Effects of winterkill on population structure, body size, and prey consumption patterns of pumpkinseed in isolated beaver ponds

作者: Michael G. Fox , Allen Keast

DOI: 10.1139/Z90-348

关键词: PredationPopulation ecologyBeaverPopulationHabitatAquatic animalBiologyEcologyPopulation densityLepomis

摘要: Beaver ponds are a ubiquitous, but rarely studied, aquatic habitat that subject to hypoxia and other catastrophic events can affect fish populations. We examined the population dynamics feeding ecology of pumpkinseeds (Lepomis gibbosus) inhabiting two isolated Ontario beaver adjacent Lake Opinicon determine persistence reasons for small body size in pond Pumpkinseed populations fluctuated drastically both as result winterkills (from decline water level). These eliminated many 96% older resulted consisting mainly age 0–2 individuals. Pond survived 5, whereas lake conspecifics lived 8 or older. The diet consisted chironomids, ephemeropterans, odonates, molluscs, ate molluscs. difference diets was attributed differences prey availability h...

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