Depensation in fish recruitment driven by context-dependent interactions with another predator

Fisheries Research, Год журнала: 2023, Номер 262, С. 106675 - 106675

Опубликована: Фев. 26, 2023

Язык: Английский

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Assessing factors related to Walleye stocking success in the Midwestern United States

North American Journal of Fisheries Management, Год журнала: 2024, Номер unknown

Опубликована: Сен. 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

Язык: Английский

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Lake temperature and morphometry shape the thermal composition of recreational fishing catch

Transactions of the American Fisheries Society, Год журнала: 2024, Номер unknown

Опубликована: Окт. 11, 2024

Abstract Objective Managing freshwater fisheries in warming lakes is challenging because climate change impacts anglers, fish, and their interactions. Methods We integrated recent models of current future lake temperatures with recreational catch data from 587 three north‐central U.S. states (Michigan, Minnesota, Wisconsin) to evaluate how the thermal composition varied as a function temperature, ice coverage, morphometry. Result found that warmwater share (WCS), defined proportion fish angling belonged guild (final temperature preferendum [FTP] > 25°C), increased average annual surface decreased survey coverage. However, we also WCS area depth. Using mid‐century (2040–2060) water projections while holding all other variables constant, predicted will likely increase warms but significant heterogeneity persist. Conclusion Lakes are large (>100 ha) deep (>10 m) those cooler (<3700 growing degree‐days) hold refugia for coolwater (FTP = 19–25°C) coldwater < 19°C) even rise, creating potential management actions resist shift fisheries. Managers smaller more rapidly may want consider strategies accept or direct emerging fishing opportunities. suggest most viable path adaptation landscapes diverse be shifts where possible rise opportunities necessary.

Язык: Английский

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Biotic and abiotic factors that influence Walleye recruitment in stocked lakes in Michigan

North American Journal of Fisheries Management, Год журнала: 2023, Номер 43(6), С. 1673 - 1686

Опубликована: Ноя. 7, 2023

Abstract Objective In recent decades, widespread evidence of declining Walleye Sander vitreus recruitment in the Midwestern United States has raised concerns about diminishing ecological benefits and fishing opportunities, which turn resulted natural resource agencies using stocking to supplement populations. Success events vary; thus, evaluating external factors that influence success resulting from or production is critical for improved management. Methods We evaluated influencing relative 98 lakes stocked annually with by integrating 20 years data fisheries assessment abiotic data. indexed as abundance cohorts sources combined used boosted regression tree modeling identify variables are associated varying recruitment. Result Growing degree‐days at age 1, shoreline development index, mean depth, 2 were most important variables. The model explained 17% observed variability A positive relationship between growing was observed, whereas lake depth had a negative Secondarily predictors surface area, spring warming rate, Northern Pike Esox lucius abundance, 0. general, positively these predictors, exceptions rates >0.3°C/day being exposed >3500 Conclusion Our results indicate thermal addition characteristics drivers waters highlights potential managers use this information prioritize efforts temperate lakes.

Язык: Английский

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Managing fisheries within a RAD framework: Concepts and applications

Fisheries Management and Ecology, Год журнала: 2022, Номер 29(4), С. 323 - 328

Опубликована: Июнь 23, 2022

AJL is an Associate Editor for Fisheries Management and Ecology. Neither author has any conflicts to declare. No new data were generated in creating this manuscript.

Язык: Английский

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