Data/hora: 01/06/2024 10:36:28

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
País: | France
Título: | Changes in the annual harmful algal blooms of     Alexandrium minutum     : effects of environmental conditions and drainage basin inputs in the Rance estuary (Brittany, France)
Autores: | Le Bec, Claude; Legendre, Aurelie; Messiaen, Gregory.
Data: | 2016-01
Ano: | 2016
Palavras-chave: | Harmful algae; Dinoflagellate; Nutrients; Eutrophication; Drainage basin; Land runoff.
Resumo: | Time series of physico-chemical data and concentrations (cell L-1) of the toxic dinoflagellate Alexandrium minutum collected in the Rance macrotidal estuary (Brittany, France) were analyzed to understand the physico-chemical processes of the estuary and their relation to changes in bloom development from 1996 to 2009. The construction of the tidal power plant in the north and the presence of a lock in the south have greatly altered hydrodynamics, blocking the zone of maximum turbidity upstream, in the narrowest part of the estuary. Alexandrium minutum occurs in the middle part of the estuary. Most physical and chemical parameters of the Rance estuary are similar to those observed elsewhere in Brittany with water temperatures between 15–18 °C, slightly lowered salinities (31.8–33.1 PSU), low river flow rates upstream and significant solar radiation (8 h day-1). A notable exception is phosphate input from the drainage basin which seems to limit bloom development: in recent years, bloom decline can be significantly correlated with the decrease in phosphate input. On the other hand, the chemical processes occurring in the freshwater-saltwater interface do not seem to have an influence on these occurrences. The other hypotheses for bloom declines are discussed, including the prevalence of parasitism, but remain to be verified in further studies.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00341/45257/44698.pdf

DOI:10.1051/alr/2016006

http://archimer.ifremer.fr/doc/00341/45257/

Editor: | Edp Sciences S A
Formato: | application/pdf
Fonte: | Aquatic Living Resources (0990-7440) (Edp Sciences S A), 2016-01 , Vol. 29 , N. 1 , P. -

Fonte:

EDP Sciences 2016

info:eu-repo/semantics/openAccess

restricted use