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ORIGINAL PAPER Evolutionary shifts in copepod acid tolerance

Evolutionary shifts in copepod acid tolerance
in an acid-recovering lake indicated by resurrected
resting eggs
Alison M. Derry Shelley E. Arnott Peter T. Boag
Received: 1 July 2008 / Accepted: 16 January 2009 / Published online: 30 January 2009
Springer Science+Business Media B.V. 2009
Abstract We employed zooplankton resting eggs to track population-level shifts in acid
tolerance over the last century in a boreal shield lake recovering from acidification. Shifts
in mean and variance of ecological tolerances of species that occupy ecosystems recov-
ering from anthropogenic stress are important to consider because of their potential to
influence eco-evolutionary dynamics at community and ecosystem levels. In a laboratory
experiment, we compared juvenile survival of Leptodiaptomus minutus copepods hatched
from resting eggs from three time periods (80- to 100-year- old: pre-industrial, 20- to 50-
year- old: lake acidification, and 8- to 10-year- old: recovery of lake-water back to
pH C 6.0) under several pH treatments. Mitochondrial DNA was used to confirm species
identity and to test for population bottlenecks as a possible mechanism to explain our
results. We expected that nauplii hatched from eggs deposited prior to industrialization
(lake-water pH & 6.0) and from the period of pH recovery (lake-water pH C 6.0) would
have lower mean and more variable survival at acidic pH compared to nauplii hatched


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


Collections: Environmental Sciences and Ecology; Biology and Medicine