Characterization of Plasma Vitellogenin and Sex Hormone Concentrations during the Annual Reproductive Cycle of the Endangered Razorback Sucker
| Autor: | Mandy L. Annis, Diana M. Papoulias, Jason Nachtmann, Kevin J. Kroll, Carrie L. H. Marr, Nancy D. Denslow, Jo Ellen Hinck, Donald E. Tillitt |
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| Rok vydání: | 2011 |
| Předmět: |
education.field_of_study
Ecology biology Population Xyrauchen texanus Endangered species Zoology Management Monitoring Policy and Law Aquatic Science biology.organism_classification Hatchery Predation Vitellogenin biology.protein Sucker education Ecology Evolution Behavior and Systematics Testosterone |
| Zdroj: | North American Journal of Fisheries Management. 31:765-781 |
| ISSN: | 1548-8675 0275-5947 |
| DOI: | 10.1080/02755947.2011.591231 |
| Popis: | Population declines of the endangered razorback sucker Xyrauchen texanus in the Colorado River basin have been attributed to predation by and competition with nonnative fishes, habitat alteration, and dam construction. The reproductive health and seasonal variation of the reproductive end points of razorback sucker populations are currently unknown. Using nonlethal methods, we characterized the plasma hormonal fluctuations of reproductively mature female and male razorback suckers over a 12-month period in a hatchery by measuring their vitellogenin (VTG) and three sex hormones: 17β-estradiol (E2), testosterone (T), and 11-ketotestosterone (KT). Fish were identified as reproductive or nonreproductive based on their body weight, VTG, and sex hormone profiles. In reproductive females, the E2 concentration increased in the fall and winter, and increases in T and VTG concentrations were generally associated with the spawning period. Mean T concentrations were consistently greater in reproductive femal... |
| Databáze: | OpenAIRE |
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