Trophic structure in response to land use in subtropical streams

Land use in the uplands can substantially impact the biological community in stream ecosystems, but how the trophic structure of aquatic communities within riverine food webs respond to catchment land use changes within their respective catchment remains unclear. Here, we investigated the impact of...

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Autores principales:	Yang Wang, Yintao Jia, Zhengfei Li, Juan Tao, Liqun Lin, Kang Chen, Zhenyuan Liu, Xiang Tan, Quanfa Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Aquatic organisms Diet estimation Trophic diversity Riverine food web Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/22446ed321e7425fa0a211690ebf8df3
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spelling	oai:doaj.org-article:22446ed321e7425fa0a211690ebf8df32021-12-01T04:52:36ZTrophic structure in response to land use in subtropical streams1470-160X10.1016/j.ecolind.2021.107746https://doaj.org/article/22446ed321e7425fa0a211690ebf8df32021-08-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21004118https://doaj.org/toc/1470-160XLand use in the uplands can substantially impact the biological community in stream ecosystems, but how the trophic structure of aquatic communities within riverine food webs respond to catchment land use changes within their respective catchment remains unclear. Here, we investigated the impact of land use on aquatic communities in two streams in subtropical China. We measured isotopic compositions of basal resources, four macroinvertebrate functional feeding groups (scrapers, collectors, shredders, and predators with 132 taxa), and three fish functional feeding groups (herbivores, omnivores, and piscivores with 26 species) in three land uses (woodland, agricultural, and urban). Isotopic values of δ13C and δ15N were used to estimate the dietary proportions of consumers (macroinvertebrates and fish) and community-level metrics (niche width and trophic diversity). We found that isotopic values of basal resources, macroinvertebrates, and fish varied significantly among sampling sites adjacent to the three land uses. Dietary analysis showed that terrestrial resources contributed relatively less (~20%) than aquatic resources to consumers (macroinvertebrates and fish) in higher trophic levels, especially in the urban sites. Compared to woodland sites, food webs in the urban sites had lower niche width and higher trophic redundancy, and agricultural sites had higher trophic length and lower niche width. Trophic structure alterations in response to land use primarily resulted from availability and variability of basal resources in the upstream river channel and the riparian zone, and also the feeding plasticity of macroinvertebrates and/or fish. These empirical findings indicate the importance of diversity across all trophic levels in the management of stream ecosystems in urban and agricultural landscapes.Yang WangYintao JiaZhengfei LiJuan TaoLiqun LinKang ChenZhenyuan LiuXiang TanQuanfa ZhangElsevierarticleAquatic organismsDiet estimationTrophic diversityRiverine food webEcologyQH540-549.5ENEcological Indicators, Vol 127, Iss , Pp 107746- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Aquatic organisms Diet estimation Trophic diversity Riverine food web Ecology QH540-549.5
spellingShingle	Aquatic organisms Diet estimation Trophic diversity Riverine food web Ecology QH540-549.5 Yang Wang Yintao Jia Zhengfei Li Juan Tao Liqun Lin Kang Chen Zhenyuan Liu Xiang Tan Quanfa Zhang Trophic structure in response to land use in subtropical streams
description	Land use in the uplands can substantially impact the biological community in stream ecosystems, but how the trophic structure of aquatic communities within riverine food webs respond to catchment land use changes within their respective catchment remains unclear. Here, we investigated the impact of land use on aquatic communities in two streams in subtropical China. We measured isotopic compositions of basal resources, four macroinvertebrate functional feeding groups (scrapers, collectors, shredders, and predators with 132 taxa), and three fish functional feeding groups (herbivores, omnivores, and piscivores with 26 species) in three land uses (woodland, agricultural, and urban). Isotopic values of δ13C and δ15N were used to estimate the dietary proportions of consumers (macroinvertebrates and fish) and community-level metrics (niche width and trophic diversity). We found that isotopic values of basal resources, macroinvertebrates, and fish varied significantly among sampling sites adjacent to the three land uses. Dietary analysis showed that terrestrial resources contributed relatively less (~20%) than aquatic resources to consumers (macroinvertebrates and fish) in higher trophic levels, especially in the urban sites. Compared to woodland sites, food webs in the urban sites had lower niche width and higher trophic redundancy, and agricultural sites had higher trophic length and lower niche width. Trophic structure alterations in response to land use primarily resulted from availability and variability of basal resources in the upstream river channel and the riparian zone, and also the feeding plasticity of macroinvertebrates and/or fish. These empirical findings indicate the importance of diversity across all trophic levels in the management of stream ecosystems in urban and agricultural landscapes.
format	article
author	Yang Wang Yintao Jia Zhengfei Li Juan Tao Liqun Lin Kang Chen Zhenyuan Liu Xiang Tan Quanfa Zhang
author_facet	Yang Wang Yintao Jia Zhengfei Li Juan Tao Liqun Lin Kang Chen Zhenyuan Liu Xiang Tan Quanfa Zhang
author_sort	Yang Wang
title	Trophic structure in response to land use in subtropical streams
title_short	Trophic structure in response to land use in subtropical streams
title_full	Trophic structure in response to land use in subtropical streams
title_fullStr	Trophic structure in response to land use in subtropical streams
title_full_unstemmed	Trophic structure in response to land use in subtropical streams
title_sort	trophic structure in response to land use in subtropical streams
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/22446ed321e7425fa0a211690ebf8df3
work_keys_str_mv	AT yangwang trophicstructureinresponsetolanduseinsubtropicalstreams AT yintaojia trophicstructureinresponsetolanduseinsubtropicalstreams AT zhengfeili trophicstructureinresponsetolanduseinsubtropicalstreams AT juantao trophicstructureinresponsetolanduseinsubtropicalstreams AT liqunlin trophicstructureinresponsetolanduseinsubtropicalstreams AT kangchen trophicstructureinresponsetolanduseinsubtropicalstreams AT zhenyuanliu trophicstructureinresponsetolanduseinsubtropicalstreams AT xiangtan trophicstructureinresponsetolanduseinsubtropicalstreams AT quanfazhang trophicstructureinresponsetolanduseinsubtropicalstreams
_version_	1718405712564977664

Trophic structure in response to land use in subtropical streams

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