Breeding performance of the Fieldfare Turdus pilaris in the subalpine birch zone in southern Lapland: a 20 year study
A Fieldfare population, on average c. 160 pairs, was studied in subalpine birch forest in southern Lapland (c. 66°N; 500–600 m.a.s.l.) in 1983–2002. Onset of egg-laying showed no temporal trend, consistent with absence of spring temperature trend. Eggs were laid with an interval of c. 21 hours and 4...
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ftunivlundojs:oai:journals.lub.lu.se:article/22679 2023-05-15T17:06:59+02:00 Breeding performance of the Fieldfare Turdus pilaris in the subalpine birch zone in southern Lapland: a 20 year study Björktrastens Turdus pilaris häckning i den subalpina björkzonen i södra Lappland: en 20-årig studie Arheimer, Ola Svensson, Sören 2008-01-01 application/pdf https://journals.lub.lu.se/os/article/view/22679 https://doi.org/10.34080/os.v18.22679 eng eng BirdLife Sweden https://journals.lub.lu.se/os/article/view/22679/20174 https://journals.lub.lu.se/os/article/view/22679 doi:10.34080/os.v18.22679 Copyright (c) 2008 Ola Arheimer, Sören Svensson Ornis Svecica; Vol. 18 No. 1 (2008); 17-44 Ornis Svecica; Vol 18 Nr 1 (2008); 17-44 2003-2633 1102-6812 breeding biology egg-laying time breeding success population studies population demographics predator-prey interaction häckningsframgång äggläggningstid predator-byte interaktion häckningsbiologi populationsstudier populationsdemografi interaktion mellan predator och byte info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Research Paper text Fackgranskad uppsats 2008 ftunivlundojs https://doi.org/10.34080/os.v18.22679 2023-03-08T23:27:59Z A Fieldfare population, on average c. 160 pairs, was studied in subalpine birch forest in southern Lapland (c. 66°N; 500–600 m.a.s.l.) in 1983–2002. Onset of egg-laying showed no temporal trend, consistent with absence of spring temperature trend. Eggs were laid with an interval of c. 21 hours and 45 minutes, not 24 hours as normal in passerines. This reduces the exposure time to depredation during egg-laying with 9%. Egg hatchability was 96%. Egg parasitism never occurred. Depredation of nests was 46%, but very variable. Replacement and second clutches did not occur. Although an average of 4.45 young fledged from successful nests (≥1 fledgling), only 2.11 fledglings were produced per pair and year. The population varied without trend over the study period. Adult survival, estimated by the proportion of adults at the start of breeding, was 58%. This infers that first year survival must be at least c. 40%. Since this is a likely value, it seems that the Fieldfare population of the subalpine birch forest is selfsustained and not dependent upon immigration. Article in Journal/Newspaper Lappland Lapland Open Journals at Lund University (OJLU) Lappland ENVELOPE(18.067,18.067,65.900,65.900) Ornis Svecica 18 1 17 44 |
institution |
Open Polar |
collection |
Open Journals at Lund University (OJLU) |
op_collection_id |
ftunivlundojs |
language |
English |
topic |
breeding biology egg-laying time breeding success population studies population demographics predator-prey interaction häckningsframgång äggläggningstid predator-byte interaktion häckningsbiologi populationsstudier populationsdemografi interaktion mellan predator och byte |
spellingShingle |
breeding biology egg-laying time breeding success population studies population demographics predator-prey interaction häckningsframgång äggläggningstid predator-byte interaktion häckningsbiologi populationsstudier populationsdemografi interaktion mellan predator och byte Arheimer, Ola Svensson, Sören Breeding performance of the Fieldfare Turdus pilaris in the subalpine birch zone in southern Lapland: a 20 year study |
topic_facet |
breeding biology egg-laying time breeding success population studies population demographics predator-prey interaction häckningsframgång äggläggningstid predator-byte interaktion häckningsbiologi populationsstudier populationsdemografi interaktion mellan predator och byte |
description |
A Fieldfare population, on average c. 160 pairs, was studied in subalpine birch forest in southern Lapland (c. 66°N; 500–600 m.a.s.l.) in 1983–2002. Onset of egg-laying showed no temporal trend, consistent with absence of spring temperature trend. Eggs were laid with an interval of c. 21 hours and 45 minutes, not 24 hours as normal in passerines. This reduces the exposure time to depredation during egg-laying with 9%. Egg hatchability was 96%. Egg parasitism never occurred. Depredation of nests was 46%, but very variable. Replacement and second clutches did not occur. Although an average of 4.45 young fledged from successful nests (≥1 fledgling), only 2.11 fledglings were produced per pair and year. The population varied without trend over the study period. Adult survival, estimated by the proportion of adults at the start of breeding, was 58%. This infers that first year survival must be at least c. 40%. Since this is a likely value, it seems that the Fieldfare population of the subalpine birch forest is selfsustained and not dependent upon immigration. |
format |
Article in Journal/Newspaper |
author |
Arheimer, Ola Svensson, Sören |
author_facet |
Arheimer, Ola Svensson, Sören |
author_sort |
Arheimer, Ola |
title |
Breeding performance of the Fieldfare Turdus pilaris in the subalpine birch zone in southern Lapland: a 20 year study |
title_short |
Breeding performance of the Fieldfare Turdus pilaris in the subalpine birch zone in southern Lapland: a 20 year study |
title_full |
Breeding performance of the Fieldfare Turdus pilaris in the subalpine birch zone in southern Lapland: a 20 year study |
title_fullStr |
Breeding performance of the Fieldfare Turdus pilaris in the subalpine birch zone in southern Lapland: a 20 year study |
title_full_unstemmed |
Breeding performance of the Fieldfare Turdus pilaris in the subalpine birch zone in southern Lapland: a 20 year study |
title_sort |
breeding performance of the fieldfare turdus pilaris in the subalpine birch zone in southern lapland: a 20 year study |
publisher |
BirdLife Sweden |
publishDate |
2008 |
url |
https://journals.lub.lu.se/os/article/view/22679 https://doi.org/10.34080/os.v18.22679 |
long_lat |
ENVELOPE(18.067,18.067,65.900,65.900) |
geographic |
Lappland |
geographic_facet |
Lappland |
genre |
Lappland Lapland |
genre_facet |
Lappland Lapland |
op_source |
Ornis Svecica; Vol. 18 No. 1 (2008); 17-44 Ornis Svecica; Vol 18 Nr 1 (2008); 17-44 2003-2633 1102-6812 |
op_relation |
https://journals.lub.lu.se/os/article/view/22679/20174 https://journals.lub.lu.se/os/article/view/22679 doi:10.34080/os.v18.22679 |
op_rights |
Copyright (c) 2008 Ola Arheimer, Sören Svensson |
op_doi |
https://doi.org/10.34080/os.v18.22679 |
container_title |
Ornis Svecica |
container_volume |
18 |
container_issue |
1 |
container_start_page |
17 |
op_container_end_page |
44 |
_version_ |
1766062125131759616 |