Implications of microhabitat selection and patterns of activity on the thermal ecology of high elevation neotropical anurans
Implications of microhabitat selection and patterns of activity on the thermal ecology of high elevation neotropical anurans
复制标题
微生境选择和活动模式对高海拔新热带无尾动物热生态的影响
DOI：
10.1007/bf00329034
复制
发表时间：
1996
期刊：
影响因子：
2.7
通讯作者：
C. Navas
中科院分区：
文献类型：
--
作者：
C. Navas
本文重点研究微生境选择是否减少了高海拔热带两栖动物对低温的暴露。研究了四种无尾两栖类（Colostethus subpunctatus，Atelopus sp. nov.，Eleutherodactylus bogotensis和Hyla labialis），生活在哥伦比亚中部的安第斯山脉。我比较了两个种群（3500米和2900米），以评估海拔变化对微生境热制度和青蛙行为的影响。经常使用的微生境（土壤表面，务虚会网站，沼泽和池塘）的环境温度显着较低，在3500米。然而，对于每个物种的微生境协会和一般的活动模式是相似的，在两个海拔高度。活动蛙的体温主要由微生境选择和时间的交互作用决定，因此3500 m蛙类的活动温度低于2900 m蛙类。陆生和昼行无尾类（Atelopus sp. nov.）经历了高度多变的活动温度。与水体相关的青蛙（C。subpunctatus和H.阴唇）经历了更温和和更少的温度变化。陆栖、夜行蛙（E. bogotensis）的活动温度最低，其热生态受海拔高度的影响较大。热带高海拔地区的物理性质限制了两栖动物行为温度调节的机会，并增加了生理调节的重要性，以耐受广泛的温度范围。这可能部分解释了为什么只有少数两栖动物物种，代表在低海拔地区更加多样化的属，能够利用这些环境。
This paper focuses on whether microhabitat selection reduces exposure to cold temperatures in highelevation tropical amphibians. I studied the microhabitat associations and thermal ecology of four anurans (Colostethus subpunctatus, Atelopus sp. nov., Eleutherodactylus bogotensis, and Hyla labialis) that live in the Andes of central Colombia. I compared two populations (3500 m and 2900 m) to evaluate the impact of a change in elevation on microhabitat thermal regimes and frog behavior. Ambient temperatures of frequently used microhabitats (soil surface, retreat sites, bogs, and ponds) were significantly lower at 3500 m. However, for each species the microhabitat associations and general patterns of activity were similar at both elevations. Body temperatures of active frogs were mainly determined by the interaction between microhabitat selection and time of the day, therefore frogs at 3500 m had lower activity temperatures than conspecifics at 2900 m. Terrestrial and diurnal anurans (Atelopus sp. nov.) experienced highly variable activity temperatures. Frogs associated with water bodies (C. subpunctatus, and H. labialis) experienced more moderate and less variable temperatures. Terrestrial, nocturnal frogs (E. bogotensis) exhibited the lowest activity temperatures, and their thermal ecology was strongly affected by increase in altitude. The physical nature of high tropical elevations limits the opportunities for behavioral thermoregulation in amphibians, and increases the importance of physiological adjustments to tolerate a wide thermal range. This may partially explain why only a small number of amphibian species, representing genera that are much more diverse at lower elevations, have been able to exploit these environments.