Abstract
Effects of food availability and season on the free amino acid (FAA) and total protein content of the copepod Calanus finmarchicus females were investigated in two mesocosm experiments on the Norwegian west coast in spring and autumn. Starved C. finmarchicus females showed no change in total FAA content, but the FAA pool composition changed drastically. During the first 10 days of starvation the protein content showed a moderate decline (<2 μg ind−1); however, during the following 21 days the total content was drastically reduced, from 63 to 9 μg ind−1. This supports the notion of a sequential catabolism of endogenous nutrients during starvation. In females at high food concentrations, the body protein content increased during spring, but decreased during autumn. The FAA pool composition of females differed between spring and autumn in 14 of the 18 FAA investigated. Reduced body protein content and increased proportion of essential free amino acid were observed during starvation. Similar changes were observed in females sampled at the end of the mesocosm experiments in the autumn. The results suggest that mature C. finmarchicus females are in a negative protein balance during autumn, despite high food concentrations, contributing to a lower fitness than in females maturing during the spring.
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Acknowledgements
We acknowledge the experimental and field assistance of Rikard Humlen and the analytical assistance of Maria Sula Evjen, Monica Martinussen and Aud Larsen. This work was a part of the MARICULT project NAPP and was supported by grants from the Research Council of Norway. These experiments comply with the current animal experimental laws of Norway, the country in which the present work was conducted.
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Communicated by L. Hagerman, Helsingør
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Helland, S., Nejstgaard, J.C., Fyhn, H.J. et al. Effects of starvation, season, and diet on the free amino acid and protein content of Calanus finmarchicus females. Marine Biology 143, 297–306 (2003). https://doi.org/10.1007/s00227-003-1092-x
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DOI: https://doi.org/10.1007/s00227-003-1092-x