Benthic ecosystem recovery; Biodiversity; Eutrophication; Hypoxia; Macrozoobenthos; Northwestern shelf of the Black Sea; Ecosystem recoveries; Oceanography
Abstract :
[en] The northwestern shelf of the Black Sea has been affected by eutrophication and bottom hypoxia since the sixties. Consequently, the macrozoobenthos has suffered a well-established decline in biodiversity. However, the nature of the current benthic communities remains questionable. From 1995 to 2017, we compiled species and abiotic data for 138 sites over the shelf. Through an appropriate multivariate analytical approach, we identified benthic community changes solely due to organic pollution variations. Our results show signs of recovery with an increase in biodiversity and proportion of species vulnerable to organic enrichment. These changes were related to a decrease in riverine loads and subsequent eutrophication. However, some long-lived species typical of the area still did not exhibit noticeable recovery, which suggests that either the recovery process has not yet been achieved or some environmental conditions are still not met to warrant a sea floor ecosystem state substantially healthy.
Chevalier, Séverine ; Université de Liège - ULiège > Freshwater and OCeanic science Unit of reSearch (FOCUS)
Beauchard, Olivier; Netherlands Institute for Sea Research and Utrecht University, Department of Estuarine and Delta Systems,Yerseke 4401 NT, the Netherlands
Teacă, Adrian; National Institute for Research and Development on Marine Geology and Geo-ecology - GeoEcoMar, 23-25 Dimitrie Onciul Str., 024053 Bucharest, Romania
Soetaert, Karline; Netherlands Institute for Sea Research and Utrecht University, Department of Estuarine and Delta Systems,Yerseke 4401 NT, the Netherlands
Grégoire, Marilaure ; Université de Liège - ULiège > Freshwater and OCeanic science Unit of reSearch (FOCUS)
Language :
English
Title :
Partial recovery of macrozoobenthos on the northwestern shelf of the Black Sea.
FRIA - Fund for Research Training in Industry and Agriculture [BE]
Funding text :
This work was supported by the F.R.S-FNRS (Fonds de la Recherche Scientifique de Belgique, Communauté Française de Belgique) through funding a FRIA grant. SC and MG acknowledge the support of the EU H2020 BRIDGE-BS project under grant agreement No. 101000240 and EU HE NECCTON project under grant agreement N° 101081273.
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