Age bias in the bag of pink-footed geese : influence of flocking behaviour on vulnerability
International audience In pink-footed goose () wintering in Denmark, The Netherlands and Belgium, the proportion of juveniles in the hunting bag is consistently higher than that observed in the autumn population. Such juvenile bias in the bag is usually ascribed to young geese lacking experience wit...
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Online Access: | https://hal.science/hal-00548161 https://hal.science/hal-00548161/document https://hal.science/hal-00548161/file/10344_2009_349_ReferencePDF.pdf https://doi.org/10.1007/s10344-009-0349-1 |
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ftccsdartic:oai:HAL:hal-00548161v1 2023-09-26T15:22:11+02:00 Age bias in the bag of pink-footed geese : influence of flocking behaviour on vulnerability Madsen, Jesper Department of Arctic Environment Rockilde Aarhus University Aarhus -National Environmental Research Institute Danmark (NERI) 2009-12-19 https://hal.science/hal-00548161 https://hal.science/hal-00548161/document https://hal.science/hal-00548161/file/10344_2009_349_ReferencePDF.pdf https://doi.org/10.1007/s10344-009-0349-1 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s10344-009-0349-1 hal-00548161 https://hal.science/hal-00548161 https://hal.science/hal-00548161/document https://hal.science/hal-00548161/file/10344_2009_349_ReferencePDF.pdf doi:10.1007/s10344-009-0349-1 info:eu-repo/semantics/OpenAccess ISSN: 1612-4642 European Journal of Wildlife Research https://hal.science/hal-00548161 European Journal of Wildlife Research, 2009, 56 (4), pp.577-582. ⟨10.1007/s10344-009-0349-1⟩ Flocking Juvenile mortality Harvest Predation risk Predator swamping info:eu-repo/semantics/article Journal articles 2009 ftccsdartic https://doi.org/10.1007/s10344-009-0349-1 2023-08-26T22:24:44Z International audience In pink-footed goose () wintering in Denmark, The Netherlands and Belgium, the proportion of juveniles in the hunting bag is consistently higher than that observed in the autumn population. Such juvenile bias in the bag is usually ascribed to young geese lacking experience with hunting or disruption of juveniles from families. An alternative explanation may be that flocking behaviour of families make juveniles more vulnerable. Observations of morning flights of pink-footed geese to the feeding grounds from two of the major autumn-staging areas showed that geese were distributed in many small flocks (median flock size = 9). This was not significantly different from the flock size distribution shot at by hunters (median = 8), suggesting that hunters targeted goose flock size in proportion to the general probability of encounter. The rate at which hunters downed geese was independent of flock size. The ratio between juveniles and adults in flocks decreased with flock size and flocks of <60 individuals primarily comprised family groups. The likelihood of being shot at was 2.4 times higher for juveniles and 3.4 times higher for older birds in small flocks (<10 individuals) compared to larger flocks. The observations suggest that both juveniles as well as successful adult breeding birds were more vulnerable than non-breeding/failed breeding birds as a result of flocking behaviour. Article in Journal/Newspaper Pink-footed Goose Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) European Journal of Wildlife Research 56 4 577 582 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Flocking Juvenile mortality Harvest Predation risk Predator swamping |
spellingShingle |
Flocking Juvenile mortality Harvest Predation risk Predator swamping Madsen, Jesper Age bias in the bag of pink-footed geese : influence of flocking behaviour on vulnerability |
topic_facet |
Flocking Juvenile mortality Harvest Predation risk Predator swamping |
description |
International audience In pink-footed goose () wintering in Denmark, The Netherlands and Belgium, the proportion of juveniles in the hunting bag is consistently higher than that observed in the autumn population. Such juvenile bias in the bag is usually ascribed to young geese lacking experience with hunting or disruption of juveniles from families. An alternative explanation may be that flocking behaviour of families make juveniles more vulnerable. Observations of morning flights of pink-footed geese to the feeding grounds from two of the major autumn-staging areas showed that geese were distributed in many small flocks (median flock size = 9). This was not significantly different from the flock size distribution shot at by hunters (median = 8), suggesting that hunters targeted goose flock size in proportion to the general probability of encounter. The rate at which hunters downed geese was independent of flock size. The ratio between juveniles and adults in flocks decreased with flock size and flocks of <60 individuals primarily comprised family groups. The likelihood of being shot at was 2.4 times higher for juveniles and 3.4 times higher for older birds in small flocks (<10 individuals) compared to larger flocks. The observations suggest that both juveniles as well as successful adult breeding birds were more vulnerable than non-breeding/failed breeding birds as a result of flocking behaviour. |
author2 |
Department of Arctic Environment Rockilde Aarhus University Aarhus -National Environmental Research Institute Danmark (NERI) |
format |
Article in Journal/Newspaper |
author |
Madsen, Jesper |
author_facet |
Madsen, Jesper |
author_sort |
Madsen, Jesper |
title |
Age bias in the bag of pink-footed geese : influence of flocking behaviour on vulnerability |
title_short |
Age bias in the bag of pink-footed geese : influence of flocking behaviour on vulnerability |
title_full |
Age bias in the bag of pink-footed geese : influence of flocking behaviour on vulnerability |
title_fullStr |
Age bias in the bag of pink-footed geese : influence of flocking behaviour on vulnerability |
title_full_unstemmed |
Age bias in the bag of pink-footed geese : influence of flocking behaviour on vulnerability |
title_sort |
age bias in the bag of pink-footed geese : influence of flocking behaviour on vulnerability |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.science/hal-00548161 https://hal.science/hal-00548161/document https://hal.science/hal-00548161/file/10344_2009_349_ReferencePDF.pdf https://doi.org/10.1007/s10344-009-0349-1 |
genre |
Pink-footed Goose |
genre_facet |
Pink-footed Goose |
op_source |
ISSN: 1612-4642 European Journal of Wildlife Research https://hal.science/hal-00548161 European Journal of Wildlife Research, 2009, 56 (4), pp.577-582. ⟨10.1007/s10344-009-0349-1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s10344-009-0349-1 hal-00548161 https://hal.science/hal-00548161 https://hal.science/hal-00548161/document https://hal.science/hal-00548161/file/10344_2009_349_ReferencePDF.pdf doi:10.1007/s10344-009-0349-1 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1007/s10344-009-0349-1 |
container_title |
European Journal of Wildlife Research |
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56 |
container_issue |
4 |
container_start_page |
577 |
op_container_end_page |
582 |
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1778147716659937280 |