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Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling
Published on: July 4, 2007
A Bioenergetics Approach to Understanding the Population Consequences of Disturbance: Elephant Seals as a Model
Daniel P Costa1, Lisa Schwarz2, Patrick Robinson3
1Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA, 95060, USA. costa@ucsc.edu.
Abstract:
Using long-term empirical data, we developed a complete population consequences of acoustic disturbance (PCAD) model and application for northern elephant seals. We assumed that the animals would not successfully forage while in a 100-km-diameter disturbance region within their foraging and transit paths. The decrease in lipid gain due to exposure was then translated to changes in birth rate and pup survival. Given their large foraging range, elephant seals were resilient to such a disturbance, showing no population-level effects. However, similar track analysis showed that given their more coastal nature, California sea lions were within a 25-km-diameter region of disturbance more often.
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