| ןורג-רוחש ןללוצ (3 | ||||||||||
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.ונממ רידנו Gavia immer
ינופצה ןללוצהמ ןטק :ןורג-רוחש ןללוצ .םייכנא םינבלו םירוחש םיספב םיוולמ רוחשו רופא יעבצ וראוצבו ,רופא ושאר , רוזיחה תפוקתב .בגהמ רתוי ףרועהו דוקדוקה םיריהב ףרוחב ,ןידע ורוקמו תוחפ לולת וחצמ .תוגייט ירוזאב םיקומע םימ ימגא ולודיג תיב .רתויב רידנ יארקאב ןמדזמ ץראב | ||||||||||
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Subspecies and Distribution.
G.a. pacifica extreme N & NW Nearctic; winters Pacific coast ofN America. G.a.arctica W Palearctic E to R L ena; winteres along coasts ofNW Europe, also in black, Caspian and Mediterranean Seas. G.a. viridigularis E Palearctic E of R Lena; winters NW Pacipic. | ||||||||||
Descriptive notes.58-73 cm; 1300-3400 g; wingspan 110-130 cm. Thicker neck and straighterlooking bill than G. stellata .Non-breeding adult brownish grey above, white below with noticeable white patch on flanks. Juvenile as non-breeding adult, withindistinct buffy scaling on upperparts.Race pacifica smaller with head and hind neck paler and bill tinner, viridigularis differs from nominate in green throat patch. HabitatBreeds on fairly large, deep fresh water lakes, preferably with islets;more typically in taiga and boreal zone, less in arctic tundra than G. stellata. Winters on inshore waters along sheltered coasts, occasionaly inland.Food and FeedingMostly fish, including gobies, herring, sprat, sculpins, cod, perch, trout, bleak occasionally crustaceans, molluscs, frogs, insects and sometimes some plant matter. Dives recorded to 3-6 m, averaging 45 seconds.Breeding.Starts May in S of range, dependent on spring thaw in N, Solitary; nestis heap ofplant matter near water's edge. 1-3 eggs, almost always2,incubation 28-30 days. chicks have sooty brown down, paler below; fledging60-65 days.Sexual maturity at 2-3 years lived over 27 years in thewild. Movements.Migratory and dispersive; generally moves southwards and towards sea after breeding.shunning ice-covered water; often forms flocks of 50 birds. Accidental S to Tropic of Cancer.Status and ConservationNot globally threatened. World population probably large, in the order of several million birds,but generally decreasing throughout S of range. Over 1 million recordedon spring migration off california in 1980.Israel.In Israel subspecies G.a. pacifica. Accidental visitor. found at shores of Dead Sea and Eilat. |
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