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ICES Journal of Marine Science: Journal du Conseil Advance Access published online on August 18, 2009
ICES Journal of Marine Science: Journal du Conseil, doi:10.1093/icesjms/fsp216
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Coherent trends in contiguous survey time-series of major ecological and commercial fish species in the Gulf of Maine ecosystem

Janet A. Nye1, Alida Bundy2, Nancy Shackell2, Kevin D. Friedland3 and Jason S. Link1

1 National Marine Fisheries Service, Northeast Fisheries Science Center, Woods Hole Laboratory, 166 Water Street, Woods Hole, MA 02543, USA
2 Department of Fisheries and Oceans, Bedford Institute of Oceanography, PO Box 1006, Dartmouth, NS, Canada B2Y 4A2
3 National Marine Fisheries Service, Northeast Fisheries Science Center, Narragansett Laboratory, 28 Tarzwell Drive, Narragansett, RI 02882, USA

Correspondence to J. A. Nye: tel:+1 508 495 2325; fax: +1 508 495 2258; e-mail: janet.nye{at}noaa.gov

Nye, J. A., Bundy, A., Shackell, N., Friedland, K. D., and Link, J. S. 2010. Coherent trends in contiguous survey time-series of major ecological and commercial fish species in the Gulf of Maine ecosystem. – ICES Journal of Marine Science, 67: 000–000.

Fish are often delineated into distinct population or stock units that reflect human institutional borders more than ecological factors. In the Northwest Atlantic, there are many species in the broader Gulf of Maine area (GOMA), yet the area is surveyed and managed for the most part in the south by the United States and in the north by Canada. Biomass time-series of 19 representative fish species and total biomass from 7 different surveys conducted by the United States and Canada in the GOMA are compared. All species showed coherent trends in relative biomass across at least two survey time-series, and in many species a single trend could describe all time-series trends accurately. For instance, Canadian and the US time-series of Atlantic cod, Atlantic herring, haddock, thorny skate, and goosefish had comparable trends. Conversely, species such as longhorn sculpin and spiny dogfish showed differing survey time-series trends and asynchronous event timing, suggesting that their population dynamics differ spatially. Collectively, the results demonstrate the value of comparing time-series for common species from contiguous ecosystems and elucidate the relative importance of environmental and fishing factors on each species.

Keywords: Atlantic Multidecadal Oscillation, Bay of Fundy, coherence, dynamic factor analysis, Georges Bank, Gulf of Maine, minimum/maximum autocorrelation analysis, Scotian Shelf, Synchrony, time-series analysis

Received 8 December 2008; accepted 2 July 2009.


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