Conservation prioritization in widespread species: the use of genetic and morphological data to assess population distinctiveness in rainbow trout (<i>Oncorhynchus mykiss</i>
) from British Columbia, Canada

Taylor, Eric B.; Tamkee, Patrick; Keeley, Ernest R.; Parkinson, Eric A.

doi:10.1111/j.1752-4571.2010.00136.x

Cited by 44 publications

(46 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Conservation decisions may be particularly complicated when official taxonomy, in particular at the sub-specific level, lacks correspondence with phenotypic variation across a wide area (Taylor et al 2011;Yannic et al 2014). In North America, outdated taxonomy and taxonomic debate have Electronic supplementary material The online version of this article (doi:10.1007/s10592-015-0759-4) contains supplementary material, which is available to authorized users.…”

Section: Introductionmentioning

confidence: 99%

Morphological and genetic variation in Cisco (Coregonus artedi) and Shortjaw Cisco (C. zenithicus): multiple origins of Shortjaw Cisco in inland lakes require a lake-specific conservation approach

et al. 2015

View full text Add to dashboard Cite

The study of cisco diversity in inland lakes of North America has been plagued by taxonomic uncertainty linked to high phenotypic plasticity and an ongoing reliance on morphology to differentiate species. More recently, this uncertainty has hindered the development of conservation plans and status assessments of ciscoes. This study presents the first range-wide comparison of morphological and genetic variation between Cisco (Coregonus artedi) and Shortjaw Cisco (C. zenithicus). Using morphological and genetic data from 17 lakes, three sets of analyses were undertaken to evaluate alternate hypotheses explaining the pattern of cisco phenotypic diversity in inland lakes. Morphotypes (MTs) representing the two taxa were phenotypically distinct (largely reflective of differences in gill raker number and jaw morphology) within lakes but highly variable across lakes. Shortjaw Cisco was only recognizable when compared to sympatric Cisco and some populations were morphologically similar to Cisco from other lakes. Analysis of AFLP data revealed two genetic clusters that conformed to differences in geography (eastern and western groups), rather than hypothesized taxonomic boundaries. Genetic variation strongly suggests that each of these unique sympatric pairs of MTs originated recently and locally, in parallel, from the ancestral Cisco. Phenotypic and genetic distinctiveness between MTs were not related. MTs were sometimes clearly recognizable despite a lack of genetic differentiation, suggesting that the canalization of phenotypic plasticity is unevenly completed across lakes. These results provide evidence that the taxonbased approach is clearly inadequate for the protection of Shortjaw Cisco. In Canada, status assessment should aim to identify lake-specific designatable units (DU). Given the idiosyncratic nature of each instance of Shortjaw Cisco, it is expected that the strength of morphological, biological, ecological and genetic evidence for individual DUs will vary among lakes.

show abstract

Section: Introductionmentioning

confidence: 99%

Morphological and genetic variation in Cisco (Coregonus artedi) and Shortjaw Cisco (C. zenithicus): multiple origins of Shortjaw Cisco in inland lakes require a lake-specific conservation approach

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Quantifying the extent and scale of LA is also increasingly important to the definition and application of conservation units within species for legal protection, including 'distinct population segments' under the US Endangered Species Act (Waples, 1991) and 'designatable units' under Canada's Species at Risk Act (Green, 2005). Even in the absence of formal legal recognition of intraspecific conservation units, a consideration of the scale and extent of LA can be important in proactive conservation prioritization (Taylor et al, 2011) or in restoration programs (Ricker, 1972;Hendry et al, 2003). Indeed, the failure of many restoration programs within the native ranges of Pacific salmon has been suggested to partly result from inadequate adaptive 'matching' of translocated populations to their new environments (Allendorf and Waples, 1996).…”

Section: Introductionmentioning

confidence: 99%

Extent and scale of local adaptation in salmonid fishes: review and meta-analysis

et al. 2011

View full text Add to dashboard Cite

What is the extent and scale of local adaptation (LA)? How quickly does LA arise? And what is its underlying molecular basis? Our review and meta-analysis on salmonid fishes estimates the frequency of LA to be B55-70%, with local populations having a 1.2 times average fitness advantage relative to foreign populations or to their performance in new environments. Salmonid LA is evident at a variety of spatial scales (for example, few km to41000 km) and can manifest itself quickly (6-30 generations). As the geographic scale between populations increases, LA is generally more frequent and stronger. Yet the extent of LA in salmonids does not appear to differ from that in other assessed taxa. Moreover, the frequency with which foreign salmonid populations outperform local populations (B23-35%) suggests that drift, gene flow and plasticity often limit or mediate LA. The relatively few studies based on candidate gene and genomewide analyses have identified footprints of selection at both small and large geographical scales, likely reflecting the specific functional properties of loci and the associated selection regimes (for example, local niche partitioning, pathogens, parasites, photoperiodicity and seasonal timing). The molecular basis of LA in salmonids is still largely unknown, but differential expression at the same few genes is implicated in the convergent evolution of certain phenotypes. Collectively, future research will benefit from an integration of classical and molecular approaches to understand: (i) species differences and how they originate, (ii) variation in adaptation across scales, life stages, population sizes and environmental gradients, and (iii) evolutionary responses to human activities.

show abstract

“…2010; Taylor et al. 2011). Understanding how species adapt and persist in postglacial landscapes depends on an understanding of the specific traits involved in trade‐offs across a gradient in winter duration.…”

Section: Discussionmentioning

confidence: 99%

“…2005, 2007; Taylor et al. 2011). However, the extent to which the persistence of rainbow trout populations across a gradient in winter duration is related to variation in energy allocation strategies and/or bioenergetic trade‐offs is unknown, as is the extent to which variation in life‐history traits (e.g., growth, energy storage, foraging rate, metabolic rate) across this gradient may be attributed to differences between particular strains or genotypes.…”

Section: Introductionmentioning

confidence: 99%

Rainbow trout in seasonal environments: phenotypic trade‐offs across a gradient in winter duration

Lea

Mee

Rogers

et al. 2015

Ecology and Evolution

View full text Add to dashboard Cite

Survival through periods of resource scarcity depends on the balance between metabolic demands and energy storage. The opposing effects of predation and starvation mortality are predicted to result in trade‐offs between traits that optimize fitness during periods of resource plenty (e.g., during the growing season) and those that optimize fitness during periods of resource scarcity (e.g., during the winter). We conducted a common environment experiment with two genetically distinct strains of rainbow trout to investigate trade‐offs due to (1) the balance of growth and predation risk related to foraging rate during the growing season and (2) the allocation of energy to body size prior to the winter. Fry (age 0) from both strains were stocked into replicate natural lakes at low and high elevation that differed in winter duration (i.e., ice cover) by 59 days. Overwinter survival was lowest in the high‐elevation lakes for both strains. Activity rate and growth rate were highest at high elevation, but growing season survival did not differ between strains or between environments. Hence, we did not observe a trade‐off between growth and predation risk related to foraging rate. Growth rate also differed significantly between the strains across both environments, which suggests that growth rate is involved in local adaptation. There was not, however, a difference between strains or between environments in energy storage. Hence, we did not observe a trade‐off between growth and storage. Our findings suggest that intrinsic metabolic rate, which affects a trade‐off between growth rate and overwinter survival, may influence local adaptation in organisms that experience particularly harsh winter conditions (e.g., extended periods trapped beneath the ice in high‐elevation lakes) in some parts of their range.

show abstract

Conservation prioritization in widespread species: the use of genetic and morphological data to assess population distinctiveness in rainbow trout (Oncorhynchus mykiss ) from British Columbia, Canada

Cited by 44 publications

References 62 publications

Morphological and genetic variation in Cisco (Coregonus artedi) and Shortjaw Cisco (C. zenithicus): multiple origins of Shortjaw Cisco in inland lakes require a lake-specific conservation approach

Morphological and genetic variation in Cisco (Coregonus artedi) and Shortjaw Cisco (C. zenithicus): multiple origins of Shortjaw Cisco in inland lakes require a lake-specific conservation approach

Extent and scale of local adaptation in salmonid fishes: review and meta-analysis

Rainbow trout in seasonal environments: phenotypic trade‐offs across a gradient in winter duration

Contact Info

Product

Resources

About