同种或异种干扰对花鼠分散贮藏点选择的影响

同种和异种干扰竞争可以增强花鼠(Tamias sibiricus)分散贮食强度,但对其贮藏点选择的影响还不清楚.在半自然围栏内,研究了同种(干扰源为不同性别花鼠)或异种(干扰源为大林姬鼠,Apodemus peninsulae)干扰竞争对花鼠贮藏点选择的影响.结果发现:(1)同种和异种干扰竞争均显著降低了花鼠在高竞争区内的贮藏比例；(2)同种个体存在时,雌性花鼠显著降低了在高竞争区内的贮藏比例,雄性花鼠则显著增加了在中竞争区的埋藏比例.结果表明,花鼠贮藏食物时会避开高竞争区域以降低同种或异种的盗食损失,同时雌雄个体对同种竞争干扰的响应有所差异.

Effects of conspecific and interspecific interference competitions on cache site selection of Siberian chipmunks (Tamias sibiricus)

Siberian chipmunks (Tamias sibiricus) tend to increase scatter-hoarding intensity in face of competitions posited by conspecifics and / or interspecifics; however, little is known how they deposit their caches in response to these competitions. Within outdoor enclosures, we investigated how Siberian chipmunks response to conspecifics (females and males) and interspecifics (Korean field mice, Apodemus peninsulae) in cache site selection. We found: (1) Siberian chipmunks avoided to cache in the areas of high competitions in face of both conspecifics and interspecifics; (2) female chipmunks decreased to cache in the high competition areas, while males increased to cache in the median competition areas when conspecifics presented. These results suggest that when competition is high, Siberian chipmunks tend to reduce hoarding foods in the areas with high competition to avoid pilferage; however, males and females may response differently to conspecifics in cache site selection.