Effects of exploitation on an overabundant species: the lesser snow goose predicament
Invasive and overabundant species are an increasing threat to biodiversity and ecosystem functioning world-wide. As such, large amounts of money are spent each year on attempts to control them. These efforts can, however, be thwarted if exploitation is compensated demographically or if populations s...
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ftutahsudc:oai:digitalcommons.usu.edu:wild_facpub-2498 2023-05-15T15:17:34+02:00 Effects of exploitation on an overabundant species: the lesser snow goose predicament Koons, David N. 2014-01-01T08:00:00Z application/pdf https://digitalcommons.usu.edu/wild_facpub/1498 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=2498&context=wild_facpub unknown Hosted by Utah State University Libraries https://digitalcommons.usu.edu/wild_facpub/1498 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=2498&context=wild_facpub Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact the Institutional Repository Librarian at digitalcommons@usu.edu. PDM Wildland Resources Faculty Publications additive mortality capture–mark–recapture cause-specific mortality Chen caerulescens caerulescens compensatory mortality harvest native invasive species population control Life Sciences text 2014 ftutahsudc 2022-10-27T17:22:15Z Invasive and overabundant species are an increasing threat to biodiversity and ecosystem functioning world-wide. As such, large amounts of money are spent each year on attempts to control them. These efforts can, however, be thwarted if exploitation is compensated demographically or if populations simply become too numerous for management to elicit an effective and rapid functional response. We examined the influence of these mechanisms on cause-specific mortality in lesser snow geese using multistate capture–reencounter methods. The abundance and destructive foraging behaviours of snow geese have created a trophic cascade that reduces (sub-) Arctic plant, insect and avian biodiversity, bestowing them the status of ‘overabundant’. Historically, juvenile snow geese suffered from density-related degradation of their saltmarsh brood-rearing habitat. This allowed harvest mortality to be partially compensated by non-harvest mortality (process correlation between mortality sources: ρ = −0·47; 90% BCI: −0·72 to −0·04). Snow goose family groups eventually responded to their own degradation of habitat by dispersing to non-degraded areas. This relaxed the pressure of density dependence on juvenile birds, but without this mechanism for compensation, harvest began to have an additive effect on overall mortality (ρ = 0·60; 90% BCI: −0·06 to 0·81). In adults, harvest had an additive effect on overall mortality throughout the 42-year study (ρ = 0·24; 90% BCI: −0·59 to 0·67). With the aim of controlling overabundant snow geese, the Conservation Order amendment to the International Migratory Bird Treaty was implemented in February of 1999 to allow for harvest regulations that had not been allowed since the early 1900s (e.g. a spring harvest season, high or unlimited bag limits and use of electronic calls and unplugged shotguns). Although harvest mortality momentarily increased following these actions, the increasing abundance of snow geese has since induced a state of satiation in harvest that has driven harvest rates below the ... Text Arctic Utah State University: DigitalCommons@USU Arctic |
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Open Polar |
collection |
Utah State University: DigitalCommons@USU |
op_collection_id |
ftutahsudc |
language |
unknown |
topic |
additive mortality capture–mark–recapture cause-specific mortality Chen caerulescens caerulescens compensatory mortality harvest native invasive species population control Life Sciences |
spellingShingle |
additive mortality capture–mark–recapture cause-specific mortality Chen caerulescens caerulescens compensatory mortality harvest native invasive species population control Life Sciences Koons, David N. Effects of exploitation on an overabundant species: the lesser snow goose predicament |
topic_facet |
additive mortality capture–mark–recapture cause-specific mortality Chen caerulescens caerulescens compensatory mortality harvest native invasive species population control Life Sciences |
description |
Invasive and overabundant species are an increasing threat to biodiversity and ecosystem functioning world-wide. As such, large amounts of money are spent each year on attempts to control them. These efforts can, however, be thwarted if exploitation is compensated demographically or if populations simply become too numerous for management to elicit an effective and rapid functional response. We examined the influence of these mechanisms on cause-specific mortality in lesser snow geese using multistate capture–reencounter methods. The abundance and destructive foraging behaviours of snow geese have created a trophic cascade that reduces (sub-) Arctic plant, insect and avian biodiversity, bestowing them the status of ‘overabundant’. Historically, juvenile snow geese suffered from density-related degradation of their saltmarsh brood-rearing habitat. This allowed harvest mortality to be partially compensated by non-harvest mortality (process correlation between mortality sources: ρ = −0·47; 90% BCI: −0·72 to −0·04). Snow goose family groups eventually responded to their own degradation of habitat by dispersing to non-degraded areas. This relaxed the pressure of density dependence on juvenile birds, but without this mechanism for compensation, harvest began to have an additive effect on overall mortality (ρ = 0·60; 90% BCI: −0·06 to 0·81). In adults, harvest had an additive effect on overall mortality throughout the 42-year study (ρ = 0·24; 90% BCI: −0·59 to 0·67). With the aim of controlling overabundant snow geese, the Conservation Order amendment to the International Migratory Bird Treaty was implemented in February of 1999 to allow for harvest regulations that had not been allowed since the early 1900s (e.g. a spring harvest season, high or unlimited bag limits and use of electronic calls and unplugged shotguns). Although harvest mortality momentarily increased following these actions, the increasing abundance of snow geese has since induced a state of satiation in harvest that has driven harvest rates below the ... |
format |
Text |
author |
Koons, David N. |
author_facet |
Koons, David N. |
author_sort |
Koons, David N. |
title |
Effects of exploitation on an overabundant species: the lesser snow goose predicament |
title_short |
Effects of exploitation on an overabundant species: the lesser snow goose predicament |
title_full |
Effects of exploitation on an overabundant species: the lesser snow goose predicament |
title_fullStr |
Effects of exploitation on an overabundant species: the lesser snow goose predicament |
title_full_unstemmed |
Effects of exploitation on an overabundant species: the lesser snow goose predicament |
title_sort |
effects of exploitation on an overabundant species: the lesser snow goose predicament |
publisher |
Hosted by Utah State University Libraries |
publishDate |
2014 |
url |
https://digitalcommons.usu.edu/wild_facpub/1498 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=2498&context=wild_facpub |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Wildland Resources Faculty Publications |
op_relation |
https://digitalcommons.usu.edu/wild_facpub/1498 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=2498&context=wild_facpub |
op_rights |
Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact the Institutional Repository Librarian at digitalcommons@usu.edu. |
op_rightsnorm |
PDM |
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1766347809220460544 |