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LC
Madeiran Storm-petrel Oceanodroma castro

Justification
This species has an extremely 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). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to 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.

Taxonomic note
Oceanodroma castro (Sibley and Monroe 1990, 1993) has been split into O. castro and O. monteiroi following Bolton et al. (2008).

Distribution and population
Oceanodroma castro breeds in the eastern Atlantic from the Berlengas Islands and the Azores (Portugal), down to Ascension Island and Saint Helena (St Helena to UK), and in the Pacific off eastern Japan, on Kauai, Hawaii (USA) and on the Galapagos Islands (Ecuador) (del Hoyo et al. 1992).

Population justification
Brooke (2004) estimated the global population to number around 150,000 individuals.

Trend justification
The population is suspected to be in decline owing to predation by invasive species and unsustainable levels of exploitation.

Ecology
This marine species is highly pelagic, occuring in warm waters and rarely approaching land except near colonies. It feeds mostly on planktonic crustaceans, fish and squid but will also feed on human refuse. It mainly feeds in the day on the wing by pattering, dipping and also by surface-seizing. Its breeding season varies locally in colonies on undisturbed islets, in flat areas near the sea or inland on cliffs (del Hoyo et al. 1992)

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References
del Hoyo, J.; Elliot, A.; Sargatal, J. 1992. Handbook of the Birds of the World, vol. 1: Ostrich to Ducks. Lynx Edicions, Barcelona, Spain.

Text account compilers
Ekstrom, J., Butchart, S., Calvert, R.

Recommended citation
BirdLife International (2014) Species factsheet: Oceanodroma castro. Downloaded from http://www.birdlife.org on 11/07/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 11/07/2014.

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.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Additional resources for this species

ARKive species - Madeira storm-petrel (Oceanodroma castro) 0

Key facts
Current IUCN Red List category Least Concern
Family Hydrobatidae (Storm-petrels)
Species name author (Harcourt, 1851)
Population size 150000 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 84,900,000 km2
Country endemic? No
Links to further information
- Additional Information on this species