SS1.09 Fisheries Population Linkage Spatial and Temporal Variation in Zooplankton
Date: Wednesday, June 12, 2002
Location: Poster Session - VCC
PepinP, Fisheries and Oceans, St. John's, Canada,
Dower, J, F, University of Victoria, Victoria, Canada,
Linking larval growth with prey availability in the field: the need to think about the probabilistic nature of our observations
Despite laboratory evidence that growth of larval fish is strongly affected by variations in prey abundance, there is limited field evidence which concurs with those observations. This discrepancy may be due partly to the mismatch in the scales at which manipulative and observational studies are conducted. However, our fundamental approach to describing the environmental variability faced by larvae as well as the larva's pontential to respond to it may also contribute to difficulties in matching lab-derived predictions with field data. Information from field studies dealing with the growth of radiated shanny will be used to illustrate some limitations of past approaches used to study the dynamics of larval fish. Patterns in growth histories show how differences among individuals may lead to varying responses to fluctuations in prey availability. Furthermore, the potential variations in the drift history of individual larvae and our ability to describe the variations in environmental conditions may place constraints on our ability to identify the relationship between larval growth and their feeding environment.