Density‐dependent changes of mating system and family structure in Brandt's voles (<i>Lasiopodomys brandtii</i>)

Batsuren, Erdenetuya; Zhang, Xin; Song, Mingjing; Wan, Xinru; Li, Guoliang; Liu, Jing; Huang, Shu‐Li; Zhang, Zhibin

doi:10.1002/ece3.9199

Cited by 6 publications

(4 citation statements)

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“…For example, density dependence often varies between age or sex classes (e.g. [77,78]), and age effects on infection are common and ecologically important [79,80], as are sex differences [81]. We chose not to analyse how individual animals' traits alter the shape or slope of density's effects for brevity and simplicity; however, given that many of the systems nevertheless include these data, future analyses could make use of this meta-dataset to investigate how density affects connectedness of different classes of hosts.…”

Section: Resultsmentioning

confidence: 99%

Density-dependent network structuring within and across wild animal systems

Albery,

Becker,

Firth

et al. 2024

Preprint

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High population density should drive individuals to more frequently share space and interact, producing better-connected spatial and social networks. Despite this widely-held assumption, it remains unconfirmed how local density generally drives individuals’ positions within wild animal networks. We analysed 34 datasets of simultaneous spatial and social behaviour in >55,000 individual animals, spanning 28 species of fish, reptiles, birds, mammals, and insects. >80% of systems exhibited strongly positive relationships between local density and network centrality, providing broad empirical evidence that local density increases connectedness at the individual level. However, >75% of density-connectedness relationships were nonlinear, and density’s importance declined at higher values in >70% of systems, signifying saturating effects. Density’s effect was much stronger and less saturating for spatial than social networks, suggesting population density drives individuals to become disproportionately spatially connected rather than socially. These findings reveal fundamental trends underlying societal structuring, with widespread behavioural, ecological, and evolutionary implications.

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Section: Resultsmentioning

confidence: 99%

Density-dependent network structuring within and across wild animal systems

Albery,

Becker,

Firth

et al. 2024

Preprint

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“…Brandt’s voles ( Lasiopodomys brandtii ) are social animals with a polygamous mating system ( Batsuren et al, 2022 ). Their population irrupts irregularly every 3–5 years, and both intrinsic (density and social conflict) and external (rainfall, grazing, and predators) factors have been shown to affect their population growth ( Zhang et al, 2003 ; Li et al, 2021b ).…”

Section: Methodsmentioning

confidence: 99%

High diversity, close genetic relatedness, and favorable living conditions benefit species co-occurrence of gut microbiota in Brandt’s vole

Cheng,

Li,

Yang

et al. 2024

Front. Microbiol.

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IntroductionRevealing factors and mechanisms in determining species co-existence are crucial to community ecology, but studies using gut microbiota data are still lacking.MethodsUsing gut microbiota data of 556 Brandt’s voles from 37 treatments in eight experiments, we examined the relationship of species co-occurrence of gut microbiota in Brandt’s voles (Lasiopodomys brandtii) with genetic distance (or genetic relatedness), community diversity, and several environmental variables.ResultsWe found that the species co-occurrence index (a larger index indicates a higher co-occurrence probability) of gut microbiota in Brandt’s voles was negatively associated with the genetic distance between paired ASVs and the number of cohabitating voles in the experimental space (a larger number represents more crowding social stress), but positively with Shannon diversity index, grass diets (representing natural foods), and non-physical contact within an experimental space (representing less stress).DiscussionOur study demonstrated that high diversity, close genetic relatedness, and favorable living conditions would benefit species co-occurrence of gut microbiota in hosts. Our results provide novel insights into factors and mechanisms that shape the community structure and function of gut microbiota and highlight the significance of preserving the biodiversity of gut microbiota.

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“…Therefore, females indirectly choose mates with large antlers, which in turn benefit males in these contests (53). However, within a species, diverse reproductive tactics may coexist, depending on demographic, environmental or individual conditions (37,43,49,(54)(55)(56)(57)(58)(59)(60). For example, whether a resource is defendable can hinge on the number of individuals competing for it, and switching to an alternative strategy can be advantageous (61)(62)(63).…”

Section: Introductionmentioning

confidence: 99%

Socio-ecological context modulates significance of territorial contest competition inDrosophila prolongata

De Nardo,

Biswas,

Perdigón Ferreira

et al. 2024

Preprint

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The intensity and direction of sexual selection is intricately linked to the social and ecological context. Theory predicts that male-biased operational sex ratios (OSR) and high population density should skew resource and mate monopolization toward few successful males, thereby intensifying sexual selection on males. Here, we studied how the mating system of the promiscuous and strongly sexually dimorphic fruit fly Drosophila prolongata responds to changes in the OSR and population density. We recorded groups of flies over five days and quantified territory occupancy, mating success, and competitive fertilization success. Although general indices of the intensity of sexual selection supported theoretical predictions, realized selection on morphological traits did not. Rather, we found selection on these traits to intensify under high density, but also under even as opposed to male-biased OSRs. Larger and more territorial males achieved higher mating success, but only under even OSRs. Similarly, competitive fertilization success, mainly determined by sperm precedence, was biased toward large males only under even OSRs. Finally, our combined results support a shift in the mating system from territorial contest competition to scramble competition under male-biased OSRs and potentially at low density, where there was no clear contribution of the measured traits to reproductive success. Our study emphasizes the limitations of traditional selection metrics and the role of the socio-ecological context in predicting adaptation to a changing environment.

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Density‐dependent changes of mating system and family structure in Brandt's voles (Lasiopodomys brandtii)

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 6 publications

References 97 publications

Density-dependent network structuring within and across wild animal systems

Density-dependent network structuring within and across wild animal systems

High diversity, close genetic relatedness, and favorable living conditions benefit species co-occurrence of gut microbiota in Brandt’s vole

Socio-ecological context modulates significance of territorial contest competition inDrosophila prolongata

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