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首页> 外文期刊>Marine ecology >Prey Composition and Prey Selectivity of an Intertidal Generalist Predator, Muricodrupa fusca (Kuester) (Muricidae)
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Prey Composition and Prey Selectivity of an Intertidal Generalist Predator, Muricodrupa fusca (Kuester) (Muricidae)

机译：潮间全能捕食者Muricodrupa fusca（Kuester）（Muricidae）的猎物组成和猎物选择性

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摘要

Natural prey composition and prey selectivity of the muricid snail Muricodrupa fusca (Kuster), which forages on a wide range of prey, was investigated. Natural prey composition was evaluated through correcting the apparent diet (the result of observations of the feeding behavior) by the handling time, which was determined by laboratory analysis. The apparent diet and the natural diet should generally differ because prey items that require a longer handling time will be observed with higher frequencies. Multiple regression equations were derived to relate the handling time to prey size, predator size and water temperature. A large discrepancy in the apparent versus natural diet of M. fusca was found in prey species composition and prey size. They foraged on at least 11 species of sessile and mobile prey including six limpet species, and mainly preyed on Siphonaria spp. and Lottia spp. in the field. By comparing the percentage of the natural diet to that of prey abundance in the field, M. fusca preferred Siphonaria spp. and Lottia spp. and did not select the other prey species. The selectivity of this predator was explained by optimal foraging theory and antipredator defenses of some limpet species. The relationships among attacking methods, handling time and prey selectivity are also examined.
机译：研究了在各种猎物上觅食的水田螺Muricodrupa fusca（Kuster）的自然猎物组成和猎物选择性。通过根据处理时间校正表观饮食（观察喂养行为的结果）来评估天然猎物的组成，该处理时间由实验室分析确定。表观饮食与自然饮食通常应有所不同，因为需要更长处理时间的猎物会被更高频率地观察到。推导了多个回归方程，将处理时间与猎物大小，捕食者大小和水温相关。在猎物种类组成和猎物大小方面，发现了富营养的山毛榉外观和自然饮食存在很大差异。他们在至少11种无柄和移动猎物上觅食，其中包括6种帽贝，主要捕食虹吸虫。和Lottia spp。在该领域。通过比较田间自然饮食与猎物丰富度的百分比，M。fusca选择了虹吸菌。和Lottia spp。并没有选择其他猎物。通过最佳觅食理论和某些帽贝物种的反捕食者防御机制，可以解释这种捕食者的选择性。还研究了攻击方法，处理时间和猎物选择性之间的关系。

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