Age and breeding stage‐related variation in the survival and harvest of temperate‐breeding Canada Geese in Ontario
ABSTRACT The abundance of Canada geese ( Branta canadensis ) nesting in temperate regions of North America has increased dramatically during the past half century. Numbers have reached nuisance levels in many areas and supplementary hunting seasons, which are timed to occur before and after traditio...
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crwiley:10.1002/jwmg.636 2024-09-15T18:00:21+00:00 Age and breeding stage‐related variation in the survival and harvest of temperate‐breeding Canada Geese in Ontario Iverson, Samuel A. Reed, Eric T. Hughes, R. John Forbes, Mark R. Environment Canada 2013 http://dx.doi.org/10.1002/jwmg.636 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjwmg.636 http://onlinelibrary.wiley.com/wol1/doi/10.1002/jwmg.636/fullpdf en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor The Journal of Wildlife Management volume 78, issue 1, page 24-34 ISSN 0022-541X 1937-2817 journal-article 2013 crwiley https://doi.org/10.1002/jwmg.636 2024-07-30T04:22:26Z ABSTRACT The abundance of Canada geese ( Branta canadensis ) nesting in temperate regions of North America has increased dramatically during the past half century. Numbers have reached nuisance levels in many areas and supplementary hunting seasons, which are timed to occur before and after traditional waterfowl hunting periods, are widely employed to limit population growth. We evaluated how changes in hunting regulations have affected population growth, the seasonal age distribution of harvest, and survival rates of temperate‐breeding Canada geese banded in Ontario. We found that although the number of geese harvested in the province has increased, population growth has not abated. Annual survival rates of locally nesting adults (i.e., after‐hatch‐year geese captured in brood flocks) have declined in association with harvest liberalization (pre‐liberalization: = 0.78 ± 0.06 SE; post‐liberalization: = 0.74 ± 0.04 SE) and we estimated negative process correlation between hunter recovery rates and survival rates within this group (ρ = − 0.24), which is indicative of an additive effect of harvest mortality on total mortality. However, peak harvest has advanced into early September, which is a time when large numbers of molt migrant individuals are present in northern portions of the population's range. Molt migrant flocks are comprised primarily of subadults and adult geese that failed to hatch eggs (i.e., non‐reproductive individuals), many of which are unaffiliated with the local breeding population. We found that hunter recovery rates of non‐reproductive geese were greater and survival rates were less than those of locally nesting adults; however, process correlation between recovery and survival rates was weakly positive (ρ = 0.09), which indicates that harvest mortality is at least partially compensatory within non‐reproductive cohorts. We conclude that current harvest levels are insufficient to halt population growth and that the influence of hunting, relative to its potential, is diminished by a ... Article in Journal/Newspaper Branta canadensis Wiley Online Library The Journal of Wildlife Management 78 1 24 34 |
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Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
ABSTRACT The abundance of Canada geese ( Branta canadensis ) nesting in temperate regions of North America has increased dramatically during the past half century. Numbers have reached nuisance levels in many areas and supplementary hunting seasons, which are timed to occur before and after traditional waterfowl hunting periods, are widely employed to limit population growth. We evaluated how changes in hunting regulations have affected population growth, the seasonal age distribution of harvest, and survival rates of temperate‐breeding Canada geese banded in Ontario. We found that although the number of geese harvested in the province has increased, population growth has not abated. Annual survival rates of locally nesting adults (i.e., after‐hatch‐year geese captured in brood flocks) have declined in association with harvest liberalization (pre‐liberalization: = 0.78 ± 0.06 SE; post‐liberalization: = 0.74 ± 0.04 SE) and we estimated negative process correlation between hunter recovery rates and survival rates within this group (ρ = − 0.24), which is indicative of an additive effect of harvest mortality on total mortality. However, peak harvest has advanced into early September, which is a time when large numbers of molt migrant individuals are present in northern portions of the population's range. Molt migrant flocks are comprised primarily of subadults and adult geese that failed to hatch eggs (i.e., non‐reproductive individuals), many of which are unaffiliated with the local breeding population. We found that hunter recovery rates of non‐reproductive geese were greater and survival rates were less than those of locally nesting adults; however, process correlation between recovery and survival rates was weakly positive (ρ = 0.09), which indicates that harvest mortality is at least partially compensatory within non‐reproductive cohorts. We conclude that current harvest levels are insufficient to halt population growth and that the influence of hunting, relative to its potential, is diminished by a ... |
author2 |
Environment Canada |
format |
Article in Journal/Newspaper |
author |
Iverson, Samuel A. Reed, Eric T. Hughes, R. John Forbes, Mark R. |
spellingShingle |
Iverson, Samuel A. Reed, Eric T. Hughes, R. John Forbes, Mark R. Age and breeding stage‐related variation in the survival and harvest of temperate‐breeding Canada Geese in Ontario |
author_facet |
Iverson, Samuel A. Reed, Eric T. Hughes, R. John Forbes, Mark R. |
author_sort |
Iverson, Samuel A. |
title |
Age and breeding stage‐related variation in the survival and harvest of temperate‐breeding Canada Geese in Ontario |
title_short |
Age and breeding stage‐related variation in the survival and harvest of temperate‐breeding Canada Geese in Ontario |
title_full |
Age and breeding stage‐related variation in the survival and harvest of temperate‐breeding Canada Geese in Ontario |
title_fullStr |
Age and breeding stage‐related variation in the survival and harvest of temperate‐breeding Canada Geese in Ontario |
title_full_unstemmed |
Age and breeding stage‐related variation in the survival and harvest of temperate‐breeding Canada Geese in Ontario |
title_sort |
age and breeding stage‐related variation in the survival and harvest of temperate‐breeding canada geese in ontario |
publisher |
Wiley |
publishDate |
2013 |
url |
http://dx.doi.org/10.1002/jwmg.636 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjwmg.636 http://onlinelibrary.wiley.com/wol1/doi/10.1002/jwmg.636/fullpdf |
genre |
Branta canadensis |
genre_facet |
Branta canadensis |
op_source |
The Journal of Wildlife Management volume 78, issue 1, page 24-34 ISSN 0022-541X 1937-2817 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jwmg.636 |
container_title |
The Journal of Wildlife Management |
container_volume |
78 |
container_issue |
1 |
container_start_page |
24 |
op_container_end_page |
34 |
_version_ |
1810437526483107840 |