Data/hora: 01/06/2024 01:01:20

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
País: | France
Título: | Phosphorus limitation might promote more toxin content in the marine invader dinoflagellate Alexandrium minutum
Autores: | Maestrini, Serge; Bechemin, Christian; Grzebyk, Daniel; Hummert, Christian.
Data: | 2000-02
Ano: | 2000
Palavras-chave: | Alexandrium minutum; Phosphorus limitation; Toxin content; PSP.
Resumo: | Alexandrium minutum (strain AM89BM) has been grown in semi-continuous culture (0.2 vol. d super(-1)) in N-limiting (NO sub(3) super(-): PO sub(4) super(3-)=1.6 and 3.16), in P-limiting (N: P=160 and 80), and in N and P balanced (N: P=16) media. The toxin content in cells changed greatly according to the N: P ratio. Cells grown in N: P balanced condition showed an average total paralytic shellfish poisoning (PSP) content of 1.24 fmol cell super(-1). In N-limiting conditions, cells contained ca. 3 times less toxin with mean values of 0.41-0.45 fmol cell super(-1). In contrast, cells grown in P-limiting conditions contained on average 3.5 and 7 times more toxins than in the balanced N: P condition: 4.31 fmol cell super(-1) in the N: P=160 medium and 8.01 fmol cell super(-1) in the N: P=80 medium. The toxin content per carbon unit shows the same trend; the lowest content in N: P&lt;16 conditions was 6.5 fmol PSP nmol C super(-1), whereas in the N: P=16 condition it was 3.3 times higher at 21.8 fmol PSP nmol C super(-1) and 9 times higher in N: P&gt;16 conditions at 59.0 fmol PSP nmol C super(-1). Since present trends in nutrient loading are assumed to have skewed some historically stable situations towards higher N: P ratios, the stimulation of toxin production by P-limiting media has important ecological consequences; in niches where DIN: DIP is &gt;16, populations of A. minutum sufficiently concentrated to represent a significant fraction of shellfish food could pose a serious problem
Tipo: | Text
Idioma: | Inglês
Identificador: | http://archimer.ifremer.fr/doc/00173/28422/26753.pdf
Editor: | The Plankton Society of Japan
Relação: | http://archimer.ifremer.fr/doc/00173/28422/
Formato: | application/pdf
Fonte: | Plankton Biology &amp; Ecology (1343-0874) (The Plankton Society of Japan), 2000-02 , Vol. 47 , N. 1 , P. 7-11
Fonte: | The Plankton Society of Japan 2000