Identifying community thresholds for lotic benthic diatoms in response to human disturbance

Abstract Although human disturbance indirectly influences lotic assemblages through modifying physical and chemical conditions, identifying thresholds of human disturbance would provide direct evidence for preventing anthropogenic degradation of biological conditions. In the present study, we used d...

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Autores principales:	Tao Tang, Ting Tang, Lu Tan, Yuan Gu, Wanxiang Jiang, Qinghua Cai
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c36a35bb1cd24a3b84d5e3941c2b80c3
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spelling	oai:doaj.org-article:c36a35bb1cd24a3b84d5e3941c2b80c32021-12-02T11:53:02ZIdentifying community thresholds for lotic benthic diatoms in response to human disturbance10.1038/s41598-017-04445-72045-2322https://doaj.org/article/c36a35bb1cd24a3b84d5e3941c2b80c32017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04445-7https://doaj.org/toc/2045-2322Abstract Although human disturbance indirectly influences lotic assemblages through modifying physical and chemical conditions, identifying thresholds of human disturbance would provide direct evidence for preventing anthropogenic degradation of biological conditions. In the present study, we used data obtained from tributaries of the Three Gorges Reservoir in China to detect effects of human disturbance on streams and to identify disturbance thresholds for benthic diatoms. Diatom species composition was significantly affected by three in-stream stressors including TP, TN and pH. Diatoms were also influenced by watershed % farmland and natural environmental variables. Considering three in-stream stressors, TP was positively influenced by % farmland and % impervious surface area (ISA). In contrast, TN and pH were principally affected by natural environmental variables. Among measured natural environmental variables, average annual air temperature, average annual precipitation, and topsoil % CaCO3, % gravel, and total exchangeable bases had significant effects on study streams. When effects of natural variables were accounted for, substantial compositional changes in diatoms occurred when farmland or ISA land use exceeded 25% or 0.3%, respectively. Our study demonstrated the rationale for identifying thresholds of human disturbance for lotic assemblages and addressed the importance of accounting for effects of natural factors for accurate disturbance thresholds.Tao TangTing TangLu TanYuan GuWanxiang JiangQinghua CaiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tao Tang Ting Tang Lu Tan Yuan Gu Wanxiang Jiang Qinghua Cai Identifying community thresholds for lotic benthic diatoms in response to human disturbance
description	Abstract Although human disturbance indirectly influences lotic assemblages through modifying physical and chemical conditions, identifying thresholds of human disturbance would provide direct evidence for preventing anthropogenic degradation of biological conditions. In the present study, we used data obtained from tributaries of the Three Gorges Reservoir in China to detect effects of human disturbance on streams and to identify disturbance thresholds for benthic diatoms. Diatom species composition was significantly affected by three in-stream stressors including TP, TN and pH. Diatoms were also influenced by watershed % farmland and natural environmental variables. Considering three in-stream stressors, TP was positively influenced by % farmland and % impervious surface area (ISA). In contrast, TN and pH were principally affected by natural environmental variables. Among measured natural environmental variables, average annual air temperature, average annual precipitation, and topsoil % CaCO3, % gravel, and total exchangeable bases had significant effects on study streams. When effects of natural variables were accounted for, substantial compositional changes in diatoms occurred when farmland or ISA land use exceeded 25% or 0.3%, respectively. Our study demonstrated the rationale for identifying thresholds of human disturbance for lotic assemblages and addressed the importance of accounting for effects of natural factors for accurate disturbance thresholds.
format	article
author	Tao Tang Ting Tang Lu Tan Yuan Gu Wanxiang Jiang Qinghua Cai
author_facet	Tao Tang Ting Tang Lu Tan Yuan Gu Wanxiang Jiang Qinghua Cai
author_sort	Tao Tang
title	Identifying community thresholds for lotic benthic diatoms in response to human disturbance
title_short	Identifying community thresholds for lotic benthic diatoms in response to human disturbance
title_full	Identifying community thresholds for lotic benthic diatoms in response to human disturbance
title_fullStr	Identifying community thresholds for lotic benthic diatoms in response to human disturbance
title_full_unstemmed	Identifying community thresholds for lotic benthic diatoms in response to human disturbance
title_sort	identifying community thresholds for lotic benthic diatoms in response to human disturbance
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/c36a35bb1cd24a3b84d5e3941c2b80c3
work_keys_str_mv	AT taotang identifyingcommunitythresholdsforloticbenthicdiatomsinresponsetohumandisturbance AT tingtang identifyingcommunitythresholdsforloticbenthicdiatomsinresponsetohumandisturbance AT lutan identifyingcommunitythresholdsforloticbenthicdiatomsinresponsetohumandisturbance AT yuangu identifyingcommunitythresholdsforloticbenthicdiatomsinresponsetohumandisturbance AT wanxiangjiang identifyingcommunitythresholdsforloticbenthicdiatomsinresponsetohumandisturbance AT qinghuacai identifyingcommunitythresholdsforloticbenthicdiatomsinresponsetohumandisturbance
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Identifying community thresholds for lotic benthic diatoms in response to human disturbance

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