SS2.06 Microbial Diversity in Time and Space
Date: Tuesday, June 11, 2002
Time: 3:00:00 PM
Location: Lecture Theatre
 
LovejoyC, Université Laval, Québec, Canada, Connie.lovejoy@giroq.ulaval.ca
Carmack , E, C, Institute of Ocean Sciences, Sydney, CANADA, CarmackE@pac.dfo-mpo.gc.ca
Legendre, L, , Laboratoire d'Oceanographie de Villefranche, Villefranche-sur-Mer Cedex, FRANCE, legendre@obs-vlfr.fr
Price, N, , McGill , Montréal , CANADA, NPRICE@BIO1.lan.mcgill.ca
 
Protist biodiversity and watercolumn interleaving
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During a spring-summer bloom in a large Arctic polynya, vertically distinct protist (phytoplankton and protozoa) communities occurred within layers caused by interleaving and entrainment of different water masses. We developed a ternary community distance index to quantify the variability in protist community structure in these heterogeneous surface layers. This index was highly correlated (r=0.984, n=6) with the extent of physical interleaving (quantified as the RMS deviations in temperature between measured and smoothed profiles) indicating a high degree of physical biotic coupling within water columns of the polynya. Water mass layering created favorable conditions for ciliate blooms that were associated with distinct temperature-salinity layers. Water mass interleaving is likely to contribute to microbial biodiversity, community structure and vertical segmentation of biogeochemical processes in the upper ocean.