NDLI: Factors influencing expanded use of urban marine habitats by foraging wading birds

Content Provider	Springer Nature Link
Author	McKinney, Richard A. Raposa, Kenneth B.
Copyright Year	2012
Abstract	Urban marine habitats are often utilized by wildlife for foraging and other activities despite surrounding anthropogenic impact or disturbance. However little is known of the ecological factors that determine habitat value of these and other remnant natural habitats. We examined the preferential use of urban marine habitats in a northeast US estuary to try to elucidate the factors driving enhanced foraging activity at these sites. Using a bioenergetic model, we compared energy intake to energy expenditure and examined differences in behavior and foraging success of great egrets Ardea alba at three urban and three rural salt marshes in Narragansett Bay, Rhode Island USA. Mean per site available nekton energy averaged 4.44 ± 0.97 GJ site$^{−1}$ and was significantly higher at urban than at rural sites. While energy expenditure by birds was similar across all sites, mean strike and prey capture rate were significantly greater at urban sites, and 70.1 ± 12.2 % of strikes by egrets at urban sites were successful. Egrets foraging at urban sites consumed significantly more energy (23.2 ± 6.62 W bird$^{−1}$) than those at rural sites. Model results indicated a net energy gain by egrets foraging at urban sites, versus a net energy loss at rural sites. Our results may help explain previously observed increases in the numbers of egrets foraging at urban marine habitats, and help provide input into decisions about the extent to which these areas should be considered for restoration or protection.
Starting Page	411
Ending Page	426
Page Count	16
File Format	PDF
ISSN	10838155
Journal	Urban Ecosystems
Volume Number	16
Issue Number	3
e-ISSN	15731642
Language	English
Publisher	Springer US
Publisher Date	2012-11-11
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ardeidae Bioenergetic model Human disturbance Narragansett Bay Urban marine habitats Wading birds Urban Ecology Environmental Management Ecology Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Ecology Urban Studies

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