TY - JOUR
T1 - Dynamic stoichiometric response to food quality fluctuations in the heterotrophic dinoflagellate Oxyrrhis marina
AU - Meunier, Cédric Léo
AU - Haafke, Julia
AU - Oppermann, Bettina
AU - Boersma, Maarten
AU - Malzahn, Arne Michael
N1 - Funding Information:
Acknowledgments This study is a part of the PhD study conducted by C.L.M. at the Biologische Anstalt Helgoland, Alfred-Wegener-Institut Bremerhaven, Germany, financed by the Deutsche Fors-chungsgemeinschaft (DFG, grant MA 4501/1-1) and complies with current German laws and regulations on animal studies. We thank Stefanie Schnell for her help measuring respiration rates of O. marina.
PY - 2012/10
Y1 - 2012/10
N2 - With respect to nutrients, plants are rather non-homoeostatic while most metazoans have much more confined ranges of nutrient ratios. It was recently highlighted that the homoeostatic ability of microzooplankters lies in between these two extremes. Nevertheless, we know very little on the dynamics of stoichiometric changes. Hence, we investigated how the stoichiometry of the heterotrophic dinoflagellate Oxyrrhis marina is affected (1) during a starvation period and (2) when fed nutrient deplete Rhodomonas salina after having been pre-conditioned on nutrient replete algae and vice versa. We observed that the dinoflagellate was able to maintain its N:P ratio constant over 78 h of starvation. We inferred that under starvation, nitrogen-limited O. marina mainly used fat as energy source while nitrogen-rich individuals also used proteins as fuel in cellular respiration. Further, we showed that O. marina presents resistance to nutrient limitation, with stronger regulation against P-limitation than against N-limitation. This resilience in microzooplankton stoichiometry following food quality stress would have great implications for both top-down (nutrient remineralisation) and bottom-up controls (quality as food).
AB - With respect to nutrients, plants are rather non-homoeostatic while most metazoans have much more confined ranges of nutrient ratios. It was recently highlighted that the homoeostatic ability of microzooplankters lies in between these two extremes. Nevertheless, we know very little on the dynamics of stoichiometric changes. Hence, we investigated how the stoichiometry of the heterotrophic dinoflagellate Oxyrrhis marina is affected (1) during a starvation period and (2) when fed nutrient deplete Rhodomonas salina after having been pre-conditioned on nutrient replete algae and vice versa. We observed that the dinoflagellate was able to maintain its N:P ratio constant over 78 h of starvation. We inferred that under starvation, nitrogen-limited O. marina mainly used fat as energy source while nitrogen-rich individuals also used proteins as fuel in cellular respiration. Further, we showed that O. marina presents resistance to nutrient limitation, with stronger regulation against P-limitation than against N-limitation. This resilience in microzooplankton stoichiometry following food quality stress would have great implications for both top-down (nutrient remineralisation) and bottom-up controls (quality as food).
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U2 - 10.1007/s00227-012-2009-3
DO - 10.1007/s00227-012-2009-3
M3 - Article
AN - SCOPUS:84866743597
SN - 0025-3162
VL - 159
SP - 2241
EP - 2248
JO - Marine Biology
JF - Marine Biology
IS - 10
ER -