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Title

Lack of evidence for elevated CO2-induced bottom-up effects on marine copepods: a dinoflagellate-calanoid prey-predator pair

AuthorsIsari, Stamatina ; Zervoudaki, Soultana; Peters, J.; Papantoniou, Georgia; Pelejero, Carles ; Saiz, Enric
KeywordsAcartia grani
Bottom-up
Copepods
Dinoflagellates
Food quality
Heterocapsa
Ocean acidification
pH
Issue DateFeb-2016
PublisherInternational Council for the Exploration of the Sea
CitationICES Journal of Marine Science 73(3): 650-658 (2016)
AbstractRising levels of atmospheric CO2 are responsible for a change in the carbonate chemistry of seawater with associated pH drops (acidification) projected to reach 0.4 units from 1950 to 2100. We investigated possible indirect effects of seawater acidification on the feeding, fecundity, and hatching success of the calanoid copepod Acartia grani, mediated by potential CO2-induced changes in the nutritional characteristics of their prey. We used as prey the autotrophic dinoflagellate Heterocapsa sp., cultured at three distinct pH levels (control: 8.17, medium: 7.96, and low: 7.75) by bubbling pure CO2 via a computer automated system. Acartia grani adults collected from a laboratory culture were acclimatized for 3 d at food suspensions of Heterocapsa from each pH treatment (ca. 500 cells ml−1; 300 μg C l−1). Feeding and egg production rates of the preconditioned females did not differ significantly among the three Heterocapsa diets. Egg hatching success, monitored once per day for the 72 h, did not reveal significant difference among treatments. These results are in agreement with the lack of difference in the cellular stoichiometry (C : N, C : P, and N : P ratios) and fatty acid concentration and composition encountered between the three tested Heterocapsa treatments. Our findings disagree with those of other studies using distinct types of prey, suggesting that this kind of indirect influence of acidification on copepods may be largely associated with interspecific differences among prey items with regard to their sensitivity to elevated CO2 levels
DescriptionSpecial issue: Towards a Broader Perspective on Ocean Acidification Research.-- 9 pages, 4 figures, 3 tables
Publisher version (URL)http://dx.doi.org/10.1093/icesjms/fsv078
URI10261/129672
DOI10.1093/icesjms/fsv078
Identifiersdoi: 10.1093/icesjms/fsv078
issn: 1054-3139
e-issn: 1095-9289
Appears in Collections:(ICM) Artículos
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