Complex interplay between intrinsic and extrinsic drivers of long-term survival trends in southern elephant seals |
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Authors: | Siobhan C de Little Corey JA Bradshaw Clive R McMahon Mark A Hindell |
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Institution: | (1) School for Environmental Research, Charles Darwin University, Darwin, Northern Territory, 0909, Australia;(2) Antarctic Wildlife Research Unit, School of Zoology, University of Tasmania, Private Bag 05, Hobart, Tasmania, 7001, Australia |
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Abstract: | Background Determining the relative contribution of intrinsic and extrinsic factors to fluctuations in population size, trends and demographic
composition is analytically complex. It is often only possible to examine the combined effects of these factors through measurements
made over long periods, spanning an array of population densities or levels of food availability. Using age-structured mark-recapture
models and datasets spanning five decades (1950–1999), and two periods of differing relative population density, we estimated
age-specific probabilities of survival and examined the combined effects of population density and environmental conditions
on juvenile survival of southern elephant seals at Macquarie Island. |
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