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Full-Text Articles in Life Sciences

Scale-Dependent Habitat Use By Fall Migratory Birds: Vegetation Architecture, Floristics, And Geographic Consistency, Jill L. Deppe, John T. Rotenberry Jan 2008

Scale-Dependent Habitat Use By Fall Migratory Birds: Vegetation Architecture, Floristics, And Geographic Consistency, Jill L. Deppe, John T. Rotenberry

Jill L Deppe

Animal habitat selection is a central focus of ecology and conservation biology. Understanding habitat associations in migratory animals is particularly complicated because individuals have variable habitat requirements during the annual cycle, across their geographic range, along migratory routes, and at multiple spatial scales. We studied habitat associations of 16 fall Nearctic–Neotropical migratory land birds at two spatial scales at a stopover site along the northern Yucatan coast to examine scale-dependent habitat use, identify proximate cues shaping birds' distributions, and evaluate similarities in habitat use between our tropical stopover site and temperate sites. We addressed scale-dependent habitat associations in two ...


Simulating The Effects Of Wetland Loss And Inter-Annual Variability On The Fitness Of Migratory Bird Species, Jill L. Deppe, James A. Smith Jan 2008

Simulating The Effects Of Wetland Loss And Inter-Annual Variability On The Fitness Of Migratory Bird Species, Jill L. Deppe, James A. Smith

Jill L Deppe

Long-distance migratory shorebirds require wetland stopover sites where they can forage and deposit sufficient fat to complete their migration and, in the spring, reproduce. Conservation biologists are concerned that continental-scale reductions in wetland availability and quality due to human disturbance, climate change, and natural drought events are negatively impacting these species by eliminating critical stopovers along migratory flyways. We describe an individual-based migration model driven by remotely sensed land surface data, climate data assimilation models, and biological field data to examine the impact of changing environmental conditions on migration routes, temporal patterns, and fitness. We used an evolutionary programming approach ...