Survival of Female Canvasbacks Wintering in Coastal Louisiana

Hohman, William L.; Pritchert, Ronald D.; Moore, J. Russell; Schaeffer, Dorcas O.

doi:10.2307/3809076

Cited by 11 publications

(2 citation statements)

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“…Depredation of females during nesting has been documented in Harlequin Ducks (Brodeur 1997, Bruner 1997. Additionally, over-summer survival is higher in nonbreeding rather than breeding female Mallards (Anas platyrhynchos) (Reynolds et al 1995), and female survival of Canvasbacks (Aythya valisineria) is high outside the breeding season (Hohman et al 1993).…”

Section: Local Survivalmentioning

confidence: 99%

Survival, Emigration, and Winter Population Structure of Harlequin Ducks

Cooke

Robertson

Smith

et al. 2000

Condor

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. University of California Press and Cooper Ornithological Society are collaborating with JSTOR to digitize, preserve and extend access to The Condor. Abstract. A population of individually marked Harlequin Ducks (Histrionicus histrion-icus) at White Rock, British Columbia, Canada was examined to measure the degree of population differentiation among birds which pair during the winter months. This required an understanding of the patterns of emigration among wintering sites in different segments of the population. Some juveniles arrived at the wintering grounds accompanied by their mothers, thus initially arriving into the same winter population as their parents. Young males were more likely than young females to disperse during the first two years of life. Adult males had higher local survival than adult females during the summer months, probably because of the greater mortality risks to nesting females. During the nonbreeding seasons, local survival was the same in both sexes. Paired males had a local survival of more than 90%, suggesting both high survival and strong philopatry. Unpaired males had a lower local survival rate, suggesting they have higher mortality and/or emigration rates. Young females had the same local survival rate as adult females, suggesting that they did not disperse during the winter. These winter philopatry patterns are similar to the general pattern of breeding philopatry in waterfowl, with females showing stronger philopatry than males, and paired adults stronger philopatry than unpaired and young birds. The dispersal of young males makes local population differentiation unlikely in this species.

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Section: Local Survivalmentioning

confidence: 99%

Survival, Emigration, and Winter Population Structure of Harlequin Ducks

Cooke

Robertson

Smith

et al. 2000

Condor

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“…1,2,6,[8][9][10] External transmitters attached with sutures suffer unacceptable rates of loss. 1,11 Transmitters that use internal coiled antennas [12][13][14][15][16] implanted in the coelom of mallards (Anas platyrhynchos) do not affect reproduction. 1 However, transmitters that are completely implanted suffer transmission path loss, which reduces signal strength and limits detection range.…”

Section: Introductionmentioning

confidence: 99%

Inflammatory Reaction to Fabric Collars From Percutaneous Antennas Attached to Intracoelomic Radio Transmitters Implanted in Harlequin Ducks (Histrionicus histrionicus)

Mulcahy

Burek²,

Esler³

2007

Journal of Avian Medicine and Surgery

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In wild birds implanted intracoelomically with radio transmitters, a synthetic fabric collar placed around the base of a percutaneous antenna is believed to function as a barrier to contamination of the coelom. We examined 13 fabric collars recovered from percutaneous antennas of radio transmitters implanted intracoelomically in harlequin ducks (Histrionicus histrionicus) 12 months earlier. Both the transmitters and antenna collars were encapsulated in fibrous connective tissue, with adhesions to internal organs. Histologically, bacteria were evident at the fabric-plastic interface in 8 of 10 collars examined in cross section and along the length of the collar in 3 collars examined longitudinally. Bacteria were confined within the fibrotic sheath surrounding the transmitter and the antenna collar in all birds. No evidence of chronic systemic effects secondary to implantation was present on hematologic or serum biochemical testing. These findings indicate that antenna collars do not prevent the entry of bacteria along the percutaneous antenna but may help stabilize the antenna and minimize coelomic contamination. We conclude that radio transmitters implanted into the coelom of harlequin ducks do not appear to cause significant health problems for at least 1 year after implantation.

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Survival, Emigration, and Winter Population Structure of Harlequin Ducks

Cooke¹,

Robertson

Smith

et al. 2000

The Condor

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A population of individually marked Harlequin Ducks (Histrionicus histrionicus) at White Rock, British Columbia, Canada was examined to measure the degree of population differentiation among birds which pair during the winter months. This required an understanding of the patterns of emigration among wintering sites in different segments of the population. Some juveniles arrived at the wintering grounds accompanied by their mothers, thus initially arriving into the same winter population as their parents. Young males were more likely than young females to disperse during the first two years of life. Adult males had higher local survival than adult females during the summer months, probably because of the greater mortality risks to nesting females. During the nonbreeding seasons, local survival was the same in both sexes. Paired males had a local survival of more than 90%, suggesting both high survival and strong philopatry. Unpaired males had a lower local survival rate, suggesting they have higher mortality and/or emigration rates. Young females had the same local survival rate as adult females, suggesting that they did not disperse during the winter. These winter philopatry patterns are similar to the general pattern of breeding philopatry in waterfowl, with females showing stronger philopatry than males, and paired adults stronger philopatry than unpaired and young birds. The dispersal of young males makes local population differentiation unlikely in this species.

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Survival of Female Canvasbacks Wintering in Coastal Louisiana

Cited by 11 publications

References 0 publications

Survival, Emigration, and Winter Population Structure of Harlequin Ducks

Survival, Emigration, and Winter Population Structure of Harlequin Ducks

Inflammatory Reaction to Fabric Collars From Percutaneous Antennas Attached to Intracoelomic Radio Transmitters Implanted in Harlequin Ducks (Histrionicus histrionicus)

Survival, Emigration, and Winter Population Structure of Harlequin Ducks

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