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JPR Advance Access originally published online on February 6, 2004
Journal of Plankton Research 2004 26(3):351-356; doi:10.1093/plankt/fbh028
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Journal of Plankton Research Vol. 26 No. 3 © Oxford University Press 2004; all rights reserved

Aminoacyl-tRNA synthetases activity as a growth index in zooplankton

Lidia Yebra1,* and Santiago Hernández-León

Biological Oceanography Laboratory, Facultad De Ciencias Del Mar, Universidad De Las Palmas De Gran Canaria, Campus Universitario De Tafira, 35017, Las Palmas De Gran Canaria, Canary Islands, Spain 1 Present Address: Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth PL1 3DH, UK

* Corresponding Author: lymo{at}mail.pml.ac.uk

A simple method for the assay of aminoacyl-tRNA synthetases (AARS) activity was modified for application in planktonic crustaceans as an index of somatic growth. The cladoceran Daphnia magna was cultured in the laboratory and its AARS activity measured without substrate addition. The relationship between the enzyme activities of animals of similar age and individual biomass growing at different rates was tested. A significant relationship was found between AARS activity and somatic growth in terms of both protein and dry weight.


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