Weaker resource diffusion effect at coarser spatial scales observed for egg distribution of cabbage white butterflies

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• 作者：Marc Hasenbank ; Stephen Hartley
• 关键词：Area ; restricted search ; Pieris rapae ; Hierarchical models
• 刊名：Oecologia
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：177
• 期：2
• 页码：423-430
• 全文大小：622 KB
• 参考文献：1. Barritt J (2008) Simulation of the effects of movement patterns and resource density on the egg distribution of / Pieris rapae (Lepidoptera) at multiple spatial scales. Masters thesis, Victoria University of Wellington, New Zealand
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• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Ecology
  Plant Sciences
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1939

文摘

Mobile organisms frequently forage for patchy resources; e.g. herbivorous insects searching for host plants. The resource diffusion hypothesis predicts that insect herbivores, such as Pieris rapae butterflies, are disproportionally attracted to more isolated, or ‘diffused- host plants. Surprisingly little is known about how this response to variation in resource density manifests itself at different spatial scales. We measured the outcome of oviposition by P. rapae butterflies foraging among groups of host plants, with plant density experimentally varied to achieve comparability between three nested scales: fine (1?×?1?m), medium (6?×?6?m), and coarse (36?×?36?m). Hierarchical linear models were used to measure density-dependent responses in the number of eggs laid per plant, with plant density measured at nested spatial scales. At a fine scale, isolated plants received significantly more eggs, while at medium and coarse scales the differences were less pronounced, and tended towards a neutral distribution of eggs across plants. Larger plants also tended to receive more eggs. Since multiple processes, acting at multiple scales, are likely to be the rule rather than the exception in ecology, methods for detecting and characterising multi-scale responses are important to ensure a robust transfer of ecological models from one situation to another.