Supplementary feeding restructures urban bird communities

Galbraith Josie A.; Beggs Jacqueline R.; Jones Darryl N.Stanley Margaret C.

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Supplementary feeding restructures urban bird communities

机译：Supplementary feeding restructures urban bird communities

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Food availability is a primary driver of avian population regulation. However, few studies have considered the effects of what is essentially a massive supplementary feeding experiment: the practice of wild bird feeding. Bird feeding has been posited as an important factor influencing the structure of bird communities, especially in urban areas, although experimental evidence to support this is almost entirely lacking. We carried out an 18-mo experimental feeding study at 23 residential properties to investigate the effects of bird feeding on local urban avian assemblages. Our feeding regime was based on predominant urban feeding practices in our region. We used monthly bird surveys to compare avian community composition, species richness, and the densities of local species at feeding and nonfeeding properties. Avian community structure diverged at feeding properties and five of the commonest garden bird species were affected by the experimental feeding regime. Introduced birds particularly benefitted, with dramatic increases observed in the abundances of house sparrow (Passer domesticus) and spotted dove (Streptopelia chinensis) in particular. We also found evidence of a negative effect on the abundance of a native insectivore, the grey warbler (Gerygone igata). Almost all of the observed changes did not persist once feeding had ceased. Our study directly demonstrates that the human pastime of bird feeding substantially contributes to the structure of avian community in urban areas, potentially altering the balance between native and introduced species.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2015年第20期|E2648-E2657|共10页
作者
Galbraith Josie A.; Beggs Jacqueline R.; Jones Darryl N.Stanley Margaret C.;
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作者单位

Univ Auckland, Sch Biol Sci, Ctr Biodivers & Biosecur, Auckland, New Zealand;

Griffith Univ, Environm Futures Res Inst, Nathan, Qld 4111, Australia;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
avian ecology; community composition; garden birds; human interactions; wildlife feeding;

Supplementary feeding restructures urban bird communities

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