Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/49888
Title: Assessment of Calanus finmarchicus growth and dormancy using the aminoacyl-tRNA synthetases method
Authors: Yebra, L.
Hirst, A. G.
Hernández-León, S. 
UNESCO Clasification: 251001 Oceanografía biológica
Keywords: Copepods
North Atlantic
Issue Date: 2006
Publisher: 0142-7873
Journal: Journal of Plankton Research 
Abstract: We obtained growth rates of the copepod Calanus finmarchicus at different locations across the North Atlantic between May 1998 and June 2004. Animals were incubated for 2–9 days and fed either with natural food assemblages or with cultured algae. During this period, we measured both somatic weight-specific growth rates (measured as protein change) and aminoacyl-tRNA synthetases (AARS) activity. We found a highly significant relationship between AARS activity and growth in protein content (R2 = 0.55, P < 0.001). Significant AARS activity also occurred when growth was negative, the relationship predicting an AARS activity level of ≤8.33 nmPPi·mg protein−1·h−1 when somatic growth is zero. This is because AARS activity is expected even when growth is negative, owing to the continued protein turnover in the cells. The AARS method allowed for the first time the study of protein metabolism in overwintering C. finmarchicus. Our study results showed that overwintering copepods had significantly lower values of AARS activity than non-diapausing animals (t = −3.51, P < 0.002). The AARS method opens the possibility to better understand physiology dynamics of deep-water organisms (e.g. the beginning and end of diapause).
URI: http://hdl.handle.net/10553/49888
ISSN: 0142-7873
DOI: 10.1093/plankt/fbl049
Source: Journal of Plankton Research [ISSN 0142-7873], v. 28, p. 1191-1198
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