Density Dynamics of a Threatened Species of Darter at Spatial and Temporal Scales

Wine, Mitchell S.; Weston, Michael R.; Johnson, Ronald L.

doi:10.1656/1528-7092-7.4.665

Cited by 6 publications

(4 citation statements)

References 29 publications

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“…For example, the Snail Darter ( P. tanasi ; Etnier, 1975), is a species endemic to the UTRB that also declined due to the 20th century “damming boom” in the basin (Etnier, 1975; Starnes, 1977). The Yellowcheek Darter ( Nothonotus moorei Raney & Suttkus, 1964) is another species that declined in its distribution due to damming of the Little Red River in Arkansas (Wine et al., 2008). Future conservation measures of the Sickle Darter should consider removal of small, low‐head dams in the sub‐basins within then UTRB.…”

Section: Discussionmentioning

confidence: 99%

“…Wine et al. (2008) assessed temporal changes in the abundance of the Yellowcheek Dater ( Nothonotus moorei Raney & Suttkus, 1964) in the Little Red River basin of Arkansas, where they compared site‐densities over a 25‐year period. Their estimates of site‐density for the Yellowcheek Darter were highly variable due to variation in sampling effort towards this species over the temporal scale explored (Wine et al., 2008).…”

Section: Discussionmentioning

confidence: 99%

“…(2008) assessed temporal changes in the abundance of the Yellowcheek Dater ( Nothonotus moorei Raney & Suttkus, 1964) in the Little Red River basin of Arkansas, where they compared site‐densities over a 25‐year period. Their estimates of site‐density for the Yellowcheek Darter were highly variable due to variation in sampling effort towards this species over the temporal scale explored (Wine et al., 2008). We experienced similar results in variability of sampling effort when compiling occurrence data for the Sickle Darter, as this species was mainly observed as part of community fish sampling, with no targeted sampling efforts.…”

Section: Discussionmentioning

confidence: 99%

“…Another species, the Snail Darter, has benefitted from changes in river operations and improved water quality (Williams & Plater, 2019). The Snail Darter has experience population increases and was recently petitioned for delisting from the Endangered Species Act (Williams & Plater, 2019) However, it is unknown if a self-sustaining population has been established there. The recovery of the Lake Sturgeon and the Snail Darter provide hope for reconnecting fragmented populations of declining species like the Sickle Darter.…”

Section: F I G U R Ementioning

confidence: 99%

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Spatiotemporal assessment of Sickle Darter ( Percina williamsi Page and Near, 2007) distribution in the upper Tennessee River Basin

Hecke

Alford

2021

J Appl Ichthyol

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The Sickle Darter Percina williamsi (Page and Near, 2007) is a species of fish endemic to the upper Tennessee River basin in eastern Tennessee, southwestern Virginia, and western North Carolina. Because of its narrow range and presumed decline in occupied sites over the last half century, it is being proposed for federal listing under the Endangered Species Act. We analyzed the current distribution of the Sickle Darter and temporal trends in its distribution in relation to temporal trends in environmental and habitat covariates for each of the historically occupied sub‐basins (upper Clinch, Emory, upper French Broad, Little, Little Pigeon, Middle Fork Holston, North Fork Holston, Powell, South Fork Holston, and Watauga) with multiple linear regression modelling. A total of 154 Sickle Darters were observed at 15 sites throughout the upper Tennessee River Basin. Sickle Darters were observed in the Little River, Emory River, and Middle Fork Holston River sub‐basins. A total of 133 unique historical occurrences were used for the spatiotemporal analyses. Sickle Darters have declined in 8 out of 10 historically occupied sub‐basins. Our best model for the whole distribution scale (Mallow's Cp = −0.87; Adjusted R2 = .92) suggests that habitat fragmentation due to damming has had adverse effects on Sickle Darter populations across its distribution. Models were very similar for the sub‐basin specific models as well. The results from this study highlight the drivers of decline in Sickle Darter distribution and outline the future research needs for this species that should be used to inform future conservation decisions regarding this species.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%