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首页> 外文期刊>Journal of Comparative Physiology, B. Biochemical, Systemic, and Environmental Physiology >Comparative energetics and thermal responses to feeding in allied Agkistrodon snakes with contrasting diet and habitat use
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Comparative energetics and thermal responses to feeding in allied Agkistrodon snakes with contrasting diet and habitat use

机译:比较能量和热反应在盟军agkistrodon蛇喂养,饮食和栖息地使用

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摘要

Variation in animal responses to feeding can be attributed to a variety of ecological factors, including foraging mode and dietary specialization. Specialization often favors species that have traits for exploiting food resources that are rare and that are not commonly shared by dietary generalists. We investigated physiological and behavioral responses to feeding between two snake species with different degrees of mammal feeding specialization: Agkistrodon contortrix (copperheads; a terrestrial species in which adults feed almost exclusively on mammals) and Agkistrodon piscivorus (cottonmouths; a semi-aquatic species feeding less on mammals and primarily on ectothermic prey). We measured metabolic rates (at 20, 25, and 30 degrees C) and body temperature (T-b) selection of snakes both pre- and post-feeding. Following the consumption of rodent meals, post-feeding energy use was higher in A. piscivorus than A. contortrix at both 25 and 30 degrees C. After feeding, A. piscivorus maintained body temperatures that were 3-4 degrees C higher, whereas A. contortrix remained within 1 degrees C of their pre-feeding T-b. Our results support the contention that dietary specialization leads to potential energetic advantages and that generalist species may change their behavior to offset energy used to digest prey.
机译:动物反应的变异可以归因于各种生态因素,包括觅食模式和膳食专业化。专业化往往有利于具有用于利用罕见的食物资源的特征的物种,这不常见的饮食通用。我们调查了在具有不同哺乳动物饲养专业化的两条蛇种类之间喂养的生理和行为反应:Agkistrodon Contortrix(Copperheads;一种陆地物种,其中成年人几乎完全喂食哺乳动物)和Agkistrodon Piscivorus(Controstouths;一种较少的半水生物种喂养在哺乳动物上,主要是在异温猎物上)。我们测量了代谢率(在20,25和30摄氏度)和体温(T-B)的选择中,蛇的选择既是饲养和后送。在啮齿动物膳食消耗后,A. Piscivorus的喂食能量使用比A. Contortrix在25和30摄氏度上。喂食后,A. Piscivorus保持高度为3-4摄氏度的身体温度,而a 。Contortrix仍然在其预馈TB的1摄氏度范围内。我们的结果支持饮食专业化导致潜在的能量优势,并且通用物种可能会改变其行为,以抵消用于消化猎物的抵消能量。

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