Genetic diversity varies with species traits and latitude in predatory soil arthropods (Myriapoda: Chilopoda)

Bharti, D. K.; Pawar, Pooja Yashwant; Edgecombe, Gregory D.; Joshi, Jahnavi

doi:10.1111/geb.13709

Cited by 5 publications

(2 citation statements)

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“…Population genetic theory predicts that genetic diversity will increase with Ne and mutation rate ( Charlesworth, 2009 ). Previous empirical work linking behavioral and life-history traits, such as reproductive strategy, fecundity, and body size with genetic diversity has suggested that these associations are ultimately mediated by changes in Ne ( Bharti et al, 2023 ; Chak et al, 2022 ; Romiguier et al, 2014 ; Settepani et al, 2017 ). However, our results cannot be explained by demography because populations were maintained at similar population sizes with no differences in fecundity ( Schrader, 2017 ) and no possibility of overlapping generations and/or changes in mating structure.…”

Section: Discussionmentioning

confidence: 99%

Parental care shapes the evolution of molecular genetic variation

Mashoodh,

Trowsdale,

Manica

et al. 2023

Evolution Letters

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Cooperative social behaviors, such as parental care, have long been hypothesized to relax selection leading to the accumulation of genetic variation in populations. Although the idea has been discussed for decades, there has been relatively little experimental work to investigate how social behavior contributes to genetic variation in populations. Here, we investigate how parental care can shape molecular genetic variation in the subsocial insect, Nicrophorus vespilloides. Using whole-genome sequencing of populations that had evolved in the presence or absence of parental care for 30 generations, we show that parental care maintains levels of standing genetic variation. In contrast, under a harsh environment without care, strong directional selection caused a reduction in genetic variation. Furthermore, we show that adaptation to the loss of care is associated with genetic divergence between populations at loci related to stress, morphological development, and transcriptional regulation. These data reveal how social behavior is linked to the genetic processes that shape and maintain genetic diversity within populations, and provides rare empirical evidence for an old hypothesis.

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Section: Discussionmentioning

confidence: 99%

Parental care shapes the evolution of molecular genetic variation

Mashoodh,

Trowsdale,

Manica

et al. 2023

Evolution Letters

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“…Soil arthropods like centipedes (Class: Chilopoda) are ideal models to test Gondwanan or global vicariance biogeography hypotheses due to their high taxonomic, genetic and trait diversity and extensive evolutionary history (Bharti et al, 2023; Wong et al, 2019; Z.-Q. Zhang, 2011).…”

Section: Introductionmentioning

confidence: 99%

A passage through India: the biotic ferry model supports the build-up of Indo-Australian biodiversity of an ancient soil arthropod clade

Manivannan,

Gurung,

Edgecombe

et al. 2024

Preprint

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Aim: Scutigeromorpha is a globally distributed, ancient group of centipedes with at least 400 million years of evolutionary history. We assess the biogeographic history of the order, with a particular focus on the Peninsular Indian Plate (PIP), a Gondwanan fragment. We hypothesize that continental vicariance explains the disjunct distribution of extant scutigeromorphs, that PIP scutigeromorphs are of ancient Gondwanan origins, and that East Gondwana vicariance explains the diversification of the subfamily Thereuoneminae into its Asian and Australian clades. Location: Global. Taxa: Centipedes, Scutigeromorpha. Methods: We use a novel molecular dataset sampled across the PIP and a global sequence database representing the geographic distribution of all families and subfamilies. We employ molecular phylogenetic analyses on two mitochondrial and three nuclear markers, molecular species delimitation and ancestral range estimation to reconstruct biogeographic history. Results: Ancestral scutigeromorphs were likely widely distributed across Gondwana and diverged prior to any continental vicariance. Scutigeromorph biogeography is shaped by continental vicariance, long-distance dispersal and jump dispersal, indicating an ability to colonize areas far from their ancestral range. The PIP emerged as the ancestral range of Thereuoneminae, which started diversifying during the Cretaceous Period. Subsequent in-situ diversification within the PIP and dispersals into Asia, Australia, and the Pacific Islands best explained the extant distribution of Thereuoneminae, more so than East Gondwana vicariance. Main conclusions: The in-situ diversification of PIP species and their ancient divergence suggest they represent Gondwanan relicts in a landmass whose biota is primarily dispersal-driven. A single dispersal event from the PIP generated most of the extant diversity in Australia, another Gondwanan fragment. Furthermore, the discovery of 11 putative species from the PIP and the Andaman Islands, five times more than was known, highlights the Wallacean and Linnean shortfalls in tropical Asia.

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