Data Zone
Taxonomic note
As part of their overhaul of the Locustellidae (see below) Alström et al. (2018) introduced the generic name Helopsaltes to cover the monophyletic group of Locustella warbler species ochotensis, pleskei, certhiola, pryeri, fasciolata and amnicola (del Hoyo and Collar 2016). They found no morphological diagnostic characters, but identified a clear difference in voice.
Before this genus change, Locustella fasciolata and L. amnicola (del Hoyo and Collar 2016) were previously treated as a single species, L. fasciolata, following AERC TAC (2003), Cramp et al. (1977-1994) and Sibley and Monroe (1990, 1993). Although described as a species, often treated as a subspecies of H. fasciolata, but genetic distinctiveness rather strong (Alström et al. 2011, Drovetski et al. 2004, Drovetski et al. 2015); and while it differs only subtly in morphology, with summer birds having browner, less olive-green upperparts (1), brown vs grey ear-coverts (ns1), reduced or no grey on dull olive-buff breast and flanks (1), warm fulvous-brown vs pale brown lower flanks to vent (1) and slightly shorter wing and tarsus (allow 1), vocally fairly distinctive, with slower (2), longer (2) song phrases (Boesman 2016). However, review of characters suggests distinctiveness of plumage characters not always consistent (Neufeldt & Netschajew 1977, Neufeldt & Netschajew 1978), and trend in H. fasciolata in NE China towards characters associated with present species (Kennerley & Pearson 2010) indicates more work is needed to confirm this split. Monotypic.
Taxonomic source(s)
Handbook of the Birds of the World and BirdLife International. 2021. Handbook of the Birds of the World and BirdLife International digital checklist of the birds of the world. Version 6. Available at: https://datazone.birdlife.org/userfiles/file/Species/Taxonomy/HBW-BirdLife_Checklist_v6_Dec21.zip.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 2024 | Least Concern | |
| 2016 | Least Concern | |
| 2012 | Not Recognised | |
| 2008 | Not Recognised | |
| 2004 | Not Recognised | |
| 2000 | Not Recognised | |
| 1994 | Not Recognised | |
| 1988 | Not Recognised |
| Migratory status | full migrant | Forest dependency | low |
| Land-mass type | Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence (breeding/resident) | 622,000 km2 | |
| Extent of Occurrence (non-breeding) | 3,930,000 km2 | |
| Severely fragmented? | no | - |
| Estimate | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| Population size | unknown | - | - | - |
| Population trend | stable | - | suspected | - |
| Generation length | 2.12 years | - | - | - |
Population justification: The population is suspected to be stable in the absence of evidence for any declines or substantial threats.
Trend justification: The population is suspected to be stable in the absence of evidence for any declines or substantial threats.
| Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
|---|---|---|---|---|---|---|
| Japan | extant | native | yes | |||
| Russia | extant | native | yes | |||
| Russia (Asian) | extant | native | yes |
| Country/Territory | IBA Name |
|---|---|
| Japan | Lake Furen, On-netou |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Forest | Subtropical/Tropical Mangrove Vegetation Above High Tide Level | suitable | non-breeding |
| Forest | Temperate | suitable | breeding |
| Grassland | Temperate | suitable | breeding |
| Shrubland | Subtropical/Tropical Moist | suitable | non-breeding |
| Shrubland | Temperate | suitable | breeding |
| Wetlands (inland) | Permanent Rivers/Streams/Creeks (includes waterfalls) | suitable | breeding |
| Altitude | Occasional altitudinal limits |
Recommended citation
BirdLife International (2024) Species factsheet: Sakhalin Grasshopper-warbler Helopsaltes amnicola. Downloaded from
https://datazone.birdlife.org/species/factsheet/sakhalin-grasshopper-warbler-helopsaltes-amnicola on 20/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from
https://datazone.birdlife.org/species/search on 20/12/2024.