Survival of Captive and Free-ranging Harlequin Ducks (Histrionicus histrionicus) following Surgical Liver Biopsy

Mulcahy, Daniel M.; Esler, Daniel

doi:10.7589/0090-3558-46.4.1325

Cited by 10 publications

(10 citation statements)

References 20 publications

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“…Differentiating mortality from radio failure is difficult, although temperature and voltage variation from transmissions can offer clues. In this case, up to 31 of the excluded individuals showed potential for mortality (11.4% of marked birds), which is a considerably higher mortality rate than that shown in other cases (1.5% for implanted Harlequin Ducks [Histrionicus histrionicus]; Mulcahy and Esler 1999). Many of these individuals were associated with particularly cold capture conditions in Alaska; future studies should consider these findings in efforts to reduce post-surgery mortality.…”

Section: Resultsmentioning

confidence: 66%

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Migratory connectivity and variation in migration phenology within the Pacific population of Barrow's Goldeneye (Bucephala islandica)

Forstner¹,

Boyd²,

Esler³

et al. 2022

ACE

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Effective management of migratory animals requires an understanding of individual movement patterns throughout the annual cycle. We used satellite transmitters to track adult Barrow's Goldeneye (Bucephala islandica) captured at five wintering sites, one breeding site, and one molting site from across the species' geographic range in western North America. The data were analyzed to assess the strength of migratory connectivity and determine latitudinal and sex effects on migration phenology. At the range-wide scale, migratory connectivity was high; cluster analyses showed subpopulations aggregated at each stage of the annual cycle. Barrow's Goldeneye from all wintering latitudes traveled north and east to breed. Compared to females, males traveled farther north to molt and consequently traveled longer distances when returning to their wintering areas. Wintering latitude had little effect on migration distance but a large effect on the phenology of migration. Individuals that wintered at northern latitudes arrived on their wintering areas earlier and departed later than individuals that wintered farther south. Individuals that wintered at northern latitudes also arrived on and left their inland breeding areas later but left their molting sites earlier than individuals that wintered farther south. Sex also influenced the phenology of migration at all sites: males left their mates during incubation and consequently spent less time on breeding areas and more time on their molting and fall staging areas. The high level of migratory connectivity observed in this study suggests that the subpopulation of Barrow's Goldeneye in south-central Alaska is demographically independent from subpopulations in southeast Alaska and British Columbia, and could be managed separately. Connectivité migratoire et variation de la phénologie de migration au sein de la population du Pacifique du Garrot d'Islande (Bucephala islandica)RÉSUMÉ. Une gestion efficace de la faune migratrice passe par une compréhension de la tendance des déplacements individuels tout au long du cycle annuel. Au moyen d'émetteurs satellites, nous avons suivi des Garrots d'Islande (Bucephala islandica) adultes capturés à cinq sites d'hivernage, un site de reproduction et un site de mue dans l'ensemble de l'aire de répartition géographique de l'espèce dans l'Ouest de l'Amérique du Nord. Nous avons analysé les données de façon à évaluer la force de la connectivité migratoire et à déterminer les effets de la latitude et du sexe sur la phénologie de migration. À l'échelle de l'aire de répartition, la connectivité migratoire était élevée; les analyses par grappes ont montré que les sous-populations se regroupaient à chaque étape du cycle annuel. Les Garrots d'Islande de diverses latitudes d'hivernage ont voyagé vers le nord et l'est pour se reproduire. Comparativement aux femelles, les mâles se sont déplacés plus au nord pour muer et ont donc parcouru de plus grandes distances pour retourner dans leurs zones d'hivernage. La latitude d'hivernage a eu peu d'effets sur la dis...

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Section: Resultsmentioning

confidence: 66%

“…Experienced wildlife veterinarians surgically implanted a PTT (26-38 g Microwave Telemetry and Telonics transmitters) in the coelomic cavity of each Barrow's Goldeneye, following standardized methods described in Mulcahy and Esler (1999).…”

Section: Study Species and Study Designmentioning

confidence: 99%

Migratory connectivity and variation in migration phenology within the Pacific population of Barrow's Goldeneye (Bucephala islandica)

Forstner¹,

Boyd²,

Esler³

et al. 2022

ACE

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“…Additionally, we have no evidence that the transmitter implantation procedure had a significant effect on survival probability or harvests rates. We removed only 1 female ring‐necked duck from our sample because of potential implantation‐related mortality within a standard 2‐week period following surgery and release (Mulcahy and Esler 1999). Studies of other diving duck species have reported comparatively high numbers of potential implantation‐related mortalities within a 2‐week period (e.g., Custer et al 1996, Mallory et al 2006, Roy et al 2014).…”

Section: Discussionmentioning

confidence: 99%

“…We were unable to recover the bodies of individuals that suffered non‐harvest mortalities during the study. Because we could not discount possible implant procedure effects, we removed individuals with non‐harvest mortalities occurring within the first 2 weeks from our sample (Mulcahy and Esler 1999).…”

Section: Methodsmentioning

confidence: 99%

“…To aid in determination of mortality by harvest, we marked transmitters with contact information for hunters to directly report kills. We evaluated all mortalities occurring within a standard 2‐week acclimation period post‐surgery before including individuals in the sample (Mulcahy and Esler 1999, McCloskey et al 2018). We investigated any harvests occurring within 2 weeks of deployment to determine if the implant procedure could have increased the birds' harvest probability.…”

Section: Methodsmentioning

confidence: 99%

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Winter Survival of Female Ring‐Necked Ducks in the Southern Atlantic Flyway

Mezebish

Olsen²,

Goodman³

et al. 2020

J Wildl Manag

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North American waterfowl harvest regulations are largely guided by the status of breeding populations. Nonetheless, understanding the demographics of wintering waterfowl populations can elucidate the effects of hunting pressure on population dynamics. The ring-necked duck (Aythya collaris) breeds and winters in all North American administrative flyways and is one of the most abundant and most harvested diving ducks in the Atlantic Flyway. But few studies have investigated the winter ecology of ringnecked ducks. We used a known-fate analysis to estimate period survival probability using data from 87 female ring-necked ducks marked with satellite transmitters in 2 regions of the southern Atlantic Flyway during winters of 2017-2018 and 2018-2019. Winter (128-day) survival probability was higher for individuals in the Red Hills region of southern Georgia and northern Florida (0.875, 95% CI = 0.691-0.952) than individuals in central South Carolina (0.288, 95% CI = 0.082-0.514). We attribute the regional disparity in winter survival probabilities to differences in hunting pressure, which are reflected in the number of harvests we observed in each region. Our findings warrant further investigation into regional variation in winter survival of southern Atlantic Flyway ring-necked ducks, and, specifically, the relationship between variable harvest pressure and winter survival and its influence on ring-necked duck population dynamics and adaptive harvest management decisions.

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Free‐Living Waterfowl and Shorebirds

Mulcahy¹

2014

Zoo Animal and Wildlife Immobilization and Anesthesia

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Survival of Captive and Free-ranging Harlequin Ducks (Histrionicus histrionicus) following Surgical Liver Biopsy

Cited by 10 publications

References 20 publications

Migratory connectivity and variation in migration phenology within the Pacific population of Barrow's Goldeneye (Bucephala islandica)

Migratory connectivity and variation in migration phenology within the Pacific population of Barrow's Goldeneye (Bucephala islandica)

Winter Survival of Female Ring‐Necked Ducks in the Southern Atlantic Flyway

Free‐Living Waterfowl and Shorebirds

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