Anthropogenic-induced environmental changes in the Nile-delta and their consequences on molluscan biodiversity and community structure

Global climate changes and anthropogenic pressures have altered many coastal ecosystems worldwide. To understand the consequences of these perturbations on the community structure of the benthic communities, the fauna and the sediments retrieved from a short core in the Manzala Lagoon, which is larg...

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Autor principal:	Ahmed Awad Abdelhady
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Anthropogenic disturbance Molluscan communities Biodiversity loss Coastal ecosystems Mediterranean lagoons Nile-Delta Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/cf65f6f2e3404d469141afddd17dfbb0
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spelling	oai:doaj.org-article:cf65f6f2e3404d469141afddd17dfbb02021-12-01T04:50:39ZAnthropogenic-induced environmental changes in the Nile-delta and their consequences on molluscan biodiversity and community structure1470-160X10.1016/j.ecolind.2021.107654https://doaj.org/article/cf65f6f2e3404d469141afddd17dfbb02021-07-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21003198https://doaj.org/toc/1470-160XGlobal climate changes and anthropogenic pressures have altered many coastal ecosystems worldwide. To understand the consequences of these perturbations on the community structure of the benthic communities, the fauna and the sediments retrieved from a short core in the Manzala Lagoon, which is largest in the Nile Delta, were quantitatively analyzed. The 120 cm long-core represents 170 years. A significant ecosystem shift took place in the upper 41 cm of the lagoon sediments were attributed to hydrodynamic changes, associated with the construction of Aswan High-Dam, where heavy metals concentrations, Pollution Load Index (PLI), and fine-grain sediments were increased. Consequently, the community structure of the benthic fauna was dramatically changed. Currently, the benthic community is dominated by brackish and opportunistic taxa (e.g., Fulvia fragilis, Pirenella conica, Corbicula fluminalis, and Melanoides tuberculata). In contrast, the pre-impact community contains equilibrium freshwater species. These salinity-controlled communities were better characterized on both Bray-Curtis -based Constrained Clustering (CC) and non-Metric Multidimensional Scaling (nMDS). The faunal density and Dominance Index are higher in the top samples, which point either to anthropogenic disturbance or taphonomic (mechanical or chemical) distortion with depths. However, higher species richness in lower samples suggested that the mechanical distortion has not altered the original communities and point to anthropogenic drivers of the diversity loss. Further declining or even extinction of the equilibrium species in the future is expected if no restoration programs implemented soon. Furthermore, nMDS and RMA regression models showed that the distribution of benthic fauna is governed by abiotic factors (e.g., water salinity, metal concentrations, and sediment grain-size). The latter indicates that biotic traits of benthic fauna such as feeding-mode and life-habit are highly sensitive to minor environmental changes and thus can be used as a robust indicator in paleoenvironmental reconstructions.Ahmed Awad AbdelhadyElsevierarticleAnthropogenic disturbanceMolluscan communitiesBiodiversity lossCoastal ecosystemsMediterranean lagoonsNile-DeltaEcologyQH540-549.5ENEcological Indicators, Vol 126, Iss , Pp 107654- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Anthropogenic disturbance Molluscan communities Biodiversity loss Coastal ecosystems Mediterranean lagoons Nile-Delta Ecology QH540-549.5
spellingShingle	Anthropogenic disturbance Molluscan communities Biodiversity loss Coastal ecosystems Mediterranean lagoons Nile-Delta Ecology QH540-549.5 Ahmed Awad Abdelhady Anthropogenic-induced environmental changes in the Nile-delta and their consequences on molluscan biodiversity and community structure
description	Global climate changes and anthropogenic pressures have altered many coastal ecosystems worldwide. To understand the consequences of these perturbations on the community structure of the benthic communities, the fauna and the sediments retrieved from a short core in the Manzala Lagoon, which is largest in the Nile Delta, were quantitatively analyzed. The 120 cm long-core represents 170 years. A significant ecosystem shift took place in the upper 41 cm of the lagoon sediments were attributed to hydrodynamic changes, associated with the construction of Aswan High-Dam, where heavy metals concentrations, Pollution Load Index (PLI), and fine-grain sediments were increased. Consequently, the community structure of the benthic fauna was dramatically changed. Currently, the benthic community is dominated by brackish and opportunistic taxa (e.g., Fulvia fragilis, Pirenella conica, Corbicula fluminalis, and Melanoides tuberculata). In contrast, the pre-impact community contains equilibrium freshwater species. These salinity-controlled communities were better characterized on both Bray-Curtis -based Constrained Clustering (CC) and non-Metric Multidimensional Scaling (nMDS). The faunal density and Dominance Index are higher in the top samples, which point either to anthropogenic disturbance or taphonomic (mechanical or chemical) distortion with depths. However, higher species richness in lower samples suggested that the mechanical distortion has not altered the original communities and point to anthropogenic drivers of the diversity loss. Further declining or even extinction of the equilibrium species in the future is expected if no restoration programs implemented soon. Furthermore, nMDS and RMA regression models showed that the distribution of benthic fauna is governed by abiotic factors (e.g., water salinity, metal concentrations, and sediment grain-size). The latter indicates that biotic traits of benthic fauna such as feeding-mode and life-habit are highly sensitive to minor environmental changes and thus can be used as a robust indicator in paleoenvironmental reconstructions.
format	article
author	Ahmed Awad Abdelhady
author_facet	Ahmed Awad Abdelhady
author_sort	Ahmed Awad Abdelhady
title	Anthropogenic-induced environmental changes in the Nile-delta and their consequences on molluscan biodiversity and community structure
title_short	Anthropogenic-induced environmental changes in the Nile-delta and their consequences on molluscan biodiversity and community structure
title_full	Anthropogenic-induced environmental changes in the Nile-delta and their consequences on molluscan biodiversity and community structure
title_fullStr	Anthropogenic-induced environmental changes in the Nile-delta and their consequences on molluscan biodiversity and community structure
title_full_unstemmed	Anthropogenic-induced environmental changes in the Nile-delta and their consequences on molluscan biodiversity and community structure
title_sort	anthropogenic-induced environmental changes in the nile-delta and their consequences on molluscan biodiversity and community structure
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/cf65f6f2e3404d469141afddd17dfbb0
work_keys_str_mv	AT ahmedawadabdelhady anthropogenicinducedenvironmentalchangesintheniledeltaandtheirconsequencesonmolluscanbiodiversityandcommunitystructure
_version_	1718405750308470784

Anthropogenic-induced environmental changes in the Nile-delta and their consequences on molluscan biodiversity and community structure

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