Post by surroundx on Jan 24, 2017 10:55:04 GMT
Scientific Name: Isophya boldyrevi
Species Authority: Miram, 1938
Common Name(s):
English – Boldyrev's Plump Bush-cricket
Taxonomic Source(s): Eades, D.C., Otte, D., Cigliano, M.M. and Braun, H. 2016. Orthoptera Species File. Version 5.0/5.0. Available at: Orthoptera.SpeciesFile.org.
Assessment Information [top]
Red List Category & Criteria: Critically Endangered (Possibly Extinct) B2ab(iii,iv,v) ver 3.1
Year Published: 2016
Date Assessed: 2015-12-06
Assessor(s): Chobanov, D.P., Hochkirch, A., Iorgu, I.S., Ivkovic, S., Korsunovskaya, O., Kristin, A., Lemonnier-Darcemont, M., Pushkar, T., Sirin, D., Skejo, J. Skejo, Szovenyi, G., Vedenina, V. & Willemse, L.P.M.
Reviewer(s): Kleukers, R. & García, M.
Contributor(s): Danielczak, A.
Facilitator/Compiler(s): Nieto, A.
Justification:
Global and European regional assessment: Critically Endangered (CE)
EU 28 regional assessment: Not Evaluated (NE)
Boldyrev's Plump Bush-cricket is known from two localities in a small range and has not been observed in the wild since 1915. Recent searches for this species were not successful (O. Korsunovskaya pers. comm. 2015). Its area of occupancy (AOO) is 8 km², but it is not clear if the species still exists. The species is present at only one location, and a continuing decline in the extent and quality of habitat, the number of subpopulations and the number of mature individuals is assumed. It is therefore assessed as Critically Endangered (CR) and may possibly be extinct.
Date last seen: 1915
Geographic Range [top]
Range Description: Boldyrev's Plump Bush-cricket is only known from the Volga Upland in the region of Saratov, where it has been reported from two localities (Bey-Bienko 1954). Its extent of occurrence (EOO) is estimated to be c. 300 km² and its area of occupancy (AOO) is c. 8 km². However, despite recent searches, the species has not been found again.
Countries occurrence:
Native:
Russian Federation (South European Russia)
Additional data:
♦ Estimated area of occupancy (AOO) - km2: 8
♦ Lower elevation limit (metres): 100
♦ Upper elevation limit (metres): 300
Range Map: Click here to open the map viewer and explore range.
Population [top]
Population:
Recent searches for this species were not successful (O. Korsunovskaya pers. comm. 2015). It is thus assumed that the species must be very rare and the population is probably declining.
Current Population Trend: Decreasing
Additional data:
Habitat and Ecology [top]
Habitat and Ecology: The species was found in mesic grass-herbaceous vegetation at the forest edge, at altitudes between 100 - 300 m Asl.
Systems: Terrestrial
Use and Trade [top]
Use and Trade:
This species is not utilised.
Threats [top]
Major Threat(s):
The transformation of its habitat into farmland is most likely a major threat to this species. Based on this threat, the species occurs only at one location.
Conservation Actions [top]
Conservation Actions:
There are no conservation actions in place for this species, and it is not known to occur in protected areas. Research is needed to clarify if the species is still extant and to study its ecology and threats. An area-based management plan would be necessary after clarifying its population trend and threats.
Source: www.iucnredlist.org/details/summary/68398568/0
Species Authority: Miram, 1938
Common Name(s):
English – Boldyrev's Plump Bush-cricket
Taxonomic Source(s): Eades, D.C., Otte, D., Cigliano, M.M. and Braun, H. 2016. Orthoptera Species File. Version 5.0/5.0. Available at: Orthoptera.SpeciesFile.org.
Assessment Information [top]
Red List Category & Criteria: Critically Endangered (Possibly Extinct) B2ab(iii,iv,v) ver 3.1
Year Published: 2016
Date Assessed: 2015-12-06
Assessor(s): Chobanov, D.P., Hochkirch, A., Iorgu, I.S., Ivkovic, S., Korsunovskaya, O., Kristin, A., Lemonnier-Darcemont, M., Pushkar, T., Sirin, D., Skejo, J. Skejo, Szovenyi, G., Vedenina, V. & Willemse, L.P.M.
Reviewer(s): Kleukers, R. & García, M.
Contributor(s): Danielczak, A.
Facilitator/Compiler(s): Nieto, A.
Justification:
Global and European regional assessment: Critically Endangered (CE)
EU 28 regional assessment: Not Evaluated (NE)
Boldyrev's Plump Bush-cricket is known from two localities in a small range and has not been observed in the wild since 1915. Recent searches for this species were not successful (O. Korsunovskaya pers. comm. 2015). Its area of occupancy (AOO) is 8 km², but it is not clear if the species still exists. The species is present at only one location, and a continuing decline in the extent and quality of habitat, the number of subpopulations and the number of mature individuals is assumed. It is therefore assessed as Critically Endangered (CR) and may possibly be extinct.
Date last seen: 1915
Geographic Range [top]
Range Description: Boldyrev's Plump Bush-cricket is only known from the Volga Upland in the region of Saratov, where it has been reported from two localities (Bey-Bienko 1954). Its extent of occurrence (EOO) is estimated to be c. 300 km² and its area of occupancy (AOO) is c. 8 km². However, despite recent searches, the species has not been found again.
Countries occurrence:
Native:
Russian Federation (South European Russia)
Additional data:
♦ Estimated area of occupancy (AOO) - km2: 8
♦ Lower elevation limit (metres): 100
♦ Upper elevation limit (metres): 300
Range Map: Click here to open the map viewer and explore range.
Population [top]
Population:
Recent searches for this species were not successful (O. Korsunovskaya pers. comm. 2015). It is thus assumed that the species must be very rare and the population is probably declining.
Current Population Trend: Decreasing
Additional data:
Habitat and Ecology [top]
Habitat and Ecology: The species was found in mesic grass-herbaceous vegetation at the forest edge, at altitudes between 100 - 300 m Asl.
Systems: Terrestrial
Use and Trade [top]
Use and Trade:
This species is not utilised.
Threats [top]
Major Threat(s):
The transformation of its habitat into farmland is most likely a major threat to this species. Based on this threat, the species occurs only at one location.
Conservation Actions [top]
Conservation Actions:
There are no conservation actions in place for this species, and it is not known to occur in protected areas. Research is needed to clarify if the species is still extant and to study its ecology and threats. An area-based management plan would be necessary after clarifying its population trend and threats.
Source: www.iucnredlist.org/details/summary/68398568/0