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.הרידמ ןורועסי (26 | ||||||||||
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.םוח יללכה ועבצ :הרידאמ ןורועסי .ןטק ןורועסילו יטנלטא ןורועסיל ,ןוסליו ןורועסיל המוד ופועמ תעשב .תצקמב תוכורא ויפנכו ןטקה ןורועסיהמ תצקמב לודג .רתוי ןבלה ותשב יטנלטאה ןורועסיהמו ,רתוי תורצקהו תורוחשה וילגרב לדבנ ןוסליו ןורועסימ .קחרממ ךכב ןיחבהל השק לבא ץרופמ ובנז .םיממושו םיקחורמ םייאב ןנקמ .םימח םיסוניקואו םימי ולודיג תיב .רתויב רידנ יארקאב ןמדזמ ץראב | ||||||||||
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Subspecies and Distribution.
Oceanodroma castro E Atlantic from Portugal Is. and Azores to Ascension Is.and St Helena In the Pacific off E Japan, Hawaii and at Galapagos. | ||||||||||
Descriptive notes.19-21 cm; 29-56 g, wingspan 44-46 cm. Wings shape intermediate between Oceanites oceanicus and Oceanodroma leucorhoa: tail slightly forked, unlike Oceanites: and Hydrobates,: and underwing uniformly dark.Legs do not project beyond tip of tail in flight. Juvenile has mor grey on greater upperwing-coverts. Habitat.Marine and highly pelagic,occurring in warm waters; rarely approaches land except near colonies.Breeds on undisturbed islets, in flat areas near sea or inland on cliffs. HabitatSeason varies locally; in Galapagos two distinct populations breed annually, but 6 months out of phase.Colonial; nests in rock crevices or burrows. 1 egg; incubation 42 days, with stints of 4-7 days; chicks pale grey down, brooded for 7 days; fledging 64-73days. Estimated annual mortality of adults 6%; known to have reached nearly 11 years old in wild. Food and Feeding> Mostly planktonic crustaceans, small fish and squid; also feeds on some human refuse.Feeds mainly on wing, by pattering and dipping; also surface-seizes. Most feeding by day. Movements.Apparently some birds largely sedentary, since colonies visited irregularly throughout year; others disperse widely, with records from Atlantic coast N America, Britain, Cuba and Brazil.Status and ConservationNot globally threatend. Widespread, many islands holding several thousand breeding pairs; figures lacking for several areas. Main threats include exploitation by local fishermen, particularly on some Atlantic islands, and predation by introduced mammals, rats, mice, mongooses; land crabs and Barn Owls kill many birds in Cape Verde Is.Israel.In Israel subspecies Oceanodroma castro. Very rare visitor. |
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