Response of macrobenthic communities to changes in water quality in a subtropical, microtidal estuary (Oso Bay, Texas)

Santiago, Kevin De; Palmer, Terence A.; Wetz, Michael S.; Pollack, Jennifer Beseres; Linløkken, Arne

doi:10.1017/exp.2020.44

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…The major difference between S3 and other stations was the point source pollution, which led to a transformation in the fauna and community structure of macro‐invertebrates from Beatidae and Caenidae to Chironomidae and Simuliidae. In the study by De Santiago et al (de Santiago et al, 2020 ), the macrobenthic communities were examined in response to point sources of pollution in the subtropical regions of the Gulf of Oso. As per their results, the increase in the sewage discharge into the western Gulf, a distinct change in the community structure was raised, and the Ostracoda and oligochaete classes were dominated in the area.…”

Section: Discussionmentioning

confidence: 99%

Ecological indicators for qualitative assessment of Ojarud River: A case study

Mobasher,

Bayrami,

Asadi‐Sharif

et al. 2023

Ecology and Evolution

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Section: Discussionmentioning

confidence: 99%

Ecological indicators for qualitative assessment of Ojarud River: A case study

Mobasher,

Bayrami,

Asadi‐Sharif

et al. 2023

Ecology and Evolution

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“…Changes often associated with reduced water quality include decreased species richness, abundance and diversity (Wang et al, 1997;Selleslagh and Amara, 2008;Valesini et al, 2017;Calle et al, 2018;Duque et al, 2020;Flipo et al, 2020). Community composition and functional attribute changes may follow if the conditions persist and are often best identified over longer temporal scales (de Santiago et al, 2020;Flipo et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Decadal changes in land-use, water quality and fish assemblages in a KwaZulu-Natal urban and non-urban estuary.

Van Schoor

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Globally, estuaries are recognised as highly dynamic environments which support diverse and productive flora and fauna, and provide numerous goods and services for human wellbeing.These systems are under threat from growing coastal populations that demand the transformation of natural land to accommodate urbanisation, agriculture, harbour, and infrastructure developments. Direct and indirect land-use/land-cover (LULC) changes adversely affect estuarine water quality, directly impacting estuarine biota such as fishes.While the short links between these components are known, few studies have attempted to integrate these links, particularly within the South African context. Therefore, this study aimed to integrate different levels of assessment (LULC and estuarine water quality) to describe changes in estuarine fish ecology over space and time. The study compared two permanently open estuaries in KwaZulu-Natal with distinct land-cover types, namely the uMgeni and uMlalazi estuaries. The uMgeni Estuary is surrounded by urban features and is situated in a highly developed catchment, whereas the uMlalazi is near-natural, with some surrounding agricultural areas.Historical land-cover imagery from the estuary to the 20 m topographical contour (inclusive of the Estuary Functional Zone), the estuary catchment land-cover, water quality and ichthyofauna data were collected. Land-cover types were grouped into eight categories and 42 feature classes based on modifications to the South African National Land Cover system, the United States Geological Survey and the Coastal Change Analysis Program. Multivariate statistical analysis identified two distinct groupings of land-cover types, Period 1 (before 1989) and Period 2 (during and after 1989). This period factor was then further used throughout the study to determine associated (temporal) responses in water quality and fish assemblages. Strong negative correlations were observed between dissolved oxygen and artificial land-cover types in the uMgeni Estuary. The results suggested that the uMgeni Estuary receives nutrient inputs from various urban activities, which reduce oxygen levels within the water column. Alterations to the hierarchical ichthyofauna structure in the uMgeni occurred on a year to year basis, relative to these anthropogenic impacts. In contrast, good water quality likely associated with fewer developments within the Estuarine Functional Zone has allowed the hierarchical fish structure in the uMlalazi Estuary to remain the same over time, although minor species level differences have occurred.

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Taxonomic and functional structure of macrobenthic invertebrate communities and their response to environmental variables along the subbranches of the Nile River (rayahs), Egypt

Bendary

Ibrahim

Goher

et al. 2022

Environ Sci Pollut Res

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Macrobenthic invertebrate communities serve as markers of anthropogenic stress in freshwater ecosystems. In this study, 17 sampling sites were selected from two Nile river subbranches (El-Rayah El-Behery and El-Rayah El-Nassery) and subjected to different anthropogenic influences to explore the ecological environment and characteristics of macrobenthos communities. Macrobenthos were studied using taxonomic diversity and biological trait analysis to investigate how human activity and variation in water quality affect their structure and function. A total of 37 taxa represented by 43,389 individuals were recognized. The communities are composed chiefly of Oligochaeta and aquatic insects. Multivariate statistical analyses found that the most influential environmental variables in the structural and functional community were sodium, dissolved oxygen, silicate, pH, calcium, and cadmium. At high levels of pollution, notably sewage and industrial pollution in the northern part of El-Rayah El-Behery, characteristics such as larger body size, detritus feeders, burrowers, and high tolerance to pollution predominated, whereas at low levels of pollution, features such as small body sizes, scraper and predator feeders, intolerant and fairly tolerant of pollution, and climber and swimmer mobility are predominant. The results confirm our prediction that the distribution of macroinvertebrate traits varies spatially in response to environmental changes. The diversity-based method distinguished impacted sewage and industrial sites from thermal effluent sites, while the trait-based approach illustrated an apparent variance between the ecological status of contaminated regions. Therefore, the biological features should be employed in addition to structural aspects for assessing the biodiversity of macroinvertebrate communities under environmental stressors.

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Response of macrobenthic communities to changes in water quality in a subtropical, microtidal estuary (Oso Bay, Texas)

Cited by 4 publications

References 11 publications

Ecological indicators for qualitative assessment of Ojarud River: A case study

Ecological indicators for qualitative assessment of Ojarud River: A case study

Decadal changes in land-use, water quality and fish assemblages in a KwaZulu-Natal urban and non-urban estuary.

Taxonomic and functional structure of macrobenthic invertebrate communities and their response to environmental variables along the subbranches of the Nile River (rayahs), Egypt

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