Currie, W. JS. University of Guelph, wcurrie@uoguelph.ca
Roff, J. JS. University of Guelph, jroff@uoguelph.ca

 
THE TURBULENT LIFE OF PLANKTON: DO THEY REALLY GO WITH THE FLOW?
 
It is not clear at which scales turbulence ceases to become the primary influence on aquatic biological distributions. While it is known that turbulent effects become insignificant below the Kolmogorov scale, at much greater scales, biological patterns can be unaffected by turbulence due to processes such as locomotion. Power spectral analysis has allowed us to determine the scales of coherency between purely physical measurements (i.e. temperature) that are passive scalers (and thus follow the turbulent cascade) and biological measurements (i.e. biomass) that appear passive at only relatively large spatial/temporal scales. Concurrently collected data from CTD, Optical Plankton Counter and ADCP in the Gulf of St. Lawrence indicated that coherency between measures of phytoplankton, zooplankton and CTD may be scale dependant. This implies that our estimates of ecological interactions may also be scale dependant. If true, then small scale phenomena, such as encounter rates, will have much greater variance than if plankton distributions were driven solely by turbulence.
 
Day: Tuesday, Feb. 2
Time: 03:45 - 04:00pm
Location: Hilton of Santa Fe
 
Code: SS01TU0345H