Water chemistry and substrate type as major determinants of molluscan feeding habit and life–mode in lagoon sediments

Abdelhady, Ahmed Awad; Khalil, Mahmoud M.; Ismail, Esam; Fan, Jiawei; Zhang, Shengrui; Xiao, Jinchong

doi:10.1016/j.ecss.2019.02.019

Cited by 31 publications

(10 citation statements)

References 39 publications

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“…In Egypt, Lake Manzala is a vital fisheries resource in the Nile River Delta, accounting for over 30 percent of all commercial and recreational fish landed and consumed in Egypt [45]. However, Lake Manzala has been classified as one of the most polluted lakes in Egypt [46,47].…”

Section: Study Area and Samplingmentioning

confidence: 99%

Morphological Variation between Life and Death Gastropod Populations in the Nile Delta: A Pollution-Induced Evolution

Abdelhady,

Husain,

Samy-Kamal

et al. 2023

Water

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Wetland ecosystems of the Nile Delta face severe threats due to natural climatic changes and anthropogenic activities. Life and death assemblage comparisons can be implemented as a historical record to detect anthropogenic-induced environmental changes in the past few decades. A geometric morphometric approach was applied to quantify the pollution-induced morphological variation between life and death populations of the gastropod Melanoides tuberculata. The results indicated that life populations differ significantly from the death ones, where the first tend to be much smaller, more globular, and with a depressed aperture and whorl section. In addition, the phenetic diversity of the life populations was also decreased, and the allometric growth was shifted. These morphological changes in the life populations are well-known adaptations for reducing the cost of shell maintenance in polluted water. No distinct morphospace was found between life populations from different habitats, suggesting that habitats have no significant role in the current pollution-induced evolution.

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Section: Study Area and Samplingmentioning

confidence: 99%

Morphological Variation between Life and Death Gastropod Populations in the Nile Delta: A Pollution-Induced Evolution

Abdelhady,

Husain,

Samy-Kamal

et al. 2023

Water

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“…Pollutants in both water and sediments will be enter the geochemical cycle, absorbed by the benthic fauna and hence, reached shes and humans (Dean et al 2007, Ryu et al 2011, O'Brien and Keough 2013, Chariton et al 2015. Pollution of aquatic environment possess a high risk to the biodiversity (Rodrigues et al 2017, Abdelhady et al 2019a, Mosbahi et al 2019 A fundamental problem of the trace metals is their resistance to biodegradation and once entered the aquatic environment they are redistributed throughout the water column, accumulated in sediments and consumed by biota (Abdelhady et al 2019b, Long et al 1996, Fichet et al 1998. Spatial distribution of the trace metals is critical for differentiating natural concentrations from introduced anthropogenically (Galloway 1979, Long et al 1996, Hatje et al 2001, Korfali and Davies 2003.…”

Section: Temporal Changes and Ecological Riskmentioning

confidence: 99%

Heavy metals in the sediments of the Nile Delta: Anthropogenic-induced hydrologic changes

Abdelhady¹,

Salem²,

Khalil³

2021

Preprint

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Aquatic ecosystems act directly or indirectly as sinks for heavy metals, which persists for longer times in the biogeochemical cycle and poses high ecological risks and thus, it represents a major worldwide concern. To evaluate the metal contamination in the Nile Delta, twenty sites along both Rosetta and Damietta branches were investigated. Most heavy metals concentrations are above the sediments quality guidelines. The Contamination Factor (CF), Pollution Load index (PLI), and geo-accumulation index (I geo) indicated that the sediments are moderately to extremely polluted by Ni, Cd, Cr, Cu, Pb, and Zn. A trend of increasing metals concentration towards the Mediterranean was observed and attributed to historical sinking of heavy metals in the sediment, where many agricultural drains bringing mixed wastewater. Cluster analyses support the latter and indicated that the heavy metals, which clustered together, may have the same source (i.e. anthropogenic). Non-metric Multidimensional Scaling, Analysis of Similarity (ANOSIM), and Partial Least Square (PLS) regression confirmed that the distance along the river is the major predictor of the observed metal concentrations, while sediment grain–size has no or very minor effect. The lower hydrodynamics associated with the construction of Aswan High-Dam in 1964 and the developed agricultural system in addition to arid climate with scarce rainfall, all leave no chance for natural annual flooding. Therefore, freshening up of the sediments was prohibited. The marinating of well-controlled flooding may erode the upper contaminated portion of river sediments, dilute the metal concentrations, and improve the sediments quality.

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“…Every year, millions of birds including raptors, waterbirds, Palearctic birds and passerines migrate between Europe and Africa, where the wetlands north of the Nile Delta are critical stopover sites (Fishar, 2018), especially given the desert environment surrounding the Delta. Engineering structures along the Nile River and degradation of water quality in the Delta’s lagoons, due to receiving industrial wastes and municipal effluents (Gu et al., 2013), significantly affect the biodiversity in these lagoons (e.g., fish and benthic fauna; Abdelhady, Khalil, Ismail, Fan, et al., 2019) and thus can seriously threaten the integrity of migration movements along the East Africa Flyway.…”

Section: Introductionmentioning

confidence: 99%

“…However, anthropogenic agricultural (i.e., heavy metals occur naturally in agricultural soils and in source materials of fertilizers), industrial and domestic (i.e., sourced from household discharges and human urine and faeces; Koch & Rotard, 2001) sources remain the main source of heavy metal pollution in many regions worldwide (Vareda et al., 2019). These metals typically are discharged into aquatic environments, suspend in the water column, sink into the bottom sediments, and then enter the food chain through plant uptake, benthic organisms and fish and ultimately reach humans (Abdelhady, Khalil, Ismail, Fan, et al., 2019; Gaaloul et al., 2022; Rainbow, 1995). The high concentrations of heavy metals such as Cd, Cr, Cu, Pb, Ni, and Zn are carcinogenic and can pose adverse effects on plant and human health.…”

Section: Introductionmentioning

confidence: 99%

Irreversible and Large‐Scale Heavy Metal Pollution Arising From Increased Damming and Untreated Water Reuse in the Nile Delta

et al. 2023

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Egypt observes one of the highest water budget deficits in Africa that is mainly compensated by intensive reuse of untreated agricultural drainage water in the Nile Delta. The implications of untreated water reuse on increasing soil pollution levels remain poorly characterized; however, a large‐scale pollution can compromise crop production and water quality. To address this deficiency, we evaluate the level of heavy metal pollution in the Nile Delta, identify its sources and explore the implications of damming on heavy metal concentration using integrated pollution indicators and statistical modeling. Pollution indicators show moderate to very high contamination by Pb, Ni, Cr, Cd, Cu, and Zn, with unprecedented Cd levels in the sediments (up to 72.0 ppm) and a northward increase in pollution levels. Statistical modeling and historical datasets reveal the association of Cd and Fe on both Nile branches and the clustering of Pb, Ni, Cu, Zn and Cr, which attribute the heavy metal concentrations to the cumulative addition of untreated agricultural drainage water (9.5 BCM/yr) and wastewater. These processes introduced an accelerated pollution in the Nile Delta system. Though, conservation measures are crucial to reverse this degradation, yet the increasingly engineered Nile flow, the low gradient of the delta and the active silting impede heavy metal flushing causing irreversible pollution. Our findings alarm future increase in heavy metal pollution in response to increased untreated drainage water reuse to mitigate the impacts of ongoing upstream damming and call for implementing international cooperative agreements for integrated water management along the Nile River.

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Water chemistry and substrate type as major determinants of molluscan feeding habit and life–mode in lagoon sediments

Cited by 31 publications

References 39 publications

Morphological Variation between Life and Death Gastropod Populations in the Nile Delta: A Pollution-Induced Evolution

Morphological Variation between Life and Death Gastropod Populations in the Nile Delta: A Pollution-Induced Evolution

Heavy metals in the sediments of the Nile Delta: Anthropogenic-induced hydrologic changes

Irreversible and Large‐Scale Heavy Metal Pollution Arising From Increased Damming and Untreated Water Reuse in the Nile Delta

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