Contrasting patterns in trophic niche evolution of polymorphic Arctic charr populations in two subarctic Norwegian lakes
| Autor: | Kim Præbel, Anna Siwertsson, Per-Arne Amundsen, Michael Power, Paolo Maria Moccetti, Rune Knudsen, Runar Kjær, Ana-Maria Peris Tamayo |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Hydrobiologia VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 Salvelinus alpinus Ecology 010604 marine biology & hydrobiology Ecology (disciplines) Stable isotope analyses Genetic differences Stomach contents Norwegian Aquatic Science 010603 evolutionary biology 01 natural sciences Subarctic climate language.human_language VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 Geography Arctic Trophically transmitted parasites language Polymorphism Trophic niche Trophic niche divergence VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 |
| Zdroj: | Hydrobiologia |
| Popis: | 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/s10750-019-3969-9. Parallelism in trophic niches of polymorphic populations of Arctic charr was investigated in two similar subarctic lakes, Tårnvatn and Skøvatn, in northern Norway. Analysis of eleven microsatellite loci confirmed, respectively, the existence of three and two genetically differentiated morphs. Three methods were used to describe their trophic niches: habitat choice and stomach contents for the recent feeding behaviour, and trophically transmitted parasites and stable isotopes (δ13C and δ15N) as proxies for the longer term trophic niche differences. The results showed a distinct segregation in trophic resource utilization of the different morphs. Tårnvatn has three morphs: a littoral omnivorous (LO), a small-sized profundal benthivorous (PB), and a large-sized profundal piscivorous (PP). In contrast, a novel Arctic charr morph was discovered in Skøvatn: a small-sized profundal zooplanktivorous-morph (PZ), which when compared to the sympatric LO-morph, had distinct stable isotope values and a contrasting parasite community. A parallelism in habitat choice and external morphology was found among the small-sized, deep-water morphs and between the upper-water, omnivorous LO-morphs in both lakes. There was a no parallel pattern in diet choice between the PB- and the PZ-morphs. These findings show how evolution can produce diverse outcomes, even among systems with apparently similar environmental and ecological conditions. |
| Databáze: | OpenAIRE |
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