2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/20/2019 | 11:45 AM - 12:00 PM | USING BIOENERGETICS AND POPULATION DYNAMICS MODELLING TO INFORM FISHERIES MANAGEMENT AT JOE’S VALLEY RESERVOIR, UTAH. | 253 AB
USING BIOENERGETICS AND POPULATION DYNAMICS MODELLING TO INFORM FISHERIES MANAGEMENT AT JOE’S VALLEY RESERVOIR, UTAH.
Since 1999, over-abundance of the introduced non-game fish Utah chub (Gila atraria) in Joe’s Valley Reservoir has prompted concern over inter-specific competition with salmonid game species. Sterile hybrid top predators, splake (Salvelinus namaycush X Salvelinus fontinalis) and tiger muskellunge (Esox masquinongy X Esox lucius) were stocked in the lake to apply top-down pressure for control of the Utah chub population. Our goal was to evaluate the effectiveness of this biological control via consumption by tiger muskellunge, splake and Bear Lake cutthroat trout (Oncorhynchus clarki utah) while also maintaining chub as a forage species. An age-structured bioenergetics model was constructed for each predator species to estimate annual consumption of Utah chub. Using estimated vital rates, an age-structured matrix population model was constructed for Utah chub to evaluate population viability. We found that Utah chub in the reservoir were the primary forage for tiger muskellunge and splake, consuming 81.7% of the biomass of Utah chub annually. We found the asymptotic population growth rate (?) for Utah chub to be 0.923, indicating an annual decline of 7.7% in the population. Extinction probability analysis found the mean time to population extinction was 45.75 years.
- Food Webs
- Predator-prey
- Population
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Presenters/Authors
Jack Dudding
(), Utah Division of Wildlife Resources, jdudding@utah.gov;
ASHA DISCLOSURE:
Financial -
Nonfinancial -