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Data from: Task specialization in two social spiders, Stegodyphus sarasinorum (Eresidae) and Anelosimus eximius (Theridiidae).
- 负责人：
- Settepani, Virginia
- DOI：
- doi:10.5061/dryad.78vr9
- 摘要：
- in the evolution of cooperation. Division of labour and caste formation is restricted to eusocial organisms, but behavioural asymmetries and reproductive skew is common in other
Data from: Incomplete control and concessions explain mating skew in male chimpanzees
- 负责人：
- DOI：
- doi:10.5061/dryad.r4d09
- 摘要：
- Sexual selection theory predicts that because male reproductive success in mammals is limited by access to females, males will attempt to defend access to mates and exclude rivals from mating. In mammals, dominance rank is correlated with male reproductive success; however, the highest-ranking (alpha) male rarely monopolizes reproduction completely. To explain why, incomplete control models propose that alpha males simply cannot control other males' access to mates. If true, then dominance rank should be a key factor influencing subordinate (non-alpha) male mating success. Alternatively, the concession model states that alpha males can prevent other males from gaining access to mates but posits that they concede matings to subordinates in exchange for social favours. This predicts that a male's grooming interactions with the alpha should mediate his access to females. We test these predictions using 36 years of data, encompassing the tenures of eight alpha male chimpanzees at Gombe National Park, Tanzania. Incomplete control models were most strongly supported. At a given copulation event, the probability that the alpha was the male that mated was negatively associated with the number of males and sexually receptive females in the party. Additionally, as the number of males increased, high dominance rank was associated with an increased likelihood that a particular non-alpha male mated. The concession model, however, was also supported. The amount of time a male spent grooming with the alpha was positively associated with his likelihood of mating when the alpha was present in the party. As grooming is a major affiliative component of male social relationships, our results suggest that social bonds with dominant individuals are leveraged for mating access, particularly in species in which males form coalitions.
Data from: Trade-offs in lactation and milk intake by competing siblings in a fluctuating environment
- 负责人：
- DOI：
- doi:10.5061/dryad.0m068
- 摘要：
- to a litter is insufficient, sibling competition should skew milk consumption in favor of dominant litter members. We quantified milk nutritional composition
Data from: Effective number of breeders, effective population size and their relationship with census size in an iteroparous species, Salvelinus fontinalis
- 负责人：
- DOI：
- doi:10.5061/dryad.nh448
- 摘要：
- ~0.3 to ~0.001). Using AgeNe we then show that the variance in reproductive success or reproductive skew varied among populations by a factor of 40 from a Vk
Data from: Breeding sex ratio and population size of loggerhead turtles from Southwestern Florida
- 负责人：
- DOI：
- doi:10.5061/dryad.q2kf0
- 摘要：
- incubation temperatures can skew sex ratios towards females. There are concerns that temperature increases may result in highly female-biased offspring sex ratios, which
Data from: The state of European research in tropical biology
- 负责人：
- DOI：
- doi:10.5061/dryad.sj578
- 摘要：
- . However, exceptions to this pattern demonstrate how science policy agendas can skew the capacity of countries to conduct biological research in the tropics
Data from: Introducing ORCID
- 负责人：
- 关键词：
- DOI：
- doi:10.5061/dryad.48s16
- 摘要：
- is coming into focus. The biases are also apparent: ORCID users skew young, and certain countries are over- and underrepresented. The code for processing
Data from: Phenological, but not social, variation associated with climate differences in a eusocial sweat bee, Halictus ligatus, nesting in southern Ontario
- 负责人：
- DOI：
- doi:10.5061/dryad.vm11c
- 摘要：
- reproductive skew favouring queens, while moderate conditions favour increasing worker reproduction. To test these predictions, we compared the phenology
Data from: Reproductive sharing in relation to group and colony-level attributes in a cooperative breeding fish
- 负责人：
- DOI：
- doi:10.5061/dryad.rv5mg
- 摘要：
- The degree to which group members share reproduction is dictated by both within-group (e.g. group size and composition) and between-group (e.g. density and position of neighbours) characteristics. While many studies have investigated reproductive patterns within social groups, few have simultaneously explored how within-group and between-group social structure influence these patterns. Here, we investigated how group size and composition, along with territory density and location within the colony, influenced parentage in 36 wild groups of a colonial, cooperatively breeding fish Neolamprologus pulcher. Dominant males sired 76% of offspring in their group, whereas dominant females mothered 82% of offspring in their group. Subordinate reproduction was frequent, occurring in 47% of sampled groups. Subordinate males gained more paternity in groups located in high-density areas and in groups with many subordinate males. Dominant males and females in large groups and in groups with many reproductively mature subordinates had higher rates of parentage loss, but only at the colony edge. Our study provides, to our knowledge, the first comprehensive quantification of reproductive sharing among groups of wild N. pulcher, a model species for the study of cooperation and social behaviour. Further, we demonstrate that the frequency of extra-pair parentage differs across small social and spatial scales.
Data from: Lack of aggression and apparent altruism towards intruders in a primitive termite
- 负责人：
- DOI：
- doi:10.5061/dryad.tb0c7
- 摘要：
- In eusocial insects, the ability to discriminate nest-mates from non-nest-mates is widespread and ensures that altruistic actions are directed towards kin and agonistic actions are directed towards non-relatives. Most tests of nest-mate recognition have focused on hymenopterans, and suggest that cooperation typically evolves in tandem with strong antagonism towards non-nest-mates. Here, we present evidence from a phylogenetically and behaviourally basal termite species that workers discriminate members of foreign colonies. However, contrary to our expectations, foreign intruders were the recipients of more rather than less cooperative behaviour and were not subjected to elevated aggression. We suggest that relationships between groups may be much more peaceable in basal termites compared with eusocial hymenoptera, owing to energetic and temporal constraints on colony growth, and the reduced incentive that totipotent workers (who may inherit breeding status) have to contribute to self-sacrificial intergroup conflict.
