Life-history strategies in two subarctic lakes with polymorphic Arctic charr Salvelinus alpinus L. populations. High across lakes stability in evolution of life-history strategies
Life history strategies of polymorphic Arctic charr in two sub-arctic lakes (Tårnvatn and Skøvatn) with similar environmental- and physiochemical conditions were studied. Disparities in life history traits may reflect ecological adaptations and is suggested an important factor in the incipient speci...
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UiT Norges arktiske universitet
2018
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Online Access: | https://hdl.handle.net/10037/13546 |
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ftunivtroemsoe:oai:munin.uit.no:10037/13546 2023-05-15T14:30:00+02:00 Life-history strategies in two subarctic lakes with polymorphic Arctic charr Salvelinus alpinus L. populations. High across lakes stability in evolution of life-history strategies Kjær, Runar 2018-05-13 https://hdl.handle.net/10037/13546 eng eng UiT Norges arktiske universitet UiT The Arctic University of Norway https://hdl.handle.net/10037/13546 openAccess Copyright 2018 The Author(s) VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 BIO-3950 Master thesis Mastergradsoppgave 2018 ftunivtroemsoe 2021-06-25T17:56:03Z Life history strategies of polymorphic Arctic charr in two sub-arctic lakes (Tårnvatn and Skøvatn) with similar environmental- and physiochemical conditions were studied. Disparities in life history traits may reflect ecological adaptations and is suggested an important factor in the incipient speciation process. In this region several lakes have polymorphic charr, and the designation of a fish to a morph-group was based on external morphology verified through genetic differences. The trimorphic population in Tårnvatn has one littoral omnivore (LO), a small-sized profundal benthivore (PB), and a large-sized profundal piscivore (PP) morph. Skøvatn has in addition to the LO-morph, a novel profundal zooplanktivore morph (PZ). The PZ-morph closely resembles the PB-morph in terms of external morphology (cryptic coloration, large eye-size, blunt snout) and several life-history traits. Compared with their sympatric LO-morph, the PZ- and PB-morphs had an early age (4 and 5 years) and size (<100 mm and <110 mm) at sexual maturity, similar as in two other nearby lakes. The PP-morph resemble a higher age at maturity compared to the co-occurring LO-morph. Intra-lake morph comparisons revealed also distinct disparities regarding population growth parameters calculated with von Bertalanffys’ growth model. The different life-history trajectories regarding growth parameters and reproductive strategies between morph are reflected by divergent trophic niches. Thus, there are high across lakes stability in life-history traits among polymorphic Arctic charr populations occupying similar ecological niches in this region in northern Norway. Keywords: Life-history, polymorphism, parallel evolution, Arctic charr, Salvelinus alpinus Master Thesis Arctic charr Arctic Northern Norway Salvelinus alpinus Subarctic University of Tromsø: Munin Open Research Archive Arctic Norway |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 BIO-3950 |
spellingShingle |
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 BIO-3950 Kjær, Runar Life-history strategies in two subarctic lakes with polymorphic Arctic charr Salvelinus alpinus L. populations. High across lakes stability in evolution of life-history strategies |
topic_facet |
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 BIO-3950 |
description |
Life history strategies of polymorphic Arctic charr in two sub-arctic lakes (Tårnvatn and Skøvatn) with similar environmental- and physiochemical conditions were studied. Disparities in life history traits may reflect ecological adaptations and is suggested an important factor in the incipient speciation process. In this region several lakes have polymorphic charr, and the designation of a fish to a morph-group was based on external morphology verified through genetic differences. The trimorphic population in Tårnvatn has one littoral omnivore (LO), a small-sized profundal benthivore (PB), and a large-sized profundal piscivore (PP) morph. Skøvatn has in addition to the LO-morph, a novel profundal zooplanktivore morph (PZ). The PZ-morph closely resembles the PB-morph in terms of external morphology (cryptic coloration, large eye-size, blunt snout) and several life-history traits. Compared with their sympatric LO-morph, the PZ- and PB-morphs had an early age (4 and 5 years) and size (<100 mm and <110 mm) at sexual maturity, similar as in two other nearby lakes. The PP-morph resemble a higher age at maturity compared to the co-occurring LO-morph. Intra-lake morph comparisons revealed also distinct disparities regarding population growth parameters calculated with von Bertalanffys’ growth model. The different life-history trajectories regarding growth parameters and reproductive strategies between morph are reflected by divergent trophic niches. Thus, there are high across lakes stability in life-history traits among polymorphic Arctic charr populations occupying similar ecological niches in this region in northern Norway. Keywords: Life-history, polymorphism, parallel evolution, Arctic charr, Salvelinus alpinus |
format |
Master Thesis |
author |
Kjær, Runar |
author_facet |
Kjær, Runar |
author_sort |
Kjær, Runar |
title |
Life-history strategies in two subarctic lakes with polymorphic Arctic charr Salvelinus alpinus L. populations. High across lakes stability in evolution of life-history strategies |
title_short |
Life-history strategies in two subarctic lakes with polymorphic Arctic charr Salvelinus alpinus L. populations. High across lakes stability in evolution of life-history strategies |
title_full |
Life-history strategies in two subarctic lakes with polymorphic Arctic charr Salvelinus alpinus L. populations. High across lakes stability in evolution of life-history strategies |
title_fullStr |
Life-history strategies in two subarctic lakes with polymorphic Arctic charr Salvelinus alpinus L. populations. High across lakes stability in evolution of life-history strategies |
title_full_unstemmed |
Life-history strategies in two subarctic lakes with polymorphic Arctic charr Salvelinus alpinus L. populations. High across lakes stability in evolution of life-history strategies |
title_sort |
life-history strategies in two subarctic lakes with polymorphic arctic charr salvelinus alpinus l. populations. high across lakes stability in evolution of life-history strategies |
publisher |
UiT Norges arktiske universitet |
publishDate |
2018 |
url |
https://hdl.handle.net/10037/13546 |
geographic |
Arctic Norway |
geographic_facet |
Arctic Norway |
genre |
Arctic charr Arctic Northern Norway Salvelinus alpinus Subarctic |
genre_facet |
Arctic charr Arctic Northern Norway Salvelinus alpinus Subarctic |
op_relation |
https://hdl.handle.net/10037/13546 |
op_rights |
openAccess Copyright 2018 The Author(s) |
_version_ |
1766303932088320000 |