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Assessing the effects of flow regime variation on Blue Sucker spawning movements, habitat use, and recruitment in the lower Colorado River, TX

Duration

September 2014 - August 2018

Narrative

Blue Sucker Cycleptus elongatus is a state-listed threatened species in Texas and is considered vulnerable throughout its range due to a combination of its habitat requirements and life history traits rendering it sensitive to flow regime alteration and habitat fragmentation. Blue Sucker are long-lived (up to 22 year) and late-maturing (5 or 6 years). The life history strategy of Blue Sucker is poorly understood, but it has been hypothesized that its propensity to undertake long-distance upstream migrations to spawning habitat renders it particularly vulnerable to flow alterations. Furthermore, the habitat requirements of young-of-year Blue Sucker and their growth and survival under different flow conditions are not well known, leading to the suggestion that limited recruitment occurs in populations residing in highly regulated or modified systems. As a group, imperiled catostomids tend to face threats at multiple life history stages, and this seems to be the case in the lower Colorado River. While studies on the threats to Blue Sucker in the lower Colorado River have been limited, the interaction between flow alterations, life-history strategy, and the reproductive ecology of Blue Sucker have been identified as likely contributors to the decline of this species. However, the requirements of early life history stages and how flow alterations influence survival and recruitment represent another potential contributor to declines of Blue Sucker. These interactions are likely to be exacerbated in the future as increased and conflicting demands for water resources in the Colorado River drainage create the potential for further negative impacts on riverine fishes that have life histories associated with seasonal flow patterns, such as Blue Sucker.
The primary objective of this research is to provide information to assess the effects of varied streamflow levels, as regulated by water releases from upstream reservoirs, on habitat use and reproductive success of Blue Sucker in the lower Colorado River.

Research Products and Activities

Peer Reviewed Publications

  • Acre MR, C Alejandrez, J East, WA Massure, S Miyazono, JE Pease, EL Roesler, HM Williams, & TB Grabowski. 2017. Comparison of the precision of age estimates generated from fin rays, scales, and otoliths of Blue Sucker. Southeastern Naturalist 16:215-224. Abstract | 

Presentations

  • Acre MR, TB Grabowski, & D Geeslin. Spawning movements and habitat use of the Blue Sucker Cycleptus elongatus in the lower Colorado River, TX. 2016 Annual Meeting of the Texas Chapter of the American Fisheries Society. Kerrville, Texas. 21-23 January 2016.
  • Acre MR, TB Grabowski, D Geeslin, & A Pease. Movements and Demography of Blue Sucker in the lower Colorado River, TX. 2017 Annual Meeting of the Texas Chapter of the American Fisheries Society. Corpus Christi, Texas. 19-21 January 2017.
  • Acre MR, TB Grabowski, D Geeslin, & A Pease. Movements and demography of Blue Sucker in the lower Colorado River, TX. 2017 2017 Spring Meeting of the Southern Division of the American Fisheries Society. Oklahoma City, Oklahoma. 02-05 February 2017.
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Current Staff

Federal Staff: 102

Masters Students: 247

Phd Students: 163

Post Docs: 55

University Staff: 266

5 Year Summary

Students graduated: 722

Scientific Publications: 1960

Presentations: 4355

 

Personnel

Funding Agencies

  • Texas Parks and Wildlife Department

Links

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