Thermal habitat use and growth in young-of-the-year Arctic charr from proximal fluvial and lacustrine populations in Labrador, Canada

Sinnatamby, R. Niloshini; Shears, M.; Dempson, J. Brian; Power, Michael

doi:10.1016/j.jtherbio.2013.08.002

Cited by 6 publications

(4 citation statements)

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“…Questions remain as to how Arctic charr may ultimately respond to the rate of temperature change associated with climate warming (e.g. Lehtonen 1996;Murdoch & Power 2013;Sinnatamby et al 2013). Nevertheless, the marked phenotypic variation exhibited by the species suggests that phenotypic plasticity is likely to play a key role in defining Arctic charr responses to climate change and may ultimately facilitate genetic adaptation by buffering populations against the immediate negative consequences of environmental change (Fuller et al 2010;Fierst 2011).…”

Section: Discussionmentioning

confidence: 99%

“…Arctic charr populations from the southern extent of the range will face significant risks associated with rising temperatures and are more likely to face local extirpation if they are unable to behaviourally thermoregulate and utilise cooler hypolimnetic waters, where available (e.g. Lehtonen 1996;Murdoch & Power 2013;Sinnatamby et al 2013).…”

Section: Discussionmentioning

confidence: 99%

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Latitudinal variation in growth and otolith‐inferred field metabolic rates of Canadian young‐of‐the‐year Arctic charr

Sinnatamby

Dempson

Reist

et al. 2014

Ecology of Freshwater Fish

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Countergradient variation (CGV) is defined as genetic variation that counteracts the negative influences of the physical environment, minimising phenotypic variability along an environmental gradient. CGV is thought to have relevance in predicting the response of organisms to climate variability and change. To test the hypothesis that growth rate increased with latitude, consistent with CGV, young-of-the-year (YOY) Arctic charr, Salvelinus alpinus, were examined along a~27°latitudinal gradient in central and eastern Canada. Growth rates were estimated from fork lengths standardised by the thermal opportunity for growth based on experienced water temperatures derived using otolith oxygen stable isotopes. Results demonstrated patterns consistent with CGV, where northern populations demonstrated faster growth rates. A secondary aim was to test for similar geographical patterns in otolith-inferred metabolic rates, which reflect the energetic costs of standard metabolic rate (SMR) and other processes such as feeding, locomotion, thermoregulation, reproduction and growth. Results demonstrated a significant, positive relationship between otolith-inferred metabolic rate and latitude, which may reflect an increase in one, or a combination, of the above-noted physiological processes. The similar latitudinal pattern in growth and otolith-inferred metabolic rates suggests greater intake of food per unit of time by northern fish. The phenotypic variation in physiological traits observed here demonstrates the significant adaptability of Arctic charr to different thermal regimes with different growing season lengths. Determining the relative contributions of phenotypic plasticity and genetic variation to the observed latitudinal variation will be critical to predicting the responses of Arctic charr to climate change more accurately.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Latitudinal variation in growth and otolith‐inferred field metabolic rates of Canadian young‐of‐the‐year Arctic charr

Sinnatamby

Dempson

Reist

et al. 2014

Ecology of Freshwater Fish

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“…Warming in Alaska's Arctic could improve habitat conditions for pike, increasing their prevalence and enhancing their role as a top predator in Arctic food webs (Byström et al., 2007). Conversely, stenothermic cold‐water fishes such as Arctic charr ( S. alpinus ) could suffer from loss of habitat or contractions of their ranges (Chu et al., 2005; Reist et al., 2006), increased competition from other salmonids such as trout (Lento et al., 2019), and/or reduced growth and survival (Sinnatamby, Shears, Dempson, & Power, 2013) due to rising temperatures.…”

Section: Discussionmentioning

confidence: 99%

Diversity of diatoms, benthic macroinvertebrates, and fish varies in response to different environmental correlates in Arctic rivers across North America

et al. 2020

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1. Climate change poses a significant threat to Arctic freshwater biodiversity, but impacts depend upon the strength of organism response to climate-related drivers. Currently, there is insufficient knowledge about Arctic freshwater biodiversity patterns to guide assessment, prediction, and management of biodiversity change.2. As part of the Circumpolar Biodiversity Monitoring Program's first freshwater assessment, we evaluated diversity of diatoms, benthic macroinvertebrates, and fish in North American Arctic rivers. Alpha diversity was assessed in relation to temperature, water chemistry, bedrock geology, and glaciation history to identify important environmental correlates. Biotic composition was compared among groups to evaluate response to environmental gradients.3. Macroinvertebrate α-diversity declined strongly with increasing latitude from 48°N to 82°N, whereas diatom and fish diversity peaked around 70°N without a clear latitudinal decline. Macroinvertebrate diversity was significantly positively related to air temperature. Diatom diversity was related to bedrock geology and temperature, whereas fish diversity was related to glaciation history. Fish and macroinvertebrate assemblages differed between sites in western Canada,where invertebrate composition was more variable, and Alaska, where fish composition was more variable. In sites with both diatom and macroinvertebrate data, diatom composition was distinct in Alaska, where richness was highest in former glacial refugia. Macroinvertebrate composition was distinct in lowest-latitude eastern and high-latitude western Canadian sites where temperature was highest. 5. Temperature, precipitation, geology, calcium, and substrate size were important environmental correlates for diatoms and macroinvertebrates, although the relative importance of each correlate differed. Diatom taxa were most strongly

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“…Temperature higher than 16 °C is avoided by juveniles when they have access to colder refuges, as it is the lower bound of their higher critical range (Langeland and L'Abée-Lund 1998;Gilbert et al 2020). Nonetheless, in the D r a f t few studies conducted in natural environments, juveniles did not exhibit a clear preference for a specific temperature (Sinnatamby et al 2012;Godiksen et al 2012;Sinnatamby et al 2013). Fish habitat can be described and modelled at different spatial scales.…”

Section: Introductionmentioning

confidence: 99%

Summer stream habitat preferences of Nunavik anadromous Arctic char (Salvelinus alpinus) fry and parr

Dubos

St‐Hilaire

Bergeron

2022

Can. J. Fish. Aquat. Sci.

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Arctic char is a fish species known to occupy diverse habitats within the Arctic region. However, summer habitat use during the juvenile stage of the anadromous form is largely unknown. The present study aims to characterize fry and parr summer habitat preferences. Surveys were conducted by electrofishing, associated with physical habitat characterization on several rivers of the Ungava Bay, Nunavik, Canada. At the microhabitat and station scales, fry showed significant habitat preferences for shallow water and slow velocity. At the mesohabitat scale, fry showed a significant habitat selectivity for riffles. This habitat selectivity implies that habitat models can be built to evaluate the potential of habitat suitability for Arctic char fry. However, no significant habitat selectivity was found for parr. Parr size was nonetheless positively correlated with velocity, which was found to be a limitative factor for juvenile habitat use. This first attempt at modeling juvenile anadromous Arctic char habitat in rivers emphasizes the importance of selecting an appropriate spatial scale and reiterates the fact that parr showed relatively high plasticity in stream habitat selection.

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Thermal habitat use and growth in young-of-the-year Arctic charr from proximal fluvial and lacustrine populations in Labrador, Canada

Cited by 6 publications

References 96 publications

Latitudinal variation in growth and otolith‐inferred field metabolic rates of Canadian young‐of‐the‐year Arctic charr

Latitudinal variation in growth and otolith‐inferred field metabolic rates of Canadian young‐of‐the‐year Arctic charr

Diversity of diatoms, benthic macroinvertebrates, and fish varies in response to different environmental correlates in Arctic rivers across North America

Summer stream habitat preferences of Nunavik anadromous Arctic char (Salvelinus alpinus) fry and parr

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