Extirpation of the Bridle Shiner (<i>Notropis bifrenatus</i>) from Maryland

Kilian, Jay V.; Raesly, Richard L.; Stranko, Scott A.; Becker, Andrew; Durell, Eric Q.

doi:10.1656/045.018.0210

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…After extensive collection efforts in areas of historical occurrence since 1984 resulted in no Bridle Shiners. The extirpation of the Bridle Shiner in Maryland has now been reported [44].…”

Section: Introductionmentioning

confidence: 97%

“…Several factors including habitat alteration, losses of stream vegetation, urbanization, industrialization, water diversion, industrial and sewage plant discharges, and increased turbidity and sedimentation have all been implicated for these population declines [31,43]. The exact cause of the extirpation was unknown but declines in other regions have been attributed to increased sedimentation, the constant loss of native aquatic vegetation, the increase in non-native plants including Hydrilla verticillata (Hydrilla) and Myriophyllum spicatum (Eurasian Watermilfoil), and the increase of non-native predators including Micropterus nigricans (Largemouth Bass) and Ictalurus punctatus (Channel Catfish) [44]. Populations of Bridle Shiners in Virginia have been localized (i.e., the James River drainage) and some populations have been extirpated or nearly so (e.g., the Potomac River drainage and the Rappahannock River drainage) [39,45].…”

Section: Introductionmentioning

confidence: 99%

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Sustainability of Biodiversity: Use of a NetWeaver Tool to Identify Suitable Sites for Reintroduction of Fishes

2024

Rep Glob Health Res

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Attempts have been made to reintroduce extirpated fauna to their native ranges to increase biotic diversity, biotic resistance, and sustainability of aquatic communities. Herein, we use a Net Weaver Model to test the suitability of putative reintroduction cites of Notropis bifrenatus (Cope) (Bridle Shiner) and Notropis chalybaeus (Cope) (Ironcolor Shiner), which have been extirpated throughout most of their historic range. These two species co-exist in Marshalls Creek (Delaware River drainage), Monroe County, Pennsylvania. Although both species were historically widespread, the only known extant populations where these endangered shiners occur syntopically is in Marshalls Creek. The research goal was to determine the unique aquatic habitat characters of Marshalls Creek that support the syntopic populations of Bridle and Ironcolor shiners. To achieve this goal, research objectives were (1) to examine and discern the aquatic habitat characters (i.e., the combination and interaction of biological, chemical, and physical habitat characters) that are coincident with these shiners in Marshalls Creek; (2) to determine if these aquatic habitat characters are commonly found at other historical sites for these shiners; and (3) to speculate as to why these shiners are syntopic in Marshalls Creek. A NetWeaver model was developed to examine aquatic habitat characters of Marshalls Creek research sites and other historical sites on the Atlantic seaboard. NetWeaver model network components were utilized to produce strength of evidence scores (i.e., trueness levels) to compare, contrast, and evaluate aquatic habitat characters to the reference (i.e., benchmark) aquatic habitat characters in Marshalls Creek. This study provided important data relative to these shiners and methodology for scientists and resource managers to assess biodiversity and evaluate potential sites for reintroductions of fishes.

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“…After extensive collection efforts in areas of historical occurrence since 1984 resulted in no Bridle Shiners. The extirpation of the Bridle Shiner in Maryland has now been reported [44].…”

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Sustainability of Biodiversity: Use of a NetWeaver Tool to Identify Suitable Sites for Reintroduction of Fishes

2024

Rep Glob Health Res

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“…For instance, the species has been extirpated in parts of the USA (e.g. Maryland; Kilian, Raesly, Stranko, Becker, & Decker, 2011), and is listed as being of 'special concern' throughout Canada (Committee on the Status of Endangered Wildlife in Canada (COSEWIC), 2014). Little research has investigated the causes of the decline, but there is speculation that it may result from habitat degradation or changes in predator assemblages over time (Sabo, 2000;Whittier et al, 1997).…”

mentioning

confidence: 99%

Landscape factors predict local extirpation in an imperilled minnow species, the bridle shiner (Notropis bifrenatus)

Pregler

Hagstrom

Schultz

et al. 2019

Aquatic Conservation

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Local extirpation events are often poorly documented and the causes are not well understood. A case in point is the bridle shiner (Notropis bifrenatus), a cyprinid that is declining and carries various conservation listings over most of its range. Recent research suggested that the apparent decline of the bridle shiner in the state of Connecticut may be in part an artefact of changes in survey methods: seining has been replaced by electrofishing, which is less efficient in bridle shiner habitat. The present study included a re‐evaluation of the distribution of the species in light of this recent finding. Historical sites in Connecticut were seined, and it was found that nine populations once thought to be extirpated were in fact extant. Nonetheless, bridle shiner occurrences have declined by 60% over 50 years. Potential correlates of extirpation, such as landscape and habitat fragmentation metrics, were identified using geospatial tools. Through an information‐theoretic approach, models were constructed to investigate the relative contribution of land use and habitat fragmentation to the extirpation of the bridle shiner. Land use had greater support as a correlate of the decline, and the current bridle shiner distribution in Connecticut could be explained by areas of high forest cover and low impervious cover. It is hypothesized that the adverse impacts of land use on the bridle shiner are attributable to its ecological specialization on submerged vegetation, notwithstanding its otherwise broad physiochemical tolerance. These results provide needed context on the decline of this species and provide potential avenues for conservation actions. This research emphasizes the impacts that land alterations can have on freshwater species and the importance of accurately characterizing extirpation events.

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Regional population structure of the endangered Bridle Shiner (Notropis bifrenatus)

et al. 2018

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Extirpation of the Bridle Shiner (Notropis bifrenatus) from Maryland

Cited by 4 publications

References 11 publications

Sustainability of Biodiversity: Use of a NetWeaver Tool to Identify Suitable Sites for Reintroduction of Fishes

Sustainability of Biodiversity: Use of a NetWeaver Tool to Identify Suitable Sites for Reintroduction of Fishes

Landscape factors predict local extirpation in an imperilled minnow species, the bridle shiner (Notropis bifrenatus)

Regional population structure of the endangered Bridle Shiner (Notropis bifrenatus)

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