Biology
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Given the geographic and temporal elusiveness of the São Tomé fiscal, it is no surprise that very little is known about this species. Nonetheless, shrikes in general are renowned for their aggressive predatory behaviour (4) (6). For instance, a number of shrike species, including the common fiscal, impale their prey on thorns for later consumption. Most species within this family feed on insects but some are known to also take small birds, lizards and rodents (3) (4).
Conservation
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With patches of primary forest protected within Obo Natural Park on São Tomé, it is hoped that habitat suitable for the São Tomé fiscal will be preserved for the future. However, the benefit this species derives from this protected area is unclear as its specific ecological requirements are still so poorly understood (2) (7). It is therefore paramount that further research is carried out to develop a greater understanding of this species' ecology, as well as its population size and dynamics. This information will be invaluable in determining which areas should be prioritised for protection. Unfortunately, as with many developing countries, human and financial resources for conservation are limited and consequently, at this stage, law enforcement is non-existent. Nonetheless, proposals have been made to actively manage and protect these areas, as well as to list the São Tomé fiscal as a protected species under national law. This is something that will become more and more crucial as development begins to encroach on the remnant patches of primary forest favoured by the São Tomé fiscal and many other endemic species (2).
Description
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For the best part of the 20th century the São Tomé fiscal was thought to be extinct, but in 1990, the continued existence of this long-tailed forest shrike was confirmed after the sighting of a single bird (2). In appearance it is very similar to the much more abundant and Africa-wide common fiscal, Lanius collaris, with a predominately black head, nape, upperparts and tail (2) (3). However, whereas the common fiscal has bold white underparts and a white wingbar (3), the corresponding attributes of the São Tomé fiscal are unmistakeably yellow tinged (2). In common with its continental relative, and indeed all shrikes, it has a hooked bill with a tooth-like point (4).
Habitat
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All observations of this species have been made in lowland primary forest with very little undergrowth and mostly bare ground (2) (5).
Range
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The São Tomé fiscal is endemic to the island of São Tomé in the Gulf of Guinea, 255 kilometres off the coast of Gabon (2) (5).
Status
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Classified as Critically Endangered (CR) on the IUCN Red List (1).
Threats
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Forest clearance began on São Tomé in the late 15th century, when early colonisers made space for the cultivation of sugar cane. In the 1800s the rate of deforestation accelerated dramatically, first with the production of coffee and later with cocoa. At one stage in the early 20th century, São Tomé was the world's largest producer of cocoa, with an estimated 42 percent of the island being devoted to its production. The crash in the price of cocoa, and the island's conversion to independence in 1975, put a stop to forest clearance but not before almost all the island's lowland primary forest had been destroyed (5). The impact of this large scale loss of habitat for the São Tomé fiscal is plain to see, with its population estimated in 2000 to be less than 50 individuals (2). While much of the cultivated land has now reverted back to secondary forest, the São Tomé fiscal appears to be restricted to the tiny remaining areas of lowland primary forest. Fortunately, because these areas are so remote, they are not under immediate threat, but with road development opening up more and more land on the island, this could very easily change in the future. Furthermore, there is high probability that introduced animals such as rats, monkeys, weasels and civets have had a negative impact on nesting birds, including the São Tomé fiscal (2) (5).
São Tomé fiscal
provided by wikipedia EN
The São Tomé fiscal (Lanius newtoni), or Newton's fiscal, is a species of bird in the family Laniidae. It is endemic to São Tomé Island, São Tomé and Príncipe. It is 20 to 21 centimeters long. The bird is black above with a white shoulder-scapular bar.[2] The São Tomé fiscal has a pale yellow chin, breast, belly, flanks vent and under tail.[2] Its graduated tail has all black central tail feathers and an increasing amount of white on outer web from inner to outer tail feathers.[2] The Lanius newtoni has a clear voice with a whistle tiuh tiuh often repeated and metallic tsink tsink audible over a long distance.[2]
The species lives on the island of São Tomé and is usually found under closed canopy. Its natural habitats are subtropical or tropical moist lowland forests and subtropical or tropical moist montane forests.[2]
Status
The São Tomé fiscal is a very rare bird. There were records of sightings in 1888 and again in 1928. Another individual was sighted in 1990 near the source of the Rio Xufexufe, and a number of birds have been spotted since then. All sightings have been in primary forest with rocky areas but little undergrowth, sometimes on low ridges or beside watercourses, and always below 1,400 m (4,600 ft). This type of habitat is decreasing as forests are cut to create coffee and cocoa plantations, and the building of new hydropower plants are another possible threat, even though it is a protected area (Parque Natural Obô de São Tomé).[1][3] It is considered to be a critically endangered bird by the International Union for Conservation of Nature.[1]
References
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São Tomé fiscal: Brief Summary
provided by wikipedia EN
The São Tomé fiscal (Lanius newtoni), or Newton's fiscal, is a species of bird in the family Laniidae. It is endemic to São Tomé Island, São Tomé and Príncipe. It is 20 to 21 centimeters long. The bird is black above with a white shoulder-scapular bar. The São Tomé fiscal has a pale yellow chin, breast, belly, flanks vent and under tail. Its graduated tail has all black central tail feathers and an increasing amount of white on outer web from inner to outer tail feathers. The Lanius newtoni has a clear voice with a whistle tiuh tiuh often repeated and metallic tsink tsink audible over a long distance.
The species lives on the island of São Tomé and is usually found under closed canopy. Its natural habitats are subtropical or tropical moist lowland forests and subtropical or tropical moist montane forests.
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