Genetic estimates of population structure and dispersal in a benthic stream fish

Lamphere, Bradley A.; Blum, Michael J.

doi:10.1111/j.1600-0633.2011.00525.x

Cited by 39 publications

(32 citation statements)

References 93 publications

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“…The finding of significant isolation by distance may reflect lingering effects of historic dispersal and genetic structure and is not a surprising result for a small, benthic, headwater fish (Johnson 2007;Beneteau et al 2009;Lamphere andBlum 2012, however, see Turner andTrexler 1998). Partitioning of most genetic variation among populations, rather than among watersheds, is also not surprising given the significant F ST scores between all populations and significant genic population differentiation.…”

Section: Genetic Diversity and Population Structurementioning

confidence: 80%

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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Section: Genetic Diversity and Population Structurementioning

confidence: 80%

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

et al. 2012

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“…Yet even this study suffered low detection probabilities that downwardly biased movement estimates . These discrepancies between direct and indirect estimates of mobility may partially result from differences in the spatiotemporal extents of studies (Lamphere & Blum, 2012). These discrepancies between direct and indirect estimates of mobility may partially result from differences in the spatiotemporal extents of studies (Lamphere & Blum, 2012).…”

Section: Spatial Scale Of Population Structurementioning

confidence: 99%

“…In contrast, many small-bodied, benthic warm-water fishes undergo comparably minor ontogenetic shifts in habitat needs, which can be accommodated via localized movements (Winn, 1958;Hall, 1972;Rosenberger & Angermeier, 2003;Roberts & Angermeier, 2007), seemingly obviating extensive migration or dispersal. H€ anfling & Weetman, 2006;Beneteau et al, 2009;Lamphere & Blum, 2012;Sterling et al, 2012). Unfortunately, mark-recapture data seldom are useful for testing this assumption, due to the limited spatiotemporal scope of such studies (Fausch et al, 2002).…”

Section: Implications For Ecology and Conservationmentioning

confidence: 99%

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Distance, dams and drift: what structures populations of an endangered, benthic stream fish?

2013

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Summary Spatial population structure plays an important role in species persistence, evolution and conservation. Benthic stream fishes are diverse and frequently imperilled, yet the determinants and spatial scaling of their population structure are understudied. We investigated the range‐wide population genetic structure of Roanoke logperch (Percina rex), an endangered, benthic stream fish of the eastern United States. Fish were sampled from 35 sites and analysed at 11 microsatellite DNA loci. Clustering models were used to sort individuals into genetically cohesive groups and thereby estimate the spatial scaling of population structure. We then used Bayesian generalized linear mixed models (BGLMMs) to test alternative hypotheses about the environmental factors most responsible for generating structure, as measured by the differentiation statistic FST. Clustering models delineated seven discrete populations, whose boundaries coincided with agents of fragmentation, including hydroelectric dams and tailwaters. In the absence of hydrological barriers, gene flow was extensive throughout catchments, whereas there was no evidence for contemporary dispersal between catchments across barriers. In the best‐supported BGLMM, FST was positively related to the spatial distance and degree of hydrological alteration between sites and negatively related to genetic diversity within sites. Whereas the effect of tailwaters was equivocal, dams strongly influenced differentiation: the effect of a dam on FST was comparable to that of a between‐site distance of over 1200 km of unimpounded river. Overall, the effect of distance‐mediated dispersal was negligible compared to the combined effects of fragmentation and genetic drift. The contemporary population structure of P. rex comprises a few geographically extensive ‘islands’ that are fragmented by hydroelectric projects. This information clarifies the importance of a catchment‐scale perspective on conserving the species and suggests that its recovery may require genetic and/or demographic reconnection of presently isolated populations.

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“…These disruptions may result in reduced local population size and increased extinction probability if preferred habitat becomes unavailable or inaccessible. For example, Lamphere & Blum (2012) found limited dispersal of a benthic dwelling fish over a relatively small distance (<5 km). Although dams, irrigation diversions and other waterway alterations are common features in contemporary aquatic systems (Benke, 1990), the genetic effects of fragmentation in running water habitats has been restricted to a limited number of taxa, many of which occur in mainstem habitats (e.g.…”

Section: Introductionmentioning

confidence: 99%

Multi‐scale effects of impoundments on genetic structure of creek chub (Semotilus atromaculatus) in the Kansas River basin

Hudman¹,

Gido²

2012

Freshwater Biology

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Summary 1. Habitat fragmentation has been implicated as a primary cause for the ongoing erosion of global biodiversity, yet our understanding of the consequences in lotic systems is limited for many species and regions. Because of harsh environmental conditions that select for high colonisation rates, prairie stream fishes may be particularly vulnerable to the effects of fragmentation. Hence, there is urgent need for broader understanding of fragmentation in prairie streams such that meaningful conservation strategies can be developed. Further, examination at large spatial scales, including multiple impoundments and un‐impounded catchments, will help identify the spatial extent of species movement through the landscape. 2. Our study used data from 10 microsatellite loci to describe the genetic structure of creek chub (Semotilus atromaculatus) populations across four catchments (three impounded and one un‐impounded) in the Kansas River basin. We investigated whether genetic diversity was eroded in response to habitat fragmentation imposed by reservoirs and whether intervening lentic habitat increased resistance to dispersal among sites within a catchment. 3. Our analyses revealed that genetic diversity estimates were consistent with large populations regardless of the location of the sampled tributaries, and there was little evidence of recent population reductions. Nevertheless, we found a high degree of spatial genetic structure, suggesting that catchments comprise a set of isolated genetic units and that sample sites within catchments are subdivided into groups largely defined by intervening habitat type. Our data therefore suggest that lentic habitat is a barrier to dispersal among tributaries, thus reducing the opportunity for genetic rescue of populations in tributaries draining into reservoirs. Isolation by a reservoir, however, may not be immediately deleterious if the isolated tributary basin supports a large population.

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Genetic estimates of population structure and dispersal in a benthic stream fish

Cited by 39 publications

References 93 publications

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

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

Distance, dams and drift: what structures populations of an endangered, benthic stream fish?

Multi‐scale effects of impoundments on genetic structure of creek chub (Semotilus atromaculatus) in the Kansas River basin

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