus, two species of eusocial gall-forming thrips, using data from two microsatellite loci. Relatedness between sets of individuals (sexes and castes) for O. tepperi ranged from 0.5 to 0.85 and for O. habrus estimates were centered around 0.5. Multiple mating in O. habrus was implicated in lowering relatedness within a gall. We estimated the inbreeding coefficient to be 0.38 for both species, the… 

The Evolutionary Ecology of Eusociality in Australian Gall Thrips: a ‘Model Clades’ Approach

Analysis of the associations between genetic and ecological traits that resulted from the social-adaptive radiation of gall thrips with soldiers provides two main insights: first, fewer matings by foundresses, and less mating after dispersal, result in stronger local mate competition, higher relatedness (and a higher inbreeding coefficient) among soldier females, and a stronger female bias in dispersers.

Inbreeding ancestors: the role of sibmating in the social evolution of gall thrips.

Microsatellite data used to estimate levels of inbreeding in four species of solitary gall thrips on Australian Acacia showed that the ancestral lineage that gave rise to soldiers was apparently highly inbred, and therefore, inbreeding could have played a role in the origin of sociality within this group.

The evolution of soldier reproduction in social thrips

This is the first study to analyze the social-evolutionary trajectories of reproductive, behavioral, and morphological differentiation in the context of a species-level phylogeny and suggests that this difference in evolutionary routes to eusociality between taxa with soldiers andTaxa with foraging workers was driven by a weaker trade-off between helping and reproducing, and a greater ability of the helpers to withstand reproductive domination, in taxas with soldiers.

Phylogenetics of Australian Acacia thrips: the evolution of behaviour and ecology.

Life history of Kladothrips ellobus and Oncothrips rodwayi: insight into the origin and loss of soldiers in gall‐inducing thrips

The life history of two solitary, gall‐inducing thrips and Oncothrips rodwayi was investigated, and data for solitary and eusocial species from previous studies were re‐analysed.

A fully reproductive fighting morph in a soldier clade of gall-inducing thrips (Oncothrips morrisi)

The first life history data for Oncothrips morrisi, a species in a clade of haplodiploid, Australian gall-inducing thrips that has a micropteran fighting morph in the first generation of the gall, is presented, and selection to defend one's offspring may have promoted the evolution of soldier-like morphology and behaviour.

Social biology and sex ratios in the gall-inducing thrips, Oncothrips waterhousei and Oncothrips habrus

A comparison of the proportion of the gall occupied by brood in O. waterhousei and another eusocial galling thrips, Kladothrips hamiltoni, suggests that local resource competition is higher in K. ham Miltoni, which might partly explain the lack of sex ratio bias in soldiers of the latter species.

Sib‐mating in the ant Plagiolepis pygmaea: adaptative inbreeding?

The data show that workers actively repel unrelated males entering their colony, and that queens preferentially mate with related males, consistent with inclusive fitness being a driving force for inbreeding: by preventing outbreeding, workers reduce erosion of relatedness within colonies due to polygyny and polyandry.

Phylogenetics of gall-inducing thrips on Australian Acacia

Examination of the distribution of the three primary life history strategies employed by gall-inducing thrips indicates that two of the strategies may have evolved as a result of factors associated with host plant affiliations or through parasite pressure, but the phylogeny does not support the existing generic classification of the group.

Natural history and description of Oncothrips kinchega, a new species of gall-inducing thrips with soldiers (Thysanoptera: Phlaeothripidae)

A new species of gall-inducing thrips, Oncothrips kinchega sp. n., is described and its biology on the host plant Acacia carneorum was investigated. Our study showed that a single foundress initiates



Eusociality in Australian gall thrips

The presence of eusociality is reported in a second haplodiploid insect taxon, the order Thysanoptera, which provides remarkable new opportunities for analysing the causes of the evolution of eUSociality.

Ecology and evolution of galling thrips and their allies.

Galling thrips, by virtue of their haplodiploid genetic system and their ecological relationships with plants and natural enemies, are useful for analyzing a wide range of ecological, evolutionary, and behavioral questions.

Behavioural ecology of Australian gall thrips (Insecta, Thysanoptera)

Data is presented on aspects of gall morphology, male and female morphology, behaviour, life cycles, and sex ratios for six gall-forming species, five species of inquilines (invaders that do not form galls), and one genus that uses secretions to glue phyllodes (modified petioles) together.

Effect of inbreeding on genetic relatedness.

The effect of inbreeding on genetic relatedness (intragroup genotypic correlation) is examined in several models with special emphasis on social Hymenoptera (all male-haploid) living in nests and for polygyny and polyandry.

Phylogenetics of social behavior in Australian gall-forming thrips: evidence from mitochondrial DNA sequence, adult morphology and behavior, and gall morphology.

The phylogeny implies that soldiers originatedonce or twice early in the history of this clade, that soldiers were lost once or twice, and that soldiers evolved from winged dispersers rather than from nonsoldier within-gall reproductive offspring of foundresses.

Biosystematics of two new gall-inducing thrips with soldiers (Insecta: Thysanoptera) from Acacia trees in Australia

Four species in three genera of Phlaeothripidae are now known to induce phyllode galls on Australian Acacia trees, and four of these in two genera produce soldiers, which have enlarged fore legs to defend their gall from invaders.


It was found that inbreeding was not contributing to between‐group genetic variance, at any level, in a consistent manner across localities, and it was suggested that large benefits for group living may be responsible for maintaining altruistic behavior, in part, in this species.

Measurements of Inbreeding and Average Relatedness in a Termite Population

Colonies of the termite Reticulitermes flavipes are inbred and genetically isolated from nearby colonies. Termites were sampled in a hierarchical manner and subjected to starch-gel-protein

Evolution of Sociality in Insects

It is the view that a whole series of factors acting jointly or alternately is responsible for the numerous origins of sociality in Hymenoptera, compared to only one in all the other insects.