Effect of advection on variations in zooplankton at a single location near Cabo Nazca, Peru [electronic resource]
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| Online Access: |
Online Access |
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| Corporate Authors: | , |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C : Oak Ridge, Tenn. :
United States. Dept. of Energy ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
1980.
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| Subjects: |
| Abstract: | Temporal variations in the biomass and species composition of zooplankton at a single midshelf station in an upwelling area off Peru can be explained to a large extent by onshore-offshore advection in the upper 20 m of the water column. During periods of strong or sustained near-surface onshore flow, peaks in biomass of zooplankton were observed at midshelf and typically oceanic species of copepod were collected. In periods of offshore flow at the surface, a copepod capable of migrating into oxygen-depleted layers deeper than 30 m was collected. A simple translocation model of advection applied to the cross-shelf distribution of Paracalanus parvus suggests that the fluctuations in P. pavus observed in the midshelf time-series were closely related to onshore-offshore flow in the upper 20 m. Fluctuations in abundance of the numerically dominant copepod, Acartia tonsa, were apparently affected by near surface flow also. The population age-structure suggests that A. tonsa was growing at maximal rates, due in part to its positive feeding response to the dinoflagellate/diatom assemblage of phytoplankton. |
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| Item Description: | Published through SciTech Connect. 04/01/1980. "bnl-27885" " conf-800237-3" International symposium on coastal upwelling, Los Angeles, CA, USA, 4 Feb 1980. Huyer, A; Smith, S L; Brink, K H; Santander, H; Cowles, T J. Woods Hole Oceanographic Institution, MA (USA) |
| Physical Description: | Pages: 36 : digital, PDF file. |