Behavioural and physiological responses to predators of captive-bred Arctic charr : significance of genetics, learning and ontogeny
Predation forms one of the main selective forces in nature and in a vast number of prey species the behavioural responses form the main way to avoid predation. World wide numerous captive breeding programs are used to produce fish and other animal species for conservational reintroductions. However,...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/22237 2023-08-20T04:03:16+02:00 Behavioural and physiological responses to predators of captive-bred Arctic charr : significance of genetics, learning and ontogeny Laakkonen, Mika Petersson, Erik University of Helsinki, Faculty of Biosciences, Department of Biological and Environmental Sciences Helsingin yliopisto, biotieteellinen tiedekunta, bio- ja ympäristötieteiden laitos Helsingfors universitet, biovetenskapliga fakulteten, institutionen för bio- och miljövetenskaper Hirvonen, Heikki 2010-11-25T13:21:39Z application/pdf http://hdl.handle.net/10138/22237 eng eng Helsingin yliopisto Helsingfors universitet University of Helsinki URN:ISBN:978-952-92-2275-9 http://hdl.handle.net/10138/22237 URN:ISBN:978-952-10-4038-2 Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. käyttäytymisekologia Text Doctoral dissertation (article-based) Artikkeliväitöskirja Artikelavhandling doctoralThesis 2010 ftunivhelsihelda 2023-07-28T06:14:15Z Predation forms one of the main selective forces in nature and in a vast number of prey species the behavioural responses form the main way to avoid predation. World wide numerous captive breeding programs are used to produce fish and other animal species for conservational reintroductions. However, rearing animals in the absence of predators in captivity has been shown to weaken their predator avoidance skills and lead to behavioural divergence between wild and captive-bred populations. In my thesis I studied the effects of predator odour exposures on antipredator behavioural and physiological responses of captive reared Saimaa Arctic charr. This charr population is the most endangered fish population in Finland and a sample of the remaining population has been taken to captive breeding and used for an extensive reintroduction program. Lowered responsiveness to predators is probably one of the major reasons for the poor survival probability of the charr after release into the wild. The main aims of my thesis were to explore the reasons for behavioural phenotypic variation in this charr population and whether naïve charr young could be trained to recognise their natural predators. The predator species in my thesis were burbot (Lota lota) and pikeperch (Sander lucioperca). In my thesis I showed that the captive-bred charr responded to chemical cues from burbot and pikeperch, but the magnitude of responses was linked to the predator species. The burbot odour increased the spatial odour avoidance of the charr young. On the other hand, in the pikeperch treatment charr reduced their relative swimming activity and tended to show more freezing behaviour relative to the burbot treatment. It seems evident that these different responses are related to the different hunting tactics of predator species. Furthermore, I detected wide between-family differences in antipredator responsiveness (i.e. inherited variation in antipredator behaviours) in this captive stock. Detected differences were greater in the response towards ... Doctoral or Postdoctoral Thesis Arctic charr Arctic Burbot Lota lota lota Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto Arctic |
institution |
Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
käyttäytymisekologia |
spellingShingle |
käyttäytymisekologia Laakkonen, Mika Behavioural and physiological responses to predators of captive-bred Arctic charr : significance of genetics, learning and ontogeny |
topic_facet |
käyttäytymisekologia |
description |
Predation forms one of the main selective forces in nature and in a vast number of prey species the behavioural responses form the main way to avoid predation. World wide numerous captive breeding programs are used to produce fish and other animal species for conservational reintroductions. However, rearing animals in the absence of predators in captivity has been shown to weaken their predator avoidance skills and lead to behavioural divergence between wild and captive-bred populations. In my thesis I studied the effects of predator odour exposures on antipredator behavioural and physiological responses of captive reared Saimaa Arctic charr. This charr population is the most endangered fish population in Finland and a sample of the remaining population has been taken to captive breeding and used for an extensive reintroduction program. Lowered responsiveness to predators is probably one of the major reasons for the poor survival probability of the charr after release into the wild. The main aims of my thesis were to explore the reasons for behavioural phenotypic variation in this charr population and whether naïve charr young could be trained to recognise their natural predators. The predator species in my thesis were burbot (Lota lota) and pikeperch (Sander lucioperca). In my thesis I showed that the captive-bred charr responded to chemical cues from burbot and pikeperch, but the magnitude of responses was linked to the predator species. The burbot odour increased the spatial odour avoidance of the charr young. On the other hand, in the pikeperch treatment charr reduced their relative swimming activity and tended to show more freezing behaviour relative to the burbot treatment. It seems evident that these different responses are related to the different hunting tactics of predator species. Furthermore, I detected wide between-family differences in antipredator responsiveness (i.e. inherited variation in antipredator behaviours) in this captive stock. Detected differences were greater in the response towards ... |
author2 |
Petersson, Erik University of Helsinki, Faculty of Biosciences, Department of Biological and Environmental Sciences Helsingin yliopisto, biotieteellinen tiedekunta, bio- ja ympäristötieteiden laitos Helsingfors universitet, biovetenskapliga fakulteten, institutionen för bio- och miljövetenskaper Hirvonen, Heikki |
format |
Doctoral or Postdoctoral Thesis |
author |
Laakkonen, Mika |
author_facet |
Laakkonen, Mika |
author_sort |
Laakkonen, Mika |
title |
Behavioural and physiological responses to predators of captive-bred Arctic charr : significance of genetics, learning and ontogeny |
title_short |
Behavioural and physiological responses to predators of captive-bred Arctic charr : significance of genetics, learning and ontogeny |
title_full |
Behavioural and physiological responses to predators of captive-bred Arctic charr : significance of genetics, learning and ontogeny |
title_fullStr |
Behavioural and physiological responses to predators of captive-bred Arctic charr : significance of genetics, learning and ontogeny |
title_full_unstemmed |
Behavioural and physiological responses to predators of captive-bred Arctic charr : significance of genetics, learning and ontogeny |
title_sort |
behavioural and physiological responses to predators of captive-bred arctic charr : significance of genetics, learning and ontogeny |
publisher |
Helsingin yliopisto |
publishDate |
2010 |
url |
http://hdl.handle.net/10138/22237 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic charr Arctic Burbot Lota lota lota |
genre_facet |
Arctic charr Arctic Burbot Lota lota lota |
op_relation |
URN:ISBN:978-952-92-2275-9 http://hdl.handle.net/10138/22237 URN:ISBN:978-952-10-4038-2 |
op_rights |
Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. |
_version_ |
1774713658938490880 |