Change in growth and overall condition in populations of anadromous burbot (Lota lota) in the Gulf of Bothnia
Many populations of burbot (Lota lota)around the world have been extirpated, are endangered or are in serious decline both regarding numbers but also in size. The aim of this study was to investigate if growth and overall condition in populations of anadromous burbot in the Gulf of Bothnia has chang...
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Umeå universitet, Institutionen för ekologi, miljö och geovetenskap
2019
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ftumeauniv:oai:DiVA.org:umu-162934 2023-10-09T21:50:27+02:00 Change in growth and overall condition in populations of anadromous burbot (Lota lota) in the Gulf of Bothnia Alftberg Melin, Mattias 2019 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-162934 eng eng Umeå universitet, Institutionen för ekologi, miljö och geovetenskap http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-162934 info:eu-repo/semantics/openAccess Growth Burbot Temperature Age distribution Climate change Ecology Ekologi Student thesis info:eu-repo/semantics/bachelorThesis text 2019 ftumeauniv 2023-09-22T13:51:37Z Many populations of burbot (Lota lota)around the world have been extirpated, are endangered or are in serious decline both regarding numbers but also in size. The aim of this study was to investigate if growth and overall condition in populations of anadromous burbot in the Gulf of Bothnia has changed over time and if so, discuss potential causes behind. This was done by comparing size at age and individual level condition indices of the two populations of anadromous burbot in Sävarån and Rickleån to previous studies from the same rivers. The results showed thatgrowth of young burbot has increased between the time period 2001-2014 to 2019in Sävarånand also a change towards a higher frequency of young individuals and a lack of older ones. Furthermore, an increase over time in condition was observed in Sävarån. In Rickleån the growth at the age of 3 had increased from both 1969-1971 and 2001-2014 to 2019. At the age of 4 to 9 a decrease in growth was shown from the time period 1969-1971 to 2001-2014 in Rickleån. A shift towards warmer water temperatures due to climate change might be an explanation in the observed change in both growth and condition in the population of burbots in Sävarån and Rickleån. Furthermore, the observed change in age frequency in Sävarån could also be a result of an increase in water temperature but could also be an effect of restoration and the control of pH in Sävarån. Bachelor Thesis Burbot Lota lota lota Umeå University: Publications (DiVA) |
institution |
Open Polar |
collection |
Umeå University: Publications (DiVA) |
op_collection_id |
ftumeauniv |
language |
English |
topic |
Growth Burbot Temperature Age distribution Climate change Ecology Ekologi |
spellingShingle |
Growth Burbot Temperature Age distribution Climate change Ecology Ekologi Alftberg Melin, Mattias Change in growth and overall condition in populations of anadromous burbot (Lota lota) in the Gulf of Bothnia |
topic_facet |
Growth Burbot Temperature Age distribution Climate change Ecology Ekologi |
description |
Many populations of burbot (Lota lota)around the world have been extirpated, are endangered or are in serious decline both regarding numbers but also in size. The aim of this study was to investigate if growth and overall condition in populations of anadromous burbot in the Gulf of Bothnia has changed over time and if so, discuss potential causes behind. This was done by comparing size at age and individual level condition indices of the two populations of anadromous burbot in Sävarån and Rickleån to previous studies from the same rivers. The results showed thatgrowth of young burbot has increased between the time period 2001-2014 to 2019in Sävarånand also a change towards a higher frequency of young individuals and a lack of older ones. Furthermore, an increase over time in condition was observed in Sävarån. In Rickleån the growth at the age of 3 had increased from both 1969-1971 and 2001-2014 to 2019. At the age of 4 to 9 a decrease in growth was shown from the time period 1969-1971 to 2001-2014 in Rickleån. A shift towards warmer water temperatures due to climate change might be an explanation in the observed change in both growth and condition in the population of burbots in Sävarån and Rickleån. Furthermore, the observed change in age frequency in Sävarån could also be a result of an increase in water temperature but could also be an effect of restoration and the control of pH in Sävarån. |
format |
Bachelor Thesis |
author |
Alftberg Melin, Mattias |
author_facet |
Alftberg Melin, Mattias |
author_sort |
Alftberg Melin, Mattias |
title |
Change in growth and overall condition in populations of anadromous burbot (Lota lota) in the Gulf of Bothnia |
title_short |
Change in growth and overall condition in populations of anadromous burbot (Lota lota) in the Gulf of Bothnia |
title_full |
Change in growth and overall condition in populations of anadromous burbot (Lota lota) in the Gulf of Bothnia |
title_fullStr |
Change in growth and overall condition in populations of anadromous burbot (Lota lota) in the Gulf of Bothnia |
title_full_unstemmed |
Change in growth and overall condition in populations of anadromous burbot (Lota lota) in the Gulf of Bothnia |
title_sort |
change in growth and overall condition in populations of anadromous burbot (lota lota) in the gulf of bothnia |
publisher |
Umeå universitet, Institutionen för ekologi, miljö och geovetenskap |
publishDate |
2019 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-162934 |
genre |
Burbot Lota lota lota |
genre_facet |
Burbot Lota lota lota |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-162934 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1779313507021357056 |