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JOURNAL OF PLANKTON RESEARCH | VOLUME 11 | NUMBER 2 | PAGES 243-261 | 1989
© Oxford University Press

research-article

Vertical relationships between chlorophyll, production and copepods in the eastern tropical Pacific

Alex W. Herman

Physical and Chemical Sciences, Department of Fisheries and Oceans, Bedford Institute of Oceanography P.O. Box 1006, Dartmouth, N.S., Canada B2Y 4A2

Received on March 17, 1988; accepted on November 17, 1988 Data consisting of high resolution profiles of in situ chlorophyll, copepods and primary production have been measured with a towed Batfish and profiling pumping system at two sites named ‘BIOSTAT’ (9°45'N, 93°45'W) and ‘DOME’ (7°19'N, 83°25'W) sites during March 1981. Primary production profiles were generated from Batfish profiles using a chlorophyll/light model and incubated pump samples, the latter with high vertical resolution of 3–5 m. The BIOSTAT site had a subsurface chlorophyll maximum situated at {small tilde}50 m, and a production maximum at a depth of 40 m Copepods had a mean depth centroid corresponding to the production maximum although their distribution was more uniformly dispersed from 0 to 40 m. The latter observation indicated that copepods occurred at depths of high production potential and low biomass rather than high total production and high biomass as found at 40 m depth. The DOME site had a mixed surface layer of chlorophyll (0–20 m) while copepods were located at the base of the chlorophyll layer and primary production maximum located at the surface (0–10 m). The areal daily production measured at the BIOSTAT and DOME sites were 0.27 and 0.80 mg C m–2day–1 respectively.


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