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首页> 外文期刊>Ethology >Eat or Not to Eat: Reversed Sexual Cannibalism as a Male Foraging Strategy in the Spider Micaria sociabilis ( Araneae: Gnaphosidae)
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Eat or Not to Eat: Reversed Sexual Cannibalism as a Male Foraging Strategy in the Spider Micaria sociabilis ( Araneae: Gnaphosidae)

机译：吃还是不吃：颠倒性食人作为蜘蛛状Micaria sociabilis的男性觅食策略（Araneae：Gnaphosidae）

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摘要

Reversed sexual cannibalism represents an unusual situation in which a male kills and consumes a female. We examined this rare phenomenon in the spider Micaria sociabilis, whose males were observed to regularly cannibalise old females. In this study, we investigated male motivation for such behaviour in the light of ecological conditions such as mate availability and prey availability. We found that male cannibalism is not affected by short-term starvation but rather by male feeding history during the ontogenetic development in combination with prey availability during the adult stage. Males from the summer generation reached bigger sizes than males from the spring generation and females from both generations. They developed in the period with exceptionally high prey occurrence, but when they reached the adult stage, the prey availability decreased. In this period, we observed the highest frequency of cannibalism, however, only when the sex ratio was female biased. Reversed sexual cannibalism in M.sociabilis seems to represent an advantageous male foraging strategy, which is affected by prey availability and male feeding history, tuned by sex ratio and directed towards females of inferior quality.
机译：逆向性食人主义代表一种不寻常的情况，男性杀死并吞噬女性。我们在蜘蛛Micaria sociabilis中检查了这种罕见现象，观察到它的雄性经常蚕食老雌性。在这项研究中，我们根据生态条件（例如配偶的可利用性和猎物的可利用性）调查了男性对这种行为的动机。我们发现，男性食人症不受短期饥饿的影响，而是受个体发育过程中成年男性摄食的历史以及成年阶段猎物可利用性的影响。夏季一代的雄性比春季一代的雄性和两代雌性的雄性都要大。它们在猎物发生的时期特别高，但是到成年阶段时，猎物的可利用性下降了。在此期间，我们观察到食人行为的频率最高，但是仅当性别比处于女性偏见时。颠倒性食人鱼的性相食相似乎代表了一种有利的雄性觅食策略，该策略受猎物的可获得性和雄性摄食历史的影响，受性别比例调整，并针对劣质雌性。

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