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JPR Advance Access originally published online on September 21, 2006
Journal of Plankton Research 2006 28(12):1191-1198; doi:10.1093/plankt/fbl049
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Assessment of Calanus finmarchicus growth and dormancy using the aminoacyl-tRNA synthetases method

L. Yebra1,2,*,{dagger}, A. G. Hirst2 and S. Hernández-León3

1 Plymouth Marine Laboratory, Prospect Place, Plymouth, PL1 3DH, UK 2 British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK and 3 Biological Oceanography Laboratory, Facultad de Ciencias del Mar, Universidad de Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, 35017, Spain {dagger} Present Address: Institut de Ciències del Mar (CSIC), Passeig Marítim de la Barceloneta, 37-49, Barcelona, 08003, Spain

* Corresponding Author: lyebra{at}icm.csic.es

Received on June 23, 2006; revised on August 4, 2006; accepted on September 18, 2006

Communicating editor: R.P. Harris


  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).


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