Aquatic Sciences Meeting, Albuquerque 2001

CS37 Zooplankton

Date: Tuesday, February 13, 2001, Time: 10:15:00 AM

Location: Aztec

Durbin, E, , University of Rhode Island, Narragansett, USA, edurbin@gso.uri.edu

Casas, M, , University of Rhode Island, Narragansett, USA, mcasas@gso.uri.edu

Campbell, R, , University of Rhode Island, Narragansett, USA, rcampbell@gso.uri.edu

Wagner, M, , University of Rhode Island, Narragansett, USA, mwagner@gso.uri.edu

Runge, J, , Dept Fisheries and Oceans, Canada, Mt Joli, Canada, jrunge@hotmail.com

Niehoff, B, , Alfred Wegner Instute for Polar Research, Bremerhaven, Germany, bniehoff@awi-bremerhaven.de

CALANUS FINMARCHICUS ABUNDANCE, EGG PRODUCTION AND GROWTH RATES IN THE GULF OF MAINE DURING WINTER.

Abundance and stage distribution, egg production rates, and RNA:DNA ratios of Calanus were measured along a transect from the northern Gulf of Maine to Georges Bank during February, of 1999 and 2000. During both years the spring bloom had begun on GB. During 1999 the spring bloom had begun in the central GOM (>2 µg/l chlorophyll a) but not in the Maine Coastal Current (chl a <0.5 µg/l). Most of the resting population of Calanus had molted to the adult stage and were actively reproducing. There was a good relation between egg laying rates and RNA:DNA ratios, and chl a. A small cohort of young nauplii was present at all stations in the Gulf. In contrast, during 2000 the spring bloom had not yet begun in the GOM (chl a <0.5 µg/l). Calanus was reproducing but based on the stage of gonad maturity were food-limited at all stations. Nauplii were present but few had advanced beyond the first feeding stage (N3). On Georges Bank during both years the abundance was much greater and the cohort more advanced.

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Aquatic Sciences Meeting, Albuquerque 2001

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