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  • 1
    Online Resource
    Online Resource
    Selection for upper thermal tolerance in rainbow trout ( Oncorhynchus mykiss Walbaum)
    The Company of Biologists ; 2015
    In:  Journal of Experimental Biology Vol. 218, No. 5 ( 2015-03-01), p. 803-812
    Details
    In: Journal of Experimental Biology, The Company of Biologists, Vol. 218, No. 5 ( 2015-03-01), p. 803-812
    Abstract: Rainbow trout (Oncorhynchus mykiss Walbaum) in southern Western Australia have undergone passive selection for over 19 generations to survive high water temperatures. Based on the conceptual model of ‘oxygen- and capacity-limited thermal tolerance’, we measured critical thermal maximum (CTmax), maximum heart rate (fH,max) and aerobic scope to test the hypothesis that these rainbow trout can maintain aerobic scope at high temperatures through a robust cardiac performance supporting oxygen delivery. Across five family groups CTmax averaged 29.0±0.02°C. Aerobic scope was maximized at 15.8±0.3°C (Topt), while the upper pejus temperature (Tpej, set at 90% of maximum aerobic scope) was 19.9±0.3°C. Although aerobic scope decreased at temperatures above Topt, the value at 25°C remained well over 40% of the maximum. Furthermore, pharmacologically stimulated fH,max increased with temperature, reaching a peak value between 23.5±0.4 and 24.0±0.4°C (Tmax) for three family groups. The Arrhenius breakpoint temperature (TAB) for fH,max was 20.3±0.3 to 20.7±0.4°C, while the average Q10 breakpoint temperature (TQB, when the incremental Q10 & lt;1.6) for fH,max was 21.6±0.2 to 22.0±0.4°C. Collectively, fH,max progressively became less temperature dependent beyond 20°C (TAB and TQB), which coincides with the upper Tpej for aerobic scope. Although upper thermal performance indices for both aerobic scope and fH,max were compared among family groups in this population, appreciable differences were not evident. Compared with other populations of rainbow trout, the present assessment is consistent with the prediction that this strain has undergone selection and shows the ability to tolerate higher water temperatures.
    Type of Medium: Online Resource
    ISSN: 1477-9145 , 0022-0949
    URL: Article
    DOI: 10.1242/jeb.113993
    Language: English
    Publisher: The Company of Biologists
    Publication Date: 2015
    detail.hit.zdb_id: 1482461-9
    SSG: 12
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  • 2
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    Online Resource
    Whole genome resequencing identifies local adaptation associated with environmental variation for redband trout
    Wiley ; 2023
    In:  Molecular Ecology Vol. 32, No. 4 ( 2023-02), p. 800-818
    Details
    In: Molecular Ecology, Wiley, Vol. 32, No. 4 ( 2023-02), p. 800-818
    Abstract: 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.
    Type of Medium: Online Resource
    ISSN: 0962-1083 , 1365-294X
    URL: Issue
    URL: Article
    DOI: 10.1111/mec.v32.4
    DOI: 10.1111/mec.16810
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2020749-9
    detail.hit.zdb_id: 1126687-9
    SSG: 12
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  • 3
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    Mechanisms of thermal adaptation and evolutionary potential of conspecific populations to changing environments
    Wiley ; 2018
    In:  Molecular Ecology Vol. 27, No. 3 ( 2018-02), p. 659-674
    Details
    In: Molecular Ecology, Wiley, Vol. 27, No. 3 ( 2018-02), p. 659-674
    Abstract: Heterogeneous and ever‐changing thermal environments drive the evolution of populations and species, especially when extreme conditions increase selection pressure for traits influencing fitness. However, projections of biological diversity under scenarios of climate change rarely consider evolutionary adaptive potential of natural species. In this study, we tested for mechanistic evidence of evolutionary thermal adaptation among ecologically divergent redband trout populations ( Oncorhynchus mykiss gairdneri ) in cardiorespiratory function, cellular response and genomic variation. In a common garden environment, fish from an extreme desert climate had significantly higher critical thermal maximum ( p  〈   .05) and broader optimum thermal window for aerobic scope ( 〉 3°C) than fish from cooler montane climate. In addition, the desert population had the highest maximum heart rate during warming (20% greater than montane populations), indicating improved capacity to deliver oxygen to internal tissues. In response to acute heat stress, distinct sets of cardiac genes were induced among ecotypes, which helps to explain the differences in cardiorespiratory function. Candidate genomic markers and genes underlying these physiological adaptations were also pinpointed, such as genes involved in stress response and metabolic activity ( hsp40 , ldh‐b and camkk2 ). These markers were developed into a multivariate model that not only accurately predicted critical thermal maxima, but also evolutionary limit of thermal adaptation in these specific redband trout populations relative to the expected limit for the species. This study demonstrates mechanisms and limitations of an aquatic species to evolve under changing environments that can be incorporated into advanced models to predict ecological consequences of climate change for natural organisms.
    Type of Medium: Online Resource
    ISSN: 0962-1083 , 1365-294X
    URL: Issue
    URL: Article
    DOI: 10.1111/mec.2018.27.issue-3
    DOI: 10.1111/mec.14475
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2018
    detail.hit.zdb_id: 2020749-9
    detail.hit.zdb_id: 1126687-9
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  • 4
    Online Resource
    Online Resource
    Whole genome resequencing reveals genomic regions associated with thermal adaptation in redband trout
    Wiley ; 2021
    In:  Molecular Ecology Vol. 30, No. 1 ( 2021-01), p. 162-174
    Details
    In: Molecular Ecology, Wiley, Vol. 30, No. 1 ( 2021-01), p. 162-174
    Abstract: Adaptation to local environments involves evolution of ecologically important traits and underlying physiological processes. Here, we used low coverage whole‐genome resequencing (lcWGR) on individuals to identify genome regions involved in thermal adaptation in wild redband trout Oncorhynchus mykiss gairdneri , a subspecies of rainbow trout that inhabits ecosystems ranging from cold montane forests to high elevation deserts. This study includes allele frequency‐based analyses for selective sweeps among populations, followed by multiple association tests for specific sets of phenotypes measured under thermal stress (acute and chronic survival/mortality; high or low cardiac performance groups). Depending on the groups in each set of analyses, sequencing reads covered 43%–75% of the genome at ≥15× and each analysis included millions of SNPs across the genome. In tests for selective sweeps among populations, a total of six chromosomal regions were significant. The further association tests for specific phenotypes revealed that the region on chromosome 4 was consistently the most significant and contains the cerk gene (ceramide kinase). This study provides insight into a potential genetic mechanism of local thermal adaptation and suggests c erk may be an important candidate gene. However, further validation of this cerk gene is necessary to determine if the association with cardiac performance results in a functional role to influence thermal performance when exposed to high water temperatures and hypoxic conditions.
    Type of Medium: Online Resource
    ISSN: 0962-1083 , 1365-294X
    URL: Issue
    URL: Article
    DOI: 10.1111/mec.v30.1
    DOI: 10.1111/mec.15717
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 2020749-9
    detail.hit.zdb_id: 1126687-9
    SSG: 12
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  • 5
    Online Resource
    Online Resource
    Physiological and genomic signatures of evolutionary thermal adaptation in redband trout from extreme climates
    Wiley ; 2018
    In:  Evolutionary Applications Vol. 11, No. 9 ( 2018-10), p. 1686-1699
    Details
    In: Evolutionary Applications, Wiley, Vol. 11, No. 9 ( 2018-10), p. 1686-1699
    Abstract: Temperature is a master environmental factor that limits the geographical distribution of species, especially in ectotherms. To address challenges in biodiversity conservation under ongoing climate change, it is essential to characterize relevant functional limitations and adaptive genomic content at population and species levels. Here, we present evidence for adaptive divergence in cardiac function and genomic regions in redband trout ( Oncorhynchus mykiss gairdneri ) populations from desert and montane streams. Cardiac phenotypes of individual fish were measured in the field with a custom‐built electrocardiogram apparatus. Maximum heart rate and its rate limiting temperature during acute warming were significantly higher in fish that have evolved in the extreme of a desert climate compared to a montane climate. Association mapping with 526,301 single nucleotide polymorphisms ( SNP s) across the genome revealed signatures of thermal selection both within and among ecotypes. Among desert and montane populations, 435 SNP s were identified as putative outliers under natural selection and 20 of these loci showed significant association with average summer water temperatures among populations. Phenotypes for cardiac performance were variable within each ecotype, and 207 genomic regions were strongly associated with either maximum heart rate or rate limiting temperatures among individuals. Annotation of significant loci provided candidate genes that underlie thermal adaptation, including pathways associated with cardiac function ( IRX 5, CASQ 1, CAC 1D, and TITIN ), neuroendocrine system ( GPR 17 and NOS ), and stress response ( SERPH ). By integrating comparative physiology and population genomics, results here advance our knowledge on evolutionary processes of thermal adaptation in aquatic ectotherms.
    Type of Medium: Online Resource
    ISSN: 1752-4571 , 1752-4571
    URL: Issue
    URL: Article
    DOI: 10.1111/eva.2018.11.issue-9
    DOI: 10.1111/eva.12672
    Language: English
    Publisher: Wiley
    Publication Date: 2018
    detail.hit.zdb_id: 2405496-3
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  • 6
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    Online Resource
    Applying genomics in assisted migration under climate change: Framework, empirical applications, and case studies
    Wiley ; 2022
    In:  Evolutionary Applications Vol. 15, No. 1 ( 2022-01), p. 3-21
    Details
    In: Evolutionary Applications, Wiley, Vol. 15, No. 1 ( 2022-01), p. 3-21
    Abstract: The rate of global climate change is projected to outpace the ability of many natural populations and species to adapt. Assisted migration (AM), which is defined as the managed movement of climate‐adapted individuals within or outside the species ranges, is a conservation option to improve species' adaptive capacity and facilitate persistence. Although conservation biologists have long been using genetic tools to increase or maintain diversity of natural populations, genomic techniques could add extra benefit in AM that include selectively neutral and adaptive regions of the genome. In this review, we first propose a framework along with detailed procedures to aid collaboration among scientists, agencies, and local and regional managers during the decision‐making process of genomics‐guided AM. We then summarize the genomic approaches for applying AM, followed by a literature search of existing incorporation of genomics in AM across taxa. Our literature search initially identified 729 publications, but after filtering returned only 50 empirical studies that were either directly applied or considered genomics in AM related to climate change across taxa of plants, terrestrial animals, and aquatic animals; 42 studies were in plants. This demonstrated limited application of genomic methods in AM in organisms other than plants, so we provide further case studies as two examples to demonstrate the negative impact of climate change on non‐model species and how genomics could be applied in AM. With the rapidly developing sequencing technology and accumulating genomic data, we expect to see more successful applications of genomics in AM, and more broadly, in the conservation of biodiversity.
    Type of Medium: Online Resource
    ISSN: 1752-4571 , 1752-4571
    URL: Issue
    URL: Article
    DOI: 10.1111/eva.v15.1
    DOI: 10.1111/eva.13335
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 2405496-3
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