Demographic patterns of walleye (Sander vitreus) reproductive success in a Wisconsin population

Evolutionary Applications, Год журнала: 2024, Номер 17(3)

Опубликована: Март 1, 2024

Abstract Harvest in walleye Sander vitreus fisheries is size‐selective and could influence phenotypic traits of spawners; however, contributions individual spawners to recruitment are unknown. We used parentage analyses using single nucleotide polymorphisms test whether parental were related the probability offspring survival Escanaba Lake, Wisconsin. From 2017 2020, 1339 adults 1138 juveniles genotyped 66% assigned at least one parent. Logistic regression indicated reproductive success (survival age‐0 first fall) was positively (but weakly) total length growth rate females, but not age. No analyzed for males. Our analysis identified model with predictors' year females models age males as most likely explain variation success. findings indicate that interannual (i.e., environmental conditions) plays a key role determining this population provide limited support female age, length, recruitment.

Язык: Английский

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Invasive control and native restoration: Directing ecosystem transformation through purposeful food web manipulations

Fisheries, Год журнала: 2025, Номер unknown

Опубликована: Янв. 22, 2025

ABSTRACT Ecosystems are abruptly changing due to invasive species and global climate change. In lakes, Rainbow Smelt Osmerus mordax can cause negative ecosystem effects through competitive predatory interactions with native leading food web shifts away from dominance, altered zooplankton communities, the decline or extirpation of cool coldwater fishes. We conducted two whole-lake removals simultaneous introductions Cisco Coregonus artedi stocking. About 327 1.6 adult Smelt/ha were removed about 45 Cisco/ha stocked over 4 years into experimental lakes. one system, Yellow Perch Perca flavscens relative abundance density significantly increased by 556% 143% post-manipulation, respectively. other Walleye Sander vitreus 26% became consistently present in pelagic zone post-manipulation (allowing for estimation). decreased >85% both The ecosystems shifted dominance while insignificant components webs. these intensive manipulations, we applied Resist–Accept–Direct (RAD) adaptation framework test an applicable ecological strategy used panarchy theory as ecologically grounded pathway purposefully direct transformation. this holistic management better understand manage undesired change—“food thinking.” context our study, directed towards structures, interactions, processes, which mitigated driven effects.

Язык: Английский

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The decline of walleye populations: an ecological tipping point?

FACETS, Год журнала: 2025, Номер 10, С. 1 - 17

Опубликована: Янв. 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.

Язык: Английский

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Diminishing productivity and hyperstable harvest in northern Wisconsin walleye fisheries

Canadian Journal of Fisheries and Aquatic Sciences, Год журнала: 2024, Номер 81(12), С. 1650 - 1665

Опубликована: Авг. 1, 2024

Managing fisheries in a changing socio-ecological environment may require holistic approaches for identifying and adapting to novel ecosystem dynamics. Using 32 years of Ceded Territory Wisconsin (CTWI) walleye ( Sander vitreus) data, we estimated production P), biomass B), turnover P/B), yield Y), over Y/P) tested hyperstability yield. Most CTWI populations showed low P B, Y/P < 1 . Yet, overharvest > 1) was prevalent among recruitment-based management (natural recruitment (NR), sustained only by stocking, combination). Production, P/B have declined NR populations, while Y remained constant. Walleye hyperstable along gradient all fishery types (i.e., angling only, angling/tribal harvest combined). Diminishing productivity be jointly contributing observed declines. We classified lakes into groups low, moderate, or high vulnerability based on dynamics identify that benefit from declines maintain increase the adaptive capacity walleye.

Язык: Английский

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Evaluating the contributions and economic costs for Walleye fry and fingerling stocking in a large midwestern reservoir

Fisheries Research, Год журнала: 2024, Номер 281, С. 107207 - 107207

Опубликована: Окт. 14, 2024

Язык: Английский

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