Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 352067
Title Relative status of two species of migrant sparrowhawks on Java and Bali, Indonesia
Author(s) Nijman, V.; Germi, F.; Balen, S. van
Source Emu 106 (2006)2. - ISSN 0158-4197 - p. 157 - 162.
Department(s) Wildlife Ecology and Conservation
Publication type Refereed Article in a scientific journal
Publication year 2006
Keyword(s) raptors
Abstract Every autumn thousands of sparrowhawks, mainly the Chinese Sparrowhawk (Accipiter soloensis) and the Japanese Sparrowhawk (A. gularis), migrate from East Asia to western Indonesia. However, the relative abundance of these two species in Indonesia differs between studies, with some reporting Japanese Sparrowhawk being up to ten times more common than Chinese Sparrowhawk, while other studies report the reverse. We assessed the status of these two migrant sparrowhawks on the islands of Java and Bali by comparing four datasets: data from four watch-sites (1992¿2004, 108 days, 7698 birds), general surveys (1980¿2004, 354 days, 578 birds), museum collections (<1820¿1957, eight collections, 274 birds), and the literature (1902¿2004). In the first three datasets, Chinese Sparrowhawk was 2¿10 times more numerous than Japanese Sparrowhawk, and data from the literature tended to support this. There were small but significant differences between the two islands, with Japanese Sparrowhawk being slightly more common on Bali than on Java. Systematic study of all available data on the relative abundance of the two species shows there is no evidence that changes in species composition have occurred
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