Temperature selection in Brook Charr: lab experiments, field studies, and matching the Fry curve

Smith, D.; Ridgway, Mark S.

doi:10.1007/s10750-018-3869-4

Cited by 34 publications

(29 citation statements)

References 61 publications

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“…To quantify habitat‐specific temperature, we counted the number of days that littoral and pelagic habitat water temperatures were greater than 15°C and 10°C, respectively. Brook Trout‐specific literature (Smith & Ridgway, 2019) suggest that the average preference is 15°C, with several experiments showing habitat use at temperatures > and <15°C. However, among studies which explicitly used field data, 80% showed temperature preferences <15°C (Smith & Ridgway, 2019).…”

Section: Methodsmentioning

confidence: 99%

“…Brook Trout are an opportunistic feeder often selecting for the most abundant and easily captured prey item (Tiberti et al, 2016). Brook Trout resource selection has also been shown to be influenced by water temperature and other environmental conditions (Biro, 1998; Smith & Ridgway, 2019). Brook Trout responses to both food availability and environmental conditions make them an appropriate species to determine how consumers respond to perturbations to resource availability and habitat thermal conditions.…”

Section: Methodsmentioning

confidence: 99%

“…Brook Trout‐specific literature (Smith & Ridgway, 2019) suggest that the average preference is 15°C, with several experiments showing habitat use at temperatures > and <15°C. However, among studies which explicitly used field data, 80% showed temperature preferences <15°C (Smith & Ridgway, 2019). Regional differences can regulate thermal tolerance and preference of Brook Trout with populations in northern latitudes exhibiting lower thermal tolerances than those in southern latitudes (Stitt et al., 2014) suggesting that similar adaptations are likely at higher altitudes.…”

Section: Methodsmentioning

confidence: 99%

Section: Study Sitementioning

confidence: 99%

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Ecosystem response to earlier ice break‐up date: Climate‐driven changes to water temperature, lake‐habitat‐specific production, and trout habitat and resource use

Caldwell

Chandra

Feher

et al. 2020

Global Change Biology

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Climate warming has yielded earlier ice break‐up dates in recent decades for lakes leading to water temperature increases, altered habitat, and both increases and decreases to ecosystem productivity. Within lakes, the effect of climate warming on secondary production in littoral and pelagic habitats remains unclear. The intersection of changing habitat productivity and warming water temperatures on salmonids is important for understanding how climate warming will impact mountain ecosystems. We develop and test a conceptual model that expresses how earlier ice break‐up dates influence within lake habitat production, water temperatures and the habitat utilized by, resources obtained and behavior of salmonids in a mountain lake. We measured zoobenthic and zooplankton production from the littoral and pelagic habitats, thermal conditions, and the habitat use, resource use, and fitness of Brook Trout (Salvelinus fontinalis). We show that earlier ice break‐up conditions created a "resource‐rich" littoral–benthic habitat with increases in zoobenthic production compared to the pelagic habitat which decreased in zooplankton production. Despite the increases in littoral–benthic food resources, trout did not utilize littoral habitat or zoobenthic resources due to longer durations of warm water temperatures in the littoral zone. In addition, 87% of their resources were supported by the pelagic habitat during periods with earlier ice break‐up when pelagic resources were least abundant. The decreased reliance on littoral–benthic resources during earlier ice break‐up caused reduced fitness (mean reduction of 12 g) to trout. Our data show that changes to ice break‐up drive multi‐directional results for resource production within lake habitats and increase the duration of warmer water temperatures in food‐rich littoral habitats. The increased duration of warmer littoral water temperatures reduces the use of energetically efficient habitats culminating in decreased trout fitness.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Study Sitementioning

confidence: 99%

See 2 more Smart Citations

Ecosystem response to earlier ice break‐up date: Climate‐driven changes to water temperature, lake‐habitat‐specific production, and trout habitat and resource use

Caldwell

Chandra

Feher

et al. 2020

Global Change Biology

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show abstract

“…The typical spawning period is autumn [ 6 ], spawning usually takes place between August and December when water temperatures begin dropping after summer [ 7 ]. Based on previous studies, it can be assumed that spawning and optimal growth of brook trout occurred in temperatures as high as 16 °C [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Non-Circadian Photoperiod on Growth and Puberty Onset of Brook Trout Salvelinus fontinalis Mitchill

Lundova

Matoušek

Stejskal

2021

Animals

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The aim of the present study was to assess the effects of a prolonged photoperiod on growth rate and sexual maturation in brook trout Salvelinus fontinalis. The task of the experiment was to determine the most effective light regimen capable to minimizing the effects of puberty, including impairment of somatic growth and further general characteristics. In this regard, the studied fish were reared under three photoperiod regimens in which fish were exposed to 24 h continuous light alternating with 24 or 48 h under the ambient photoperiod or 48 h continuous light alternating with a 24 h ambient photoperiod. A control group was reared under the natural ambient photoperiod. Four-hundred and fifty fish with an average initial body weight of 101.3 ± 1.2 g were used for each experimental group (three replicates of each treatment plus control). A statistically lower growth rate showed control groups in both sexes. At the end of the study, control males had an average body weight of 226.6 ± 39.8 g and control females a body weight of 199.8 ± 12.2 g. At the same period, a significantly higher average body weight was found in groups reared 24 h under ambient photoperiod alternating with a 48 h continuous light regime (2CP:1AP) in both sexes (296.56 ± 62.5 g—males, and 239.9 ± 19.2 g—females, respectively). A significantly higher percentage of sexually mature fish was observed in the control group (80% of males and 29% of females, respectively). We found significantly fewer sexually mature females compared to males. The lowest survival was observed in group 2CP:1AP at 92%. It was concluded that regimen under which fish was exposed to 48 h of natural ambient photoperiod alternating with 24 h of constant light (1CP:2AP) lead to the successful delay of gonad development and onset of puberty and increased somatic growth in both sexes.

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

Gallagher,

Fraser

2023

Ecological Applications

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Predicting the persistence of species under climate change is an increasingly important objective in ecological research and management. However, biotic and abiotic heterogeneity can drive asynchrony in population responses at small spatial scales, complicating species‐level assessments. For widely distributed species consisting of many fragmented populations, such as brook trout (Salvelinus fontinalis), understanding the drivers of asynchrony in population dynamics can improve the predictions of range‐wide climate impacts. We analyzed the demographic time series from mark–recapture surveys of 11 natural brook trout populations in eastern Canada over 13 years to examine the extent, drivers, and consequences of fine‐scale population variation. The focal populations were genetically differentiated, occupied a small area (~25 km2) with few human impacts, and experienced similar climate conditions. Recruitment was highly asynchronous, weakly related to climate variables and showed population‐specific relationships with other demographic processes, generating diverse population dynamics. In contrast, individual growth was mostly synchronized among populations and driven by a shared positive relationship with stream temperature. Outputs from population‐specific models were unrelated to four of the five hypothesized drivers (recruitment, growth, reproductive success, phylogenetic distance), but variation in groundwater inputs strongly influenced stream temperature regimes and stock–recruitment relationships. Finally, population asynchrony generated a portfolio effect that stabilized regional species abundance. Our results demonstrated that population demographics and habitat diversity at microgeographic scales can play a significant role in moderating species responses to climate change. Moreover, we suggest that the absence of human activities within study streams preserved natural habitat variation and contributed to asynchrony in brook trout abundance, while the small study area eased monitoring and increased the likelihood of detecting asynchrony. Therefore, anthropogenic habitat degradation, landscape context, and spatial scale must be considered when developing management strategies to monitor and maintain populations that are diverse, stable, and resilient to climate change.

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Temperature selection in Brook Charr: lab experiments, field studies, and matching the Fry curve

Cited by 34 publications

References 61 publications

Ecosystem response to earlier ice break‐up date: Climate‐driven changes to water temperature, lake‐habitat‐specific production, and trout habitat and resource use

Ecosystem response to earlier ice break‐up date: Climate‐driven changes to water temperature, lake‐habitat‐specific production, and trout habitat and resource use

The Effect of Non-Circadian Photoperiod on Growth and Puberty Onset of Brook Trout Salvelinus fontinalis Mitchill

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

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