Rines, J. E. Graduate School of Oceanography, URI, jrines@gsosun1.gso.uri.edu
Sullivan, J. E. Graduate School of Oceanography, URI, jsully@gsosun1.gso.uri.edu
Donaghay, P. L. Graduate School of Oceanography, URI, donaghay@gsosun1.gso.uri.edu
McFarland, M. N. Graduate School of Oceanography, URI, malcolm@gsosun1.gso.uri.edu

 
OBSERVATIONS ON THE EFFECTS OF WIND-FORCED TURBULENCE ON THE STRUCTURAL INTEGRITY OF CHAIN-FORMING DIATOMS
 
Field observations in East Sound, Washington (May 1995) suggested that small scale turbulence resulting from wind-forcing may create enough shear in the water column to fragment large, colonial diatoms. Laboratory studies on Chaetoceros vanheurckii Gran, a taxon which appeared especially susceptible to damage, supported our initial field observations. A second field study was conducted in East Sound on August 4-5, 1998. Surface water samples were examined from 10 stations around the Sound on 4 August, when winds were from the south at about 2 m/sec. The diatom flora of the eight stations inside the Sound was uniform, and was dominated by unbroken Chaetoceros. On 5 August the wind speed abruptly increased to 6-7 m/sec, with gusts to 9 m/sec. The observed flora had the same taxonomic composition, but many colonies were fragmented. The implications of our observations to marine optics and phytoplankton species composition and succession will be discussed.
 
Day: Tuesday, Feb. 2
Time: Poster
Location: Sweeney Center
 
Code: SS05TU0828S