scholarly journals Chromosomal fusion and life history‐associated genomic variation contribute to within‐river local adaptation of Atlantic salmon

2018 ◽  
Vol 28 (6) ◽  
pp. 1439-1459 ◽  
Author(s):  
Kyle Wellband ◽  
Claire Mérot ◽  
Tommi Linnansaari ◽  
J. A. K. Elliott ◽  
R. Allen Curry ◽  
...  
Keyword(s):  
Life History ◽  
Atlantic Salmon ◽  
Local Adaptation ◽  
Genomic Variation

scholarly journals Chromosomal fusion and life history-associated genomic variation contribute to within-river local adaptation of Atlantic salmon

2018 ◽  
Author(s):  
Kyle Wellband ◽  
Claire Mérot ◽  
Tommi Linnansaari ◽  
J. A. K. Elliott ◽  
R. Allen Curry ◽  
...  
Keyword(s):  
Population Structure ◽  
Atlantic Salmon ◽  
Local Adaptation ◽  
Spatial Scales ◽  
Genetic Relationships ◽  
Snp Array ◽  
Summer Precipitation ◽  
Genomic Variation ◽  
Chromosome 9 ◽  
Adaptive Processes

AbstractChromosomal inversions have been implicated in facilitating adaptation in the face of high levels of gene flow, but whether chromosomal fusions also have similar potential remains poorly understood. Atlantic salmon are usually characterized by population structure at multiple spatial scales; however, this is not the case for tributaries of the Miramichi River in North America. To resolve genetic relationships between populations in this system and the potential for known chromosomal fusions to contribute to adaptation we genotyped 728 juvenile salmon using a 50K SNP array. Consistent with previous work, we report extremely weak overall population structuring (Global FST = 0.004) and failed to support hierarchical structure between the river’s two main branches. We provide the first genomic characterization of a previously described polymorphic fusion between chromosomes 8 and 29. Fusion genomic characteristics included high LD, reduced heterozygosity in the fused homokaryotes, and strong divergence between the fused and the unfused rearrangement. Population structure based on fusion karyotype was five times stronger than neutral variation (FST = 0.019) and the frequency of the fusion was associated with summer precipitation supporting a hypothesis that this rearrangement may contribute local adaptation despite weak neutral differentiation. Additionally, both outlier variation among populations and a polygenic framework for characterizing adaptive variation in relation to climate identified a 250 Kb region of chromosome 9, including the gene six6 that has previously been linked to age-at-maturity and run-timing for this species. Overall our results indicate that adaptive processes, independent of major river branching, are more important than neutral processes for structuring these populations.

Effect of time of day, time of year, and life history strategy on time budgeting in juvenile Atlantic salmon, Salmo salar

1999 ◽  
Vol 56 (12) ◽  
pp. 2397-2403 ◽  
Author(s):  
Sveinn K Valdimarsson ◽  
Neil B Metcalfe
Keyword(s):  
Life History ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Life History Strategy ◽  
Time Of Day ◽  
Life History Strategies ◽  
Foraging Efficiency ◽  
Atlantic Salmon Salmo Salar ◽  
Juvenile Atlantic Salmon ◽  
Time Of Year

Traditionally, behavioural studies on juvenile Atlantic salmon, Salmo salar, have been conducted during the day in summer. It is known that Atlantic salmon become nocturnal in winter, but very little is known about their behaviour at that time. Therefore, observations in a seminatural stream were carried out during the day and night, from February to June, comparing diel and seasonal differences in behaviour between fish adopting alternative life history strategies. The results showed a general trend for more activity in spring than in winter, and the fish were found to be foraging at surprisingly low light levels. There were differences in relative feeding rate between the life history strategies; the early migrant fish foraged mostly during the day whereas the delayed migrant fish did more foraging at night. There is some evidence that the early migrant fish made fewer feeding attempts over the winter, which is surprising, since they grow faster over that period. This suggests differences in foraging efficiency, which could contribute to the separation into these two life history strategies.

scholarly journals Intraspecific genomic variation and local adaptation in a young hybrid species

2019 ◽  
Author(s):  
Angélica Cuevas ◽  
Mark Ravinet ◽  
Glenn-Peter Sætre ◽  
Fabrice Eroukhmanoff
Keyword(s):  
Genetic Variation ◽  
Local Adaptation ◽  
Climatic Variation ◽  
Genomic Variation ◽  
Population Divergence ◽  
Parent Species ◽  
Evolutionary Potential ◽  
Variable Environment ◽  
Hybrid Species ◽  
Species Population

ABSTRACTHybridization increases genetic variation, hence hybrid species may have a strong evolutionary potential once their admixed genomes have stabilized and incompatibilities have been purged. Yet, little is known about how such hybrid lineages evolve at the genomic level following their formation, in particular the characteristics of their adaptive potential, i.e. constraints and facilitations of diversification. Here we investigate how the Italian sparrow (Passer italiae), a homoploid hybrid species, has evolved and locally adapted to its variable environment. Using restriction site-associated DNA sequencing (RAD-seq) on several populations across the Italian peninsula, we evaluate how genomic constraints and novel genetic variation have influenced population divergence and adaptation. We show that population divergence within this hybrid species has evolved in response to climatic variation. As in non-hybrid species, climatic differences may even reduce gene flow between populations, suggesting ongoing local adaptation. We report outlier genes associated with adaptation to climatic variation, known to be involved in beak morphology in other species. Most of the strongly divergent loci among Italian sparrow populations seem not to be differentiated between its parent species, the house and Spanish sparrow. Within the parental species, population divergence has occurred mostly in loci where different alleles segregate in the parent species, unlike in the hybrid, suggesting that novel combinations of parental alleles in the hybrid have not necessarily enhanced its evolutionary potential. Rather, our study suggests that constraints linked to incompatibilities may have restricted the evolution of this admixed genome, both during and after hybrid species formation.

scholarly journals Genomic variation associated with local adaptation of weedy rice during de-domestication

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Jie Qiu ◽  
Yongjun Zhou ◽  
Lingfeng Mao ◽  
Chuyu Ye ◽  
Weidi Wang ◽  
...  
Keyword(s):  
Local Adaptation ◽  
Genomic Variation ◽  
Weedy Rice

Gene flow from domesticated escapes alters the life history of wild Atlantic salmon

2017 ◽  
Vol 1 (5) ◽  
Author(s):  
Geir H. Bolstad ◽  
Kjetil Hindar ◽  
Grethe Robertsen ◽  
Bror Jonsson ◽  
Harald Sægrov ◽  
...  
Keyword(s):  
Life History ◽  
Gene Flow ◽  
Atlantic Salmon ◽  
History Of

scholarly journals Intraspecific genomic variation and local adaptation in a young hybrid species

2020 ◽  
Author(s):  
Angélica Cuevas ◽  
Mark Ravinet ◽  
Glenn‐Peter Sætre ◽  
Fabrice Eroukhmanoff
Keyword(s):  
Local Adaptation ◽  
Genomic Variation ◽  
Hybrid Species

scholarly journals Time spent in distinct life history stages has sex‐specific effects on reproductive fitness in wild Atlantic salmon

2020 ◽  
Vol 29 (6) ◽  
pp. 1173-1184 ◽  
Author(s):  
Kenyon B. Mobley ◽  
Hanna Granroth‐Wilding ◽  
Mikko Ellmén ◽  
Panu Orell ◽  
Jaakko Erkinaro ◽  
...  
Keyword(s):  
Life History ◽  
Atlantic Salmon ◽  
Reproductive Fitness ◽  
Life History Stages ◽  
Specific Effects

Life history changes in Atlantic salmon from the River Dee, Wales

2008 ◽  
pp. 61-78
Author(s):  
Miran W. Aprahamian ◽  
Ian C. Davidson ◽  
Richard J. Cove
Keyword(s):  
Life History ◽  
Atlantic Salmon

Life history dependent morphometric variation in stream-dwelling Atlantic salmon

Oecologia ◽  
2003 ◽  
Vol 137 (4) ◽  
pp. 533-540 ◽  
Author(s):  
Benjamin H. Letcher
Keyword(s):  
Life History ◽  
Atlantic Salmon ◽  
Morphometric Variation
Sign in / Sign up

Export Citation Format

Share Document