The seasonality of macroinvertebrate β diversity along the gradient of hydrological connectivity in a dynamic river-floodplain system

Anthropogenic disturbance to natural hydrological connectivity, both longitudinal, lateral, and vertical, is threatening the ecological integrity of the freshwater realm. River-floodplain system is particularly adversely affected by the reduction in lateral hydrological connectivity (LHC), represent...

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Autores principales:	Rui Dong, Yuyu Wang, Cai Lu, Guangchun Lei, Li Wen
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Hydrological connectivity Nestedness Turnover Dispersal ability B-C plots Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/206ba67eac804f45b932b1aaf8b49c88
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spelling	oai:doaj.org-article:206ba67eac804f45b932b1aaf8b49c882021-12-01T04:35:27ZThe seasonality of macroinvertebrate β diversity along the gradient of hydrological connectivity in a dynamic river-floodplain system1470-160X10.1016/j.ecolind.2020.107112https://doaj.org/article/206ba67eac804f45b932b1aaf8b49c882021-02-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X20310517https://doaj.org/toc/1470-160XAnthropogenic disturbance to natural hydrological connectivity, both longitudinal, lateral, and vertical, is threatening the ecological integrity of the freshwater realm. River-floodplain system is particularly adversely affected by the reduction in lateral hydrological connectivity (LHC), representing one of major biodiversity hotspots under increasingly pressure. Many studies have demonstrated that LHC has great influence on the spatial variations of flora and fauna communities (i.e. spatial β diversity) through facilitating dispersal. However, to fully understand the impact of anthropogenic disturbances on biodiversity, we must also understand how ecological communities change over time (i.e. temporal β diversity, TBI) and the underlying processes. To evaluate the processes structuring ecological communities, we examined the macroinvertebrate TBI in habitats along the gradient of LHC for an entire hydrological cycle in West Dongting Lake, a Ramsar-listed floodplain wetland at the middle reach of Yangtze River. Our results showed that the total spatial β diversity fluctuated with water level and peaked at high-water phase, and LHC was the driving forcing affecting both species richness and abundance in all hydrological periods. In particular, species richness and abundance were highest in habitats with medium LHC levels for water-rising and high-water periods reflecting the intermediate disturbance hypothesis except for water-recessing, during which there was no clear pattern. While replacement determined β diversity in most sites at water-rising and high-water phases, the contribution of nestedness were high during water-withdrawing phase. From water-rising to high-water, macroinvertebrates from other habitats spread to the modified mudflats, which had the lowest LHC, along with the floods. During water-withdrawing period, β diversity and its turnover component of all habitats were low compared with other hydrological phases. Temporal β diversity analysis illustrated that the species dispersal was the main mechanism underlying the temporal and spatial variations in the observed community patterns. These findings demonstrated that hydrological connectivity was critical to maintaining the ecological integrity of river-floodplain ecosystems.Rui DongYuyu WangCai LuGuangchun LeiLi WenElsevierarticleHydrological connectivityNestednessTurnoverDispersal abilityB-C plotsEcologyQH540-549.5ENEcological Indicators, Vol 121, Iss , Pp 107112- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Hydrological connectivity Nestedness Turnover Dispersal ability B-C plots Ecology QH540-549.5
spellingShingle	Hydrological connectivity Nestedness Turnover Dispersal ability B-C plots Ecology QH540-549.5 Rui Dong Yuyu Wang Cai Lu Guangchun Lei Li Wen The seasonality of macroinvertebrate β diversity along the gradient of hydrological connectivity in a dynamic river-floodplain system
description	Anthropogenic disturbance to natural hydrological connectivity, both longitudinal, lateral, and vertical, is threatening the ecological integrity of the freshwater realm. River-floodplain system is particularly adversely affected by the reduction in lateral hydrological connectivity (LHC), representing one of major biodiversity hotspots under increasingly pressure. Many studies have demonstrated that LHC has great influence on the spatial variations of flora and fauna communities (i.e. spatial β diversity) through facilitating dispersal. However, to fully understand the impact of anthropogenic disturbances on biodiversity, we must also understand how ecological communities change over time (i.e. temporal β diversity, TBI) and the underlying processes. To evaluate the processes structuring ecological communities, we examined the macroinvertebrate TBI in habitats along the gradient of LHC for an entire hydrological cycle in West Dongting Lake, a Ramsar-listed floodplain wetland at the middle reach of Yangtze River. Our results showed that the total spatial β diversity fluctuated with water level and peaked at high-water phase, and LHC was the driving forcing affecting both species richness and abundance in all hydrological periods. In particular, species richness and abundance were highest in habitats with medium LHC levels for water-rising and high-water periods reflecting the intermediate disturbance hypothesis except for water-recessing, during which there was no clear pattern. While replacement determined β diversity in most sites at water-rising and high-water phases, the contribution of nestedness were high during water-withdrawing phase. From water-rising to high-water, macroinvertebrates from other habitats spread to the modified mudflats, which had the lowest LHC, along with the floods. During water-withdrawing period, β diversity and its turnover component of all habitats were low compared with other hydrological phases. Temporal β diversity analysis illustrated that the species dispersal was the main mechanism underlying the temporal and spatial variations in the observed community patterns. These findings demonstrated that hydrological connectivity was critical to maintaining the ecological integrity of river-floodplain ecosystems.
format	article
author	Rui Dong Yuyu Wang Cai Lu Guangchun Lei Li Wen
author_facet	Rui Dong Yuyu Wang Cai Lu Guangchun Lei Li Wen
author_sort	Rui Dong
title	The seasonality of macroinvertebrate β diversity along the gradient of hydrological connectivity in a dynamic river-floodplain system
title_short	The seasonality of macroinvertebrate β diversity along the gradient of hydrological connectivity in a dynamic river-floodplain system
title_full	The seasonality of macroinvertebrate β diversity along the gradient of hydrological connectivity in a dynamic river-floodplain system
title_fullStr	The seasonality of macroinvertebrate β diversity along the gradient of hydrological connectivity in a dynamic river-floodplain system
title_full_unstemmed	The seasonality of macroinvertebrate β diversity along the gradient of hydrological connectivity in a dynamic river-floodplain system
title_sort	seasonality of macroinvertebrate β diversity along the gradient of hydrological connectivity in a dynamic river-floodplain system
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/206ba67eac804f45b932b1aaf8b49c88
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The seasonality of macroinvertebrate β diversity along the gradient of hydrological connectivity in a dynamic river-floodplain system

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