Genetic Consequences of Polygyny and Social Structure in an Indian Fruit Bat, Cynopterus Sphinx. I. Inbreeding, Outbreeding, and Population Subdivision

Storz, Jay F.; Bhat, H. R.; Kunz, Thomas

doi:10.1111/j.0014-3820.2001.tb00641.x

Cited by 58 publications

(55 citation statements)

References 62 publications

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“…These results are in line with previous studies [78], [79], [80], [81]. In particular, in Pacific salmon species with their high fecundity, variation in reproductive success can have a substantial impact on the reduction of demographic N e /N a [2], [10], [13], [25], [26].…”

Section: Discussionsupporting

confidence: 91%

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Can Genetic Estimators Provide Robust Estimates of the Effective Number of Breeders in Small Populations?

Hoehn¹,

Gruber²,

Sarre³

et al. 2012

PLoS ONE

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The effective population size (Ne) is proportional to the loss of genetic diversity and the rate of inbreeding, and its accurate estimation is crucial for the monitoring of small populations. Here, we integrate temporal studies of the gecko Oedura reticulata, to compare genetic and demographic estimators of Ne. Because geckos have overlapping generations, our goal was to demographically estimate NbI, the inbreeding effective number of breeders and to calculate the NbI/Na ratio (Na = number of adults) for four populations. Demographically estimated NbI ranged from 1 to 65 individuals. The mean reduction in the effective number of breeders relative to census size (NbI/Na) was 0.1 to 1.1. We identified the variance in reproductive success as the most important variable contributing to reduction of this ratio. We used four methods to estimate the genetic based inbreeding effective number of breeders NbI(gen) and the variance effective populations size NeV(gen) estimates from the genotype data. Two of these methods - a temporal moment-based (MBT) and a likelihood-based approach (TM3) require at least two samples in time, while the other two were single-sample estimators - the linkage disequilibrium method with bias correction LDNe and the program ONeSAMP. The genetic based estimates were fairly similar across methods and also similar to the demographic estimates excluding those estimates, in which upper confidence interval boundaries were uninformative. For example, LDNe and ONeSAMP estimates ranged from 14–55 and 24–48 individuals, respectively. However, temporal methods suffered from a large variation in confidence intervals and concerns about the prior information. We conclude that the single-sample estimators are an acceptable short-cut to estimate NbI for species such as geckos and will be of great importance for the monitoring of species in fragmented landscapes.

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Section: Discussionsupporting

confidence: 91%

“…The effect of the mating system (especially polygyny) on N e has been studied both theoretically [78], [82] and empirically [75], [79], [80], [83]. In feral cat populations for example, estimates of N e /N a were higher in a promiscuous cat population (42%) than in a polygynous one (33%) [75].…”

Section: Discussionmentioning

confidence: 99%

Can Genetic Estimators Provide Robust Estimates of the Effective Number of Breeders in Small Populations?

Hoehn¹,

Gruber²,

Sarre³

et al. 2012

PLoS ONE

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show abstract

“…Similarly, genetic drift in small populations also will decrease observed heterozygote frequencies and compound any potential effects of mating among relatives. In contrast, a high degree of polygyny and male-biased dispersal will cause heterozygote excess and result in measurements of negative F IS values (Prout 1981;Chesser 1991a, b;Stortz et al 2001).…”

Section: Inference About Social Structurementioning

confidence: 99%

Population structure and genetic variation in the endangered Giant Kangaroo Rat (Dipodomys ingens)

et al. 2005

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Populations of the endangered giant kangaroo rat, Dipodomys ingens (Heteromyidae), have suffered increasing fragmentation and isolation over the recent past, and the distribution of this unique rodent has become restricted to 3% of its historical range. Such changes in population structure can significantly affect effective population size and dispersal, and ultimately increase the risk of extinction for endangered species.To assess the fine-scale population structure, gene flow, and genetic diversity of remnant populations of Dipodomys ingens, we examined variation at six microsatellite DNA loci in 95 animals from six populations. Genetic subdivision was significant for both the northern and southern part of the kangaroo rat's range although there was considerable gene flow among southern populations. While regional gene diversity was relatively high for this endangered species, hierarchical F-statistics of northern populations in Fresno and San Benito counties suggested non-random mating and genetic drift within subpopulations. We conclude that effective dispersal, and therefore genetic distances between populations, is better predicted by ecological conditions and topography of the environment than linear geographic distance between populations. Our results are consistent with and complimentary to previous findings based on mtDNA variation of giant kangaroo rats. We suggest that management plans for this endangered rodent focus on protection of suitable habitat, maintenance of connectivity, and enhancement of effective dispersal between populations either through suitable dispersal corridors or translocations.

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“…Negative F IS scores are relatively uncommon in the literature and in vertebrates are most associated with polygynous social mammals such as bats or prairie dogs (Storz 1999;Storz et al 2001). In these cases, negative F IS scores result from male dispersal, female philopatry, polygyny, and active avoidance of mating among kin.…”

Section: Excess Heterozygositymentioning

confidence: 99%

Genetic effects of habitat fragmentation and population isolation on Etheostoma raneyi (Percidae)

et al. 2012

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The use of genetic methods to quantify the effects of anthropogenic habitat fragmentation on population structure has become increasingly common. However, in today's highly fragmented habitats, researchers have sometimes concluded that populations are currently genetically isolated due to habitat fragmentation without testing the possibility that populations were genetically isolated before European settlement. Etheostoma raneyi is a benthic headwater fish restricted to river drainages in northern Mississippi, USA, that has a suite of adaptive traits that correlate with poor dispersal ability. Aquatic habitat within this area has been extensively modified, primarily by flood-control projects, and populations in headwater streams have possibly become genetically isolated from one another. We used microsatellite markers to quantify genetic structure as well as contemporary and historical gene flow across the range of the species. Results indicated that genetically distinct populations exist in each headwater stream analyzed, current gene flow rates are lower than historical rates, most genetic variation is partitioned among populations, and populations in the Yocona River drainage show lower levels of genetic diversity than populations in the Tallahatchie River drainage and other Etheostoma species. All populations have negative F IS scores, of which roughly half are significant relative to Hardy-Weinberg expectations, perhaps due to small population sizes. We conclude that anthropogenic habitat alteration and fragmentation has had a profoundly negative impact on the species by isolating E. raneyi within headwater stream reaches. Further research is needed to inform conservation strategies, but populations in the Yocona River drainage are in dire need of management action. Carefully planned human-mediated dispersal and habitat restoration should be explored as management options across the range of the species.

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Genetic Consequences of Polygyny and Social Structure in an Indian Fruit Bat, Cynopterus Sphinx. I. Inbreeding, Outbreeding, and Population Subdivision

Cited by 58 publications

References 62 publications

Can Genetic Estimators Provide Robust Estimates of the Effective Number of Breeders in Small Populations?

Can Genetic Estimators Provide Robust Estimates of the Effective Number of Breeders in Small Populations?

Population structure and genetic variation in the endangered Giant Kangaroo Rat (Dipodomys ingens)

Genetic effects of habitat fragmentation and population isolation on Etheostoma raneyi (Percidae)

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