The effects of habitat changes, conservation measures and interspecific interactions on forest-dwelling hawks
Human-caused habitat changes have led to declines of many species by impairing their occurrence, reproduction and interactions with other species. In Northern Europe, intensive forestry has transformed boreal forests and worsened conditions of species dependent on old forest, but the mechanisms by w...
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Helsingin yliopisto
2015
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/155074 2023-08-20T03:59:03+02:00 The effects of habitat changes, conservation measures and interspecific interactions on forest-dwelling hawks Elinympäristömuutosten, suojelutoimien ja lajien välisten vuorovaikutussuhteiden vaikutukset metsähaukkoihin Björklund, Heidi Krüger, Oliver University of Helsinki, Faculty of Biological and Environmental Sciences, Department of Biosciences, Ecology and Evolutionary Biology Finnish Museum of Natural History Luomus Helsingin yliopisto, bio- ja ympäristötieteellinen tiedekunta, biotieteiden laitos Helsingfors universitet, bio- och miljövetenskapliga fakulteten, biovetenskapliga institutionen Laaksonen, Toni Valkama, Jari 2015-06-05T06:07:56Z application/pdf http://hdl.handle.net/10138/155074 eng eng Helsingin yliopisto Helsingfors universitet University of Helsinki URN:ISBN:978-951-51-1369-6 Turku: University of Helsinki, 2015 http://hdl.handle.net/10138/155074 URN:ISBN:978-951-51-1370-2 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. Ecology Evolutionary Biology ekologia evoluutiobiologia Text Doctoral dissertation (article-based) Artikkeliväitöskirja Artikelavhandling doctoralThesis 2015 ftunivhelsihelda 2023-07-28T06:14:48Z Human-caused habitat changes have led to declines of many species by impairing their occurrence, reproduction and interactions with other species. In Northern Europe, intensive forestry has transformed boreal forests and worsened conditions of species dependent on old forest, but the mechanisms by which habitat changes affect species are often unknown. In my dissertation, I examined habitat changes, their effects and habitat-associated breeding performances of three declining forest-dwelling hawks, the northern goshawk (Accipiter gentilis), the common buzzard (Buteo buteo) and the honey buzzard (Pernis apivorus). These species can compete for nest sites and goshawks can also predate the buzzards. Raptors may lack nest sites in managed forests which is why their nesting has been supported by constructing artificial nests. I analysed the breeding success of the hawks in artificial nests since their benefits as a conservation measure were not previously analysed. Finally, I studied the conditions when dominant species can exclude subordinate ones in competition for suitable nest sites. According to my results, old forests have decreased and young forests increased throughout southern Finland. These changes are adverse for the goshawk whose breeding success improves when old spruce forests are more abundant and young forests scarce around their nests. Breeding performances of the common buzzard and honey buzzard were not significantly associated with habitats. However, common buzzards were reluctant to re-occupy nests surrounded by a vastness of old forest. The breeding success of the goshawk and common buzzard was lower in artificial nests than in natural ones. Thus, this measure aimed at enabling hawk breeding in managed forests seems to conflict with its conservation objectives. I discuss the possible contributing factors and directions for further investigations. Interspecific interactions with other raptors proved to be important when a subordinate hawk decided on territory occupancy. Common buzzards prefer to ... Doctoral or Postdoctoral Thesis Accipiter gentilis Northern Goshawk Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
institution |
Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
Ecology Evolutionary Biology ekologia evoluutiobiologia |
spellingShingle |
Ecology Evolutionary Biology ekologia evoluutiobiologia Björklund, Heidi The effects of habitat changes, conservation measures and interspecific interactions on forest-dwelling hawks |
topic_facet |
Ecology Evolutionary Biology ekologia evoluutiobiologia |
description |
Human-caused habitat changes have led to declines of many species by impairing their occurrence, reproduction and interactions with other species. In Northern Europe, intensive forestry has transformed boreal forests and worsened conditions of species dependent on old forest, but the mechanisms by which habitat changes affect species are often unknown. In my dissertation, I examined habitat changes, their effects and habitat-associated breeding performances of three declining forest-dwelling hawks, the northern goshawk (Accipiter gentilis), the common buzzard (Buteo buteo) and the honey buzzard (Pernis apivorus). These species can compete for nest sites and goshawks can also predate the buzzards. Raptors may lack nest sites in managed forests which is why their nesting has been supported by constructing artificial nests. I analysed the breeding success of the hawks in artificial nests since their benefits as a conservation measure were not previously analysed. Finally, I studied the conditions when dominant species can exclude subordinate ones in competition for suitable nest sites. According to my results, old forests have decreased and young forests increased throughout southern Finland. These changes are adverse for the goshawk whose breeding success improves when old spruce forests are more abundant and young forests scarce around their nests. Breeding performances of the common buzzard and honey buzzard were not significantly associated with habitats. However, common buzzards were reluctant to re-occupy nests surrounded by a vastness of old forest. The breeding success of the goshawk and common buzzard was lower in artificial nests than in natural ones. Thus, this measure aimed at enabling hawk breeding in managed forests seems to conflict with its conservation objectives. I discuss the possible contributing factors and directions for further investigations. Interspecific interactions with other raptors proved to be important when a subordinate hawk decided on territory occupancy. Common buzzards prefer to ... |
author2 |
Krüger, Oliver University of Helsinki, Faculty of Biological and Environmental Sciences, Department of Biosciences, Ecology and Evolutionary Biology Finnish Museum of Natural History Luomus Helsingin yliopisto, bio- ja ympäristötieteellinen tiedekunta, biotieteiden laitos Helsingfors universitet, bio- och miljövetenskapliga fakulteten, biovetenskapliga institutionen Laaksonen, Toni Valkama, Jari |
format |
Doctoral or Postdoctoral Thesis |
author |
Björklund, Heidi |
author_facet |
Björklund, Heidi |
author_sort |
Björklund, Heidi |
title |
The effects of habitat changes, conservation measures and interspecific interactions on forest-dwelling hawks |
title_short |
The effects of habitat changes, conservation measures and interspecific interactions on forest-dwelling hawks |
title_full |
The effects of habitat changes, conservation measures and interspecific interactions on forest-dwelling hawks |
title_fullStr |
The effects of habitat changes, conservation measures and interspecific interactions on forest-dwelling hawks |
title_full_unstemmed |
The effects of habitat changes, conservation measures and interspecific interactions on forest-dwelling hawks |
title_sort |
effects of habitat changes, conservation measures and interspecific interactions on forest-dwelling hawks |
publisher |
Helsingin yliopisto |
publishDate |
2015 |
url |
http://hdl.handle.net/10138/155074 |
genre |
Accipiter gentilis Northern Goshawk |
genre_facet |
Accipiter gentilis Northern Goshawk |
op_relation |
URN:ISBN:978-951-51-1369-6 Turku: University of Helsinki, 2015 http://hdl.handle.net/10138/155074 URN:ISBN:978-951-51-1370-2 |
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_ |
1774724914868125696 |