Growth and Maturation of a Subarctic Fish Community Under a Changing Climate
Increasing water temperatures from novel climate change may alter freshwater fish life history strategies, especially those of fish populations in northern latitudes. Fish species life history strategies are reflected by their environments and increasing water temperature may alter the most favorabl...
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UiT Norges arktiske universitet
2021
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ftunivtroemsoe:oai:munin.uit.no:10037/21792 2023-05-15T14:30:09+02:00 Growth and Maturation of a Subarctic Fish Community Under a Changing Climate Stangeland, Atle Johannes Hætta 2021-06-15 https://hdl.handle.net/10037/21792 eng eng UiT Norges arktiske universitet UiT The Arctic University of Norway https://hdl.handle.net/10037/21792 openAccess Copyright 2021 The Author(s) Life history strategy Climate change Freshwater fish Lille Rostavatn VDP::Mathematics and natural science: 400::Zoology and botany: 480::Limnology: 498 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Limnologi: 498 BIO-3950 Master thesis Mastergradsoppgave 2021 ftunivtroemsoe 2021-07-07T22:52:38Z Increasing water temperatures from novel climate change may alter freshwater fish life history strategies, especially those of fish populations in northern latitudes. Fish species life history strategies are reflected by their environments and increasing water temperature may alter the most favorable strategies considering growth and reproductive patterns. In this study, life history traits of a fish community will be investigated to reveal any supposable climate change effects on life history strategies of a subarctic lake in northern Norway. Length, age, and maturity data from three periods of sampling over a 23-year period is used to model and compare changes over time of two life history traits: growth and age-and-size at maturation. The current lake has experienced a community-shift, with decreased relative contribution of the cold-water adapted species Arctic charr (Salvelinus alpinus) and burbot (Lota lota) and a corresponding increase of the cool-water adapted species brown trout (Salmo trutta) and grayling (Thymallus thymallus). At the same time, there has been a mean annual water temperature increase of 1 degree. The growth parameters, L∞ and Gi, are modelled with a modified von Bertalanffy equation. There was in increase in Gi for all species, except for Arctic charr, and an increase in L∞ for all species, except for the burbot during the period of study. These findings suggest that the fish species benefit somewhat of climate change, to this day. The calculated maturation patterns reveal decreased A50 and L50 for both cold-water adapted species, which could indicate a negative temperature effect. The effects of climate change on life history strategies are difficult to distinguish. As there are many factors affecting life history traits in a complex fish community in a heteromorphic lake. Climate change seems to affect life history traits both directly and indirectly through various mechanisms. Master Thesis Arctic charr Arctic Burbot Climate change Lota lota Northern Norway Salvelinus alpinus Subarctic lota University of Tromsø: Munin Open Research Archive Arctic Lille Rostavatn ENVELOPE(19.640,19.640,68.991,68.991) Norway |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
Life history strategy Climate change Freshwater fish Lille Rostavatn VDP::Mathematics and natural science: 400::Zoology and botany: 480::Limnology: 498 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Limnologi: 498 BIO-3950 |
spellingShingle |
Life history strategy Climate change Freshwater fish Lille Rostavatn VDP::Mathematics and natural science: 400::Zoology and botany: 480::Limnology: 498 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Limnologi: 498 BIO-3950 Stangeland, Atle Johannes Hætta Growth and Maturation of a Subarctic Fish Community Under a Changing Climate |
topic_facet |
Life history strategy Climate change Freshwater fish Lille Rostavatn VDP::Mathematics and natural science: 400::Zoology and botany: 480::Limnology: 498 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Limnologi: 498 BIO-3950 |
description |
Increasing water temperatures from novel climate change may alter freshwater fish life history strategies, especially those of fish populations in northern latitudes. Fish species life history strategies are reflected by their environments and increasing water temperature may alter the most favorable strategies considering growth and reproductive patterns. In this study, life history traits of a fish community will be investigated to reveal any supposable climate change effects on life history strategies of a subarctic lake in northern Norway. Length, age, and maturity data from three periods of sampling over a 23-year period is used to model and compare changes over time of two life history traits: growth and age-and-size at maturation. The current lake has experienced a community-shift, with decreased relative contribution of the cold-water adapted species Arctic charr (Salvelinus alpinus) and burbot (Lota lota) and a corresponding increase of the cool-water adapted species brown trout (Salmo trutta) and grayling (Thymallus thymallus). At the same time, there has been a mean annual water temperature increase of 1 degree. The growth parameters, L∞ and Gi, are modelled with a modified von Bertalanffy equation. There was in increase in Gi for all species, except for Arctic charr, and an increase in L∞ for all species, except for the burbot during the period of study. These findings suggest that the fish species benefit somewhat of climate change, to this day. The calculated maturation patterns reveal decreased A50 and L50 for both cold-water adapted species, which could indicate a negative temperature effect. The effects of climate change on life history strategies are difficult to distinguish. As there are many factors affecting life history traits in a complex fish community in a heteromorphic lake. Climate change seems to affect life history traits both directly and indirectly through various mechanisms. |
format |
Master Thesis |
author |
Stangeland, Atle Johannes Hætta |
author_facet |
Stangeland, Atle Johannes Hætta |
author_sort |
Stangeland, Atle Johannes Hætta |
title |
Growth and Maturation of a Subarctic Fish Community Under a Changing Climate |
title_short |
Growth and Maturation of a Subarctic Fish Community Under a Changing Climate |
title_full |
Growth and Maturation of a Subarctic Fish Community Under a Changing Climate |
title_fullStr |
Growth and Maturation of a Subarctic Fish Community Under a Changing Climate |
title_full_unstemmed |
Growth and Maturation of a Subarctic Fish Community Under a Changing Climate |
title_sort |
growth and maturation of a subarctic fish community under a changing climate |
publisher |
UiT Norges arktiske universitet |
publishDate |
2021 |
url |
https://hdl.handle.net/10037/21792 |
long_lat |
ENVELOPE(19.640,19.640,68.991,68.991) |
geographic |
Arctic Lille Rostavatn Norway |
geographic_facet |
Arctic Lille Rostavatn Norway |
genre |
Arctic charr Arctic Burbot Climate change Lota lota Northern Norway Salvelinus alpinus Subarctic lota |
genre_facet |
Arctic charr Arctic Burbot Climate change Lota lota Northern Norway Salvelinus alpinus Subarctic lota |
op_relation |
https://hdl.handle.net/10037/21792 |
op_rights |
openAccess Copyright 2021 The Author(s) |
_version_ |
1766304050586845184 |