Aquatic Sciences Meeting, Albuquerque 2001

PC07 Spatial and Temporal Connections

Date: Wednesday, February 14, 2001

Location: Southwest Hall

Johnson, C, L, Scripps Institution of Oceanography, La Jolla, USA, clj@ucsd.edu

Gendron, J, M, Scripps Institution of Oceanography, La Jolla, USA, gendron@pop.salk.edu

VERTICAL DISTRIBUTION OF DORMANT CALANUS PACIFICUS IN BASINS AND DEEP WATER OFF SOUTHERN CALIFORNIA

Dormant Calanus pacificus have been found in an extremely dense aggregation in Santa Barbara Basin (SBB) and in less dense, mid-depth layers off San Diego and Baja California. In October 1999 we examined the vertical distribution of Calanus at SBB, four other basin stations, and five deep, non-basin stations to determine whether dense aggregations of dormant Calanus occurred in basins other than SBB and whether dormant Calanus were more abundant at basin stations than non-basin stations. Calanus CV abundance, integrated over the depth range where they were dormant, was not significantly different at basin stations and non-basin stations. In contrast with SBB where a single depth stratum contained 75% of dormant CVs, dormant CVs at other stations had a fairly even distribution over a broad depth range. This suggests that the dense aggregation observed in SBB is formed when descent of local CVs is arrested by the bottom. Formation of dense basin aggregations of dormant Calanus does not appear to be a widespread phenomenon in the Southern California Bight but is limited to SBB, the shallowest basin in the region.

This Session Listing

Aquatic Sciences Meeting, Albuquerque 2001

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