Accession Number:

ADA318650

Title:

Zooplankton Around Four Eastern North Pacific Seamounts.

Descriptive Note:

Final rept. 1 Oct 88-30 Sep 96,

Corporate Author:

SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA

Personal Author(s):

Report Date:

1996-12-01

Pagination or Media Count:

3.0

Abstract:

The influence of large seamounts on ambient oceanic biological, physical, chemical and geological environment was the focus of the Flow Over Abrupt Topography TOPO ARI. The research reported here comprised the water column zooplankton ecology component of the ARI. Our field program 1989 to 1991, centered on Fieberling Guyot 32 deg 25N, 127 deg 47W, with three other seamounts investigated Dowd Guyot 13 deg 27N, 119 deg 53 W, Northeast Bank 32 deg 20N, 119 deg 37W and Sixtymile Bank 32 deg 05N, 118 deg 15W. Support for the studies at the latter two seamounts came from the United States-Israel Binational Science Foundation. The zooplankton studies tested three hypotheses 1 mesoscale patches gaps of reduced numbers of migrating zooplankton occur over seamounts 2 these gaps increase the patchiness of migrating species in the surrounding waters. 3 increased numbers of empty and partly empty exoskeletons carcasses of crustacean zooplankton occur throughout the water column over submarine elevations shallower than about 500 m. Hypothesis 1 was supported by the data for most zooplankton, not just migrators Genin et al, 1994. Hypothesis 2 has not been falsified by our analyses to date, but the sampling appears to have been insufficient to verify it.

Subject Categories:

  • Biology
  • Physical and Dynamic Oceanography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE