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Predators of Dusky Canada Goose goslings and the effect of transmitters on gosling survival

2008; Association of Field Ornithologists; Volume: 79; Issue: 4 Linguagem: Inglês

10.1111/j.1557-9263.2008.00191.x

1557-9263

Thomas F. Fondell, James B. Grand, David A. Miller, Richard Anthony,

Ecology and Vegetation Dynamics Studies

Journal of Field OrnithologyVolume 79, Issue 4 p. 399-407 Predators of Dusky Canada Goose goslings and the effect of transmitters on gosling survival Los predadores de juveniles de Branta canadensis occidentalis y el efecto de radiotransmisores sobre su sobrevivencia Thomas F. Fondell, Corresponding Author Thomas F. Fondell U.S. Geological Survey, Alaska Science Center, 4210 University Drive, Anchorage, Alaska 99508, USA Corresponding author. Email: [email protected] Current address: Alabama Cooperative Fish and Wildlife Research Unit, U. S. Geological Survey, 108 White Smith Hall, Auburn University, Auburn, AL 36849, USA.Search for more papers by this authorJames B. Grand, Corresponding Author James B. Grand U.S. Geological Survey, Alaska Science Center, 4210 University Drive, Anchorage, Alaska 99508, USA Corresponding author. Email: [email protected] Current address: Alabama Cooperative Fish and Wildlife Research Unit, U. S. Geological Survey, 108 White Smith Hall, Auburn University, Auburn, AL 36849, USA.Search for more papers by this authorDavid A. Miller, David A. Miller Department of Natural Resource Ecology and Management, 339 Science II, Iowa State University, Ames, IA 50011, USASearch for more papers by this authorR. Michael Anthony, R. Michael Anthony U.S. Geological Survey, Alaska Science Center, 4210 University Drive, Anchorage, Alaska 99508, USASearch for more papers by this author Thomas F. Fondell, Corresponding Author Thomas F. Fondell U.S. Geological Survey, Alaska Science Center, 4210 University Drive, Anchorage, Alaska 99508, USA Corresponding author. Email: [email protected] Current address: Alabama Cooperative Fish and Wildlife Research Unit, U. S. Geological Survey, 108 White Smith Hall, Auburn University, Auburn, AL 36849, USA.Search for more papers by this authorJames B. Grand, Corresponding Author James B. Grand U.S. Geological Survey, Alaska Science Center, 4210 University Drive, Anchorage, Alaska 99508, USA Corresponding author. Email: [email protected] Current address: Alabama Cooperative Fish and Wildlife Research Unit, U. S. Geological Survey, 108 White Smith Hall, Auburn University, Auburn, AL 36849, USA.Search for more papers by this authorDavid A. Miller, David A. Miller Department of Natural Resource Ecology and Management, 339 Science II, Iowa State University, Ames, IA 50011, USASearch for more papers by this authorR. Michael Anthony, R. Michael Anthony U.S. Geological Survey, Alaska Science Center, 4210 University Drive, Anchorage, Alaska 99508, USASearch for more papers by this author First published: 08 December 2008 https://doi.org/10.1111/j.1557-9263.2008.00191.xCitations: 1Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstracten ABSTRACT The population of Dusky Canada Geese (Branta canadensis occidentalis) has been in long-term decline, likely due to reduced breeding productivity. To identify causes of mortality, we monitored goslings marked with radio transmitters on the western Copper River Delta, Alaska, from 1997 to 1999. Almost all gosling mortality (96%; 81 of 84) was due to predation, with mink (Mustela vison) and Bald Eagles (Haliaeetus leucocephalus) the most important predators. Bald Eagles are also major nest predators and, thus, appear to play a key role in limiting the breeding productivity of Dusky Canada Geese. Daily survival rate for goslings to 28 d of age was lower (0.011; 95% CI 0.002−0.024) for those with transmitters than for those without, but did not differ for older goslings (29−45 d). Although finer resolution in the timing of the transmitter effect within the first 28 d was not possible, we found that, by limiting our sample to goslings that survived until after 2−3 d posthatching, support for a transmitter effect was much reduced. Younger, smaller birds are inherently more vulnerable than older birds to transmitter effects. In addition, the process of radio-marking may have delayed the departure of goslings from nests and increased their risk of mortality shortly after hatching. Although radio transmitters may often be the only practical means for determining causes of mortality for young waterfowl, we suggest caution in using transmitters because of their potential negative effects, particularly during the first few days after hatching. SINOPSISes El tamaño poblacional de Branta canadensis occidentalis ha disminuido durante varios años, probablemente porque existe una reducción en su tasa reproductiva. Para identificar las causas de la mortalidad en esta especie, monitoreamos juveniles marcados con radiotransmisores en la delta del Río Copper, Alaska durante 1997–1999. Casi toda la mortalidad de los juveniles (96%; 81 de 84) fue causado por la depredación, con Mustela vison y Haliaeetus leucocephalus representando los predadores mas importantes. H. leucocephalus también son predadores importantes del nido y por eso parecen jugar un papel importante en limitar la productividad de B. canadensis occidentalis. La tasa de sobrevivencia diaria de los juveniles hasta los 28 días de edad fue mas baja (0.011; 95% IC, 0.002–0.024) para los que portaban transmisores en comparación a los que no portaban transmisores, pero no fue diferente en juveniles mayores (de 29–45 días de edad). Aunque una resolución mas detallada a través del tiempo del efecto de los transmisores durante los primeros 28 días no fue posible, encontramos menos apoyo para un efecto de los transmisores cuando limitamos nuestra muestra a juveniles que sobrevivieron hasta 2–3 días después de que eclosionaron. Juveniles más jóvenes y pequeños son más vulnerables a los efectos de los transmisores que individuos mayores. 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