Abstract
Global urbanization is rapidly increasing, yet the prevalence of single order and time point studies likely miss important temporal effects of urbanization on entire communities. We studied three sites along a rural–urban gradient in the Seattle metropolitan area with three sampling periods from 2009–2011 to examine how arthropod communities respond to increasing levels of urbanization in a similar habitat type through time. Consistent with previous studies, urban areas contained altered environmental conditions relevant for litter arthropods, and arthropod biodiversity decreased with urbanization. However, urban arthropod biodiversity was not influenced by environmental measures, supporting the idea of an “urban-filter”. Urbanization was not a factor influencing how communities responded to the effect of time, suggesting that other factors (e.g. disturbance) may ultimately be more important for determining patterns of biodiversity through time in urban areas. Finally, our study illustrates urbanization forces can structuring entire arthropod communities similarly through time, having important consequences for our understanding of urbanization’s temporal effects and indirect influence on community interactions and ecosystem processes. As the effects of urbanization will inevitably vary through time, we suggest that multiple time point studies are required to increase our ability to accurately describe arthropod community responses to increasing urbanization.
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Acknowledgments
We thank the M.J. Murdock Charitable Trust and Seattle University College of Science and Engineering for funding support, and King County Parks Department, Seattle Parks and Recreation Department, and Seattle University Grounds Department for permission to study Cougar Mountain, Seward Park, and the Seattle University campus. We also thank our colleagues in the SUCCOTASH lab, especially John Vincent, Lindsey Youngquist, and Ann Frost for technical and field assistance.
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Van Nuland, M.E., Whitlow, W.L. Temporal effects on biodiversity and composition of arthropod communities along an urban–rural gradient. Urban Ecosyst 17, 1047–1060 (2014). https://doi.org/10.1007/s11252-014-0358-z
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DOI: https://doi.org/10.1007/s11252-014-0358-z