Climate warming and projected loss of thermal habitat volume in lake populations of brook trout DOI Creative Commons
Mark S. Ridgway, D. Smith,

Allan H. Bell

et al.

Canadian Journal of Fisheries and Aquatic Sciences, Journal Year: 2024, Volume and Issue: 81(5), P. 632 - 645

Published: Feb. 16, 2024

We applied an ensemble of climate warming models to iconic protected landscape (Algonquin Park, Ontario) and the seasonal temperature profile model for lakes assess changes in brook trout ( Salvelinus fontinalis) thermal habitat volume (THV) among different sizes 30-year periods under two scenarios (RCP 4.5 8.5). Bayesian beta regression show that lake size (surface area) morphometry (dynamic ratio) are important factors THV loss. loss increases as a function dynamic ratio (transition from bowl-shaped dish-shaped lakes). The magnitude this effect depends on category RCP scenario. Small (<100 ha) medium (100–500 projected have greater 2071–2100 (60%–100% 8.5; 40%–70% 4.5) than large (>500 similar shape. Climate projections balance century, regardless category, will result range widely morphometry.

Language: Английский

Visual sensitivity, foraging behavior, and success of walleye (Sander vitreus) under ecologically relevant downwelling light conditions DOI
Noland O. Michels, Quinnlan C. Smith, Loranzie S. Rogers

et al.

Environmental Biology of Fishes, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 4, 2025

Language: Английский

Citations

0
The decline of walleye populations: an ecological tipping point? DOI Creative Commons
Greg G. Sass

FACETS, Journal Year: 2025, Volume and Issue: 10, P. 1 - 17

Published: Jan. 1, 2025

Walleye/ogaa ( Sander vitreus (Mitchill)) (hereafter, walleye; ogaa = Ojibwe translation) populations have historically supported important multi-use, harvest-oriented fisheries. Despite intensive management, walleye declined in the midwestern United States raising concerns about sustainability of species. Numerous factors been implicated population declines, including climate change, habitat loss, invasive species, species-interactions, production overharvest (i.e., harvest consistently exceeding annual production), and changing angler behaviors. These negatively influenced natural recruitment contributed to depensatory dynamics. I provide a review perspective suggesting that current trajectory is at or nearing an ecological tipping point. Although fish are often considered compensatory density-dependent), appear prone depensation positive density dependence). My suggest management for misaligned. A change towards resource focus using ecosystem-based fisheries recognition as social–ecological systems needed conservation. If ensues, persistence will likely be further threatened because many drivers outside managerial control, those commonly used within control seemingly ineffective sustaining rehabilitating naturally reproducing populations.

Language: Английский

Citations

0
Limited Demographic Effects One Decade After Implementation of a Harvest‐Slot Length Limit for Walleye (Sander vitreus) in the St. Lawrence River, Québec, Canada DOI Open Access
Julien Mainguy, Yves Paradis, Rafael de Andrade Moral

et al.

Fisheries Management and Ecology, Journal Year: 2025, Volume and Issue: unknown

Published: March 23, 2025

ABSTRACT Although the role of recreational harvest on size structure declining fish populations is often unclear, bag and limits are implemented to prevent overharvest. Long‐term monitoring periodic assessments stock status then become necessary evaluate their potential impacts. Based a long‐term gillnet program in St. Lawrence River, Québec, Canada, effects 381–545 mm harvest‐slot length limit 2011 were evaluated walleye ( Sander vitreus ). Mixed‐effects models revealed continued declines abundance large walleyes, distribution, total annual mortality, female growth, condition, size‐at‐maturity. Expected impacts mostly not achieved, potentially because environmental trophic interaction changes addition increasing fishing pressure. Our results highlight need reassess current fisheries management strategies.

Language: Английский

Citations

0
The effects of light intensity and water clarity on growth rates of age-0 walleye (Sander vitreus) DOI
Noland O. Michels, Thomas R. Hrabik, Quinnlan C. Smith

et al.

Fisheries Research, Journal Year: 2025, Volume and Issue: 287, P. 107399 - 107399

Published: May 19, 2025

Language: Английский

Citations

0
Increased mercury concentrations in walleye and yellow perch in lakes invaded by zebra mussels DOI Creative Commons
Naomi S. Blinick, D. D. Link, Tyler D. Ahrenstorff

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 957, P. 177515 - 177515

Published: Nov. 20, 2024

Zebra mussels (Dreissena polymorpha) are invasive species that alter ecosystems and food webs with the potential to affect aquatic mercury cycling bioaccumulation in fishes, although effect of zebra on fish tissue has not been tested inland lakes. We assessed differences concentrations Minnesota lakes without while controlling for other lake watershed characteristics. Mercury adult walleye (Sander vitreus) yellow perch (Perca flavescens) were 72 % 157 higher, respectively, containing compared uninvaded young year (age-0) was also elevated, 97 82 higher age-0 perch, mussel Walleye exceeded 0.22 ppm - a threshold triggering more restrictive human consumption advisories sensitive populations at 23 smaller size, average-sized (420 mm) this rate 77 invaded lakes, 35 relied littoral resources but did feed meaningfully trophic levels. Increased by have consequential implications fisheries health.

Language: Английский

Citations

2
Assessing factors related to Walleye stocking success in the Midwestern United States DOI Creative Commons
Robert P. Davis, Daniel A. Isermann

North American Journal of Fisheries Management, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 15, 2024

Abstract Objective The objective of this study was to evaluate stocking success Walleye Sander vitreus in lakes and reservoirs across the Midwestern United States inform practices for state agencies. Demand may increase if climate change limits potential natural recruitment lakes. Consequently, strategic distribution maximize fishing opportunities. Methods We synthesized data from 2226 fry fingerling events on 653 used random forest algorithms mixed‐effects linear models identify abiotic biotic factors related success. Result Latitude year explained relatively little variation compared within‐lake variation. Relative abundance Largemouth Bass Micropterus nigricans an important indicator fingerlings, with generally decreasing increased bass abundance. There interaction between lake surface area growing degree‐days, as large (>2500 ha) seemed be more conducive regardless degree‐days. that we developed did not accurately predict exact levels but were 92–94% accurate predicting whether both fingerlings would at or above 50th percentile. Conclusion These findings help management allocation suggest future increases degree‐days could limit effectiveness some

Language: Английский

Citations

1
Climate warming and projected loss of thermal habitat volume in lake populations of brook trout DOI Creative Commons
Mark S. Ridgway, D. Smith,

Allan H. Bell

et al.

Canadian Journal of Fisheries and Aquatic Sciences, Journal Year: 2024, Volume and Issue: 81(5), P. 632 - 645

Published: Feb. 16, 2024

We applied an ensemble of climate warming models to iconic protected landscape (Algonquin Park, Ontario) and the seasonal temperature profile model for lakes assess changes in brook trout ( Salvelinus fontinalis) thermal habitat volume (THV) among different sizes 30-year periods under two scenarios (RCP 4.5 8.5). Bayesian beta regression show that lake size (surface area) morphometry (dynamic ratio) are important factors THV loss. loss increases as a function dynamic ratio (transition from bowl-shaped dish-shaped lakes). The magnitude this effect depends on category RCP scenario. Small (<100 ha) medium (100–500 projected have greater 2071–2100 (60%–100% 8.5; 40%–70% 4.5) than large (>500 similar shape. Climate projections balance century, regardless category, will result range widely morphometry.

Language: Английский

Citations

0