Integrated trophic position decreases in more diverse communities of stream food webs

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. t...

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Autores principales:	Naoto F. Ishikawa, Yoshito Chikaraishi, Naohiko Ohkouchi, Aya R. Murakami, Ichiro Tayasu, Hiroyuki Togashi, Jun-ichi Okano, Yoichiro Sakai, Tomoya Iwata, Michio Kondoh, Noboru Okuda
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/48c8da88b29748da8a02b4ea4b49103c
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spelling	oai:doaj.org-article:48c8da88b29748da8a02b4ea4b49103c2021-12-02T12:32:39ZIntegrated trophic position decreases in more diverse communities of stream food webs10.1038/s41598-017-02155-82045-2322https://doaj.org/article/48c8da88b29748da8a02b4ea4b49103c2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02155-8https://doaj.org/toc/2045-2322Abstract 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.Naoto F. IshikawaYoshito ChikaraishiNaohiko OhkouchiAya R. MurakamiIchiro TayasuHiroyuki TogashiJun-ichi OkanoYoichiro SakaiTomoya IwataMichio KondohNoboru OkudaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Naoto F. Ishikawa Yoshito Chikaraishi Naohiko Ohkouchi Aya R. Murakami Ichiro Tayasu Hiroyuki Togashi Jun-ichi Okano Yoichiro Sakai Tomoya Iwata Michio Kondoh Noboru Okuda Integrated trophic position decreases in more diverse communities of stream food webs
description	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.
format	article
author	Naoto F. Ishikawa Yoshito Chikaraishi Naohiko Ohkouchi Aya R. Murakami Ichiro Tayasu Hiroyuki Togashi Jun-ichi Okano Yoichiro Sakai Tomoya Iwata Michio Kondoh Noboru Okuda
author_facet	Naoto F. Ishikawa Yoshito Chikaraishi Naohiko Ohkouchi Aya R. Murakami Ichiro Tayasu Hiroyuki Togashi Jun-ichi Okano Yoichiro Sakai Tomoya Iwata Michio Kondoh Noboru Okuda
author_sort	Naoto F. Ishikawa
title	Integrated trophic position decreases in more diverse communities of stream food webs
title_short	Integrated trophic position decreases in more diverse communities of stream food webs
title_full	Integrated trophic position decreases in more diverse communities of stream food webs
title_fullStr	Integrated trophic position decreases in more diverse communities of stream food webs
title_full_unstemmed	Integrated trophic position decreases in more diverse communities of stream food webs
title_sort	integrated trophic position decreases in more diverse communities of stream food webs
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/48c8da88b29748da8a02b4ea4b49103c
work_keys_str_mv	AT naotofishikawa integratedtrophicpositiondecreasesinmorediversecommunitiesofstreamfoodwebs AT yoshitochikaraishi integratedtrophicpositiondecreasesinmorediversecommunitiesofstreamfoodwebs AT naohikoohkouchi integratedtrophicpositiondecreasesinmorediversecommunitiesofstreamfoodwebs AT ayarmurakami integratedtrophicpositiondecreasesinmorediversecommunitiesofstreamfoodwebs AT ichirotayasu integratedtrophicpositiondecreasesinmorediversecommunitiesofstreamfoodwebs AT hiroyukitogashi integratedtrophicpositiondecreasesinmorediversecommunitiesofstreamfoodwebs AT junichiokano integratedtrophicpositiondecreasesinmorediversecommunitiesofstreamfoodwebs AT yoichirosakai integratedtrophicpositiondecreasesinmorediversecommunitiesofstreamfoodwebs AT tomoyaiwata integratedtrophicpositiondecreasesinmorediversecommunitiesofstreamfoodwebs AT michiokondoh integratedtrophicpositiondecreasesinmorediversecommunitiesofstreamfoodwebs AT noboruokuda integratedtrophicpositiondecreasesinmorediversecommunitiesofstreamfoodwebs
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Integrated trophic position decreases in more diverse communities of stream food webs

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