US-IALE 2018 has ended
Back To Schedule
Wednesday, April 11 • 2:30pm - 2:45pm
HABITAT FRAGMENTATION/CONNECTIVITY: The Traits That Predict Forest Bird Responses to Urbanization Intensity

Sign up or log in to save this to your schedule, view media, leave feedback and see who's attending!

AUTHORS: Grant Paton*, The University of North Carolina at Charlotte; Alexandra Shoffner, Michigan State University; Andrew Wilson, Gettysburg College, Sara Gagné, The University of North Carolina at Charlotte

ABSTRACT: As humans continue moving to urban areas, there is a growing need to understand the effects of urban intensification on native wildlife populations. Forest species in remnant habitat are particularly vulnerable to urban intensification, but the mechanisms behind these effects are poorly understood. The objective of our study was to identify the traits that best explained variation in the responses of forest bird species to urbanization intensity. To do so, we used occurrence data for 58 forest species derived from 16,541 forested point counts from the Second Pennsylvania Breeding Bird Atlas. For each species, we estimated the effect of urbanization intensity on occurrence at each of ten landscape scales, controlling for other measures of landscape heterogeneity, local habitat attributes, and species detectability, using generalized linear models and an information theoretic approach. From these analyses we extracted the largest effect size for urbanization intensity across scales for each species. Effect sizes ranged from -1.49 to 0.90, with a mean ± SE of -0.36 ± 0.49. We then collated data on multiple traits for each species from field guides and published literature. We also collected song traits from species recordings. Trait data will be used as predictors of variation in urbanization intensity effect sizes among species in phylogenetic regression models. Preliminary results indicate that use of nest cavities, clutch size, clutches per year, fledgling success, sociality, frugivory, granivory, lifespan, nesting height, offspring’s duration in nest, omnivory, biparental nest construction, sedentarism, mean song frequency, and song length are positively associated with urbanization intensity effect sizes, whereas foraging height, song frequency range, and territory size are negatively associated. Our results will identify species traits that facilitate or hinder a species’ ability to utilize urban environments. Species with inhibiting traits can then be prioritized in urban conservation programs.

Wednesday April 11, 2018 2:30pm - 2:45pm CDT
Hancock Parlor