MOONLIGHTS INFLUENCE ON PREDATOR PREY INTERACTIONS BETWEEN SHORT-EARED OWLS (ASIO-FLAMMEUS) AND DEERMICE (PEROMYSCUS-MANICULATUS)
MOONLIGHTS INFLUENCE ON PREDATOR PREY INTERACTIONS BETWEEN SHORT-EARED OWLS (ASIO-FLAMMEUS) AND DEERMICE (PEROMYSCUS-MANICULATUS)
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DOI：
10.1007/bf00299924
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发表时间：
1983-01-01
影响因子：
2.3
通讯作者：
CLARKE, JA
中科院分区：
文献类型：
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作者：
CLARKE, JA
本研究探讨了月光强度对鹿鼠对短耳猫头鹰(ASIO Flammeus)捕食能力的影响。在飞行舱中模拟了三种夜间的光强度，分别为新月、四分之一月和满月。鹿鼠的活动是通过跟踪强度指数在沙地上观察和测量的。然后，在每个光照强度下，让小鼠暴露在短耳猫头鹰的捕食下，并测量搜索时间、追逐时间、捕获时间和逃脱/追逐的数量。这些结果揭示了在满月光下抑制鹿鼠活动作为一种反捕食者反应的适应性意义。在活动期，鹿鼠在明亮的月光下活动显著减少。在捕食阶段，猫头鹰的捕食效率随着月光的增加而增加。随着光照的增加，猫头鹰寻找和捕获老鼠所需的时间显著减少。根据猎物活动随月光强度的变化，讨论了这两个物种的成本和收益。
This study examines the effect of moonlight intensity on deermouse (Peromyscus maniculatus) vulnerability to predation by short-eared owls (Asio flammeus). Three nocturnal light intensities, labeled new moon, quarter moon, and full moon, were simulated in a flight chamber. Deermouse activity was observed and measured by an index of tracking intensity in the chamber's sand floor. The mice were then exposed to predation by a short-eared owl in each light intensity and search time, chase time, capture time, and the number of escapes/chase were measured. The results reveal the adaptive significance of deermouse activity suppression in full moon light as an anti-predator response. The deermice reduced activity significantly in bright moonlight during the activity phases. During the predation phases, the owls' hunting effectiveness increased as moonlight waxed. The owls required significantly less time to search for and capture the mice as illumination increased. The costs and benefits to both species are discussed relative to the prey's variation of activity with moonlight intensity.