The effects of reproductive state on digestive efficiency in three sympatric bat species of the same guild
The effects of reproductive state on digestive efficiency in three sympatric bat species of the same guild
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DOI：
10.1016/j.cbpa.2012.04.021
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发表时间：
2012-08-01
影响因子：
2.3
通讯作者：
Tschapka, Marco
中科院分区：
文献类型：
--
作者：
Becker, Nina I.;Encarnacao, Jorge A.;Tschapka, Marco
作为能量来源的食物与代谢能之间的功能联系是消化道。消化器官的大小、结构或保留时间可能会随着动物能量需求的变化而变化。高效的消化道可能更善于处理食物，但即使在吸收后也需要更高的能量投入来维持。这些消耗影响静息代谢率（RMR）， RMR被定义为在静息动物中为重要代谢功能提供燃料所需的能量。在蝙蝠中，高效消化道的必要性和适度能量维持成本之间的权衡可能特别重要。我们假设低RMR与低消化效率（定义为表观代谢能系数（MEC））一致，并且能量需求增加的阶段由消化效率的提高来补偿。我们测量了三种蝙蝠（Myotis nattereri、M. bechsteinii和Plecotus auritus）的RMR和表观MEC。为了支持我们的假设，野田鸡的质量比RMR和表观MEC在三个物种中最低。然而，在任何一种蝙蝠中，表观MEC在不同能量需求的阶段都没有变化，这可能是因为蝙蝠在其可持续能量需求的极限下活动。(C) 2012爱思唯尔公司版权所有。
The functional link between food as an energy source and metabolizable energy is the digestive tract The digestive organs may change in size, structure, or retention time in response to energetic demands of the animal. Very efficient digestive tracts may be better at processing food but require higher energetic investments for maintenance even when post-absorptive. These costs influence the resting metabolic rate (RMR) that is defined as the energy necessary to fuel vital metabolic functions in a resting animal. In bats a trade-off between the necessity for a highly efficient digestive tract and moderate energetic maintenance costs may be particularly important We hypothesized that low RMR coincides with low digestive efficiency (defined as apparent metabolizable energy coefficient (MEC)) and that phases of increased energetic demand are compensated for by increased digestive efficiency. We measured RMR and apparent MEC in the bats species Myotis nattereri, M. bechsteinii, and Plecotus auritus. In support of our hypothesis, M. nattereri has the lowest mass-specific RMR of the three species and the lowest apparent MEC. However, apparent MEC did not change during phases with differing energetic demands in any of the bat species, probably because bats operate at the limit of their sustainable energy demand. (C) 2012 Elsevier Inc. All rights reserved.