Gynandromorphs as indicators of modularity and evolvability in ants

Yang, Andrew S.; Abouheif, Ehab

doi:10.1002/jez.b.21407

Cited by 34 publications

(28 citation statements)

References 45 publications

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“…) do not correspond to the head developmental modules 486 inferred byYang and Abouheif (2011) in their examination of Pheidole gynandromorphs. If both 487 studies are correct, this would imply that developmental modularity does not underlie the macroevolutionary modularity we infer, leaving selection and non-genetic influences, as well as 489 methodological issues with comparing fixed landmarks and semi-landmarks, as the most likely 490 explanations for why different regions of the head appear to evolve separately or independently.…”

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confidence: 83%

Macroevolutionary integration of phenotypes within and across ant worker castes

Friedman

Bennet

Fischer

et al. 2019

Preprint

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27Phenotypic traits are often integrated into evolutionary modules: sets of organismal parts that 28 evolve together. In social insect colonies the concepts of integration and modularity apply to sets 29 of traits both within and among functionally and phenotypically differentiated castes. On 30 macroevolutionary timescales, patterns of integration and modularity within and across castes 31 can be clues to the selective and ecological factors shaping their evolution and diversification. 32We develop a set of hypotheses describing contrasting patterns of worker integration and apply 33 this framework in a broad (246 species) comparative analysis of major and minor worker 34 evolution in the hyperdiverse ant genus Pheidole. Using geometric morphometrics in a 35 phylogenetic framework, we inferred fast and tightly integrated evolution of mesosoma shape 36 between major and minor workers, but slower and more independent evolution of head shape 37 between the two worker castes. Thus, Pheidole workers are evolving as a mixture of intra-and 38 inter-caste integration and rate heterogeneity. The decoupling of homologous traits across worker 39 castes may represent an important process facilitating the rise of social complexity. 40 41

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confidence: 83%

Macroevolutionary integration of phenotypes within and across ant worker castes

Friedman

Bennet

Fischer

et al. 2019

Preprint

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“…Sex mosaicism (also called gynandromorphism) has been reported frequently, mostly as single cases, in ants [Yang and Abouheif (2011); Yoshizawa et al (2009); and references therein]. Due to their haplodiploid sex determination system, the genetic descent of female and male body parts in ant sex mosaics is of particular interest.…”

Section: Introductionmentioning

confidence: 99%

Paternally inherited alleles in male body parts of an ant (Diacamma sp.) sex mosaic: implication for androgenetic male production in the Hymenoptera

et al. 2011

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Sex mosaicism, also called gynandromorphism, refers to an accidental phenomenon in dioecious organisms (mainly animals) in which an individual phenotype includes both female and male characteristics. Despite the rarity of this phenomenon, elucidating the mechanisms of naturally occurring sex mosaicism should deepen our understanding of diverse sex determination and differentiation systems in nature. We report the results of a genetic study of a sex mosaic individual of the ant Diacamma sp. from Japan's Okinawa Island. Parentage analysis using microsatellite markers revealed that the female and male parts of the sex mosaic showed different inheritance patterns: female parts had alleles consistent with their biparental inheritance, whereas most of the male parts had alleles consistent with their paternal inheritance (i.e., androgenesis). We discuss plausible cytogenetic mechanisms that gave rise to the male parts of this individual: polyspermy and the subsequent independent cleavage by a surplus sperm pronucleus, and maternal genome elimination after fertilization of an ovule. Moreover, we hypothesize that the androgenetically produced males found in some Hymenoptera might share the same underlying cytogenetic mechanism with hymenopteran sex mosaicism.

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“…Because a cast system exists in ants, different combinations of male and female tissue can occur, for which Campos et al (2011) proposed the names gynandromorph (queen-male), ergatandromorph (worker-male), and dynergatandromorph (soldier-male). "Intercaste" individuals, in which different female castes are combined (e.g., queen-worker [gynergatandromorph], queen-soldier [ergatogynandromorph], and worker-soldier [androergatogynomorph]), also occur, but are not true gynandromorphs because both castes are female (Yang and Abouheif 2011).…”

Section: Notementioning

confidence: 98%