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St Helena Plover (Charadrius sanctaehelenae) - Wiki
| 제목: | St Helena Plover (Charadrius sanctaehelenae) - Wiki
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촬영일: 2007:10:01 17:44:39
등록시간: 2007:10:01 17:48:30
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St. Helena Plover
From Wikipedia, the free encyclopedia
[Photo] St Helena Plover (Charadrius sanctaehelenae). From Birdlife International Saint Helena Plover (Charadrius sanctaehelenae) | Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License". |
The Saint Helena Plover, Charadrius sanctaehelenae, locally known as Wirebird due to its thin legs, is a small wader endemic to the island of Saint Helena. Kittlitz's Plover is the St. Helena bird's closest relative.
The bird was first mentioned in 1638, and is the national bird of Saint Helena, featured on the island's coat of arms.
This plover is resident all year on the open areas of Saint Helena, and it is thought that the widespread deforestation on the island, while generally harmful for the island's ecosystem, has in fact benefitted this particular species, since it lives in open clearings in the forest.
Status and conservation
St. Helena Plover numbers have been fluctuating, but in general the trend was downward since at least the 1970s. Feral cats and accidentally introduced rats, as well as the introduced Common Mynas which eat the eggs, are believed to be play a significant role in the decline of this species' population.
A census in 1988/89 recorded 450 adult birds, although it subsequently sharply declined from causes not fully understood and marked short-term fluctuations. Since 1998, its numbers stood at about 340 adult individuals. Classified as Endangered by the IUCN, it was downlisted to Vulnerable in 2004, as its numbers had apparently stabilized.
However, there was another sharp drop in numbers since then, which may be continuing. Only some 200-220 adult birds are believed to remain. The reasons remain still elusive, although it is noted that there has been an increase in off-road vehicle use and a decline in removing feral and neutering domestic cats in recent years. Construction activity has apparently dispersed some of the smaller subpopulations. The planned Saint Helena Airport would also destroy one of the major patches of remaining habitat, especially as other grassland is now slated for reforestation to aid recovery of the island's ecosystem. As a consequence of its dire status and uncertain prospects, the St. Helena Plover is uplisted to Critically Endangered with extinction in the 2007 IUCN Red List. There are currently projects underway led by the RSPB to monitor the birds and try to stop their decline.
http://en.wikipedia.org/wiki/St._Helena_Plover
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