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Nesting tree characteristics of heronry birds of urban ecosystems in peninsular India： implications for habitat management

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Current Zoology 2017年第6期63卷 599-605页

作者： Ramesh ROSHNATH palatty allesh sinu Department of Animal Science Central University of Kerala Padannakad Kerala PO 671314 India Department of Ecology and Evolutionary Biology Bioscience West University of Arizona Tucson AZ 85721 USA

Wetland ecosystems, particularly the mangrove forest, are the primary wild habitat of heronry birds. However, urban ecosystems have become a favorite breeding habitat of these birds. To provide inputs into the habitat management for conservation of these birds, we investigated the quantitative and qualitative characteristics of nesting trees of heronry birds in the urban environment of the North Kerala region of peninsular India. Census on nesting trees was done in 3 major microhabitats of the urban ecosystem： avenues of national highways and towns, nonresidential plots, and residential areas apart from the mangrove islets in the peri-urban locality. The study found that 174 trees of 22 species hosted 1,928 heronry bird nests in the urban habitats; mangrove forests, although plentiful in the study area, hosted only about 20% of the total nests encountered in the study. Rain trees Samanea saman （43.7%） were the most available nesting tree. The greatest number of nests and nesting trees were encountered on the roads of urban areas, followed by nonresidential areas and residential areas. The differences in the observed frequencies of nesting trees in 3 microhabitats and in 3 types of roads （national highways 〉 state highways 〉 small pocket road） were significant. Canopy spread, girth size, and quality of the trees predicted the tree selection of the heronry birds in urban environments. Therefore, we recommend proper management and notification of the identified nesting trees as protected sites for the conservation of herorny birds.

关键词： avenue trees heronry management urban ecosystem.

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