The role of fruits and insects in the nutrition of frugivorous bats:: Evaluating the use of stable isotope models
The role of fruits and insects in the nutrition of frugivorous bats:: Evaluating the use of stable isotope models
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DOI：
10.1111/j.1744-7429.2001.tb00206.x
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发表时间：
2001-09-01
期刊：
影响因子：
2.1
通讯作者：
Méndez, G
中科院分区：
文献类型：
--
作者：
Herrera, LG;Hobson, KA;Méndez, G
我们估计的相对贡献的水果和昆虫作为膳食蛋白质的来源，在两种新热带区食果蝙蝠（Artibeus jamaicensis和Sturnira百合）使用稳定的碳和氮同位素分析。还包括一种食虫物种（Pteronotus parnellii）用于比较。我们在血液中发现了稳定的碳和氮同位素组成的恒定模式，将两种食果蝙蝠与食虫蝙蝠分开。当我们使用这些同位素值（结合食用水果和昆虫的同位素值）来估计水果和昆虫对蝙蝠饮食的贡献百分比时，我们得到了不同的结果，这取决于所采用的假设和模型。我们同时和分别使用δ（15）N和δ（13）C结果测试模型，并进一步使用氮的3份/千份和碳的1份/千份和3.5份/千份的膳食组织分级因子。我们发现，一个基于碳的模型，其膳食血液富集因子为千分之3.5，产生了最简约的结果。模型估计A. jamaicensis和S.百合主要从果实中获得蛋白质，而帕那利木主要以昆虫为食。没有性别或季节变化的饮食中的两个食果物种被检测到。我们没有发现任何证据表明，饮食的性活跃的女性从nonsexual活跃的女性在这两种食果蝙蝠。我们建议，未来的研究更好地定义同位素分馏之间的饮食和组织的蝙蝠圈养饲养和控制饮食。
We estimated the relative contribution of fruits and insects as sources of dietary protein in two species of Neotropical frugivorous bats (Artibeus jamaicensis and Sturnira lilium) using stable carbon and nitrogen isotope analyses. An An insectivorous species (Pteronotus parnellii) was also included for comparison. We found constant patterns in stable carbon and nitrogen isotope composition in blood that separated the two species of frugivorous bats from the insectivorous bat. When we used these isotopic values (combined with those of dietary fruits and insects) to estimate the percent contribution of fruits and insects to the diet of the bats, we obtained different results, depending on assumptions and model adopted. We tested models using both delta (15)N and delta (13)C results simultaneously and separately and further used diet-tissue fractionation factors of 3 parts per thousand for nitrogen and 1 and 3.5 parts per thousand for carbon. We found that a carbon-based model with a diet-blood enrichment factor of 3.5 parts per thousand produced the most parsimonious results. The model estimated that A. jamaicensis and S. lilium obtained most of their protein requirements from fruits, whereas P parnellii fed mostly on insects. No sexual or seasonal variations in the diet of the two frugivorous species were detected. We found no evidence that the diet of sexually active females differed from that of nonsexually active females in the two species of frugivorous bats. We suggest that future studies better define isotopic fractionation between diet and tissues of bats using captive rearing and controlled diets.