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Physiological responses of Ostreopsis ovata to changes in N and P availability and temperature increase

Vidyarathna, N. K. and Graneli, Edna LU (2013) In Harmful Algae 21-22. p.54-63
Abstract
Ostreopsis ovata is a benthic dinoflagellate that produces palytoxin and ovatoxins. Blooms of O. ovate causing human health problems and mortality of benthic fauna have been reported from many tropical and temperate marine waters. In the present study we examined the combined effects of temperature and different nutrient conditions on the biochemical composition, growth, toxicity and carbohydrate production of an O. ovata strain originating from the Tyrrhenian Sea. O. ovata cultures with N:P ratios of 1.6, 16 and 160 (N deficient, NP sufficient and P deficient, respectively) were grown at 20 degrees C and 30 degrees C. Biomass accumulation, growth rates, cell volumes, biochemical composition, cell toxicity and carbohydrate production in... (More)
Ostreopsis ovata is a benthic dinoflagellate that produces palytoxin and ovatoxins. Blooms of O. ovate causing human health problems and mortality of benthic fauna have been reported from many tropical and temperate marine waters. In the present study we examined the combined effects of temperature and different nutrient conditions on the biochemical composition, growth, toxicity and carbohydrate production of an O. ovata strain originating from the Tyrrhenian Sea. O. ovata cultures with N:P ratios of 1.6, 16 and 160 (N deficient, NP sufficient and P deficient, respectively) were grown at 20 degrees C and 30 degrees C. Biomass accumulation, growth rates, cell volumes, biochemical composition, cell toxicity and carbohydrate production in each treatment were studied. Results indicated that under nutrient sufficiency O. ovata biomass accumulation increased significantly compared to N and P deficiency and also that N limitation severely affected growth. The highest growth rates were recorded at 30 degrees C. Cellular contents and the atomic ratios of C, N and P were higher in the cells grown at 20 degrees C than in those grown at 30 degrees C. O. ovata cell volumes increased at 20 degrees C. N deficiency significantly increased cell toxicity. Toxicity per cell was higher at 20 degrees C, but per carbon was highest at 30 degrees C. The highest carbohydrate production was found in conditions of N deficiency and at the lower temperature.



Our study suggests that temperature increases due to global warming and nutrient enrichment of coastal waters stimulate the proliferation of O. ovata, particularly for the strains that have become adapted to warm temperate waters. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
categories
Higher Education
in
Harmful Algae
volume
21-22
pages
54 - 63
publisher
Elsevier
external identifiers
  • scopus:84872282899
ISSN
1878-1470
DOI
10.1016/j.hal.2012.11.006
language
English
LU publication?
no
id
86519979-deaa-465c-abfa-f3c0b6b1b5d6 (old id 7994215)
date added to LUP
2015-09-29 11:31:53
date last changed
2019-01-20 03:18:58
@article{86519979-deaa-465c-abfa-f3c0b6b1b5d6,
  abstract     = {Ostreopsis ovata is a benthic dinoflagellate that produces palytoxin and ovatoxins. Blooms of O. ovate causing human health problems and mortality of benthic fauna have been reported from many tropical and temperate marine waters. In the present study we examined the combined effects of temperature and different nutrient conditions on the biochemical composition, growth, toxicity and carbohydrate production of an O. ovata strain originating from the Tyrrhenian Sea. O. ovata cultures with N:P ratios of 1.6, 16 and 160 (N deficient, NP sufficient and P deficient, respectively) were grown at 20 degrees C and 30 degrees C. Biomass accumulation, growth rates, cell volumes, biochemical composition, cell toxicity and carbohydrate production in each treatment were studied. Results indicated that under nutrient sufficiency O. ovata biomass accumulation increased significantly compared to N and P deficiency and also that N limitation severely affected growth. The highest growth rates were recorded at 30 degrees C. Cellular contents and the atomic ratios of C, N and P were higher in the cells grown at 20 degrees C than in those grown at 30 degrees C. O. ovata cell volumes increased at 20 degrees C. N deficiency significantly increased cell toxicity. Toxicity per cell was higher at 20 degrees C, but per carbon was highest at 30 degrees C. The highest carbohydrate production was found in conditions of N deficiency and at the lower temperature. <br/><br>
<br/><br>
Our study suggests that temperature increases due to global warming and nutrient enrichment of coastal waters stimulate the proliferation of O. ovata, particularly for the strains that have become adapted to warm temperate waters.},
  author       = {Vidyarathna, N. K. and Graneli, Edna},
  issn         = {1878-1470},
  language     = {eng},
  pages        = {54--63},
  publisher    = {Elsevier},
  series       = {Harmful Algae},
  title        = {Physiological responses of Ostreopsis ovata to changes in N and P availability and temperature increase},
  url          = {http://dx.doi.org/10.1016/j.hal.2012.11.006},
  volume       = {21-22},
  year         = {2013},
}