| Kingdom | Phylum | Class | Order | Family |
|---|---|---|---|---|
| ANIMALIA | CHORDATA | AVES | PASSERIFORMES | CORVIDAE |
| Scientific Name: | Garrulus lidthi | |||
| Species Authority: | Bonaparte, 1851 | |||
Common Name/s:
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| Red List Category & Criteria: | Vulnerable C2a(ii) ver 3.1 | ||||||||||||||||||
| Year Published: | 2008 | ||||||||||||||||||
| Assessor/s: | BirdLife International | ||||||||||||||||||
| Reviewer/s: | Butchart, S., Bird, J., Crosby, M. | ||||||||||||||||||
| Contributor/s: | Kominami, Y. | ||||||||||||||||||
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Justification: This jay has a small population which is suspected to have declined, possibly as a result of increased levels of predation. It therefore qualifies as Vulnerable. If surveys reveal that the population is now increasing following predator control and forest regeneration, the species may warrant downlisting. |
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| History: |
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| Range Description: | Garrulus lidthi is endemic to the islands of Amami-ooshima and Kakeroma-jima, part of the Nansei Shoto Islands, Japan. It was previously common in the central mountains of Toku-no-shima but is now extinct there. Its population was estimated at c.5,800 birds in the 1970s, but it declined through to the 1990s. Owing to alien predator control and natural forest regeneration it may have begun to increase since 20001. |
| Countries: |
Native:
Japan
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| Range Map: | Click here to open the map viewer and explore range. |
| Population: | Nishidi (1974) in Brazil (1991) |
| Population Trend: |
Decreasing
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| Habitat and Ecology: | It occurs from sea-level into the hills, in subtropical evergreen broadleaved forest, coniferous forest, and in woodland around cultivation and human habitation, showing a significant preference for mature forest. It feeds on and caches the acorns of Castanopsis cuspidate, Quercus glauca and other oaks when they are available; if this food supply is exhausted birds will feed in agricultural fields1. Sweet potato, insects, seeds fruits, reptiles, including Okinawa pit-viper Trimeresurus flavoviridis, and maybe birds are also included in its diet. It forages in trees and on the ground. Breeding takes place from late January or early February until May. |
| Systems: | Terrestrial |
| Major Threat(s): | A high proportion of nests are predated by crows and mammals and the small Indian mongoose Herpestes javanicus has been reported to prey on young birds. However, it is not known whether this apparently increased predation pressure will have a long-term effect on the population. The numbers of Large-billed Crow Corvus macrorhynchos on Amami-ooshima have recently increased, probably because of increased garbage disposal on the island. The effect of logging on its population is probably relatively small. |
| Conservation Actions: |
Conservation Actions Underway It is legally protected in Japan. Yuwandake on Amami-ooshima was established as a National Wildlife Protection Area, mainly for the conservation of this species and Amami Thrush Zoothera major. Several surveys and ecological studies have been completed. Introduced small Indian mongoose has been controlled within its range in recent years and as a result the species may now be increasing. Conservation Actions Proposed Conserve and restore remaining areas of mature forest on Amami-ooshima. Provide nest-boxes in areas where there is a shortage of natural nest-holes. Control alien predators on Amami-ooshima. Survey the central mountains of Tokunoshima, where it was reported in the 1920s. Investigate the potential for reintroduction on Tokunoshima. |
| Citation: | BirdLife International 2008. Garrulus lidthi. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. <www.iucnredlist.org>. Downloaded on 24 May 2012. |
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