Journal
JOURNAL OF GREAT LAKES RESEARCH
Volume 40, Issue 1, Pages 155-163Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jglr.2013.12.005
Keywords
Larval; Survival; Metamorphosis; Petromyzon marinus; Tag-recovery
Funding
- Great Lakes Fishery Commission Sea Lamprey Research Program
- Michigan State University (MSU) Quantitative Fisheries Center
- Council of Lake Committee Agencies
- Michigan Department of Natural Resources
- Great Lakes Fishery Commission
- MSU's College of Agriculture and Natural Resources
- MSU Extension
- MSU AgBioResearch
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Sea lamprey Petromyzon marinus control in the Great Lakes primarily involves application of lampricides to streams where larval production occurs to kill larvae prior to their metamorphosing and entering the lakes as parasites (juveniles). Because lampricides are not 100% effective, larvae that survive treatment may metamorphose before streams are again treated. Larvae that survive treatment have not been widely studied, so their dynamics are not well understood. We tagged and released larvae in six Great Lake tributaries following lampricide treatment and estimated vital demographic rates using multistate tag-recovery models. Model-averaged larval survivals ranged from 56.8 to 57.6%. Model-averaged adult recovery rates, which were the product of juvenile survivals and adult capture probabilities, ranged from 6.8 to 9.3%. Using stochastic simulations, we estimated production of juvenile sea lampreys from a hypothetical population of treatment survivors under different growth conditions based on parameter estimates from this research. For fast-growing populations, juvenile production peaked 2 years after treatment. For slow-growing populations, juvenile production was approximately one-third that of fast-growing populations, with production not peaking until 4 years after treatment. Our results suggest that dynamics (i.e., survival, metamorphosis) of residual larval populations are very similar to those of untreated larval populations. Consequently, residual populations do not necessarily warrant special consideration for the purpose of sea lamprey control and can be ranked for treatment along with other populations. Consecutive lampricide treatments, which are under evaluation by the sea lamprey control program, would be most effective for reducing juvenile production in large, fast-growing populations. Published by Elsevier B.V. on behalf of International Association for Great Lakes Research.
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