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首页> 外文期刊>Herpetologica >Microhabitat and prey odor selection in the foraging pigmy rattlesnake
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Microhabitat and prey odor selection in the foraging pigmy rattlesnake

机译：觅食猪响尾蛇的微生境和猎物气味选择

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摘要

We tested the roles of shelter and prey odor cues on the prestrike movement patterns of the dusky piginy rattlesnake, Sistrurus miliarius barbouri. In the first experiment, prey odors-mouse, frog, lizard, plus control-were presented in various combinations with and without shelters. The pigmy rattlesnake initially preferred sites with both from odor and shelter. However, this changed over a 23-h period so that shelter alone became the most preferred feature of the microhabitat choices. The initial 2 h pigmy response was similar to that reported for the western rattlesnake (Crotalus viridius), in that they responded differently to the four choice combinations of shelter and prey odor. This initial pigmy response differed in that only frog odor (but not mouse or lizard odor) affected their initial choices. Our work also indicates that when foraging. novel prey odors (frog) initially attracted their attention, but preference for this odor soon declined. In the second experiment, we examined the preference for prey odors by simultaneously presenting all three prey odors plus control (water). The snakes exhibited no prey odor preference during the first 2-h or during the total 23-h of the trials. In both experiments, the pattern of circadian activity was the same. Circadian activity showed two peaks, one shortly before onset of the nocturnal phase and the second just before midnight: thereafter, activity gradually declined so that most snakes were in, and remained in, a shelter by morning when the diurnal phase began. In these experiments, active movement in pigmy rattlesnakes occurred nocturnally and by day they remain in settled locations. While in such settled positions, the pigmy rattlesnakes coiled into stereotypic ambush postures facing the opening in their shelter where prey would most likely pass.
机译：我们测试了庇护所和猎物气味线索在昏暗的响尾蛇响尾蛇Sistrurus miliarius barbouri的打击前运动模式中的作用。在第一个实验中，以带有或不带有掩体的各种组合呈现了猎物的气味-老鼠，青蛙，蜥蜴和控制物。最初，响尾蛇喜欢带有气味和庇护所的地方。但是，这在23小时内发生了变化，因此，单独的庇护所已成为微型栖息地选择的最优选特征。最初的2 h猪瘟反应与西部响尾蛇（Crotalus viridius）的报道相似，因为它们对庇护所和猎物气味的四种选择组合的反应不同。最初的多动反应的不同之处在于，只有青蛙味（而不是老鼠或蜥蜴味）会影响他们的最初选择。我们的工作还表明在觅食时。新颖的猎物气味（青蛙）最初吸引了他们的注意，但对这种气味的偏好很快下降。在第二个实验中，我们通过同时呈现所有三种猎物气味和对照（水）来检查对猎物气味的偏好。在试验的前2个小时或总共23个小时内，蛇没有表现出猎物气味的偏好。在两个实验中，昼夜活动的模式是相同的。昼夜节律活动显示出两个高峰，一个高峰出现在夜间进入夜间之前，第二个高峰出现在午夜之前：此后，活动逐渐下降，以至于白天开始时，大多数蛇都在一个庇护所中并留在其中。在这些实验中，夜行性的响尾蛇活跃运动是夜间发生的，直到白天它们仍停留在定居点。当处于这样的定居位置时，小猪的响尾蛇盘旋成刻板的伏击姿势，面向他们住所中最有可能掠过猎物的开口。

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