Tuesday, January 5, 2016

Urban areas reduce native wildlife biodiversity


    (Big eared townsend bat, Wikipedia, image in public domain)

Studies have shown that some wildlife species just do not adapt to urbanized areas. Marchetti (2006) and Ritzi (2004) found that there are more native fish species the farther away from urban areas, and Ordenana (2010) showed that many carnivore species decline nearer to cities. A study just published in Urban Naturalist (No. 8, 2015) supports these observations and concluded that while a few bat species can survive in urban zones, there are many more that just don’t go there. In their paper entitled Bat Species Diversity at an Urban-Rural Interface: Dominance by One Species in an Urban Area, Damm, Sparks and Whitaker (2015) determine that while Northern Long-eared Bats were caught in mist nets in urban Indianopolis, Indiana; that others include Tri-colored Bats and Little Brown Bats were negatively correlated the closer they sampled next to the urban core. They conclude that bat-species richness may be connected to specific roosting and foraging requirements, and the possible negative influence of abundant roadways.

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