Feeding ecology of granivorous carabid larvae: a stable isotope analysis
Feeding ecology of granivorous carabid larvae: a stable isotope analysis
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DOI：
10.1111/j.1439-0418.2009.01451.x
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发表时间：
2010-03-01
影响因子：
1.9
通讯作者：
Kubota, T.
中科院分区：
文献类型：
--
作者：
Sasakawa, K.;Ikeda, H.;Kubota, T.
虽然大多数步甲主要是肉食性的，但有些步甲是杂食性的，在幼虫和/或成虫阶段主要是食谷的（食谷步甲）。这种食性已经建立在实验室和田间实验的基础上，然而，由于缺乏适当的方法，我们对这些甲虫在田间的摄食生态学的了解是有限的。在这项研究中，我们测试的实用程序的稳定同位素分析的摄食生态学的granivorous步甲在外地的调查，使用两个密切相关的同位物种，阿马拉黄铜矿和阿马拉congrua。我们解决了两个问题有关的食谷步甲的摄食生态：食物生态位分化相关的同生物种在幼虫阶段和成年人的身体大小的影响，补充种子与动物的饮食在幼虫阶段。为了调查幼虫的食性，我们分析了新出现的成年人，其中大部分体细胞组织被认为是幼虫的起源。在两个群体中，Δ 15 N和Δ 13 C在A中均显著高于A。chalcites比A. congrua，表明两个物种的食物生态位是有区别的，A. chalcites幼虫比A.共形幼虫A.来自一个地方的黄铜矿样本与体型正相关，表明更多的食肉幼虫变成更大的成虫。然而，这种关系在其他物种/地点组中没有检测到。因此，我们的结果在饮食补充的问题上是不确定的。尽管如此，总体而言，这些结果与以前的实验室饲养实验，并证明了潜在的实用性的稳定同位素分析在实地研究的食谷步甲的摄食生态。
Although most carabids are primarily carnivorous, some carabid species are omnivorous, with mainly granivorous feeding habits during the larval and/or adult stages (granivorous carabids). This feeding habit has been established based on laboratory and field experiments; however, our knowledge of the feeding ecology of these beetles in the field is limited owing to the lack of an appropriate methodology. In this study, we tested the utility of stable isotope analysis in investigations of the feeding ecology of granivorous carabids in the field, using two closely related syntopic species, Amara chalcites and Amara congrua. We addressed two issues concerning the feeding ecology of granivorous carabids: food niche differentiation between related syntopic species during the larval stage and the effect on adult body size of supplementing seeds with an animal diet during the larval stage. To investigate larval feeding habits, we analysed newly emerged adults, most somatic tissues of which are considered of larval origin. In the two populations examined, both delta 15N and delta 13C were significantly higher in A. chalcites than A. congrua, suggesting that the two species differentiate food niches, with A. chalcites larvae being more carnivorous than A. congrua larvae. The two isotope ratios of A. chalcites samples from one locality were positively correlated with body size, suggesting that more carnivorous larvae become larger adults. However, this relationship was not detected in other species/locality groups. Thus, our results were inconclusive on the issue of diet supplementation. Nevertheless, overall, these results are comparable with those of previous laboratory-rearing experiments and demonstrate the potential utility of stable isotope analysis in field studies on the feeding ecology of granivorous carabids.