Band-rumped storm petrel
|Band-rumped storm petrel|
The band-rumped storm petrel is 19–21 cm in length with a 43–46 cm wingspan, and weighs 44–49 g. It is mainly brownish black with an extensive white rump. Similar to Leach's storm petrel with the forked tail, long wings, but Leach's has a more deeply forked tail, a differently shaped (V-shaped or triangular) white rump, and a 'tern-like' flight, whereas the band-rumped storm-petrel has a more 'shearwater-like' flight.
The species breeds on islands in the warmer parts of the Atlantic and Pacific Oceans. These include the Berlengas (a few tens of kilometres off mainland Portugal), the Azores, Madeira, Canary Islands and Saint Helena in the Atlantic, and in the Pacific off eastern Japan, on Kauai, Hawaii, and on the Galápagos Islands. In 2018, the species was reported to have also started breeding on the Mauna Loa volcano on the island of Hawaii.
Birds nest in colonies close to the sea in rock crevices and females lay a single white egg per breeding attempt. The band-rumped storm petrel spends the non-breeding period at sea. It is strictly nocturnal at its breeding sites to avoid predation by gulls and diurnal raptors such as peregrines, and will even avoid coming to land on clear moonlit nights. Like most petrels, its walking ability is limited to a short shuffle from/to the burrow.
Individuals feed by picking up prey items (invertebrates, small vertebrates and sometimes carrion) from the water surface. A study aiming to determine the diving abilities of this species  was actually conducted on the 'warm season' population from the Azores, which was later recognized as a distinct species (see below).
Recent discoveries of 'cold season' and 'warm season' populations, which use the same nest sites at different times of year, and also differ in terms of vocalisations and moulting period, may hint at the existence of two 'cryptic species' within the currently understood limits of the species. After population genetics analyses of mtDNA, the warm season population in the Azores was recognized as a separate species, Monteiro's storm petrel.
- BirdLife International (2013). "Oceanodroma castro". IUCN Red List of Threatened Species. 2013. Retrieved 26 November 2013.old-form url
- "Band-rumped Storm-petrel". IUCN. Retrieved 5 November 2020.
- "Band-rumped Storm-petrel Nests Found on Mauna Loa - Island Conservation". Island Conservation. 2018-01-04. Retrieved 2018-01-12.
- Bried, Joël (2005): Diving Ability of the Madeiran Storm Petrel. Waterbirds 28(2): 162–166. DOI:10.1675/1524-4695(2005)028[0162:DAOTMS]2.0.CO;2 HTML abstract
- M. Bolton, A.L. Smith, E. Gomez-Diaz, V.L. Friesen, R. Medeiros, J. Bried, J.L. Roscales & R.W. Furness (2008) "Monteiro's Storm Petrel Oceanodroma monteiroi: a new species from the Azores" Ibis 150 (4): 717–727 doi:10.1111/j.1474-919X.2008.00854.x
- Snow, D.W. & Snow, B.K. (1966). "The breeding season of the Band-rumped Storm Petrel (Oceanodromo castro) in the Galapagos." Ibis 108(2):283-284.