Sex‐biased dispersal and high levels of gene flow among local populations in the argentine boa constrictor, <i>Boa constrictor occidentalis</i>

Rivera, Paula C.; Gardenal, Cristina N.; Chiaraviglio, Margarita

doi:10.1111/j.1442-9993.2006.01661.x

Cited by 36 publications

(34 citation statements)

References 31 publications

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“…2008), such that males have to disperse further to find territory that is not already occupied by other males (Johansson et al. 2008) and (ii) extensive mate‐searching movements by adult males (Rivera et al. 2006).…”

Section: Discussionmentioning

confidence: 99%

Restricted dispersal and genetic diversity in populations of an endangered montane lizard (Eulamprus leuraensis, Scincidae)

Dubey

Shine

2010

Molecular Ecology

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Many alpine species are under threat from global climate change, as their geographic ranges become increasingly fragmented and unsuitable. Understanding rates and determinants of gene flow among such fragmented populations, over historical as well as recent timescales, can help to identify populations under threat. It is also important to clarify the degree to which loss of local populations reduces overall genetic diversity within the taxon. The endangered Blue Mountains Water Skink (Eulamprus leuraensis) is restricted to <40 small swamps in montane south-eastern Australia. Our analyses of seven microsatellite loci of 241 animals from 13 populations show strong geographic structure, with major genetic divergence even between populations separated by <0.5 km. Dispersal between populations is scarce, and appears to involve mostly males. Our analyses suggest potential recent bottleneck events in all the identified populations, and lower genetic diversity and population size parameter at lower-elevation sites than at higher-elevation sites. Management of this endangered taxon thus needs to treat most populations separately, because of their genetic distinctiveness and low rates of genetic exchange.

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Section: Discussionmentioning

confidence: 99%

Restricted dispersal and genetic diversity in populations of an endangered montane lizard (Eulamprus leuraensis, Scincidae)

Dubey

Shine

2010

Molecular Ecology

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“…Such a mating system, where males perform active searches of receptive females, and females are philopatric, has been described for other snakes species within and outside the family Boidae (Paquin et al . 2006; Rivera et al . 2006; Koegh et al .…”

Section: Discussionmentioning

confidence: 99%

Population structure of an endemic vulnerable species, the Jamaican boa (Epicrates subflavus)

Tzika

Koenig

Miller³

et al. 2007

Molecular Ecology

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The Jamaican boa (Epicrates subflavus; also called Yellow boa) is an endemic species whose natural populations greatly and constantly declined since the late 19th century, mainly because of predation by introduced species, human persecution, and habitat destruction. In-situ conservation of the Jamaican boa is seriously hindered by the lack of information on demographic and ecological parameters as well as by a poor understanding of the population structure and species distribution in the wild. Here, using nine nuclear microsatellite loci and a fragment of the mitochondrial cytochrome b gene from 87 wild-born individuals, we present the first molecular genetic analyses focusing on the diversity and structure of the natural populations of the Jamaican boa. A model-based clustering analysis of multilocus microsatellite genotypes identifies three groups that are also significantly differentiated on the basis of F-statistics. Similarly, haplotypic network reconstruction methods applied on the cytochrome b haplotypes isolated here identify two well-differentiated haplogroups separated by four to six fixed mutations. Bayesian and metaGA analyses of the mitochondrial data set combined with sequences from other Boidae species indicate that rooting of the haplotypic network occurs most likely between the two defined haplogroups. Both analyses (based on nuclear and mitochondrial markers) underline an Eastern vs. (Western + Central) pattern of differentiation in agreement with geological data and patterns of differentiation uncovered in other vertebrate and invertebrate Jamaican species. Our results provide important insights for improving management of ex-situ captive populations and for guiding the development of proper in-situ species survival and habitat management plans for this spectacular, yet poorly known and vulnerable, snake.

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“…To date only four published studies have used genetic data to investigate sex-biased dispersal in snakes, all of which have found a male-bias (Rivera et al, 2006;Keogh et al, 2007;Clark et al, 2008;Dubey et al, 2008). Malebiased dispersal in mammalian species has been attributed to a female-defence polygyny mating system (Greenwood, 1980), and while polygyny has been regarded as typical for snakes (Duvall et al, 1993), more Smooth snake molecular ecology AP Pernetta et al recent research suggests that this may not always be the case (Rivas and Burghardt, 2005).…”

Section: Discussionmentioning

confidence: 99%

Fine-scale population genetic structure and sex-biased dispersal in the smooth snake (Coronella austriaca) in southern England

et al. 2011

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Human-induced alteration of natural habitats has the potential to impact on the genetic structuring of remnant populations at multiple spatial scales. Species from higher trophic levels, such as snakes, are expected to be particularly susceptible to land-use changes. We examined fine-scale population structure and looked for evidence of sex-biased dispersal in smooth snakes (Coronella austriaca), sampled from 10 heathland localities situated within a managed coniferous forest in Dorset, United Kingdom. Despite the limited distances between heathland areas (maximum o6 km), there was a small but significant structuring of populations based on eight microsatellite loci. This followed an isolation-bydistance model using both straight line and 'biological' distances between sampling sites, suggesting C. austriaca's low vagility as the causal factor, rather than closed canopy conifer forest exerting an effect as a barrier to dispersal. Within population comparisons of male and female snakes showed evidence for sex-biased dispersal, with three of four analyses finding significantly higher dispersal in males than in females. We suggest that the fine-scale spatial genetic structuring and sex-biased dispersal have important implications for the conservation of C. austriaca, and highlight the value of heathland areas within commercial conifer plantations with regards to their future management.

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Sex‐biased dispersal and high levels of gene flow among local populations in the argentine boa constrictor, Boa constrictor occidentalis

Cited by 36 publications

References 31 publications

Restricted dispersal and genetic diversity in populations of an endangered montane lizard (Eulamprus leuraensis, Scincidae)

Restricted dispersal and genetic diversity in populations of an endangered montane lizard (Eulamprus leuraensis, Scincidae)

Population structure of an endemic vulnerable species, the Jamaican boa (Epicrates subflavus)

Fine-scale population genetic structure and sex-biased dispersal in the smooth snake (Coronella austriaca) in southern England

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