Environmental and nutritional factors which regulate population dynamics and toxin production in the dinoflagellate Alexandrium catenella

Siu, Gavin Ka Yu; Young, Maria L. C.; Chan, Dessy

doi:10.1007/978-94-011-5234-1_13

Cited by 38 publications

(46 citation statements)

References 35 publications

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“…In terms of potential nutrient limitation, in these experiments using Kmedium, which has a high surplus of nitrogen, phosphorous is expected to become the main limiting element. Such a role of P-limitation for an increase in toxin accumulation has been found for other toxin dinoflagellates [62][63][64][65][66][67] . There are more indications on factors important for promoting toxin accumulation at reduced/stagnant growth.…”

Section: Toxin Productionsupporting

confidence: 63%

Gambierol: Synthetic Aspects

Fuwa¹

2014

Seafood and Freshwater Toxins

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Section: Toxin Productionsupporting

confidence: 63%

Gambierol: Synthetic Aspects

Fuwa¹

2014

Seafood and Freshwater Toxins

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“…As a result, phosphorus deficiency has been shown to increase greatly the cell toxin contents compared to nutrient-balanced or Ndeficient conditions, either in Alexandrium catenella (Matsuda et al 1996, Siu et al 1997, A. excavatun? (Levasseur et al 1995), A. fundyense (Anderson et al 1990) and A. tamarense (Boyer et al 1987, Anderson et al 1990), or Gyrnnodinium catenatum (Reguera & Oshima 1990).…”

Section: Gtx2 Was the Most Abundant Toxin In Cells Grownmentioning

confidence: 99%

Effect of different nitrogen/phosphorus nutrient ratios on the toxin content in Alexandrium minutum

Béchemin¹,

Grzebyk²,

Hachame³

et al. 1999

Aquat. Microb. Ecol.

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Mexandrium minutum (strain AM89BM) was grown in semi-continuous culture (0.2 volume d-l) in N-limiting (N03:P0, = 1.6 and 3.16), in P-Luniting (N P = 160 and 80), and in N-and P-balanced (N:P = 16) me&a. Daily supplies of limiting nutrients were taken up until exhaustion; most residual concentrations before renewal were near the detection limits. Samples were taken during 2 separate periods: Days 5 to 12 and 26 to 36. During both periods. cells grew at the real rates of 0.23 division d-' in the N:P balanced medium, while the growth rate was decreased in all N:P < 16 or > l 6 media during the first period, and only in the N:P = 1.6 medium during the second period. Cells grown in Nlimiting media contained 1/3 less PON and 1/2 less chlorophyll a than cells grown in the N:P balanced condition. The POP content per cell did not vary significantly. In contrast, P0N:POP ratios in cells grown in P-Limiting conditions were over 50. Thus, cells grown in the 2 N:P < l 6 conditions were nitrogen-deficient, whlle cells grown in N:P = 80 and 160 conditions were nitrogen-surfeit. The toxin content.in cells greatly changed according to the N:P regime. Cells grown at N:P balanced conditions showed an average total paralytic shellfish poisoning (PSP) content of 1.24 fmol ceY-' In N-limiting conations, cells contained ca 3 times less toxin, with mean values of 0.41 to 0.45 fmol cell-'. In contrast, cells grown in P-limiting conditions contained on average 3.5 and 7 times more toxins than under balanced N:P conditions; 4.31 fmol cell-' in the N:P = 160 medium and 8.01 fmol cell-' in the N:P = 80 medium.

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“…Most studies agreed that nitrogen or phosphorus restriction reduced population growth of dinoflagellates (Siu et al, 1997;. However, the dinoflagellate species produce a high amount of toxins under nutrient limitation.…”

Section: Introductionmentioning

confidence: 96%