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Seasonal habitat selection by 42 blue suckers in the lower Colorado River, Texas, USA,
2015–2017. Results were from substrate within a 5-m buffer around fish detections (n = 1157) compared against available substrate within the river. Values inside the white boxes represent significant χ2 results from the contingency test, and “+” indicates selection for while “−” indicates avoidance of a substrate. Substrates with no result were neither selected nor avoided relative to their availability. Fine sediment is abbreviated FS and submerged aquatic vegetation is abbreviated SAV

Seasonal habitat selection by 42 blue suckers in the lower Colorado River, Texas, USA, 2015–2017. Results were from substrate within a 5-m buffer around fish detections (n = 1157) compared against available substrate within the river. Values inside the white boxes represent significant χ2 results from the contingency test, and “+” indicates selection for while “−” indicates avoidance of a substrate. Substrates with no result were neither selected nor avoided relative to their availability. Fine sediment is abbreviated FS and submerged aquatic vegetation is abbreviated SAV

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Species conservation requires a clear understanding of habitat availability and subsequent use of those habitats. In cases where species declines have occurred and gone undetected by conservation managers , habitat alteration, fragmentation, and loss are often the largest contributors. River fragmentation often results in altered flow regimes, subs...

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Citations

... They are a large-bodied, long-lived fish known to migrate long distances upstream to reach spawning grounds in large rivers and their tributaries (Neely et al. 2009;Mettee et al. 2015). The construction of dams, river channelization, and other anthropogenic disruptions across their range have been cause for concern among fisheries biologists (Vokoun et al. 2003;Jelks et al. 2008;Dyer and Brewer 2020;Tornabene et al. 2020;Acre et al. 2021) and prompted a proposal to list Blue Suckers as federally threatened or endangered (Elstad and Werdon 1993). Although they were not designated for federal protection, the Blue Sucker is still considered vulnerable or imperiled throughout most of its range (Jelks et al. 2008;NatureServe 2021). ...
Article
Blue Sucker Cycleptus elongatus is a species of concern across much of its native range due to population fragmentation and habitat loss. A key component of managing this species is monitoring various population characteristics including size structure. A common way to quickly index population size structure is to calculate the proportional size distribution (PSD). However, no standard length categories have been established for Blue Suckers, precluding the use of this index. We used databases, literature searches, field guides, and sampling records to find the largest recorded Blue Sucker. The maximum size Blue Sucker on record was 93 cm, so we propose the following standardized length categories: stock = 23 cm, quality = 38 cm, preferred = 51 cm, memorable = 58 cm, and trophy = 74 cm. We estimated mean PSD values using a generalized linear mixed model with a multinomial likelihood for populations of Blue Suckers from six rivers: the James, Big Sioux, Colorado, Red, Wabash, and Missouri. Most of these populations exhibited large size structure except the James River. These PSD length categories should provide an additional tool for evaluating spatial and temporal changes in size structure of Blue Sucker populations when monitoring the status of this species of concern.