Population Sex Ratios of Pleurocerid Snails (Leptoxisspp.): Variability and Relationships with Environmental Contaminants and Conditions
| Autor: | J. Reese Voshell, William F. Henley, Serena Ciparis |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
education.field_of_study
geography geography.geographical_feature_category biology Ecology Aquatic ecosystem Population Drainage basin Sampling (statistics) STREAMS Aquatic Science Contamination biology.organism_classification Leptoxis Spatial variability education Ecology Evolution Behavior and Systematics |
| Zdroj: | American Malacological Bulletin. 30:287-298 |
| ISSN: | 0740-2783 |
| DOI: | 10.4003/006.030.0208 |
| Popis: | Anthropogenic introduction of steroidal estrogens and synthetic estrogenic compounds to aquatic environments has increased interest in assessment of the endocrine-disrupting effects of these compounds on aquatic organisms, including mollusks. For gonochoristic freshwater snails in the family Pleuroceridae, little is known about the spatial and temporal variation in population sex ratios or potential relationships between sex ratios and exposure to estrogenic compounds. Population sex ratios of Leptoxis (Rafinesque, 1819) spp., were evaluated within the Shenandoah River watershed (Virginia, U.S.A.), where agricultural operations are a source of estrogenic compounds to streams, and in four other river basins in Virginia. Proportions of females varied among streams within the Shenandoah River watershed, with overall mean proportions from four sampling periods ranging from 0.46–0.87. Sex ratios were consistently female-biased at nine of fifteen stream sampling sites. There was little within-site var... |
| Databáze: | OpenAIRE |
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