Seasonal diet and amphipod size selection of juvenile common bully, Gobiomorphus cotidianus, in a coastal New Zealand lake

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作者
Frank M. Wilhelm
Gerard P. Closs
Carolyn W. Burns
机构
[1] University of Otago,Department of Zoology
[2] Southern Illinois University,Department of Zoology and Center for Ecology
来源
Hydrobiologia | 2007年 / 586卷
关键词
Amphipods; Benthic-pelagic linkage; Paracalliope fluviatilis; Selective predation;
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摘要
We examined the seasonal diet of juvenile (≤32 mm total length) common bullies, Gobiomorphus cotidianus, in Lake Waihola, South Island, New Zealand and whether they preyed selectively on the amphipod, Paracalliope fluviatilis, which was a dominant prey item. Generally, ≥75% of all fish sampled had consumed amphipods, which comprised 80%, or more, of the total prey volumes in fish stomachs over most of a year except on one sampling occasion. Copepods, snails, chironomids, Daphnia, mysids and isopods also contributed to the diet. Comparisons of the size distribution of amphipods in fish stomachs and the lake on the date of sampling showed that on four occasions, juvenile bullies selectively consumed small amphipods. No selective feeding was detected on the other occasions. The dominance of primarily benthic amphipods in the diet of juvenile bullies which, in turn, are preyed on by piscivores, suggests a strong benthic-pelagic link in the transfer of energy in Lake Waihola.
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页码:303 / 312
页数:9
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