Sex-related differences in the diet of the mink Mustela vison
Sex-related differences in the diet of the mink Mustela vison
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水貂饮食中与性别相关的差异 Mustela vison
DOI：
10.1111/j.1600-0587.1985.tb01175.x
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发表时间：
1985
期刊：
影响因子：
5.9
通讯作者：
N. Dunstone
中科院分区：
文献类型：
--
作者：
J. Birks;N. Dunstone
自由放养的雄性和雌性水貂的饮食取样分析从放射性标记的个人收集的粪便。显着的性别差异是明显的捕食后的五个主要猎物群体。较大的男性捕食更沉重的兔形目动物，最大的猎物，而女性捕食鱼类和甲壳类动物比男性。这些差异是一致的，在每个季节，除了秋季（9月至11月），当男性捕食更严重的鱼类和甲壳类动物比女性。由于其庞大的体积，成年兔形被认为是相对不可用的女性水貂。雄性水貂显然是大到足以专门对兔形，和雄性水貂生态位宽度始终低于女性。饮食重叠接近40%，在所有季节，除夏季（68%），当女性捕食兔形达到高峰。这种种内摄食竞争的减少被认为是体型二型性的一个有价值的副作用。
The diets of free-ranging male and female mink were sampled by analysing faeces collected from radio-tagged individuals. Significant sex differences were apparent in the predation upon three of the five principal prey groups. The larger males preyed much more heavily upon lagomorphs, the largest prey taken, while females preyed more upon fish and crustaceans than did males. These differences were consistent in each season except the autumn (September to November), when males preyed more heavily upon fish and crustacea than did females. Due to their large size, adult lagomorphs are felt to be relatively unavailable to female mink. Male mink are apparently large enough to specialize on lagomorphs, and male mink niche breadth was consistently lower than that of females. Dietary overlap approximated to 40% in all seasons except summer (68%), when female predation upon lagomorphs reached a peak. This reduction in intraspecific feeding competition was felt to be a valuable side-effect of body-size dimorphism.