Recruitment dynamics of walleyes (Stizostedion vitreum) in Kansas reservoirs: generalities with natural systems and effects of a centrarchid predator
作者： Michael C Quist , Christopher S Guy , James L Stephen
DOI: 10.1139/F03-067
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摘要: Knowledge of factors influencing recruitment dynamics walleyes (Stizostedion vitreum) in different sys- tems and regions is important for developing a better understanding walleye ecology. Therefore, we investigated associations among climatic, water-level, biotic characteristics four Kansas reservoirs during 1985-1999. Walleye was positively related to spring storage ratios temperatures negatively associated with water levels abundance 130- 199-mm white crappies (Pomoxis annularis). The influ- ence juvenile crappie predation on larval examined by conducting manipulative experiment. Regardless zooplankton density or clarity, mortality resulting from over 90%. Based our empirical experimental results, propose biotic-abiotic confining hypothesis (BACH) explain abiotic effects dynamics. Specifically, high variability observed years low densities likely resulted the factors. When high, exhibited little variability, suggesting that can have an overriding influence regardless conditions. Resume : Une connaissance des facteurs qui influencent la dynamique du recrutement dores jaunes dans divers systemes et est necessaire pour mieux comprendre l'ecologie de ce poisson. Nous avons donc etudie les entre le dore caracteristiques climat niveau l'eau, ainsi que biotiques, quatre 1985 1999. Le en re- lation positive avec coefficients stockage au printemps relation negative ni- veaux d'eau l'abondance mariganes blanches annularis) 130-199 mm. experience manipulation permis determiner l'influence jeunes sur larves dores. Quelle soit densite zooplancton ou clarte mortalite due aux supe - rieure 90 %. D'apres nos resultats empiriques experimentaux, nous proposons une hypothese BACH (hypothese contraignante biotique-abiotique) expliquer effets abiotiques biotiques Plus specifiquement, il y forte variabilite durant annees faible abon dance mm resulte sans doute abiotiques. Lorsque elevee, peu variable, fait croire ont preponderante dores, quelles soient conditions
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