Local conditions drive interpopulation variation in field-based critical thermal maximum of brook trout DOI Creative Commons
Erin Stewart, Jacob C. Bowman, Chris C. Wilson

et al.

Conservation Physiology, Journal Year: 2024, Volume and Issue: 12(1)

Published: Jan. 1, 2024

Individual- and population-level responses to thermal change will be pivotal for species' resilience adaptive climate change. Thermal tolerance of ectotherms has been extensively studied under laboratory conditions, but comparatively few studies have assessed intra- interpopulation variation natural conditions or in situ. We measured field critical maximum (CTmax) brook trout (Salvelinus fontinalis) populations at twenty sites across Ontario, Canada, assess their situ examine potential factors underlying intraspecific performance. modelled CTmax as a function acclimation using short-term stream temperature data variation, used full-season temperatures calculate safety margins (TSM) each population. ranged between 27.41 30.46°C periods 4 40 days were strong predictors site CTmax, aligning closely with lab-based studies. Seasonal profiles varied substantially among sites, mean 30-day accounting 66% the among-site CTmax. TSMs 0.51 15.51°C reflected differences regimes. Streams watersheds more urban agricultural development had lowest addition those that fed by lake surface water. This work emphasizes importance locally based conservation management practices act below population level, local beyond partly responsible thus dictate resiliency

Language: Английский

Beware of using surrogates to investigate threatened species! DOI Creative Commons
Manuel E. Coffill‐Rivera

Conservation Physiology, Journal Year: 2025, Volume and Issue: 13(1)

Published: Jan. 1, 2025

Language: Английский

Citations

0
Non‐Lethally Produced Chemical Risk Cues Elicit Antipredator Responses in a Common Canadian Minnow DOI Creative Commons
Veronica Groves,

Christophe Brabant,

Madeline Boys

et al.

Ethology, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 7, 2025

ABSTRACT Predation risk exerts significant pressure on the survival of prey species and has many indirect impacts their habitat use, energy allocation, community dynamics. Prey must consistently assess surroundings by using multiple information sources to monitor predation respond accordingly. In aquatic environments, chemical signals (i.e., alarm cues, disturbance predator odors) play a crucial role in informing risk. Here, we systematically impact two non‐lethal cue odor, four aspects fish behavior common blackchin shiner ( Miniellus heterodon ), possible surrogate for Threatened pugnose anogenus ). experiment 1, found that conspecific elicited an increase activity relative controls. However, there were no changes area shoaling, or shelter use. 2, odor increased use shiner, consistent with antipredator strategy, but activity, shoaling. Our experiments suggest cues odors elicit different behavioral responses perhaps since vary urgency reliability. These results aimed provide baseline future work demonstrate value standardized methods, study threatened species.

Language: Английский

Citations

0
Local conditions drive interpopulation variation in field-based critical thermal maximum of brook trout DOI Creative Commons
Erin Stewart, Jacob C. Bowman, Chris C. Wilson

et al.

Conservation Physiology, Journal Year: 2024, Volume and Issue: 12(1)

Published: Jan. 1, 2024

Individual- and population-level responses to thermal change will be pivotal for species' resilience adaptive climate change. Thermal tolerance of ectotherms has been extensively studied under laboratory conditions, but comparatively few studies have assessed intra- interpopulation variation natural conditions or in situ. We measured field critical maximum (CTmax) brook trout (Salvelinus fontinalis) populations at twenty sites across Ontario, Canada, assess their situ examine potential factors underlying intraspecific performance. modelled CTmax as a function acclimation using short-term stream temperature data variation, used full-season temperatures calculate safety margins (TSM) each population. ranged between 27.41 30.46°C periods 4 40 days were strong predictors site CTmax, aligning closely with lab-based studies. Seasonal profiles varied substantially among sites, mean 30-day accounting 66% the among-site CTmax. TSMs 0.51 15.51°C reflected differences regimes. Streams watersheds more urban agricultural development had lowest addition those that fed by lake surface water. This work emphasizes importance locally based conservation management practices act below population level, local beyond partly responsible thus dictate resiliency

Language: Английский

Citations

1