Search results for "ecological divergence"

showing 3 items of 3 documents

Introduction of Mysis relicta (Mysida) reduces niche segregation between deep-water Arctic charr morphs

2019

This is a post-peer-review, pre-copyedit version of an article published in Hydrobiologia. The final authenticated version is available online at https://doi.org/10.1007/s10750-019-3953-4. Niche diversification of polymorphic Arctic charr can be altered by multiple anthropogenic stressors. The opossum-shrimp (Mysis relicta) was introduced to compensate for reduced food resources for fish following hydropower operations in Lake Limingen, central Norway. Based on habitat use, stomach contents, stable isotopes (δ13C, δ15N) and trophically transmitted parasites, the zooplanktivorous upper water-column dwelling ‘normal’ morph was clearly trophically separated from two sympatric deep-water morphs…

0106 biological sciencesHydrobiologiaanimal structuresgenetic structuresMysis relictaistutus (eläimet)stable isotopes:Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 [VDP]Aquatic Science010603 evolutionary biology01 natural sciencesZooplanktonäyriäisetpolymorphismnieriäeriytyminenhydropower effectsloisetVDP::Mathematics and natural scienses: 400::Zoology and botany: 48014. Life underwaterspecies introductionsecological divergencereproductive and urinary physiologySalvelinus alpinusbiologyEcology010604 marine biology & hydrobiologyfungiNiche segregationPlanktonbiology.organism_classificationDeep waterekologinen lokeroMysidaArcticVDP::Matematikk og naturvitenskap: 400::Zoologiske og botaniske fag: 480parasite communitypsychological phenomena and processes
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Adaptation to Low Salinity Promotes Genomic Divergence in Atlantic Cod (Gadus morhua L.).

2015

How genomic selection enables species to adapt to divergent environments is a fundamental question in ecology and evolution. We investigated the genomic signatures of local adaptation in Atlantic cod (Gadus morhua L.) along a natural salinity gradient, ranging from 35‰ in the North Sea to 7‰ within the Baltic Sea. By utilizing a 12 K SNPchip, we simultaneously assessed neutral and adaptive genetic divergence across the Atlantic cod genome. Combining outlier analyses with a landscape genomic approach, we identified a set of directionally selected loci that are strongly correlated with habitat differences in salinity, oxygen, and temperature. Our results show that discrete regions within the …

SalinityGenomeBaltic Seapopulation genomicsgenomic adaptationGenomicsAdaptation PhysiologicalPolymorphism Single NucleotideLinkage DisequilibriumGadus morhuaGenesspeciationAtlantic codAnimalsSelection Geneticecological divergenceResearch ArticleSNPsGenome biology and evolution
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Data from: Trans-oceanic genomic divergence of Atlantic cod ecotypes is associated with large inversions

2017

Chromosomal rearrangements such as inversions can play a crucial role in maintaining polymorphism underlying complex traits and contribute to the process of speciation. In Atlantic cod (Gadus morhua), inversions of several megabases have been identified that dominate genomic differentiation between migratory and non-migratory ecotypes in the Northeast Atlantic. Here, we show that the same genomic regions display elevated divergence and contribute to ecotype divergence in the Northwest Atlantic as well. The occurrence of these inversions on both sides of the Atlantic Ocean reveals a common evolutionary origin, predating the more than 100,000 years old trans-Atlantic separation of Atlantic co…

medicine and health careGenomic adaptationInversion polymorphismLife SciencesMedicineChromosomal rearrangementecological divergenceSNPs
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