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Deep-sea corals record dramatic long-term shift in Pacific Ocean ecosystem
Date:12/15/2013

ls now show that the decadal-scale changes are really only small oscillations superimposed on a dramatic long-term shift at the base of the Pacific ecosystem. This long-term perspective may help us better predict the effects of global warming on open ocean regions."

The new findings also suggest a new interpretation of data from other researchers showing changes in nitrogen isotopes in the bones of seabirds. A recent study of Hawaiian petrel bones using bulk nitrogen isotope data attributed the change to shifts in the length of open ocean food chains, possibly induced by overfishing (forcing petrels to feed lower on the food chain). In fact, the compound-specific data strongly imply that isotopic changes on all trophic levels are more likely due to the long-term shift in nitrogen sources at the base of the food web, McCarthy said.

Coauthor Tom Guilderson, who is affiliated with UCSC and Lawrence Livermore National Laboratory, has been collecting deep-sea corals for more than a decade to study them for clues to past oceanographic and environmental conditions. He teamed up with McCarthy to initiate this project. In addition to McCarthy, Guilderson, and Sherwood, the coauthors of the paper include UCSC graduate students Fabian Batista and John Schiff.

Coral samples were collected by the Hawaiian Undersea Research Lab's Pisces V submersible, with funding from the National Oceanic and Atmospheric Administration (NOAA) and the National Geographic Society. The bulk of this research was funded by the National Science Foundation.


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Contact: Tim Stephens
stephens@ucsc.edu
831-459-2495
University of California - Santa Cruz
Source:Eurekalert  

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