Surfing in tortoises? Empirical signs of genetic structuring owing to range expansion

Graciá, Eva; Botella, Francisco; Anadón, José D.; Edelaar, Pim; Harris, D. James; Gimenez, Andrés

doi:10.1098/rsbl.2012.1091

Cited by 47 publications

(48 citation statements)

References 15 publications

(42 reference statements)

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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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“…Gene surfing has been observed in multiple species, many with relatively low dispersal rates [18,19]. While these studies demonstrated the effects of genetic drift in shaping population genetics associated with range expansions, few studies have been carried out on organisms that undertake frequent and long-distance migrations.…”

Section: Introductionmentioning

confidence: 99%

Serial founder effects and genetic differentiation during worldwide range expansion of monarch butterflies

et al. 2014

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Range expansions can result in founder effects, increasing genetic differentiation between expanding populations and reducing genetic diversity along the expansion front. However, few studies have addressed these effects in long-distance migratory species, for which high dispersal ability might counter the effects of genetic drift. Monarchs (Danaus plexippus) are best known for undertaking a long-distance annual migration in North America, but have also dispersed around the world to form populations that do not migrate or travel only short distances. Here, we used microsatellite markers to assess genetic differentiation among 18 monarch populations and to determine worldwide colonization routes. Our results indicate that North American monarch populations connected by land show limited differentiation, probably because of the monarch's ability to migrate long distances. Conversely, we found high genetic differentiation between populations separated by large bodies of water. Moreover, we show evidence for serial founder effects across the Pacific, suggesting stepwise dispersal from a North American origin. These findings demonstrate that genetic drift played a major role in shaping allele frequencies and created genetic differentiation among newly formed populations. Thus, range expansion can give rise to genetic differentiation and declines in genetic diversity, even in highly mobile species.

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“…This phenomenon-called gene surfing-has been documented in several species, including humans (Moreau et al 2011), tortoises (Graciá et al 2013), and experimental microbial populations (Hallatschek and Nelson 2010), and it has been invoked in the explanation of patterns of genetic diversity in humans (Hofer et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Expansion Load and the Evolutionary Dynamics of a Species Range

Peischl

Kirkpatrick

Excoffier

2015

The American Naturalist

145

193

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. Online enhancements: appendixes.abstract: Expanding populations incur a mutation burden, the socalled expansion load. Using a mixture of individual-based simulations and analytical modeling, we study the expansion load process in models where population growth depends on the population's fitness (i.e., hard selection). We show that expansion load can severely slow down expansions and limit a species' range, even in the absence of environmental variation. We also study the effect of recombination on the dynamics of a species range and on the evolution of mean fitness on the wave front. If recombination is strong, mean fitness on front approaches an equilibrium value at which the effects of fixed mutations cancel each other out. The equilibrium rate at which new demes are colonized is similar to the rate at which beneficial mutations spread through the core. Without recombination, the dynamics is more complex, and beneficial mutations from the core of the range can invade the front of the expansion, which results in irregular and episodic expansion. Although the rate of adaptation is generally higher in recombining organisms, the mean fitness on the front may be larger in the absence of recombination because high-fitness individuals from the core have a higher chance to invade the front. Our findings have important consequences for the evolutionary dynamics of species ranges as well as on the role and the evolution of recombination during range expansions.

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Surfing in tortoises? Empirical signs of genetic structuring owing to range expansion

Cited by 47 publications

References 15 publications

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

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

Serial founder effects and genetic differentiation during worldwide range expansion of monarch butterflies

Expansion Load and the Evolutionary Dynamics of a Species Range

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