JPR Advance Access published online on November 25, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi102
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1 Institute of Marine Science, University of Alaska, Fairbanks, AK 99775-7220
* To whom correspondence should be addressed. In situ growth and development of Neocalanus flemingeri/plumchrus stage 1-4 copepodites were estimated by both the artificial-cohort and the single-stage incubation methods in March, April and May of 2001-2005 at 5-6 °C. Results from these two methods were comparable and consistent. In the field, C1 to C4 stage durations ranged from 7 to more than 100 days, dependent on temperature and chlorophyll a concentration. Average stage durations were 12.4-14.1 days, yielding an average of 56 days to reach C5, but under optimal conditions stage durations were closer to 10 days, shortening the time to reach C5 (from C1) to 46 days. Generally, growth rates decreased with increasing stage ranging from 0.28 d-1 to close to zero, but were typically between 0.20 and 0.05 d-1, averaging 0.110±0.006 d-1 (mean±SE) for single-stage and 0.107±0.005 d-1 (mean±SE) for artificial-cohort methods. Growth was well described by equations of Michaelis-Menten form, with maximum growth rates (Gmax) of 0.17-0.18 d-1, and half saturation chlorophyll a concentrations (Kchl) of 0.45-0.46 mg m-3 for combined C1-C3, while Gmax dropped to 0.08-0.09 d-1, but Kchl remained at 0.38-0.93 mg m-3 for C4. In situ growth of N.flemingeri/plumchrus in this study was frequently food-limited to some degree, particularly during March. A comparison with global models of copepod growth rates suggests that these models still require considerable refinement. We suggest that the artificial-cohort method is the most practical approach to generating the multi-species data required to address these deficiencies. Communicating Editor: RP Harris
Received June 16, 2005
Accepted November 14, 2005
Article
Growth and development of Neocalanus flemingeri/plumchrus in the northern Gulf of Alaska: validation of the artificial cohort method in cold waters
Hui Liu 1
and
Russell R. Hopcroft 1 *
Russell R. Hopcroft, E-mail: hopcroft{at}ims.uaf.edu
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