Differences in Flow Regime Influence the Seasonal Migrations, Body Size, and Body Condition of Western Pond Turtles (Actinemys marmorata) that Inhabit Perennial and Intermittent Riverine Sites in Northern California
| Autor: | Cheryl A. Bondi, Sharyn B. Marks |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Copeia. 2013:142-153 |
| ISSN: | 1938-5110 0045-8511 |
| DOI: | 10.1643/ch-12-049 |
| Popis: | Species inhabiting running waters have evolved life-history strategies and morphological characteristics that allow them to survive in fluctuating river environments. Riverine turtles often have behavioral responses associated with seasonal drying and flooding, and morphological variation that is correlated with physical instream habitat. We compared movement behavior, body size, and body condition of Western Pond Turtles (Actinemys marmorata) under two different flow regimes: a regulated reach with dam-influenced perennial flow and a naturally intermittent reach upstream of the dam. We used radiotelemetry to track the seasonal movements of turtles at both sites and compared body size and condition through data gathered during snorkel surveys. We found that timing of migration was significantly influenced by flow regime. Turtles in the intermittent reach departed the river earlier than those in the perennial reach, and also migrated to the river earlier in the spring. Overall, turtles from the intermitten... |
| Databáze: | OpenAIRE |
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