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Title: Integrated trophic position decreases in more diverse communities of stream food webs
Authors: Ishikawa, Naoto F.
Chikaraishi, Yoshito
Ohkouchi, Naohiko
Murakami, Aya R.
Tayasu, Ichiro
Togashi, Hiroyuki
Okano, Jun-ichi
Sakai, Yoichiro
Iwata, Tomoya
Kondoh, Michio
Okuda, Noboru
Author's alias: 村上, 綾
岡野, 淳一
Keywords: Food webs
Stable isotope analysis
Issue Date: 18-May-2017
Publisher: Springer Nature
Journal title: Scientific Reports
Volume: 7
Thesis number: 2130
Abstract: The relationship between biodiversity and ecosystem functioning is an important theme in environmental sciences. We propose a new index for configuration of the biomass pyramid in an ecosystem, named integrated trophic position (iTP). The iTP is defined as a sum of trophic positions (i.e. the average number of steps involved in biomass transfer) of all the animals in a food web integrated by their individual biomass. The observed iTP for stream macroinvertebrates ranged from 2.39 to 2.79 and was negatively correlated with the species density and the Shannon–Wiener diversity index of the local community. The results indicate a lower efficiency of biomass transfer in more diverse communities, which may be explained by the variance in edibility hypothesis and/or the trophic omnivory hypothesis. We found a negative effect of biodiversity on ecosystem functioning.
Rights: © The Author(s) 2017
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
URI: http://hdl.handle.net/2433/227869
DOI(Published Version): 10.1038/s41598-017-02155-8
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