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Influence of temperature on growth, toxicity and carbohydrate production of a Japanese Ostreopsis ovata strain, a toxic-bloom-forming dinoflagellate
Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences. (Marin Planktonekologi)
Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences. (Marin Planktonekologi)
2012 (English)In: Aquatic Microbial Ecology, ISSN 0948-3055, E-ISSN 1616-1564, Vol. 65, no 3, 261-270 p.Article in journal (Refereed) Published
Abstract [en]

Ostreopsis ovata is a benthic dinoflagellate that produces palytoxin and its analogues.Since the end of the 1990s, toxic blooms of O. ovata have been recorded in many tropicaland temperate marine waters. These blooms often kill benthic invertebrates and cause healthproblems for humans. We hypothesize that increases in seawater temperature might induce theseblooms. A strain of O. ovata isolated from the southern coast of Japan was selected for study. O.ovata cells were exposed to 7 different temperatures from 24 to 30°C for 30 d, and growth rateswere noted. The specific growth rate was found to be highest at 25°C, next highest at 24°C andlower at 26, 28, 27, 30 and 29°C, in that order. The hypothesis that increased seawater temperaturecauses increases in growth rate was thus not supported. The cell toxicity and car bohydrate productionof O. ovata were highest at the temperature range that is optimal for cell growth. Increasesingsea surface temperature, as a result of global warming, is therefore not likely to have asubstantial effect on the bloom formation and toxicity of this Japanese strain of O. ovata.

Place, publisher, year, edition, pages
2012. Vol. 65, no 3, 261-270 p.
Keyword [en]
Ostreopsis ovata · Benthic dinoflagellate · Palytoxin · Toxicity · Climate change · Carbohydrate production
National Category
Ecology
Research subject
Ecology, Aquatic Ecology
Identifiers
URN: urn:nbn:se:lnu:diva-18056DOI: 10.3354/ame01555OAI: oai:DiVA.org:lnu-18056DiVA: diva2:510876
Available from: 2012-03-19 Created: 2012-03-19 Last updated: 2016-12-20Bibliographically approved
In thesis
1. Influence of Human-induced Environmental Changes on the Physiology of the Harmful Benthic Marine Microalga Ostreopsis ovata
Open this publication in new window or tab >>Influence of Human-induced Environmental Changes on the Physiology of the Harmful Benthic Marine Microalga Ostreopsis ovata
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis focus on the influence of human-induced environmental changes on the physiology of Ostreopsis ovata; a toxic, benthic dinoflagellate, which form blooms in tropical and temperate marine waters. O. ovata produces palytoxin and ovatoxins and copious amount of mucilage, all of which have significant negative ecological impacts on the benthic ecosystems where they occur. Understanding the factors affecting O. ovata growth and toxin production is therefore of great importance if we are to understand how this species form such successful blooms. To accomplish this, growth, toxicity, carbohydrate accumulation and related physiological traits of two strains of O. ovata (one from Japanese waters and the other from Mediterranean waters) were studied in laboratory experiments. The cells were grown under the conditions simulating climate-induced changes (higher temperatures and acidification of marine waters) and eutrophication (increase of nitrogen and phosphorus in coastal ecosystems).

O. ovata showed strain-specific responses to the tested environmental changes. Higher temperatures increased growth and reduced the cell toxin quota of the Mediterranean strain while it decreased the growth and toxicity of the Japanese strain. Nutrient (nitrogen-N and phosphorus-P) sufficiency significantly increased O. ovata biomass accumulation. N deficiency markedly decreased the growth while it increased cell toxicity. Lower temperatures (20 - 25 °C) increased the particulate carbohydrate accumulation in both strains. Cell volumes, C (carbon), N and P cell quotas and atomic ratios of O. ovata were significantly higher when grown at 20 °C, than those grown at 30 °C. Acidification did not significantly affect growth and cell toxicity, but increased particulate carbohydrate accumulation. The combined effect of higher temperature and acidification delayed the onset of the blooms by 3 - 5 days, in relation to present temperature and pH conditions.

When extrapolating these results to natural marine ecosystems, it can be inferred that O. ovata occurring in lower-latitudes are growing optimally in the present climate conditions. On the other hand, the strains of O. ovata in higher-latitudes seem to have higher temperature optima than they have now at present conditions. Therefore, further expansion of O. ovata blooms is most likely possible in the warm, eutrophic coastal waters in higher-latitudes.

Place, publisher, year, edition, pages
Växjö: Linnaeus University Press, 2013
Series
Linnaeus University Dissertations, 127/2013
Keyword
Ostreopsis ovata, benthic dinoflagellate, climate change, temperature increase, nutrient enrichment, acidification, physiology, cell growth, cell toxicity, carbohydrate accumulation
National Category
Natural Sciences
Research subject
Natural Science, Aquatic Ecology
Identifiers
urn:nbn:se:lnu:diva-24901 (URN)978-91-87427-17-6 (ISBN)
Public defence
2013-04-26, Fullriggaren, Barlastgatan 11, Kalmar, 09:30 (English)
Opponent
Supervisors
Available from: 2013-04-10 Created: 2013-03-26 Last updated: 2014-02-25Bibliographically approved

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