Justification This species has a very large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be stable, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is very large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Family/Sub-family Hydrobatidae

Species name author (Swinhoe, 1867)

Taxonomic source(s) AERC TAC (2003), Brooke (2004), Cramp and Simmons (1977-1994), Dowsett and Forbes-Watson (1993), Sibley and Monroe (1990, 1993)

Synonyms Hydrobates monorhis Christidis and Boles (2008)

Identification

Population estimate

Population trend

Range estimate (breeding/resident)

Country endemic?

100,000

unset

-

No

Range & population The species breeds on Verkhovsky Island (7,500 pairs), south of Vladivostok, Russia, and Japan (a minimum of 1,000 pairs). There are little known populations in China, North Korea and South Korea, and records suggest breeding may possibly occur in the North Atlantic. In winter, it migrates south and west to the northern Indian Ocean.

Important Bird Areas Click here to view map showing IBAs where species is recorded and triggers any of the IBA criteria.

Threats Threats to the main breeding colony on Verkhovsky Island include predation by crows Corvidae and migrating owls Strigidae.

Conservation measures underway The main breeding colony on Verkhovsky island has been protected since 1984 which has stopped disturbance of nests by tourists.

References Brooke 2004.

Text account compilers Stuart Butchart (BirdLife International), Jonathan Ekstrom (BirdLife International), Sally Fisher (BirdLife International), Matt Harding (BirdLife International), Nic Peet (BirdLife International)

IUCN Red List evaluators Jeremy Bird (BirdLife International), Stuart Butchart (BirdLife International)

Recommended citation BirdLife International (2009) Species factsheet: Oceanodroma monorhis. Downloaded from http://www.birdlife.org on 9/2/2010

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

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