Stable isotopes document resource partitioning and effects of forest disturbance on sympatric cheirogaleid lemurs
Stable isotopes document resource partitioning and effects of forest disturbance on sympatric cheirogaleid lemurs
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DOI：
10.1007/s00114-013-1094-6
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发表时间：
2013-10-01
影响因子：
--
通讯作者：
Irwin, M. T.
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文献类型：
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作者：
Crowley, B. E.;Blanco, M. B.;Irwin, M. T.
马达加斯加森林和狐猴的未来岌岌可危。确定物种对森林破碎化的反应对管理工作至关重要。我们使用稳定的同位素地球化学研究干扰如何影响资源分配的两个属的cheirogaleid狐猴（Cheirogaleus和Microcebus）从三个潮湿的森林网站：连续和破碎的森林在Tsinjoarivo，并选择性地记录在Ranomafana森林。我们测试三个假设：（H1）掌盔类不受森林破碎化的影响;（H2）物种对干扰有个体反应，并可能在破碎化的生境中利用新的资源;（H3）物种改变行为，依赖于受干扰森林中的同一关键资源。我们发现物种和地区之间的显着同位素差异。碳数据表明，在所有三个地点，Microcebus比Cheirogaleus在冠层中取食更低，并且同域的Cheirogaleus crossleyi和C。在破碎的森林中，西伯利亚虎在不同的树冠高度上觅食。在所有地点，Microcbus的氮同位素值都高于Cheirogaleus，表明其动物群更单一。在考虑了植物中的基线同位素值后，我们的结果为H3提供了最大的支持。我们发现这两个属的地方之间的同位素变化相似。不同地区之间碳的微小差异可能反映了饮食或栖息地使用的变化。氮值升高的cheirogaleid狐猴片段可能反映了增加节肢动物的消费或营养压力。这些结果表明，cheirogaleids在马达加斯加东部的森林干扰的影响，并强调在任何工作比较地方的植物中的基线同位素差异占的重要性。
The future of Madagascar's forests and their resident lemurs is precarious. Determining how species respond to forest fragmentation is essential for management efforts. We use stable isotope biogeochemistry to investigate how disturbance affects resource partitioning between two genera of cheirogaleid lemurs (Cheirogaleus and Microcebus) from three humid forest sites: continuous and fragmented forest at Tsinjoarivo, and selectively logged forest at Ranomafana. We test three hypotheses: (H1) cheirogaleids are unaffected by forest fragmentation, (H2) species respond individually to disturbance and may exploit novel resources in fragmented habitat, and (H3) species alter their behavior to rely on the same key resource in disturbed forest. We find significant isotopic differences among species and localities. Carbon data suggest that Microcebus feed lower in the canopy than Cheirogaleus at all three localities and that sympatric Cheirogaleus crossleyi and C. sibreei feed at different canopy heights in the fragmented forest. Microcbus have higher nitrogen isotope values than Cheirogaleus at all localities, indicating more faunivory. After accounting for baseline isotope values in plants, our results provide the most support for H3. We find similar isotopic variations among localities for both genera. Small differences in carbon among localities may reflect shifts in diet or habitat use. Elevated nitrogen values for cheirogaleid lemurs in fragments may reflect increased arthropod consumption or nutritional stress. These results suggest that cheirogaleids are affected by forest disturbance in Eastern Madagascar and stress the importance of accounting for baseline isotopic differences in plants in any work comparing localities.