Contribution of warm habitat to cold‐water fisheries

Hahlbeck, Nick; Tinniswood, William; Sloat, Matthew R.; Ortega, Jordan D.; Wyatt, Matthew A; Hereford, Mark E.; Ramirez, Ben S.; Crook, David A.; Anlauf-Dunn, Kara; Armstrong, Jonathan B.

doi:10.1111/cobi.13857

Cited by 15 publications

(34 citation statements)

References 64 publications

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“…Despite the constraints highlighted above, these data have wide applicability from helping to define parameters in bioenergetics models (e.g. optimal temperatures at which aerobic scope is maximized), to providing an understanding of movement and survival strategies among individuals from fragmented habitats ( Armstrong et al , 2021 ; Hahlbeck et al. , 2021 ).…”

Section: Discussionmentioning

confidence: 99%

Intraspecific variability in thermal tolerance: a case study with coastal cutthroat trout

Anlauf-Dunn

Kraskura

Eliason

2022

Conservation Physiology

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Fish physiological performance is directly regulated by their thermal environment. Intraspecific comparisons are essential to ascertain the vulnerability of fish populations to climate change and to identify which populations may be more susceptible to extirpation and which may be more resilient to continued warming. In this study, we sought to evaluate how thermal performance varies in coastal cutthroat trout (Oncorhynchus clarki clarki) across four distinct watersheds in OR, USA. Specifically, we measured oxygen consumption rates in trout from the four watersheds with variable hydrologic and thermal regimes, comparing three ecologically relevant temperature treatments (ambient, annual maximum and novel warm). Coastal cutthroat trout displayed considerable intraspecific variability in physiological performance and thermal tolerance across the four watersheds. Thermal tolerance matched the historical experience: the coastal watersheds experiencing warmer ambient temperatures had higher critical thermal tolerance compared with the interior, cooler Willamette watersheds. Physiological performance varied across all four watersheds and there was evidence of a trade-off between high aerobic performance and broad thermal tolerance. Given the evidence of climate regime shifts across the globe, the uncertainty in both the rate and extent of warming and species responses in the near and long term, a more nuanced approach to the management and conservation of native fish species must be considered.

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Section: Discussionmentioning

confidence: 99%

Intraspecific variability in thermal tolerance: a case study with coastal cutthroat trout

Anlauf-Dunn

Kraskura

Eliason

2022

Conservation Physiology

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“…The greatest probability of presence for both SSP scenarios occurred in high-elevation areas, with the exception of the desert sites. This result indicates the potential for elevation, which was correlated with climate in our study, to influence the distribution of tially indicating that populations could be sustained or even improve as temperatures move closer to the optimal growth temperatures (Bear et al, 2007;Hahlbeck et al, 2021) (Table 4). In contrast, ENMchange values were negative for all study sites for the high-emission scenario (Table 4).…”

Section: Climate Change Assessmentmentioning

confidence: 54%

“…Callahan is a cold site, Trail Creek a cool site), but are highly divergent from other populations for environmental variables including mean diurnal temperature range, isothermality, annual temperature range and minimum temperature of the coldest month (Figure 5b). Two of these variables, mean diurnal temperature range and isothermality, also had the largest number of significant genetic associations for Large temperature variation could affect physiology and growth rates at higher temperatures (e.g., Colinet et al, 2015;Oligny-Hebert et al, 2015) and could promote the evolution of enhanced adfluvial migratory capabilities to access thermal refugia in nearby lakes and reservoirs that would be expected to improve growth and survival (Hahlbeck et al, 2021). For example, one of the Kootenai River populations (Trail Creek) appears to be adfluvial, migrating as yearlings and returning as adults.…”

Section: Discussionmentioning

confidence: 99%

Whole genome resequencing identifies local adaptation associated with environmental variation for redband trout

et al. 2022

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Aquatic ectotherms are predicted to harbour genomic signals of local adaptation resulting from selective pressures driven by the strong influence of climate conditions on body temperature. We investigated local adaptation in redband trout (Oncorhynchus mykiss gairdneri) using genome scans for 547 samples from 11 populations across a wide range of habitats and thermal gradients in the interior Columbia River. We estimated allele frequencies for millions of single nucleotide polymorphism loci (SNPs) across populations using low‐coverage whole genome resequencing, and used population structure outlier analyses to identify genomic regions under divergent selection between populations. Twelve genomic regions showed signatures of local adaptation, including two regions associated with genes known to influence migration and developmental timing in salmonids (GREB1L, ROCK1, SIX6). Genotype–environment association analyses indicated that diurnal temperature variation was a strong driver of local adaptation, with signatures of selection driven primarily by divergence of two populations in the northern extreme of the subspecies range. We also found evidence for adaptive differences between high‐elevation desert vs. montane habitats at a smaller geographical scale. Finally, we estimated vulnerability of redband trout to future climate change using ecological niche modelling and genetic offset analyses under two climate change scenarios. These analyses predicted substantial habitat loss and strong genetic shifts necessary for adaptation to future habitats, with the greatest vulnerability predicted for high‐elevation desert populations. Our results provide new insight into the complexity of local adaptation in salmonids, and important predictions regarding future responses of redband trout to climate change.

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“…The predominance of mainstem residence during summer suggests that this tactic is generally more profitable for fish than moving to cooler habitats. This could be because the foraging opportunities in warmer mainstem habitats outweigh the higher metabolic costs fish incur (Hahlbeck et al, 2021; Lusardi et al, 2020). Factors such as water clarity or habitat structure may also increase predation risk in cold‐water alcoves (e.g., from osprey or otters), which could contribute to fish remaining in the warmer mainstem river.…”

Section: Discussionmentioning

confidence: 99%

Move, migrate, or tolerate: Quantifying three tactics for cold‐water fish coping with warm summers in a large river

Barrett

Armstrong

2022

Ecosphere

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Mainstem rivers are important for provisioning cold‐water fisheries and often support fluvial life histories that grow much larger than resident counterparts in tributaries. However, mainstem rivers are also warmer than tributaries during summer and more tightly coupled to regional climate. A key challenge is to understand how fluvial life histories cope with summer temperatures in mainstem rivers, both now and in a warmer future. Here, we outline three options: tolerance, exploitation of cool microhabitats, or migration to cooler tributaries. We quantified the relative prevalence of these responses in the wild using a Lagrangian approach. Specifically, we used temperature transmitting radio‐tags to track coastal cutthroat trout (Oncorhynchus clarkii clarkii) habitat use across 100 km of the Willamette River, which exhibited a maximum temperature of 22°C. We found that 89.8% of fish stayed in the mainstem and tolerated high temperatures; 6.5% of the population exploited cool floodplain alcoves; and 3.7% moved into a cool tributary, the McKenzie River. We also found that on average, larger fish opted to use cold‐water refuge habitats rather than tolerate mainstem river temperatures. The expression of all three coping tactics suggests this population has adaptive capacity to respond to future warming. More work is needed to understand how the relative expression of these tactics change depending on the severity of heat stress or nontemperature attributes of mainstem, floodplain, and tributary habitat.

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Contribution of warm habitat to cold‐water fisheries

Abstract: Article impact statement: Warm downstream habitats may be critical for cold-water fisheries but are overlooked by climate adaptation planning.

Cited by 15 publications

References 64 publications

Intraspecific variability in thermal tolerance: a case study with coastal cutthroat trout

Intraspecific variability in thermal tolerance: a case study with coastal cutthroat trout

Whole genome resequencing identifies local adaptation associated with environmental variation for redband trout

Move, migrate, or tolerate: Quantifying three tactics for cold‐water fish coping with warm summers in a large river

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