Patoine, A. Université de Montréal, patoinea@ere.umontreal.ca
Pinel-Alloul, B. Université de Montréal, pinelb@ere.umontreal.ca
Prepas, E. E.. University of Alberta,

 
ZOOPLANKTON ABUNDANCE AND SPECIES RICHNESS IN UNPERTURBED - AND DEFORESTED-WATERSHED LAKES OF THE NORTHEASTERN CANADIAN BOREAL FOREST
 
Deforestation by logging and natural forest fires annually remove about 2% of the merchantable forest area in Canada The effects of watershed deforestation on zooplankton community structure are unknown. Zooplankton density, biomass and richness was quantified during the year 1996 in 38 lakes distributed among three groups: 20 lakes with unperturbed watersheds, nine with logged watersheds and nine with burned watersheds. All logging and natural forest fires occurred in 1995. Mean annual densities of cyclopoids and rotifers were significantly greater in burned-watershed lakes than in unperturbed-watershed lakes. Calanoid and cladoceran density showed no significant variation among watershed groups. Total zooplankton richness (number of species per lake) varied between 33 and 64; most of it was accounted for by rotifers (18 to 45). Richness of rotifers and cyclopoids tended to be higher in burned watershed lakes than in unperturbed-watershed lakes, with logged-watershed lakes showing intermediate values of richness. Calanoid richness of logged-watershed lakes was lower than unperturbed or burned-watershed lakes. Analyses are underway to examine the relationships between zooplankton density, biomass and richness and environmental variables (lake morphometry, nutrient concentration and specific fish densities).
 
Day: Wednesday, Feb. 3
Time: 08:45 - 09:00am
Location: Sweeney Center
 
Code: CS59WE0845S