NDLI: Influence of human population size and the built environment on avian assemblages in urban green spaces

Content Provider	Springer Nature Link
Author	Latta, Steven C. Musher, Lukas J. Latta, Krista N. Katzner, Todd E.
Copyright Year	2012
Abstract	While studies of how habitat patch dynamics structures avian communities in urban environments has received some attention, there is considerably less known of how the built environment and human population size may influence the structuring of urban bird communities. We investigated bird populations in Pittsburgh, Pennsylvania (U.S.A.) through replicated point count surveys of breeding birds in 50 parks and cemeteries of varying sizes. We counted 4,435 individual birds in 441 counts. Of the 61 species detected, 27 were rare (detected at <8 points). Migratory species accounted for 46.1 % of all individuals, while 23.2 % of all individuals were of introduced species. Species richness increased significantly with green area size, as did the number of rare species. Species diversity decreased significantly with an increase in the proportion of individuals of introduced species; in particular, cavity nesters were less abundant when introduced species were present. Elements of the built urban environment including commercial development and transportation corridors were associated with significant reductions in park-wide species richness, mean number of species per point, and mean number of individual birds recorded per point. Human population size was positively related to increased numbers of individuals of introduced species, but a lower mean number of species per point. Ours is among the first to identify specific relationships between avian population characteristics and human population size, as few other studies have specifically incorporated human population size into a local, fine grain study design. Our data suggest that human population size is an important parameter that can be measured independently of characteristics of the built environment and the physical characteristics of the park itself as a correlate of avian diversity and abundance. Our study points to a variety of trade-offs needed to manage habitat for birds in urban settings.
Starting Page	463
Ending Page	479
Page Count	17
File Format	PDF
ISSN	10838155
Journal	Urban Ecosystems
Volume Number	16
Issue Number	3
e-ISSN	15731642
Language	English
Publisher	Springer US
Publisher Date	2012-12-15
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biotic homogenization Introduced Exotic Human population Breeding birds Landscape Urban Ecology Environmental Management Ecology Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Ecology Urban Studies

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