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

Hudman, Stephen P.; Gido, Keith B.

doi:10.1111/fwb.12079

Cited by 33 publications

(31 citation statements)

References 64 publications

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“…The letters state whether groups differed significantly from one another in one-sided t-tests assuming unequal variance of groups, after Holm's correction of P-values for multiple tests had been applied. These results are similar to those of Mitsui, Isagi & Setoguchi (2010), Kondo, Nakagoshi & Isagi (2009), Hudman & Gido (2013 and Van Looy et al (2009). This is different from what has been found for the riparian tree species black poplar (Smulders et al, 2008), a wind-pollinated and wind-dispersed species.…”

Section: Modelcontrasting

confidence: 50%

“…For aquatic species, several studies have found similar genetic isolation effects among populations separated by physical barriers (Horreo et al, 2011; 2012; Franssen, 2012;Hudman & Gido, 2013), but this issue has received less attention in riparian species. Moreover, Bayesian clustering revealed different populations on either side of physical barriers in all catchments.…”

Section: Modelmentioning

confidence: 99%

“…Various structures in a catchment may represent more or less strong barriers to gene movement (Alp et al, 2012;Hudman & Gido, 2013). We expect that canyons and channelised river segments function as semipermeable barriers, and neither one will completely impede the gene movement of riparian plants.…”

Section: Introductionmentioning

confidence: 99%

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Dams and canyons disrupt gene flow among populations of a threatened riparian plant

2014

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Summary Natural and man‐made barriers have a significant impact on the population structure and genetic diversity of aquatic species. Little is known whether terrestrial, riparian species are affected in the same way by barriers. Here, we analysed the genetic structure of a threatened riparian shrub based on 20 microsatellite markers and 1176 individuals collected from 34 localities in four Alpine rivers in Europe (Isar, Lech, Rhine and Tagliamento). The catchments comprised a variety of potential barriers to gene flow for terrestrial riparian plants: dams, channelised stretches of river and canyons. We compared the average level of genetic differentiation (pairwise FST) between connected localities and localities isolated by natural or man‐made barriers. Genetic differentiation was higher between localities isolated by a barrier than between connected localities, indicating genetic isolation caused by barriers. This increased degree of genetic differentiation across barriers was evident in geographic tree models. Our results demonstrate genetic isolation effects due to large dams in a characteristic plant of Central European floodplains, highlighting that these types of barriers may negatively impact riparian plant populations. We also found genetic isolation effects in populations separated by natural barriers (canyons). These results have important implications for understanding the dynamics of riparian plant populations and for designing suitable management strategies for an effective conservation of riparian plants.

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Section: Modelcontrasting

confidence: 50%

Section: Modelmentioning

confidence: 99%

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Dams and canyons disrupt gene flow among populations of a threatened riparian plant

2014

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“…For both F. validus and F. erichsonianus , gene flow from down‐ to upstream populations was lower in impounded streams compared to unimpounded streams, which is consistent with the expected response to stream habitat fragmentation (Fluker et al, ; Hudman & Gido, ; Meffe & Vrijenhoek, ). In contrast, crayfish populations in up‐ and downstream sections of unimpounded streams displayed high genetic connectivity and bidirectional dispersal and gene flow.…”

Section: Discussionsupporting

confidence: 78%

Crayfish populations genetically fragmented in streams impounded for 36–104 years

et al. 2019

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Dams and their associated impoundments may restrict dispersal and gene flow among populations of numerous freshwater species within stream networks, leading to genetic isolation. This can reduce effective population sizes and genetic diversity, increasing the risk of local extinction. We studied crayfishes from multiple up‐ and downstream sites in three impounded and two unimpounded streams in the Bear Creek and Cahaba River drainages, Alabama, U.S.A. Using mitochondrial DNA (cytochrome oxidase subunit I gene) sequence data generated from population‐level sampling of two abundant native crayfishes, Faxonius validus and Faxonius erichsonianus (Decapoda: Cambaridae), we assessed species’ spatial genetic structure and genetic diversity, estimated the magnitude and directionality of gene flow, and compared results between the species. For both species, levels of genetic diversity (number of haplotypes, and haplotypic and nucleotide diversity) were the same or higher in impounded compared to unimpounded streams. Conversely, crayfish populations in up‐ and downstream sections of unimpounded streams displayed high genetic similarity and bidirectional gene flow, whereas in impounded streams, crayfish populations typically had greater up‐ and downstream genetic differentiation and predominantly unidirectional, downstream gene flow. Although impoundments were associated with lower connectivity between up‐ and downstream sections for F. validus and F. erichsonianus, the magnitude of genetic effects was species‐specific, with greater differentiation between F. validus populations up‐ and downstream of impoundments. In an ecologically short timeframe, impoundments appear to have fragmented stream crayfish populations, and even species with relatively high abundances and large ranges had lower gene flow among populations in impounded streams compared to unimpounded streams. In addition, feedbacks between genetic and demographic effects on fragmented populations may decrease the probability of long‐term persistence.

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“…Collectively, the results from this study and a recent body of work on similar stream‐inhabiting fishes (i.e. Skalski et al ., ; Franssen, ; Hudman & Gido, ) suggest that reservoir‐induced fragmentation can affect gene flow and genetic structure in stream fishes over relatively brief timescales.…”

Section: Discussionmentioning

confidence: 99%

The effects of riverine impoundment on genetic structure and gene flow in two stream fishes in the Mobile River basin

2013

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Summary Riverine impoundments (reservoirs) are thought to impede natural migration in small‐stream‐inhabiting fishes, resulting in spatially and genetically fragmented populations. However, this hypothesis remains poorly tested, and the genetic consequences of riverine impoundment for stream fishes with differing dispersal capabilities are not well understood. This study utilised a combination of microsatellite DNA loci from 479 individuals and the mitochondrial (mt) DNA cytochrome b gene (810–1140 bp) from 83 individuals from eight streams to compare genetic structure and diversity between reservoir‐fragmented and non‐fragmented groups of two species of stream fishes with differing dispersal capabilities in the Mobile River basin of the south‐eastern United States. For both species, analysis of microsatellite loci revealed genetic discontinuities between neighbouring tributaries that have been fragmented by reservoir construction. This finding was in stark contrast to the high degree of continuity for both species between reference tributaries in a natural river setting. Results from mtDNA revealed no significant genetic structure within reservoir‐fragmented or non‐fragmented groups, indicating a lack of historical genetic structure (i.e. prior to reservoir construction). Microsatellite‐based estimates of genetic diversity and migration were differentially affected in the two species, indicating that stream fishes with relatively high dispersal abilities may be equally or more susceptible to reservoir fragmentation when compared to species with relatively low dispersal abilities. Collectively, our data revealed that riverine impoundment and reservoir‐induced habitat fragmentation adversely affect genetic characteristics in small‐stream‐inhabiting fishes. This is of particular interest in biodiversity hotspots such as the south‐eastern United States where hydroelectric and recreational reservoirs restrict connectivity in aquatic systems.

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

Cited by 33 publications

References 64 publications

Dams and canyons disrupt gene flow among populations of a threatened riparian plant

Dams and canyons disrupt gene flow among populations of a threatened riparian plant

Crayfish populations genetically fragmented in streams impounded for 36–104 years

The effects of riverine impoundment on genetic structure and gene flow in two stream fishes in the Mobile River basin

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