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Where have all the codfish gone?
Date:2/26/2014

The mega-decline in cod and other fisheries across the North Atlantic Ocean threatens the livelihood of fishermen and communities in New England and Atlantic Canada. One suspect in the disappearance of cod and other groundfish is the food source for their young: a planktonic copepod crustacean, no larger than a grain of rice. Recent changes in local copepod populations have co-occurred with declines in fisheries elsewhere, such as the collapse of the cod fishery in Europe's North Sea.

For this and other reasons, Petra Lenz and Andrew Christie are among the scientists at the University of Hawai'i at Manoa working to understand how copepods are responding to global climate change, including to increases in water temperature, altered ocean currents, and ocean acidification.

Because of the copepod's small size and its vast ocean habitat, it is a poor subject for conventional physiological studies. New molecular techniques have opened doors for an alternative approach. Known as transcriptomics, this technique makes a catalog of all the messages ("transcripts") produced by the cells that control the animal's physiology. With this tool, biologists are now able to listen in on the instructions being sent out to direct an organism's response to its changing environment. With respect to copepods, the challenge is to identify and understand each message, in order to track down the causes of population changes.

The first transcriptome for the key North Atlantic copepod Calanus finmarchicus has now been published and made available for scientists everywhere. Appearing in a February 2014 issue of the journal PLOS ONE, it is the work of a team of scientists from the Pacific Biosciences Research Center at UH Manoa, Ohio University and Indiana University's National Center for Genome Analysis Support. Mount Desert Island Biological Laboratory in Salisbury Cove, Maine provided access to the biological samples. The transcriptome was sequenced by the
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Contact: Andrew E. Christie
crabman@pbrc.hawaii.edu
808-956-5212
University of Hawaii at Manoa
Source:Eurekalert  

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