High Niche Overlap in the Stable Isotope Space Of Ground Beetles
High Niche Overlap in the Stable Isotope Space Of Ground Beetles
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DOI：
10.5735/086.051.0302
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发表时间：
2014-06
期刊：
影响因子：
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通讯作者：
M. Zalewski;D. Dudek;A. Tiunov;J. Godeau;Y. Okuzaki;H. Ikeda;P. Sienkiewicz;W. Ulrich
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文献类型：
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作者：
M. Zalewski;D. Dudek;A. Tiunov;J. Godeau;Y. Okuzaki;H. Ikeda;P. Sienkiewicz;W. Ulrich
关于装配规则和食物网结构的经典理论是以物种为中心的，因此它们在很大程度上忽略了种内变异。然而，种内营养变异可能是理解群落组织的关键。在这里，我们研究的变异性同位素生态位空间的地面甲虫和其后果的营养结构的甲虫大会。在北方波兰的马苏里亚莱克兰的20个岛屿和两个大陆地点，测量了1156个属于59个物种的步甲标本的稳定同位素比值（13 C和15 N）。步甲属于三个不同的营养集团（命名为“植食”，“分解者饲养者”和“通才捕食者”）。然而，这种划分是不尖锐的，由于高种内变异的同位素签名，这表明使用非常不同类型的资源的同种个体居住在不同的网站。因此，大多数物种的研究并没有显着不同的同位素生态位空间。这种高生态位重叠证实了这样的观点，即资源竞争不是一个主要因素塑造的地面甲虫群落的组成。未来的研究应考虑到甲虫群落的复杂营养结构，并探讨种内生态位变异的地面甲虫。
Classic theories on assembly rules and food-web structure are species-centered, so they largely ignore intraspecific variation. Intraspecific trophic variation, however, might be of key importance in understanding community organization. Here we study the variability of isotopic niche spaces of ground beetles and its consequences for the trophic structure of beetle assembly. Stable isotopes ratios (13C and 15N) were measured in 1156 specimens of carabids belonging to 59 species inhabiting 20 island and two mainland sites of the Masuria Lakeland in northern Poland. Carabid species belonged to three different trophic guilds (named “phytophages”, “decomposer feeders” and “generalist predators”). However, this division is not sharp due to high intraspecific variability of isotopic signatures, which indicates the use of very different types of resources by conspecific individuals inhabiting different sites. As a consequence, most species studied did not differ significantly in the isotopic niche space. This high niche overlap corroborates the view that resource competition is not a major factor shaping the composition of ground beetles communities. Future studies should take into account the complex trophic structure of beetle assemblages and explore the intraspecific niche variability of ground beetles.