Rapien, M. K. University of Rhode Island, maryr@gsosun1.gso.uri.edu
Wishner, K. K. University of Rhode Island, kwishner@gsosun1.gso.uri.edu

 
SEASONAL AND SPATIAL TRENDS OF MACROZOOPLANKTON DISTRIBUTIONS IN THE ARABIAN SEA OXYGEN MINIMUM ZONE
 
Zooplankton samples were collected as part of the U. S. JGOFS Arabian Sea program during four seasonal cruises in 1995: January (late Northeast Monsoon), March (Spring Intermonsoon), August-September (late Southwest Monsoon), and December (early Northeast Monsoon). Samples were collected from 0 - 1000 m using a double 1 m2 MOCNESS (153 micron mesh). Macrozooplankton (including decapods, euphausiids, and small mesopelagic fish) from 300 - 1000 m were identified to the lowest taxon possible at 2 stations (representing inshore and offshore habitats). Vertical distributions were compared with physical parameters (oxygen, temperature, and salinity) and between species. Seasonal and horizontal trends in distribution and abundance were also observed. Several species of fish and euphausiids were apparently diel vertical migrators, while other animals (Cyclothone spp. and Gennadas spp.) were associated day and night with increasing oxygen levels at the bottom of the oxygen minimum zone (approximately 500 - 700 m). This study is part of an effort to examine the dynamics of deep water zooplankton in order to better understand their role in the overall carbon cycling of the Arabian Sea.
 
Day: Tuesday, Feb. 2
Time: Poster
Location: Sweeney Center
 
Code: CS67TU0159S