"Andif you gaze long into an abyss, the abyss gazes also into thee ": four morphs of Arctic charr adapting to a depth gradient in Lake Tinnsjøen

Evolutionary Applications
K ØstbyeKim Præbel

Abstract

The origin of species is a central topic in biology. Ecological speciation might be a driver in adaptive radiation, providing a framework for understanding mechanisms, level, and rate of diversification. The Arctic charr Salvelinus alpinus L. is a polymorphic species with huge morphological and life-history diversity in Holarctic water systems. We studied adaptive radiation of Arctic charr in the 460-m-deep Lake Tinnsjøen to (a) document eco-morphology and life-history traits of morphs, (b) estimate reproductive isolation of morphs, and (c) illuminate Holarctic phylogeography and lineages colonizing Lake Tinnsjøen. We compared Lake Tinnsjøen with four Norwegian outgroup populations. Four field-assigned morphs were identified in Lake Tinnsjøen: the planktivore morph in all habitats except deep profundal, the dwarf morph in shallow-moderate profundal, the piscivore morph mainly in shallow-moderate profundal, and a new undescribed abyssal morph in the deep profundal. Morphs displayed extensive life-history variation in age and size. A moderate-to-high concordance was observed among morphs and four genetic clusters from microsatellites. mtDNA suggested two minor endemic clades in Lake Tinnsjøen originating from one widespread colon...Continue Reading

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Citations

Jun 22, 2021·Molecular Ecology·Tony KessIan R Bradbury

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Datasets Mentioned

BETA
LT617532.1

Methods Mentioned

BETA
electrophoresis
PCR
PCA

Software Mentioned

MICRO
MorphoJ
STRUCTURE
BLAST
Genetix
RARE
STRUCTURE HARVESTER
TpsDig2
JMP
Geneious

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