Ma, H. Rutgers, The State University of New Jersey, hgma@eden.rutgers.edu
Grassle, J. Rutgers, The State University of New Jersey, jgrassle@imcs.rutgers.edu
Butman, C. Woods Hole Oceanographic Institution, cbutman@whoi.edu

 
MESOSCALE SPATIAL DISTRIBUTION OF SURFCLAM LARVAE AT LEO-15 ON THE NEW JERSEY CONTINENTAL SHELF*
 
During summer upwelling and relaxation events in 1996-1998, we examined near-bottom meroplankton abundance at three stations, two inshore stations on the landward and seaward side of Beach Haven Ridge, and one about 8 km offshore. Samples were taken every 4 h using Moored Automated Serial Zooplankton Pumps (MASZP). Relatively brief pulses of high bivalve larval abundances (maximum = 3,300 ind. per 250 l), which were generally dominated by surfclam larvae, coincided with the relaxation of upwelling and the downwelling of warm, offshore surface water. Surfclam larvae only appeared at the offshore station when warm downwelling water reached the bottom there. On other occasions relatively high abundances of larval bivalves characteristic of estuarine species were probably associated with the warm low salinity Hudson River Current. During upwellng and relaxation events in the summer of 1998, in addition to MASZP sampling, we sampled adaptively with respect to nearshore patterns of convergence and divergence, using a Mobile Zooplankton Pump, and examined bivalve larvae species abundances and their distribution with depth. This study is part of an investigation of factors affecting larval supply, settlement, and recruitment of surfclams and their invertebrate predators. *Supported by NOAA/NURP grant NYB-97-5, NOAA Sea Grant, and IMCS
 
Day: Friday, Feb. 5
Time: 11:45 - 12:00pm
Location: Hilton of Santa Fe
 
Code: SS12FR1145H