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Lack of evidence for elevated CO2-induced bottom-up effects on marine copepods

AutorIsari, Stamatina ; Zervoudaki, Soultana; Peters, J.; Papantoniou, Georgia; Pelejero, Carles ; Saiz, Enric
Fecha de publicación18-nov-2014
Citación2nd International Ocean Research Conference (2014)
ResumenRising 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 by 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, low: 7.75) by bubbling pure CO2 via computer automated system. Feeding and egg production rates of A. grani, after a 3-day preconditioning period at food suspensions of ca. 500 cells mL-1 (ca. 300 μg C L-1), 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. Additionally, pH shifts in the water where the eggs were incubated had no significant effect on the hatching rate. 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 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 to interspecific differences among prey items with regard to their sensitivity to elevated CO2 levels
Descripción2nd International Ocean Research Conference, One planet one ocean, 17-21 November 2014, Barcelona, Spain
Versión del editorhttp://www.iocunesco-oneplanetoneocean.fnob.org/
Aparece en las colecciones: (ICM) Comunicaciones congresos
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