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Context-dependent niche variation and fitness consequences in California sea lions


Abstract Niche variation among sexes and life stages within a population has been documented in many species, yet few studies have investigated niche variation within demographic groups or across ecological contexts. We examined the extent to which pregnant California sea lions (Zalophus californianus) at each of three breeding colonies target alternative prey resources and habitats. The three colonies are distributed across distinct regions of the Gulf of California, Mexico and have divergent population dynamics. We compared the nature of niche variation among colonies and investigated the fitness consequences of different foraging strategies within each colony. We analyzed the δ13C and δ15N values from fur collected from 206 su... (more)
Created Date 2013
Contributor Crawford, Tara Gancos (Author) / Gerber, Leah R (Advisor) / Ogle, Kiona (Committee member) / Kurle, Carolyn M (Committee member) / Arizona State University (Publisher)
Subject Ecology / Animal behavior / Body condition index / California sea lions / Ecological niche / Foraging / Gulf of California / Stable isotope analysis
Type Masters Thesis
Extent 57 pages
Language English
Copyright
Reuse Permissions All Rights Reserved
Note M.S. Biology 2013
Collaborating Institutions Graduate College / ASU Library
Additional Formats MODS / OAI Dublin Core / RIS


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Description Dissertation/Thesis