The effects of human disturbance on the seabirds and seals at sub-Antarctic Marion Island

 

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dc.contributor.advisor De Villiers, M S en_ZA
dc.contributor.advisor Underhill, Leslie G en_ZA
dc.contributor.author Wheeler, Mariette en_ZA
dc.date.accessioned 2015-02-11T14:19:27Z
dc.date.available 2015-02-11T14:19:27Z
dc.date.issued 2009 en_ZA
dc.identifier.citation Wheeler, M. 2009. The effects of human disturbance on the seabirds and seals at sub-Antarctic Marion Island. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/12469
dc.description Includes bibliographical references en_ZA
dc.description.abstract Animals at Marion Island can be affected by logistic disturbance (especially helicopter noise), incidental pedestrian disturbance and research disturbance. The responses of wandering albatrosses (Diomedea exulans) and king penguins (Aptenodytes patagonicus) were investigated through standardised pedestrian approaches. Intensity of behavioural responses and levels of prolactin (females only) indicated that adult wandering albatrosses had become sensitised by high levels of chronic disturbance. Responses were greatest during the Prospecting and Early Incubation phases. Frequency of disturbance did not influence behavioural responses, but birds visited most often over three consecutive days had the lowest chick survival. Guarding king penguins were less likely to move away during disturbance than non-breeding groups. Visit duration and approach distance affected behavioural responses. There was evidence of habituation by king penguins to current levels of incidental disturbance. Grey-headed albatross (Thalassarche chrysostoma) adults and chicks showed short-term behavioural responses to research disturbance, and recovery times were variable. Level of chronic disturbance did not explain breeding success differences between colony sections. Instantaneous scans or counts of guarding and brooding gentoo penguins (Pygoscelis papua), incubating Crozet shags (Phalacrocoraxmelanogenis), pre-fledging grey-headed albatross chicks and non-breeding king penguins were made before and during helicopter operations. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Zoology en_ZA
dc.title The effects of human disturbance on the seabirds and seals at sub-Antarctic Marion Island en_ZA
dc.type Doctoral Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Biological Sciences en_ZA
dc.type.qualificationlevel Doctoral
dc.type.qualificationname PhD en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Wheeler, M. (2009). <i>The effects of human disturbance on the seabirds and seals at sub-Antarctic Marion Island</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/12469 en_ZA
dc.identifier.chicagocitation Wheeler, Mariette. <i>"The effects of human disturbance on the seabirds and seals at sub-Antarctic Marion Island."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2009. http://hdl.handle.net/11427/12469 en_ZA
dc.identifier.vancouvercitation Wheeler M. The effects of human disturbance on the seabirds and seals at sub-Antarctic Marion Island. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2009 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/12469 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Wheeler, Mariette AB - Animals at Marion Island can be affected by logistic disturbance (especially helicopter noise), incidental pedestrian disturbance and research disturbance. The responses of wandering albatrosses (Diomedea exulans) and king penguins (Aptenodytes patagonicus) were investigated through standardised pedestrian approaches. Intensity of behavioural responses and levels of prolactin (females only) indicated that adult wandering albatrosses had become sensitised by high levels of chronic disturbance. Responses were greatest during the Prospecting and Early Incubation phases. Frequency of disturbance did not influence behavioural responses, but birds visited most often over three consecutive days had the lowest chick survival. Guarding king penguins were less likely to move away during disturbance than non-breeding groups. Visit duration and approach distance affected behavioural responses. There was evidence of habituation by king penguins to current levels of incidental disturbance. Grey-headed albatross (Thalassarche chrysostoma) adults and chicks showed short-term behavioural responses to research disturbance, and recovery times were variable. Level of chronic disturbance did not explain breeding success differences between colony sections. Instantaneous scans or counts of guarding and brooding gentoo penguins (Pygoscelis papua), incubating Crozet shags (Phalacrocoraxmelanogenis), pre-fledging grey-headed albatross chicks and non-breeding king penguins were made before and during helicopter operations. DA - 2009 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2009 T1 - The effects of human disturbance on the seabirds and seals at sub-Antarctic Marion Island TI - The effects of human disturbance on the seabirds and seals at sub-Antarctic Marion Island UR - http://hdl.handle.net/11427/12469 ER - en_ZA


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