Factors Influencing Reporting and Harvest Probabilities in North American Geese

Zimmerman, Guthrie S.; Moser, Timothy J.; Kendall, William L.; Doherty, Paul F.; White, Gary C.; Caswell, Dale

doi:10.2193/2008-145

Cited by 39 publications

(86 citation statements)

References 8 publications

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“…Reward band studies are typically used to estimate reporting rate (Nichols et al 1991, 1995, Royle and Garrettson 2005, Zimmerman et al 2009a, Boomer et al 2013. This method allows the estimation of harvest probability (h) separately from reporting (λ) probability (Henny and Burnham 1976), based on the assumption that a reward value is high enough to obtain a reporting rate approximating 1.0 (Conroy and Williams 1981, Nichols et al 1991, Royle and Garrettson 2005.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have examined reporting probabilities in duck and goose populations across North America (Nichols et al 1991, 1995, Royle and Garrettson 2005, Zimmerman et al 2009a, Boomer et al 2013. Zimmerman et al (2009a) examined the reporting probability in 12 populations of 4 goose species (Canada Geese Branta canadensis, Cackling Geese B. hutchinsii, Snow Geese Chen caerulescens, and Ross's Geese C. rossii) after introduction in the mid-1990s of the toll-free phone number to report banded birds that are shot.…”

Section: Introductionmentioning

confidence: 99%

“…Zimmerman et al (2009a) examined the reporting probability in 12 populations of 4 goose species (Canada Geese Branta canadensis, Cackling Geese B. hutchinsii, Snow Geese Chen caerulescens, and Ross's Geese C. rossii) after introduction in the mid-1990s of the toll-free phone number to report banded birds that are shot. They assessed variation in reporting probabilities among species, populations and harvest locations.…”

Section: Introductionmentioning

confidence: 99%

“…This goose population is unique in two ways, namely that harvest is equal or higher in Canada than in the U.S. (Calvert and Gauthier 2005), unlike most other waterfowl populations, and Canadian hunting occurs almost exclusively in Québec, the predominantly French-speaking province of Canada. Anecdotal observations (G. Gauthier, personal observation) suggested that cultural or linguistic differences could lead to differences in reporting rates between Québec and the U.S. (see also Zimmerman et al 2009a, Boomer et al 2013). Our analysis was based on a three-year reward band study conducted in Greater Snow Geese from 2003 to 2005, a subset of the large-scale study analyzed by Zimmerman et al (2009a).…”

Section: Introductionmentioning

confidence: 99%

“…Anecdotal observations (G. Gauthier, personal observation) suggested that cultural or linguistic differences could lead to differences in reporting rates between Québec and the U.S. (see also Zimmerman et al 2009a, Boomer et al 2013). Our analysis was based on a three-year reward band study conducted in Greater Snow Geese from 2003 to 2005, a subset of the large-scale study analyzed by Zimmerman et al (2009a). Based on the results of previous reward-band studies conducted on ducks and geese in North America, we expected no temporal variation in the reporting probability over our study period but a higher reporting probability in northeastern United States than in Québec.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Variations in band reporting rate and implications for kill rate in Greater Snow Geese

Souchay¹,

Giménez²,

Gauthier³

et al. 2014

ACE

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to 2005. We used a spatially explicit multinomial model based on 200 direct recoveries from 4256 banded geese to estimate reporting rate and harvest rate. We found that reporting rate for standard bands varied over time whereas harvest rate was higher in Canada than in the U.S. The reporting probability increased from 0.40 ± 0.11 in the first year of the study to 0.82 ± 0.14 and 0.84 ± 0.13 the second and third years, respectively. Overall, these reporting rates are higher than two previous estimates for this population, which leads to lower estimates of kill rate. However, the large annual differences in reporting rates found in this study lead to uncertainty in the estimation of kill rate. We suggest that the increase in reporting rate in the last two year of the study may be due to the dissemination of information among hunters regarding the presence of reward bands on birds, resulting in increased reporting rate for all bands. This raises issues about the need to adequately inform the public in such large-scale studies to avoid undesirable temporal trends over the course of the study. Nos résultats indiquent que le taux de retour par les chasseurs pour les bagues standards a varié au cours du temps, tandis que le taux de récolte était plus élevé au Canada qu'aux États-Unis. La probabilité de retour de bagues par les chasseurs a augmenté de 0,40 ± 0,11 la première année de l'étude à 0,82 ± 0,14 et 0,84 ± 0,13 les deuxième et troisième années, respectivement. Ces taux de retour de bagues sont supérieurs à ceux estimés précédemment pour cette population, entrainant des estimations du taux de récolte plus faibles. Toutefois, la forte variation interannuelle dans les taux de retour de bagues par les chasseurs observée dans la présente étude engendre une grande incertitude pour l'estimation du taux de récolte. Nous suggérons que l'augmentation du taux de retour de bagues observée au cours des deux dernières années de notre étude pourrait être attribuable à la dissémination de l'information au sein des chasseurs quant à l'existence de bagues récompense sur les oiseaux, conduisant ainsi à une augmentation du taux de retour pour tout type de bagues. Cette étude souligne l'importance des informations à transmettre au public lors d'études à grande échelle afin d'éviter des tendances temporelles indésirables au cours de celles-ci.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Variations in band reporting rate and implications for kill rate in Greater Snow Geese

Souchay¹,

Giménez²,

Gauthier³

et al. 2014

ACE

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Migratory connectivity of North American waterfowl across administrative flyways

Roberts

Scarpignato

Huysman

et al. 2023

Ecological Applications

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Management of waterfowl that migrate seasonally across North America occurs within four flyways that were delineated in the early 1900s to include the annual movements of populations. Movements may have changed over the past century since the administrative flyways were established, and may do so while management plans are in use, so information about transitions among flyways through time can illustrate how management assumptions may change. Today there are more than 12 million records from 60 years of migratory waterfowl band recoveries to assess adaptive management approaches that will be most effective when they account for movements within and between flyways. We examined how much the movement of North American waterfowl occurs between flyways, whether those movements have changed through time, and whether movements of mallards are representative of multiple species, as suggested by current harvest management strategies. We estimated the probability a duck would transition from one flyway to another and the strength of migratory connectivity (MC) for each species within and among flyways. We used capture-mark-recovery models to estimate population-specific movement within and among flyways (transition probabilities) for 15 migratory waterfowl species that were banded during breeding and recovered during winter. We developed new functionality in the R package MigConnectivity to estimate the species-specific strength of MC using transition probability samples from the capture-mark-recovery models.We found the regular movement of duck populations among flyways, overall weak MC, and no consistent change in migratory movements through time. Mallard movements were median among all duck species, but significantly different from many species, particularly diving ducks. Despite the significant movement between flyways, our work suggests flyway management of waterfowl matches many of the seasonal movements of these species when considering mid-continent flyway management. We recommend models accounting for all transition probabilities between populations and regularly estimating harvest derivations, transition probabilities, and MC metrics to verify that the current movements match model assumptions.

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Spatial and temporal variation in harvest probabilities for American black duck

Roy

Cumming

McIntire

2015

Ecology and Evolution

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Assessing spatial variation in waterfowl harvest probabilities from banding data is challenging because reporting and recovery probabilities have distinct spatial patterns that covary temporally with harvesting regulations, hunter effort, and reporting methods. We analyzed direct band recovery data from American black ducks banded on the Canadian breeding grounds from 1970 through 2010. Data were registered to a 1-degree grid and analyzed using hierarchical logistic regression models with spatially correlated errors to estimate the annual probabilities of band recovery and the proportion of individuals recovered in Canada. Probability of harvest was estimated from these values, in combination with independent estimates of reporting probabilities in Canada and the USA. Model covariates included estimates of hunting effort and factors for harvest regulation and band reporting methods. Both the band recovery processes and the proportion of individuals recovered in Canada had significant spatial structure. Recovery probabilities were highest in southern Ontario, along the Saint Lawrence River in Quebec, and in Nova Scotia. Black ducks breeding in Nova Scotia and southern Quebec were harvested predominantly in Canada. Recovery probabilities for juveniles were correlated with hunter effort, while the adult recoveries were weakly correlated with the implementation of stricter harvest regulations in the early 1980s. Mean harvest probability decreased in the northern portion of the survey area but remained stable or even increased in the south. Harvest probabilities for juveniles in 2010 exceeded 20% in southern Quebec and the Atlantic provinces. Our results demonstrate fine-scale variation in harvest probabilities for black duck on the Canadian breeding ground. In particular, harvest probabilities should be closely monitored along the Saint Lawrence River system and in the Atlantic provinces to avoid overexploitation.

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Factors Influencing Reporting and Harvest Probabilities in North American Geese

Cited by 39 publications

References 8 publications

Variations in band reporting rate and implications for kill rate in Greater Snow Geese

Variations in band reporting rate and implications for kill rate in Greater Snow Geese

Migratory connectivity of North American waterfowl across administrative flyways

Spatial and temporal variation in harvest probabilities for American black duck

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