Search results for: Stuart A. Welsh

Items from 1 to 12 out of 12 results

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Genetic swamping and possible species collapse: tracking introgression between the native Candy Darter and introduced Variegate Darter

Isaac Gibson, Amy B. Welsh, Stuart A. Welsh, Daniel A. Cincotta

Conservation Genetics > 2019 > 20 > 2 > 287-298

Candy Darters (Etheostoma osburni) and Variegate Darters (E. variatum) are both native to West Virginia and Virginia. The geographic ranges of these two species were historically separated by Kanawha Falls, a natural barrier to fish dispersal located at Glen Ferris, WV. In the early 1980s, Variegate Darters or putative hybrids (E. osburni × E. variatum) were first collected at locations upstream of...

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Spatial extent of analysis influences observed patterns of population genetic structure in a widespread darter species (Percidae)

Jane E. Argentina, Paul L. Angermeier, Eric M. Hallerman, Stuart A. Welsh

Freshwater Biology > 63 > 10 > 1185 - 1198

Connectivity among stream fish populations allows for exchange of genetic material and helps maintain genetic diversity, adaptive potential and population stability over time. Changes in species demographics and population connectivity have the potential to permanently alter the genetic patterns of stream fish, although these changes through space and time are variable and understudied in small‐bodied...

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Evaluation of physicochemical and physical habitat associations for Cambarus callainus (Big Sandy crayfish), an imperilled crayfish endemic to the Central Appalachians

Zachary J. Loughman, Stuart A. Welsh, Nicole M. Sadecky, Zachary W. Dillard, more

Aquatic Conservation: Marine and Freshwater Ecosystems > 27 > 4 > 755 - 763

1. Crayfish represent one of the most imperilled animal groups on the planet. Habitat degradation, destruction and fragmentation, introduction of invasive crayfishes, and a lack of applied biological information have all been identified as agents thwarting crayfish conservation. 2. Cambarus callainus was warranted federal protection by the United States Fish and Wildlife Service (USFWS) in April,...

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Diel periodicity and chronology of upstream migration in yellow-phase American eels (Anguilla rostrata)

Joni L. Aldinger, Stuart A. Welsh

Environmental Biology of Fishes > 2017 > 100 > 7 > 829-838

Yellow-phase American eel (Anguilla rostrata) upstream migration is temporally punctuated, yet migration chronology within diel time periods is not well-understood. This study examined diel periodicity, chronology, and total length (TL) of six multi-day, high-count (285–1,868 eels) passage events of upstream migrant yellow-phase American eels at the Millville Dam eel ladder, lower Shenandoah River,...

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Physical habitat and water quality correlates of crayfish distributions in a mined watershed

Stuart A. Welsh, Zachary J. Loughman

Hydrobiologia > 2015 > 745 > 1 > 85-96

In mined watersheds, water quality alters aquatic faunas, but few studies have focused on associations between stream habitat and crayfish distributions. We examined associations of water quality and physical habitat quality on presence/absence of six crayfish species in the upper Kanawha River drainage of southern West Virginia, USA, a region with a long history of surface and mountaintop removal...

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Microhabitat use of the diamond darter

Stuart A. Welsh, Dustin M. Smith, Nate D. Taylor

Ecology of Freshwater Fish > 22 > 4 > 587 - 595

The only known extant population of the diamond darter (Crystallaria cincotta) exists in the lower 37 km of Elk River, WV, USA. Our understanding of diamond darter habitat use was previously limited, because few individuals have been observed during sampling with conventional gears. We quantified microhabitat use of diamond darters based on measurements of water depth, water velocity and per cent...

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Advantages of Geographically Weighted Regression for Modeling Benthic Substrate in Two Greater Yellowstone Ecosystem Streams

Kenneth R. Sheehan, Michael P. Strager, Stuart A. Welsh

Environmental Modeling & Assessment > 2013 > 18 > 2 > 209-219

Stream habitat assessments are commonplace in fish management, and often involve nonspatial analysis methods for quantifying or predicting habitat, such as ordinary least squares regression (OLS). Spatial relationships, however, often exist among stream habitat variables. For example, water depth, water velocity, and benthic substrate sizes within streams are often spatially correlated and may exhibit...

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Available benthic habitat type may influence predation risk in larval lampreys

Dustin M. Smith, Stuart A. Welsh, Philip J. Turk

Ecology of Freshwater Fish > 21 > 1 > 160 - 163

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Selection and preference of benthic habitat by small and large ammocoetes of the least brook lamprey (Lampetra aepyptera)

Dustin M. Smith, Stuart A. Welsh, Philip J. Turk

Environmental Biology of Fishes > 2011 > 91 > 4 > 421-428

In this laboratory study, we quantified substrate selection by small (<50 mm) and large (100–150 mm) ammocoetes of the least brook lamprey (Lampetra aepyptera). In aquaria, ammocoetes were given a choice to burrow into six equally-available substrate types: small gravel (2.360–4.750 mm), coarse sand (0.500–1.400 mm), fine sand (0.125–0.500 mm), organic substrate (approximately 70% decomposing leaves/stems...

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Response of benthic macroinvertebrate communities to highway construction in an Appalachian watershed

Lara B. Hedrick, Stuart A. Welsh, James T. Anderson, Lian-Shin Lin, more

Hydrobiologia > 2010 > 641 > 1 > 115-131

Highway construction in mountainous areas can result in sedimentation of streams, negatively impacting stream habitat, water quality, and biotic communities. We assessed the impacts of construction of a segment of Corridor H, a four-lane highway, in the Lost River watershed, West Virginia, by monitoring benthic macroinvertebrate communities and water quality, before, during, and after highway construction...

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Threatened fishes of the world: Crystallaria cincotta Welsh and Wood 2008 (Percidae)

Stuart A. Welsh, Robert M. Wood, Kenneth R. Sheehan

Environmental Biology of Fishes > 2009 > 84 > 2 > 191-192

article

Habitat partitioning in a community of darters in the Elk River, West Virginia

Stuart A. Welsh, Sue A. Perry

Environmental Biology of Fishes > 1998 > 51 > 4 > 411-419

Microhabitat use and habitat partitioning for 10 darter species (Percidae: Etheostomatini) were studied by direct observation (snorkeling) at five sites in the Elk River drainage, West Virginia, U.S.A. We used canonical discriminant analysis and univariate tests to determine microhabitat variables that were important in segregating species. Darter species were segregated by depth, substrate size,...

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