Shifts in food availability and associated shifts in space use and diet in stone marten
Shifts in food availability and associated shifts in space use and diet in stone marten
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发表时间：
2006
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通讯作者：
Heiko G. Rödel;M. Stubbe
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作者：
Heiko G. Rödel;M. Stubbe
哺乳动物的空间分布模式通常被认为受到食物可利用性变化的影响，从而导致饮食的变化。然而，缺乏详细的案例研究证明这种关系。我们在这里提出这样一个研究进行了两个石貂（Martes foina）。我们通过无线电遥测技术收集了关于个人空间使用的数据，通过粪便分析测量了饮食，并评估了一些主要食物项目的食物供应变化。总体而言，空间利用的变化受到饮食变化的影响，可能是当地食物供应变化的结果。在一个案例中，当夏末当地水果（樱桃）的供应量减少时，动物停止了在其家域的一部分活动。樱桃在其饮食中的减少主要通过增加其他种类水果和小型哺乳动物的摄入来补偿。在另一种情况下，动物在冬季季节性主食蚯蚓供应不足时暂时冒险进入其通常活动范围以外的地区。在新的地区，它以现有的水果和小哺乳动物为食。
Spacing patterns of mammals are commonly assumed to be influenced by changes in food availabili- ty, resulting in shifts in diet. However, there is a lack of detailed case studies proving this relationship. We pre- sent here such a study carried out on two stone martens (Martes foina). We collected data on individual space use by radio telemetry, measured the diet by faecal analysis, and assessed changes in food availability of some main food items. Overall, changes in space use were paralleled by changes in diet, and might have been the result of changes in local food availability. In one case the animal stopped being active in a part of its home range when the high local availability of fruit (cherries) decreased in late summer. This decrease in cherries within its diet was mostly compensated for by increased ingestion of other kinds of fruit and of small mammals. In another case, the animal temporarily ventured into an area outside of its usual range of activity during winter when the availability of its seasonal staple food, earthworms, was low. In the new area, it fed on the available fruits and small mam- mals.