The impact of recently excavated dredge pits on coastal hypoxia in the northern Gulf of Mexico shelf

Thompson, Laura J.; Maiti, Kanchan; White, John R.; DuFore, Christopher M.; Liu, Haoran

doi:10.1016/j.marenvres.2020.105199

Cited by 3 publications

(1 citation statement)

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“…7 b). Flow usually passes through the surface layer of the water column, and due to the increased water residence time and biological oxygen consumption by deposited organic matter in the deep layer, the availability of oxygen for benthic invertebrates may be limited at the bottom (Carter et al 2021 ; Thompson et al 2021 ). Adverse effects of such deepened channels on water and sediment quality were observed for limited parameters in this study (e.g., lower DO in water and higher AVS in sediment in the south river).…”

Section: Discussionmentioning

confidence: 99%

Exploring invertebrate indicators of ecosystem health by focusing on the flow transitional zones in a large, shallow eutrophic lake

Hao

Kobayashi

Chen

et al. 2023

Environ Sci Pollut Res

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The river–lake transitional zone provides a unique environment for the biological community and can reduce pollution inputs in lake ecosystems from their catchments. To explore environmental conditions with high purification potential in Lake Taihu and indicator species, we examined the river-to-lake changes in water and sediment quality and benthic invertebrate communities in the transitional zone of four regions. The spatial variations in the environment and invertebrate community observed in this study followed the previously reported patterns in Taihu; the northern and western regions were characterized by higher nutrient concentrations in water, higher heavy metal concentrations in sediment, and higher total invertebrate density and biomass dominated by pollution-tolerant oligochaetes and chironomids. Although nutrient concentrations were low and transparency was high in the eastern region, the taxon richness was the lowest there, which disagreed with the previous findings and might be due to a poor cover of macrophytes in this study. The river-to-lake change was large in the southern region for water quality and the invertebrate community. Water circulation induced by strong wind-wave actions in the lake sites of the southern region is assumed to have promoted photosynthetic and nutrient uptake activities and favored invertebrates that require well-aerated conditions such as polychaetes and burrowing crustaceans. Invertebrates usually adapted to brackish and saline environments are suggested to be indicators of a well-circulated environment with active biogeochemical processes and a less eutrophic state in Taihu, and wind-wave actions are key to maintaining such a community and natural purifying processes.

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Section: Discussionmentioning

confidence: 99%