Vertical copepod aggregations and interactions with chlorophyll and production on the Peru shelf |
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| Authors: | Alex W Herman |
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| Institution: | 1. Department of Fisheries and Oceans, Atlantic Oceanographic Laboratory, Bedford Institute of Oceanography, Dartmouth, Nova Scotia,CanadaB2Y 4A2 |
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| Abstract: | Data consisting of high resolution profiles of in situ chlorophyll fluorescence and copepods have been measured with a towed Batfish on the Peru shelf during November 1977. The day to day vertical variability of chlorophyll fluorescence was highly complex; however, there were indications of common features consisting of a surface chlorophyll layer about 10 to 15 m thick and a subsurface chlorophyll maximum at about 25-m depth. Of the dominant copepods measured, Eucalanus inermis, Calanus chilensis, and Centropages brachiatus, the latter two were aggregated in layers at about 15 to 20 m directly within a depression located between the surface and subsurface chlorophyll layer. Primary production profiles estimated from light and chlorophyll data indicated that carbon production was generally restricted to the surface layer (≈15m). Estimates of integrated carbon production (m?2) within the surface layer ranged from 1.3 to 1.5 g C m?2 d?3. Copepod grazing estimates indicated that only 10% of daily carbon production was utilized. |
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