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2004 Ocean Research Conference Abstract Book Co-sponsored by the American Society of Limnology and Oceanography and The Oceanography Society Abstract Book February 15-20, 2004 · Hawaii Convention Center · Honolulu, Hawaii Supported by The Acoustical Society of America, the Marine Technology Society, the Challenger Society for Marine 1 Science, and the American www.aslo.org/honolulu2004 American Society of Limnology and Oceanography Meteorological Society ASLO/TOS 2004 Ocean Research Conference 2 2004 Ocean Research Conference Abstract Book Co-sponsored by the American Society of Limnology and Oceanography and The Oceanography Society February 15-20, 2004 · Hawaii Convention Center · Honolulu, Hawaii www.aslo.org/honolulu2004 Abstract Book American Society of Limnology and Oceanography 3 ASLO/TOS 2004 Ocean Research Conference Conference Committee Gregory Cutter, Editor, L&O Bulletin Old Dominion University Conference Co-chairs Paul Kemp, Web Editor and Editor, L&O Methods Russell Moll, California Sea Grant Program, University of California at San Diego, Stony Brook University [email protected] Susana Feng, Managing Editor, L&O Methods Chuck Trees, Center for Hydro-Optics and Remote Sensing (CHORS), San Diego State University, [email protected] edu Adrienne Froelich, Director of Public Policy Planning and Steering Committee Members Helen Schneider Lemay, Business Manager Bob Chant, Rutgers University, [email protected] sg Meeting & Marketing Services Sharon Franks, University of California San Diego, [email protected] TOS Officers George Jackson, Texas A&M University, [email protected] Eric O. Hartwig, President Naval Research Laboratory Dave Karl, University of Hawaii, [email protected] H. Lawrence Clark, President-Elect Gail Kineke, Boston College, [email protected] National Science Foundation Cindy Lee, State University of New York Stony Brook, [email protected] James Yoder, Past-President Mike Laurs, Pacific Fisheries Environmental Laboratory, NOAA, National Science Foundation [email protected] Melbourne G. Briscoe, Secretary Mark Luther, University of South Florida, [email protected] Office of Naval Research Chuck Nittrouer, University of Washington, [email protected] Susan Banahan, Treasurer Steve Ramberg, [email protected] NOAA Bess Ward, Princeton University, [email protected] TOS Councillors Wilf Gardner, Geology and Geophysics Jenny Ramarui, Executive Director, The Oceanography Society, [email protected] Texas A&M University Helen Schneider Lemay, Business Manager, ASLO Business Office, Dave Karl, At-Large [email protected] University of Hawaii ASLO Board Members Ellen Druffel, Chemistry Peter A. Jumars, President University of California, Irvine University of Maine Van Holliday, Applied Technology M. Robin Anderson, Secretary BAE Systems Fisheries and Oceans Canada Lynne Talley, Physics Lynda Shapiro, Treasurer Scripps Institution of Oceanography Oregon Institute of Marine Biology Curtiss O. Davis, Biology Jonathan Cole, President-Elect Naval Research Laboratory Institute of Ecosystem Studies Ellen S. Kappel, Editor of Oceanography William Lewis, Past-President Geosciences Professional Services, Inc. Center for Limnology, University of Colorado Jenny Ramarui, Executive Director Deborah Bronk, Member-at-Large College of William and Mary/VIMS Future ASLO Meetings ASLO 2004 Summer Meeting Robert Sterner, Member-at-Large June 13-18, 2004 University of Minnesota Savannah, Georgia Daniel Conley, Member-at-Large ASLO 2005 Aquatic Sciences Meeting National Environmental Research Institute, Denmark February 20-25, 2005 Carol Folt, Member-at-Large Salt Lake City, Utah Dartmouth College ASLO 2005 Summer Meeting Morten Sondergaard, Member-at-Large June 19-25, 2005 University of Copenhagen Santiago de Compostela, Spain Curtis Suttle, Member-at-Large Presentation Archive University of British Columbia Abstracts of papers presented during the ASLO/TOS 2004 Ocean Research Peter Williams, Member-at-Large Conference will be published in an abstract book as well as archived on the School of Ocean Sciences, United Kingdom ASLO web site following the meeting. Letise Houser, Student Representative University of Delaware For More Information Colin Stedmon, Student Representative For more information on the ASLO/TOS 2004 Ocean Research Conference, National Environmental Research Institute please contact the Registration Coordinator and Conference Manager: Helen Schneider Lemay ASLO Staff Members ASLO Business Office Everett Fee, Editor-in-Chief 5400 Bosque Boulevard, Suite 680 Limnology & Oceanography Waco, Texas 76710-4446 Phone: 800-929-ASLO or 254-399-9635, Fax: 254-776-3767 Lucille Doucette, Journals Manager E-mail: [email protected] Limnology & Oceanography 4 2004 Ocean Research Conference Abstract Book Aagaard, K., University of Washington, Seattle, USA, [email protected]; Adamik, P., Palack University, Olomouc, Czech Republic, [email protected]; Woodgate, R., University of Washington, Seattle, USA, [email protected]; Gallager, S. M., Woods Hole Oceanographic Institution, Woods Hole, USA, Weingartner, T., University of Alaska, Fairbanks, USA, [email protected] [email protected]; Horgan, E. F., Woods Hole Oceanographic Institution, Woods Hole, USA, ehorgan@whoi; THE PACIFIC INFLOW THROUGH BERING STRAIT: 1990-2002 Madin, L. P., Woods Hole Oceanographic Institution, Woods Hole, USA, [email protected]; Nearly continuous measurements of the northward flow of Pacific waters through Bering Strait Govindarajan, A., Woods Hole Oceanographic Institution, Woods Hole, USA, from 1990 onward provide a remarkable record of the variable upstream forcing of the western [email protected]; arctic shelves and of the Arctic Ocean halocline. Extreme warmth in the mid-1990s, Alatalo, P., Woods Hole Oceanographic Institution, Woods Hole, USA, [email protected] accompanied by major changes in the shelf ecosystem; large and complex salinity variations THE EFFECT OF TURBULENCE ON THE FEEDING RATE OF A PELAGIC PREDATOR: THE that within a few months will be transmitted into the Arctic Ocean halocline; and a pronounced PLANKTONIC HYDROID CLYTIA GRACILIS annual cycle in the northward flow are all hallmarks of the record from Bering Strait. These and additional measurements in the Chukchi Sea suggest that the regional salinity distribution and Relatively little is known about the role of turbulence in a predator - prey system in which the circulation in the Bering Sea are determining factors in the variability of the northern shelf and predator is a passive pelagic forager. Such a predator is represented by the unusual of the injection of Pacific water into the Arctic Ocean. Campanulariid hydroid Clytia gracilis (Cnidaria, Hydrozoa), which occurs as planktonic colonies on Georges Bank, Massachusetts, USA. In this study we investigated the role of various turbulence conditions on the feeding rate of C. gracilis colonies in laboratory experiments. We Achilles, K. M., University of Delaware-College of Marine Studies, Lewes, USA, found a positive relationship between turbulence velocities and feeding rates whereby feeding [email protected]; rates tended to increase up to the turbulent energy dissipation rates of ca 1 cm2s-3. Beyond Hutchins, D. A., University of Delaware-College of Marine Studies, Lewes, USA, this threshold the feeding rates dropped slightly, indicating a dome-shaped relationship. [email protected]; Additionally, a negative relationship was found between feeding efficiency and hydroid colony Church, T. M., University of Delaware-College of Marine Studies, Lewes, USA, size under lower flow velocities, but this trend was not significant under higher turbulence [email protected] regimes. BIOAVAILABILITY OF IRON FOR CYANOBACTERIA CULTURES The chemical form of chelated Fe appears to play an important role in regulating the Adly, C. L., McGill University, Montreal, Canada, [email protected]; bioavailability of Fe to Trichodesmium colonies in the north Atlantic Ocean. Determining the Armstrong, E., University of Dundee, Dundee, United Kingdom, [email protected]; bioavailability of Fe from model ligands to Trichodesmium cultures in the lab is also important, Peers, G. S., McGill University, Montreal, Canada, [email protected]; as cultures lack the bacterial diversity associated with colonies in nature. This allows for the Tremblay, J. E., McGill University, Montreal, Canada, [email protected]; comparison of the effects of ligand structure on Fe acquisition between lab cultures and Price, N. M., McGill University, Montreal, Canada, [email protected] Trichodesmium colonies in the field, and thus differentiates between Fe uptake capabilities of IRON LIMITATION OF HETEROTROPHIC BACTERIA IN THE SUBARCTIC PACIFIC OCEAN the cyanobacterium in isolation, and uptake mediated or modified by associated bacteria within the colony. Therefore, uptake experiments using 55Fe chelated to a variety of model We monitored the response of heterotrophic bacteria to a mesoscale iron enrichment ligands were conducted on Trichodesmium cultures. These results will be compared not only experiment in the subarctic Pacific, a high-nutrient, low-chlorophyll (HNLC) region. One day to the field experiments conducted on Trichodesmium colonies, but also to other cultures of after iron addition, bacterial abundance increased 1.6-fold. Within 2 days, 3-H-leucine ecologically significant cyanobacteria such as Synechococcus. incorporation rates and growth rates increased approximately 2-fold, siderophore receptors were