Post by Melanie on May 5, 2006 15:51:57 GMT
Red List Category & Criteria CR B1ab(iii)+2ab(iii) ver 3.1 (2001)
Year Assessed 2005
Assessor/s Bedjanic, M.
Evaluator/s Clausnitzer, V. & Suhling, F. (Odonata Red List Authority)
Justification Anisogomphus solitaris has not been found since its description more than 30 years ago. It is obviously a rare species. Taxonomically isolated, with no near allies. Due to the considerable deviation in adult and larval characters the species most probably may belong to a new genus. Despite the fact that its type locality is already disturbed stream among tea and rubber estates, the species may be already extinct. It is not present in any of the large odonatological collections from the island made by entomologists in last 50 years (NHM Basle (Switzerland), NMNH - Smithsonian Institution (USA), Lund University (Sweden) and University of Vienna (Austria)). Also it was not found during the assessor's surveys in recent years (1995, 2001 and 2003). Since no really exhaustive odonatological faunistic survey, covering appropriate localities in different seasons, has been made by odonatologists in order to eventually find its remaining populations, the species does not yet qualify under category Extinct. More field research is urgently needed.
Distribution
Country Names Sri Lanka [RE?]
Summary Documentation
System Terrestrial; Freshwater
Major Habitat/s
(terms) 5.1 Wetland - Permanent Rivers/Streams/Creeks
Major Threat/s
(terms) 1 Habitat Loss/Degradation (human induced) (ongoing)
6.3 Pollution (affecting habitat and/or species) - Water pollution (ongoing)
Population Trend
(terms)
Conservation Action/s
(terms) 3.1 Research actions - Taxonomy (needed)
3.2 Research actions - Population numbers and range (needed)
3.3 Research actions - Biology and Ecology (needed)
4.1 Habitat and site-based actions - Maintenance/Conservation (needed)
4.4 Habitat and site-based actions - Protected areas (needed)
Detailed Documentation
Range Endemic to Sri Lanka. The species is known only from the type locality (Rambukpath Oya, Hatton, Central Province).
Population Current population size is unknown, although it is suspected that the species may already be Extinct.
Habitat and Ecology Habitat is described as stream in deep ravine between tea and rubber estates.
Threats The habitat type is under threat. Destruction of primary and secondary rainforests, destruction of forest corridors along streams, pollution and other pressures on streams and rivers in the southwestern and central part of Sri Lanka are the major threats for exceptionally rich endemic dragonfly fauna on the island (Bedjanic 2004).
Conservation Measures Apart from general conservation guidelines, no site specific "single-species-oriented" conservation measures can be proposed for the moment. General guidelines for protection of rich endemic dragonfly fauna of Sri Lanka include: (1) establishment of network of new small protected areas and corridors in the Wet zone; (2) conservation of forest corridors along streams and rivulets outside protected areas in the Wet zone; and (3) effective execution of appropriate nature conservation measures in partly damaged declared protected areas (Bedjanic 2004).
Knowledge on distribution, biology and taxonomy of several endangered endemic dragonfly species from Sri Lanka is very poor or insufficient. In the future special attention should be devoted to the work dealing with taxonomy of larval forms and adults. Serious odonatological faunistic mapping should cover the whole island and should be urgently focused on still preserved and protected areas. Simultaneously also the research of biology and ecology of selected endangered species should be carried out.
As far as species habitat and potential area of occurrence is concerned, the South-western Sri Lanka Rivers and Streams (Ecoregion 172) are included in the prestigious WWF's global 200 list of the earth's most biologically outstanding habitats. The conservation status of the ecoregion is judged as vulnerable (Olson et al. 2000).
Year Assessed 2005
Assessor/s Bedjanic, M.
Evaluator/s Clausnitzer, V. & Suhling, F. (Odonata Red List Authority)
Justification Anisogomphus solitaris has not been found since its description more than 30 years ago. It is obviously a rare species. Taxonomically isolated, with no near allies. Due to the considerable deviation in adult and larval characters the species most probably may belong to a new genus. Despite the fact that its type locality is already disturbed stream among tea and rubber estates, the species may be already extinct. It is not present in any of the large odonatological collections from the island made by entomologists in last 50 years (NHM Basle (Switzerland), NMNH - Smithsonian Institution (USA), Lund University (Sweden) and University of Vienna (Austria)). Also it was not found during the assessor's surveys in recent years (1995, 2001 and 2003). Since no really exhaustive odonatological faunistic survey, covering appropriate localities in different seasons, has been made by odonatologists in order to eventually find its remaining populations, the species does not yet qualify under category Extinct. More field research is urgently needed.
Distribution
Country Names Sri Lanka [RE?]
Summary Documentation
System Terrestrial; Freshwater
Major Habitat/s
(terms) 5.1 Wetland - Permanent Rivers/Streams/Creeks
Major Threat/s
(terms) 1 Habitat Loss/Degradation (human induced) (ongoing)
6.3 Pollution (affecting habitat and/or species) - Water pollution (ongoing)
Population Trend
(terms)
Conservation Action/s
(terms) 3.1 Research actions - Taxonomy (needed)
3.2 Research actions - Population numbers and range (needed)
3.3 Research actions - Biology and Ecology (needed)
4.1 Habitat and site-based actions - Maintenance/Conservation (needed)
4.4 Habitat and site-based actions - Protected areas (needed)
Detailed Documentation
Range Endemic to Sri Lanka. The species is known only from the type locality (Rambukpath Oya, Hatton, Central Province).
Population Current population size is unknown, although it is suspected that the species may already be Extinct.
Habitat and Ecology Habitat is described as stream in deep ravine between tea and rubber estates.
Threats The habitat type is under threat. Destruction of primary and secondary rainforests, destruction of forest corridors along streams, pollution and other pressures on streams and rivers in the southwestern and central part of Sri Lanka are the major threats for exceptionally rich endemic dragonfly fauna on the island (Bedjanic 2004).
Conservation Measures Apart from general conservation guidelines, no site specific "single-species-oriented" conservation measures can be proposed for the moment. General guidelines for protection of rich endemic dragonfly fauna of Sri Lanka include: (1) establishment of network of new small protected areas and corridors in the Wet zone; (2) conservation of forest corridors along streams and rivulets outside protected areas in the Wet zone; and (3) effective execution of appropriate nature conservation measures in partly damaged declared protected areas (Bedjanic 2004).
Knowledge on distribution, biology and taxonomy of several endangered endemic dragonfly species from Sri Lanka is very poor or insufficient. In the future special attention should be devoted to the work dealing with taxonomy of larval forms and adults. Serious odonatological faunistic mapping should cover the whole island and should be urgently focused on still preserved and protected areas. Simultaneously also the research of biology and ecology of selected endangered species should be carried out.
As far as species habitat and potential area of occurrence is concerned, the South-western Sri Lanka Rivers and Streams (Ecoregion 172) are included in the prestigious WWF's global 200 list of the earth's most biologically outstanding habitats. The conservation status of the ecoregion is judged as vulnerable (Olson et al. 2000).
