Journal article Open Access

Demographic Consequences of Changed Pupping and Hauling Sites of the Hawaiian Monk Seal

Gerrodette, Tim; Gilmartin, William G.


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    "description": "Abstract: During the last 30 years, changes in the size of Hawaiian monk seal populations at several locations have been associated with the amount and type of human disturbance. Recreational beach activities caused monk seals to alter their pupping and hauling patterns. Survival of pups in suboptimal habitats was low, leading to gradual population declines. During the last decade at Kure Atoll, the process has been reversed human disturbance on beaches has decreased and traditional pupping and hauling sites have been reestablished Subsequently, high survival rates of young seals, coupled with two successful enhancement programs for female pups, have led to dramatic changes in the age and sex composition of the population. Based on these changes, the monk seal population at Kure Atoll soon should begin to increase. Apparently small behavioral changes in such vital activities as feeding and reproduction can have large demographic consequences. Therefore, monitoring of endangered species should include data on habitat use and age and sex composition, as well as estimates of abundance.\n\nResumen: Durante los \u00faltimos treinta a\u00f1os, los cambios en el tama\u00f1o de las poblaciones de la foca de Hawai en varias localidades, ban sido asociados con la cantidad y el tipo de perturbaci\u00f3n humana. Las actividades recreatiuas en las playas causaron que las focas alteraran su patrones de procreation y alimentaci\u00f3n. La sobrevivencia de los cachorros en habitats sub\u00f3ptimos fu\u00e9 muy baja originundo la disminuci\u00f3n gradual de las poblaciones. Durante la \u00faltima d\u00e9cada, en Kure Atoll, el proceso ha sido revertido: la perturbaci\u00f3n humana en las playas ha disminuido y los lugares tradicionales de procreaci\u00f3n y alimentaci\u00f3n ban sido reestablecidos. Subsecuentemente, los altos indices de sobreviuencia de las focas j\u00f3venes, aparejados con dos exitosos programs para acrecentar los cachorros hembra, ban producido cambios dram\u00e1ticos en la composici\u00f3n, en edad y sexo, de la poblaci\u00f3n. Basado en estos cambios, lapoblaci\u00f3n de la foca de Hawai en Kure Atoll deberia de empezar a incrementatse pronto. Los cambios aparentemente peque\u00f1os en actividudes vitales como la alimentaci\u00f3n y la reproducci\u00f3n pueden tener grandes consecuencias demogr\u00e1ficas Por lo tanto, el monitoreo de las especies en peligro debe de incluir datos sobre el uso del habitat y la composici\u00f3n en cuanto a la edad y el sexo asi como c\u00e1lculos estimudos sobre la aburuiancia.", 
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    "title": "Demographic Consequences of Changed Pupping and Hauling Sites of the Hawaiian Monk Seal", 
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    "publication_date": "1990-11-30", 
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