Relationship between water quality and phytoplankton distribution of aquaculture areas in a tropical lagoon.

Autor: Hoang TMH; Archaeology, Environmental Changes and Geo-Chemistry (AMGC), Vrije Universiteit Brussel, Brussels, Belgium. htmhang@hueuni.edu.vn.; Faculty of Environmental Science, University of Sciences, Hue University, Hue, Vietnam. htmhang@hueuni.edu.vn., Te MS; Faculty of Environmental Science, University of Sciences, Hue University, Hue, Vietnam.; Graduate School of Integrated Science and Technology, Nagasaki University, Nagasaki, Japan., Hieu Duong V; Faculty of Environmental Science, University of Sciences, Hue University, Hue, Vietnam., Luong QD; Faculty of Biology, University of Sciences, Hue University, Hue, Vietnam., Stiers I; Department of Biology, Vrije Universiteit Brussel, Brussels, Belgium.; Multidisciplinair Instituut Lerarenopleiding (MILO), Brussels Institute for Teacher Education (BRITE), Vrije Universiteit Brussel, Brussels, Belgium., Triest L; Department of Biology, Vrije Universiteit Brussel, Brussels, Belgium.; Systems Ecology and Resource Management Research Unit, Department of Organism Biology, Université Libre de Bruxelles, Brussels, Belgium.
Jazyk: angličtina
Zdroj: Environmental monitoring and assessment [Environ Monit Assess] 2024 Oct 24; Vol. 196 (11), pp. 1099. Date of Electronic Publication: 2024 Oct 24.
DOI: 10.1007/s10661-024-13245-2
Abstrakt: Aquaculture activities can affect water quality and phytoplankton composition. Our study estimated phytoplankton density and composition relating to aquaculture-impacted environmental factors. We analyzed water quality and phytoplankton at 35 sites in a tropical brackish lagoon, including inside aquaculture ponds (integrated farming of fish, shrimp, and crab), at wastewater discharge points, within 300 m of these points, and farther out in the lagoon. Measurements were taken after aquaculture activities started in March and again in July. In both periods, total nitrogen (TN), total phosphorus (TP), chlorophyll-a (Chl-a), and turbidity decreased from the aquaculture ponds to the farther lagoon areas. Principal component analysis showed that nutrients, turbidity, and Chl-a were critical factors in aquaculture ponds, while salinity, temperature, pH, dissolved oxygen (DO), and water depth influenced water quality outside the ponds. Phytoplankton density was higher in July than in March due to aquaculture characteristics. Redundancy analysis indicated that phytoplankton, typical of inorganic, turbid, shallow lakes, was present throughout, whereas marine phytoplankton characterized the open water area (OWA). Marine phytoplankton caused a higher Shannon-Wiener index in July compared to March for OWA. Phytoplankton in aquaculture ponds was dominated by Oscillatoria spp., while Thalassiosira spp. dominated outside the ponds. We also identified indicator genera for two connected lagoons. Although constant water exchange prevented identifying specific indicator phytoplankton groups for aquaculture, this revealed the impact of wastewater from aquaculture ponds on the natural environment in the lagoons. Research on phytoplankton communities is necessary for the sustainable development of aquaculture and environmental management in coastal lagoons.
(© 2024. The Author(s), under exclusive licence to Springer Nature Switzerland AG.)
Databáze: MEDLINE
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