Cold-water habitats, climate refugia, and their utility for conserving salmonid fishes

Canadian Journal of Fisheries and Aquatic Sciences, Journal Year: 2023, Volume and Issue: 80(7), P. 1187 - 1206

Published: March 15, 2023

Anthropogenic climate change is warming global temperatures, with significant implications for salmonid fishes that depend on the availability of cold water during one or more life stages. Along southern range extents many species, and elsewhere warm temperatures are increasingly problematic, identification protection restoration habitats may serve as refugia where local populations can persist emerging an important conservation tactic. In this perspective piece, we address concept utility refugia—drawing a distinction commonly considered thermal refuges—describe technological advances enable accurate temperature mapping species distribution modeling in lotic environments, outline key uncertainties opportunities to chart constructive path forward topic will continue grow importance. Identifying not panacea conservation, but argue there tangible benefits doing so, least which options it affords thinking acting strategically within context changing century.

Language: Английский

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Vulnerability and resilience of hydropower generation under climate change scenarios: Haditha dam reservoir case study

Applied Energy, Journal Year: 2024, Volume and Issue: 366, P. 123308 - 123308

Published: May 2, 2024

Language: Английский

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Changes in lake sturgeon spawning periodicity is associated with prior reproductive effort

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: Jan. 30, 2025

Long-lived iteroparous organisms vary resource expenditures toward migration and reproduction in response to individual physical factors conspecific interactions, which can affect future reproductive timing interval. Reproductive actions lead trade-offs associated with allocations current vs. reproduction, including longer interval, require additional study. The objective of this study was evaluate associations between stream characteristics, behaviors, breeding demographics spawning periodicity lake sturgeon (Acipenser fulvescens). We used Radio Frequency Identification tags monitor by male (N = 1931) female 683) adults over seven consecutive years (2016 through 2022) the Black River, Cheboygan Co., MI. ordinal regression models quantify associations. Male (1.60 ± 0.63 years; mean SE) decreased increasing body size intra-sex interactions increased cumulative temperature, discharge, number inter-sex complete river migrations a season. Female (3.19 0.05 years, upstream swimming time interactions. Results demonstrated shortened as age, opportunities decreased, while may be more individualized is likely affected acquisition.

Language: Английский

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Brook Trout population response to Brown Trout removal by electrofishing in a Wisconsin Driftless Area stream

North American Journal of Fisheries Management, Journal Year: 2024, Volume and Issue: 44(3), P. 735 - 744

Published: June 1, 2024

Abstract Objective Populations of Brook Trout Salvelinus fontinalis have declined across their native range in North America due to a combination habitat loss, exploitation, and introductions nonnative salmonids. Brown Salmo trutta been widely introduced into streams Trout's likely displace from suitable habitat. We evaluated the population response removal Maple Dale Creek, Wisconsin Driftless Area stream, relative nearby control stream with similar sympatric Trout. Variation mean July temperature (11.6–16.4°C) among survey sites also allowed us examine whether summer was related removal. Methods Between 2019 2023, we completed 33.7 km single‐pass electrofishing during 56 site visits removed 20,495 7.1 Creek upstream an existing fish passage barrier. Concurrently, annual salmonid estimates were on reference stream. Result By biomass density age 1 older (age 1+) had decreased 1% or less levels. age‐1+ increased by factor 5.5 9.7. In contrast, our remained low relatively unchanged. positive all four but exhibited correlation temperature. Conclusion Our results add evidence that populations habitat, highlight utility restoring where downstream barriers are present, suggest suppression is positively

Language: Английский

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Shifting climate conditions affect recruitment in Midwestern stream trout, but depend on seasonal and spatial context

Ecosphere, Journal Year: 2022, Volume and Issue: 13(12)

Published: Dec. 1, 2022

Abstract Climate change is a complex threat to freshwater ecosystems. Effects on aquatic species will likely differ among populations depending seasonal and spatial context, which makes detailed understanding of population responses shifting climate conditions key guiding strategic decision‐making. However, few empirical studies have tested for such context dependency distinct across seasons or at large scales. We used 26 years standardized survey data recreationally economically important brook trout ( Salvelinus fontinalis ) brown Salmo trutta in Wisconsin, USA assess short‐ long‐term variability trends, quantify the influence (air temperatures precipitation) annual recruitment strength (as indexed by young‐of‐year [YOY] relative abundance summer). Some short‐term fluctuations were spatially consistent state, indicative broadscale environmental forcing. Over longer term, average YOY age 1 older has declined since 2006, especially YOY, while substantially increased. The effects varied species, season, latitude. Increasing maximum summer associated with lower recruitment, but higher recruitment. effect both was stronger latitudes. Spring positively related latitudes; mid‐latitude northern streams, they increasing up about standard deviation, above declined. High low winter spring precipitation precipitous declines species. By contrast, streams southern trout. Our results demonstrate that shifts can affect similar differently temporal (seasonal) (warm, regions compared cool, regions) context. Given trends Wisconsin projections Midwestern United States, location‐ species‐specific management actions are needed account this dependency. Management should aim maximize resiliency extreme buffering negative influences

Language: Английский

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Spatial asynchrony and cross‐scale climate interactions in populations of a coldwater stream fish

Global Change Biology, Journal Year: 2023, Volume and Issue: 30(1)

Published: Nov. 21, 2023

Abstract Climate change affects populations over broad geographic ranges due to spatially autocorrelated abiotic conditions known as the Moran effect. However, do not always respond broad‐scale environmental changes synchronously across a landscape. We combined multiple datasets for retrospective analysis of time‐series count data (5–28 annual samples per segment) at 144 stream segments dispersed nearly 1,000 linear kilometers range characterize population structure and scale spatial synchrony southern native coldwater fish (brook trout, Salvelinus fontinalis ), which is sensitive temperature flow variations. Spatial differed by life stage region: it was stronger in juvenile than adult northern sub‐region sub‐region. trout extended 100–200 km but much weaker that climate variables such temperature, precipitation, flow. Early abundance changed time variation summer winter spring conditions. effects on between sub‐regions among local within sub‐regions, indicating cross‐scale interactions where interacted with habitat generate only modest pattern space. Overall, our showed higher degrees response heterogeneity consequently asynchrony previously shown based individual, geographically restricted datasets. This indicates certain characterized resistance could represent unique this iconic warrant targeted conservation. Advancing conservation species can include actions identify priority incorporate them into landscape‐level planning. Our approach applicable other widespread aquatic change.

Language: Английский

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Addressing Coldwater Temperature Impairment in a Changing Climate

Fisheries, Journal Year: 2023, Volume and Issue: 48(8), P. 324 - 330

Published: May 19, 2023

Abstract Climate change is concerning for fisheries professionals because increased water temperatures threaten coldwater habitats, which are vital to recreational and commercial keystone species. The Clean Water Act provides a legal framework identify address quality impairments including those associated with temperature. Although this basic strategy impairments, develop total maximum daily loads, reduce pollution, it does not explicitly consider the challenges of changing climate in addressing impairments. administrators can facilitate temperature restoration planning implementation using link stakeholders management resources. Stakeholder engagement collaboration, robust local monitoring, incorporating resilience into will promote comprehensive effects on fisheries.

Language: Английский

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Microgeographic variation in demography and thermal regimes stabilize regional abundance of a widespread freshwater fish

Ecological Applications, Journal Year: 2023, Volume and Issue: 34(2)

Published: Dec. 10, 2023

Abstract Predicting the persistence of species under climate change is an increasingly important objective in ecological research and management. However, biotic abiotic heterogeneity can drive asynchrony population responses at small spatial scales, complicating species‐level assessments. For widely distributed consisting many fragmented populations, such as brook trout ( Salvelinus fontinalis ), understanding drivers dynamics improve predictions range‐wide impacts. We analyzed demographic time series from mark–recapture surveys 11 natural populations eastern Canada over 13 years to examine extent, drivers, consequences fine‐scale variation. The focal were genetically differentiated, occupied a area (~25 km 2 ) with few human impacts, experienced similar conditions. Recruitment was highly asynchronous, weakly related variables showed population‐specific relationships other processes, generating diverse dynamics. In contrast, individual growth mostly synchronized among driven by shared positive relationship stream temperature. Outputs models unrelated four five hypothesized (recruitment, growth, reproductive success, phylogenetic distance), but variation groundwater inputs strongly influenced temperature regimes stock–recruitment relationships. Finally, generated portfolio effect that stabilized regional abundance. Our results demonstrated demographics habitat diversity microgeographic scales play significant role moderating change. Moreover, we suggest absence activities within study streams preserved contributed abundance, while eased monitoring increased likelihood detecting asynchrony. Therefore, anthropogenic degradation, landscape context, scale must be considered when developing management strategies monitor maintain are diverse, stable, resilient

Language: Английский

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Groundwater Springs Influence Fish Community Distribution and Trout Condition across a Longitudinal Gradient in a Coldwater Catchment in Southeastern Minnesota, USA

Water, Journal Year: 2024, Volume and Issue: 16(14), P. 1961 - 1961

Published: July 11, 2024

The thermal conditions of transitional (ranging from warm to cold) coldwater streams impact the ranges and resource availabilities for biota inhabiting these lotic systems. With ongoing climate change increasing land modifications, boundaries may shift, altering transition zones their biotic communities. objective this study was investigate condition trout across three forks Whitewater River catchment, located in southeastern Minnesota, factors influencing fish community composition distribution. Each fork characterized into separate sections: headwater (coolwater), middle (warmwater), lower (coldwater). Springs were identified throughout each fork, with greatest concentrations sections fork. Using single-pass electrofishing, we sampled 61 sites system (North = 21 sites, Middle 19, South 21), catch statistics used calculate diversity, abundance, condition. In general, diversity increased, healthier but less abundant sections, whereas decreased slightly, decreased, abundance increased reaches, changes differing somewhat among forks. Canonical correlation analysis highlighted strong significant correlations showing that Simpson increase going upstream, high non-trout while rates decrease width narrows. is a catchment exhibiting temperature-pattern characteristics generally low range thin, normal, robust. Dominated by changing landscape (agriculture) intensifying change, begin see stream temperatures along species diversity. Understanding how spring temperature influences distribution can bring potential stressors light, our understanding helping mitigate negative impacts use change.

Language: Английский

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