POLYUNSATURATE CONTENT AND DIET SELECTION BY GROUND-SQUIRRELS (SPERMOPHILUS-LATERALIS)

被引:65
作者
FRANK, CL [1 ]
机构
[1] UNIV CALIF IRVINE, DEPT ECOL & EVOLUTIONARY BIOL, IRVINE, CA 92717 USA
关键词
DEPOT FATS; DIET CHOICE; HERBIVORY; HIBERNATION; OPTIMAL FORAGING; POLYUNSATURATES; SPERMOPHILUS LATERALIS;
D O I
10.2307/1939549
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Golden-mantled ground squirrels (Spermophilus lateralis) are small herbivores that hibernate during winter. Previous experiments have demonstrated that a high polyunsaturate diet enhances hibernation by ground squirrels. Polyunsaturated fatty acids cannot be synthesized by mammals, but they are commonly produced by plants. It was therefore predicted that ground squirrels, during the 2 mo prior to hibernation, select diet items of a relatively high polyunsaturate content. This hypothesis was tested in a series of laboratory diet selection experiments involving S. lateralis and semisynthetic diets of different polyunsaturate contents. The stomach contents of free-ranging S. lateralis were also analyzed for polyunsaturate content. As predicted, the squirrels preferred semisynthetic diets of relatively higher polyunsaturate contents. Stomach content analyses suggest that the dietary lipids of free-ranging ground squirrels have high polyunsaturate contents. These results indicate that polyunsaturate content may influence the foraging behavior of ground squirrels.
引用
收藏
页码:458 / 463
页数:6
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