Affiliation:
1. Department of Biological Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
2. Freshwater Institute, Fisheries and Oceans Canada, Winnipeg, MB R3T 2N6, Canada
Abstract
Abstract
Environment–phenotype interactions are the most pronounced during early life stages and can strongly influence metabolism and ultimately ecological fitness. In the present study, we examined the effect of temperature [ambient river temperature (ART) vs ART+2°C], dissolved oxygen (DO; 100% vs 80%) and substrate (presence vs absence) on standard metabolic rate, forced maximum metabolic rate and metabolic scope with Fulton’s condition factor (K), energy density (ED) and critical thermal maximum (CTmax) in age-0 Lake Sturgeon, Acipenser fulvescens, before and after a simulated overwintering event. We found that all the environmental variables strongly influenced survival, K, ED and CTmax. Fish reared in elevated temperature showed higher mortality and reduced K pre-winter at 127 days post-hatch (dph). Interestingly, we did not find any significant difference in terms of metabolic rate between treatments at both sampling points of pre- and post-winter. Long-term exposure to 80% DO reduced ED in Lake Sturgeon post-winter at 272 dph. Our data suggest that substrate should be removed at the onset of exogenous feeding to enhance the survival rate of age-0 Lake Sturgeon in the first year of life. Effects of early rearing environment during larval development on survival over winter are discussed with respect to successful recruitment of stock enhanced Lake Sturgeon, a species that is at risk throughout its natural range.
Funder
NSERC/Manitoba Hydro Industrial Research Chair
University of Manitoba Faculty of Science and Department of Biological Sciences
Publisher
Oxford University Press (OUP)
Subject
Management, Monitoring, Policy and Law,Nature and Landscape Conservation,Ecological Modelling,Physiology
Cited by
11 articles.
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