Urban specialization reduces habitat connectivity by a highly mobile wading bird

Movement Ecology

Claire S. Teitelbaum¹  Sonia Altizer¹  Richard J. Hall²  Jeffrey Hepinstall-Cymerman³  Anjelika Kidd-Weaver⁴  Sonia M. Hernandez⁵ 

[1] Odum School of Ecology, University of Georgia, Athens, GA, USA;Odum School of Ecology, University of Georgia, Athens, GA, USA;Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, USA;Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA, USA;Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA, USA;Present address: College of Agriculture, Forestry and Life Sciences, Clemson University, Clemson, SC, USA;Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA, USA;Southeastern Cooperative Wildlife Disease Study, College of Veterinary Medicine, University of Georgia, Athens, GA, USA;

关键词: Eudocimus albus;    Connectivity;    Habitat specialization;    Network;    Nomadism;    Urbanization;    Wildlife;   

DOI  :  10.1186/s40462-020-00233-7

来源: Springer

【 摘 要 】

BackgroundMobile animals transport nutrients and propagules across habitats, and are crucial for the functioning of food webs and for ecosystem services. Human activities such as urbanization can alter animal movement behavior, including site fidelity and resource use. Because many urban areas are adjacent to natural sites, mobile animals might connect natural and urban habitats. More generally, understanding animal movement patterns in urban areas can help predict how urban expansion will affect the roles of highly mobile animals in ecological processes.MethodsHere, we examined movements by a seasonally nomadic wading bird, the American white ibis (Eudocimus albus), in South Florida, USA. White ibis are colonial wading birds that forage on aquatic prey; in recent years, some ibis have shifted their behavior to forage in urban parks, where they are fed by people. We used a spatial network approach to investigate how individual movement patterns influence connectivity between urban and non-urban sites. We built a network of habitat connectivity using GPS tracking data from ibis during their non-breeding season and compared this network to simulated networks that assumed individuals moved indiscriminately with respect to habitat type.ResultsWe found that the observed network was less connected than the simulated networks, that urban-urban and natural-natural connections were strong, and that individuals using urban sites had the least-variable habitat use. Importantly, the few ibis that used both urban and natural habitats contributed the most to connectivity.ConclusionsHabitat specialization in urban-acclimated wildlife could reduce the exchange of propagules and nutrients between urban and natural areas, which has consequences both for beneficial effects of connectivity such as gene flow and for detrimental effects such as the spread of contaminants or pathogens.

【 授权许可】

CC BY