e-journal

Urbanization and the more-individuals hypothesis

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Summary
1. Urbanization is a landscape process affecting biodiversity world-wide. Despite many urban–
rural studies of bird assemblages, it is still unclear whether more species-rich communities have
more individuals, regardless of the level of urbanization. The more-individuals hypothesis assumes
that species-rich communities have larger populations, thus reducing the chance of local extinctions.
2. Using newly collated avian distribution data for 1 km2 grid cells across Florence, Italy,weshowa
significantly positive relationship between species richness and assemblage abundance for the whole
urban area. This richness–abundance relationship persists for the 1 km2 grid cells with less than50%
of urbanized territory, as well as for theremaining gridcells, withnosignificant difference in the slope
of the relationship. These results support the more-individuals hypothesis as an explanation of patternsinspeciesrichness,
alsoinhumanmodifiedandfragmentedhabitats.
3. However, the intercept of the species richness–abundance relationship is significantly lower for
highly urbanized grid cells. Our study confirms that urban communities have lower species richness
but counters the common notion that assemblages in densely urbanized ecosystems have more individuals.
In Florence, highly inhabited areas show fewer species and lower assemblage abundance.
4. Urbanized ecosystems are an ongoing large-scale natural experiment which can be used to test
ecological theories empirically.

Key-words: animal diversity, conservation biology, species–people coexistence, trees, urban ecosystems

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Ketersediaan

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Informasi Detail

Judul Seri

Journal of Animal Ecology

No. Panggil

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Penerbit

London : British Ecological Society., 2010

Deskripsi Fisik

Journal of Animal Ecology 2010, 79, 366–371

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

BIOLOGI

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

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