A Comparison of Relative Weight and Nutritional Status among Four Fish Species in Two Impoundments
| Autor: | John J. Ney, Timothy Copeland, Brian R. Murphy |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Journal of Freshwater Ecology. 23:373-385 |
| ISSN: | 2156-6941 0270-5060 |
| DOI: | 10.1080/02705060.2008.9664214 |
| Popis: | Relative weight (Wr ) was originally developed to assess the physiological status of largemouth bass. Later it was expanded to other centrarchids and, more recently, to non-centrarchids without consideration of how well the concept may fit other taxa. Our goal was to compare the ability of Wr , to convey physiological information among species. We considered the following alternative hypotheses: that the relationship of Wr , to physiological status would vary according to phylogeny, according to ecological specialization, or according to morphology. We collected data (water, protein, lipid, liver, gonad and viscera percentages) from 216 fish of four species (bluegill, largemouth bass, black crappie, chain pickerel) from two Virginia impoundments. All but one population-specific multiple regression model explained a significant amount of variation (F > 2.31, P < 0.05). Both bluegill models explained the least amount of variation (adjusted R 2 < 0.15). Piscivore models fit the data best (adjusted R... |
| Databáze: | OpenAIRE |
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