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Ecological Applications, 12(1), 2002, pp. 138153 2002 by the Ecological Society of America
 

Summary: 138
Ecological Applications, 12(1), 2002, pp. 138153
2002 by the Ecological Society of America
THE INFLUENCE OF DROUGHT AND RE-ACIDIFICATION ON
ZOOPLANKTON EMERGENCE FROM RESTING STAGES
SHELLEY E. ARNOTT1,3
AND NORMAN D. YAN2
1Cooperative Freshwater Ecology Unit, Laurentian University, Ramsey Lake Road, Sudbury, Ontario, Canada P3E 2C6
2Biology Department, York University, 4700 Keele Street, Toronto, Ontario, Canada M3J 1P3
Abstract. The recovery of biota in lakes damaged by cultural acidification may be
influenced by a number of factors, including El Nino-related droughts. Long-term zoo-
plankton records from Swan Lake, Sudbury, Canada, indicated that crustacean species
richness temporarily increased from an annual mean of 10 species to 18 species in the year
following a two-year drought and subsequent re-acidification of the lake. We hypothesized
that this unexpected increase in richness was the result of an emergence of zooplankton
from resting stages that were historically deposited in the lake sediments. The drought and
re-acidification event resulted in several changes in the lake that may have triggered the
emergence of zooplankton, including desiccation of littoral sediments (and the zooplankton
resting stages residing there), increased water clarity, increased profundal temperature, and
increased oxygen concentration in the bottom waters. Using in situ emergence traps, we

  

Source: Arnott, Shelley - Department of Biology, Queen's University (Kingston)

 

Collections: Environmental Sciences and Ecology; Biology and Medicine