Deep Human Genealogies Reveal a Selective Advantage to Be on an Expanding Wave Front

Moreau, Claudia; Bhérer, Claude; Vézina, Hélène; Jomphe, Michèle; Labuda, Damian; Excoffier, Laurent

doi:10.1126/science.1212880

Cited by 85 publications

(121 citation statements)

References 29 publications

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“…More specifically, mutations that occur at the edge of an expanding population can reach much higher allele frequencies than seen in stationary populations (44). This effect, known as "gene surfing" (45), has been documented in microbial communities (46,47), tortoises (48), and humans (49). Therefore an intriguing question is whether some of the variation among baboons may be related to demographic factors acting during the range expansion of the genus during the Pleistocene.…”

Section: Proximitymentioning

confidence: 99%

Male tolerance and male–male bonds in a multilevel primate society

Patzelt

Kopp

Ndao³

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

195

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Male relationships in most species of mammals generally are characterized by intense intrasexual competition, with little bonding among unrelated individuals. In contrast, human societies are characterized by high levels of cooperation and strong bonds among both related and unrelated males. The emergence of cooperative male-male relationships has been linked to the multilevel structure of traditional human societies. Based on an analysis of the patterns of spatial and social interaction in combination with genetic relatedness data of wild Guinea baboons (Papio papio), we show that this species exhibits a multilevel social organization in which males maintain strong bonds and are highly tolerant of each other. Several "units" of males with their associated females form "parties," which team up as "gangs." Several gangs of the same "community" use the same home range. Males formed strong bonds predominantly within parties; however, these bonds were not correlated with genetic relatedness. Agonistic interactions were relatively rare and were restricted to a few dyads. Although the social organization of Guinea baboons resembles that of hamadryas baboons, we found stronger male-male affiliation and more elaborate greeting rituals among male Guinea baboons and less aggression toward females. Thus, the social relationships of male Guinea baboons differ markedly from those of other members of the genus, adding valuable comparative data to test hypotheses regarding social evolution. We suggest that this species constitutes an intriguing model to study the predictors and fitness benefits of male bonds, thus contributing to a better understanding of the evolution of this important facet of human social behavior.association index | fission-fusion | multilevel society | range expansion | social network analysis

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Section: Proximitymentioning

confidence: 99%

Male tolerance and male–male bonds in a multilevel primate society

Patzelt

Kopp

Ndao³

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

195

View full text Add to dashboard Cite

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“…A similar pattern of high RMR at a range edge was found before in Australian cane toads (Llewellyn et al, 2012) and was argued to arise because of an 'Olympic village' effect. At range edges, strong selection for rapid maturation and prolific breeding may lead to dominance of individuals with particular life histories (Moreau et al, 2011). Associations between RMR and TAC responses to LPS at the individual level too suggest that life on the range edge might have as much to do with general alleviation of oxidative damage as responses to parasites (Rollins et al, 2015).…”

Section: Individual Predictors Of Inflammation Costsmentioning

confidence: 99%

Costs of immunity and their role in the range expansion of the house sparrow in Kenya

Martin

Kilvitis

Brace

et al. 2017

Journal of Experimental Biology

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There are at least two reasons to study traits that mediate successful range expansions. First, dispersers will found new populations and thus impact the distribution and evolution of species. Second, organisms moving into new areas will influence the fate of resident communities, directly competing with or indirectly affecting residents by spreading non-native or spilling-back native parasites. The success of invaders in new areas is likely mediated by a counterbalancing of costly traits. In new areas where threats are comparatively rare, individuals that grow rapidly and breed prolifically should be at an advantage. High investment in defenses should thus be disfavored. In the present study, we compared the energetic, nutritional and collateral damage costs of an inflammatory response among Kenyan house sparrow (Passer domesticus) populations of different ages, asking whether costs were related to traits of individuals from three different capture sites. Kenya is among the world's most recent range expansions for this species, and we recently found that the expression of Toll-like receptors (TLRs), leukocyte receptors that instigate inflammatory responses when bound to microbial elements, was related to the range expansion across the country. Here, we found (contrary to our expectations) that energetic and nutritional costs of inflammation were higher, but damage costs were lower, in range-edge compared with core birds. Moreover, at the individual level, TLR-4 expression was negatively related to commodity costs (energy and a critical amino acid) of inflammation. Our data thus suggest that costs of inflammation, perhaps mediated by TLR expression, might mitigate successful range expansions.

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“…advantage and a heritable component for fertility, suggesting that genes influencing fertility may be shaped by selection [17]. Considering the impact of female fertility alongside the challenges of pregnancy may be critical for understanding recent human adaptations.…”

Section: Selection and Pregnancymentioning

confidence: 99%