Conservation genetic assessment of the paleback darter, <scp><i>Etheostoma pallididorsum</i></scp>, a narrowly distributed endemic in the Ouachita Highlands, Arkansas, USA

McCall, Brittany L.; Fluker, Brook L.

doi:10.1002/aqc.3510

Cited by 6 publications

(3 citation statements)

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“…Although not directly comparable due to variations in loci used, our H o measures were much lower than the average H o for several Etheostoma at 0.735 (Sterling et al., 2012), as well as many other threatened and endangered darters such as Okaloosa Darter, Etheostoma okaloosa , at 0.599 (0.000–0.950; Austin et al., 2011), Watercress Darter, Etheostoma nuchale , at 0.671 (0.652–0.702; Fluker et al., 2010) and Roanoke Logperch, Percina rex , at 0.699 (0.448–0.837; Roberts et al., 2013). Average allelic richness ( A R ) among E. spilotum populations was also low at 3.96 (3.65–4.74) compared to other species of concern such as E. nuchale at 5.224 (4.41–6.28; Fluker et al., 2010) and E. pallidorsum at 4.16 (3.04–7.32; McCall & Fluker, 2021).…”

Section: Discussionmentioning

confidence: 99%

“…This level of population differentiation is higher than that observed in several other threatened and endangered darter species with similar range sizes (although not directly comparable due to variations in loci used), such as the Trispot Darter, Etheostoma trisella and Paleback Darter, Etheostoma pallididorsum . In both of these species, only three putative populations were found ( K = 3), and populations recovered were separated by reservoirs with multiple panmictic tributaries making up some populations (Fast et al., 2023; McCall & Fluker, 2021).…”

Section: Discussionmentioning

confidence: 99%

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Instream barriers contribute to population isolation of a small‐bodied, benthic, headwater‐specialist fish (Percidae)

Watson,

Culley,

Haase

et al. 2024

Ecology of Freshwater Fish

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Genetic differentiation in aquatic systems is often driven by geographic distance (isolation by distance) due to the linear and hierarchical distribution of populations, but habitat fragmentation often exacerbates this effect by decreasing population connectivity, leading to isolation by resistance. Stronghold populations of the Kentucky Arrow Darter (Etheostoma spilotum) in the South Fork Kentucky River system within the Daniel Boone National Forest of eastern Kentucky, USA have a high population structure not explained by distance alone. Higher than expected levels of genetic differentiation among proximate populations were hypothesized to be driven by land‐use change, but this was not previously tested. Here we use a riverscape genetics approach to test for the effects of natural landscape features including slope, elevation and stream size, and anthropogenically altered habitat features, including specific conductance (conductivity), culverts and forest cover, on population connectivity and genetic diversity of E. spilotum. We found isolation of populations among all tributary systems and a strong, positive relationship between genetic and geographic distances as expected. However, high conductivity levels due to surface coal mining best explain the population structure observed. We also found signatures of low genetic diversity overall and indicators that culverts may limit upstream movements of E. spilotum. This study provides a novel fine‐scale view of the effects of instream and landscape features on connectivity among, and genetic diversity within populations of an imperilled, small‐bodied, benthic fish.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Instream barriers contribute to population isolation of a small‐bodied, benthic, headwater‐specialist fish (Percidae)

Watson,

Culley,

Haase

et al. 2024

Ecology of Freshwater Fish

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show abstract

“…Etheostoma species are not well represented in the fossil record (Bailey and Smith 1981); therefore, previous estimates of molecular divergence in darters that have used Centrarchid fossil records for calibration for divergence dating were used here (e.g., Near et al 2011, Bossu et al 2013, Fluker et al 2014). The substitution rate was estimated by Near et al (2011) from the mitochondrial cytochrome b (cytb) gene as 8.99x10 -3 , and this has been applied in recent estimates of molecular divergence in Etheostoma species (Echelle et al 2015, McCall and Fluker 2021, MacGuigan et al 2023. Although this rate may result in an underestimate of divergence time for ND2 as ND2 evolves at a faster rate than cytb (Mueller 2006), it is the best available rate for estimating divergence time from mitochondrial genes in Etheostoma species and was therefore used as the substitution rate in this analysis.…”

Section: Methodsmentioning

confidence: 99%

CONTRASTING THE ROLE OF HISTORIC FACTORS IN PHYLOGEOGRAPIC PATTERNS IN THE NATIVE JOHNNY DARTER (Etheostoma nigrum) AND INVASIVE ROUND GOBY (Neogobius melanostomus) IN LOWER MICHIGAN

Wicks,

Bowman,

Dowling

2024

Preprint

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Round goby (Neogobius melanostomus) is an invasive fish present in all five Great Lakes and is becoming increasingly common in their tributaries. Johnny darter (Etheostoma nigrum) is a native species that often coexists with N. melanostomus. In this work, historic factors are addressed as a source of genomic variation in study populations of these species. To do this, patterns of variation in the mitochondrial gene NADH dehydrogenase subunit 2 (ND2) were characterized for both species throughout Lower Michigan. Populations of N. melanostomus and E. nigrum were sampled from 17 localities representing both eastern and western basins of Lower Michigan to test the hypothesis that populations differ between the eastern and western basins of the Great Lakes. Neogobius melanostomus populations were largely homogenous with no significant differences detected among populations or between the eastern and western basins. Additionally, N. melanostomus exhibited no evidence of overarching historical genetic structure, consistent with the recent invasion and rapid expansion of this species. Etheostoma nigrum exhibited significant differentiation among local populations; however, similarity among mtDNA haplotypes indicated that differences among populations are recent, suggesting that local forces are a more important factor in shaping patterns of variation than historical factors. Contrary to predictions, there were no significant differences detected between the eastern and western basins of the Great Lakes; however, construction of a neighbor joining tree with F estimates revealed clustering of populations by basin with some anomalies. These anomalies may be the result of recent stream capture events facilitating gene flow between the two basins.

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Contrasting the role of historic factors in phylogeograpic patterns in the native Johnny darter (Etheostoma nigrum) and invasive round goby (Neogobius melanostomus) in lower michigan

Wicks,

Bowman,

Dowling

2024

Ecology and Evolution

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Round goby (Neogobius melanostomus) is an invasive fish present in all five Great Lakes and is becoming increasingly common in their tributaries. Johnny darter (Etheostoma nigrum) is a native species that often coexists with N. melanostomus. In this work, historic factors are addressed as a source of genomic variation in study populations of these species. To do this, patterns of variation in the mitochondrial gene NADH dehydrogenase subunit 2 (ND2) were characterized for both species throughout Lower Michigan. Populations of N. melanostomus and E. nigrum were sampled from 17 localities representing both eastern and western basins of Lower Michigan to test the hypothesis that populations differ between the eastern and western basins of the Great Lakes. Neogobius melanostomus populations were largely homogenous with no significant differences detected among populations or between the eastern and western basins. Additionally, N. melanostomus exhibited no evidence of overarching historical genetic structure, consistent with the recent invasion and rapid expansion of this species. Etheostoma nigrum exhibited significant differentiation among local populations; however, similarity among mtDNA haplotypes indicated that differences among populations are recent, suggesting that local forces are a more important factor in shaping patterns of variation than historical factors. Contrary to predictions, there were no significant differences detected between the eastern and western basins of the Great Lakes; however, construction of a neighbor‐joining tree with FST estimates revealed clustering of populations by basin with some anomalies. These anomalies may be the result of recent stream capture events facilitating gene flow between the two basins.

show abstract

Conservation genetic assessment of the paleback darter, Etheostoma pallididorsum, a narrowly distributed endemic in the Ouachita Highlands, Arkansas, USA

Cited by 6 publications

References 80 publications

Instream barriers contribute to population isolation of a small‐bodied, benthic, headwater‐specialist fish (Percidae)

Instream barriers contribute to population isolation of a small‐bodied, benthic, headwater‐specialist fish (Percidae)

CONTRASTING THE ROLE OF HISTORIC FACTORS IN PHYLOGEOGRAPIC PATTERNS IN THE NATIVE JOHNNY DARTER (Etheostoma nigrum) AND INVASIVE ROUND GOBY (Neogobius melanostomus) IN LOWER MICHIGAN

Contrasting the role of historic factors in phylogeograpic patterns in the native Johnny darter (Etheostoma nigrum) and invasive round goby (Neogobius melanostomus) in lower michigan

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