Pacific Loon
Pacific Loon ( Gavia pacifica )
The Pacific Loon ( Gavia pacifica ), also called white-naped divers, is a medium- sized species of the family of loons. It occurs in Northeast Asia and the Arctic and sub-Arctic parts of North America.
The Pacific diver is very similar to that in Central Europe occasionally occurring during the winter half- year -throated diver and together with this type, a super species. The distribution of these two species overlap partially. The sympatry of both species in a significant portion of their range without hybridization, although both types partly brood together on the same waters, is one of the evidence that it is in fact two separate species with them. Compared to the black-throated diver, the Pacific diver a shorter and thinner beak and a massive head on a short, relatively thick neck.
Features
The 61 cm long Pacific Divers is a small grebe with a straight slender beak. Males weigh 1500-2600 grams, females from 1200 to 2500 grams. In breeding plumage the head is colored light gray; Neck and back are black with white stripes and the black throat shimmers purple. In finishing the entire dress top is solid black gray. Top of the head, hind neck and sides of neck are gray; the lower sides of head, chin, throat and fore neck are sold sharp white. The gray sides of the neck are often limits dark forward. The beak is pale gray, the beak is dark gray ridge.
The juvenile plumage is very similar to the sizing dress, which coverts the top, however, are gray-brown and finely lined with more light, so that the top appears a total of corrugated clear. The iris is brown. The first Dunenkleid is dark brown, the underparts of the chicks is a little brighter. The belly is gray and around the eye runs an indistinct whitish ring. The second Dunenkleid is similar, but somewhat brighter. The belly is whitish.
He flies with ausgestreckem neck. His utterance is a high yodel exemplary howling.
Dissemination
The Pacific Diver breeds on deep lakes in the tundra of Alaska to Baffin Iceland and south to British Columbia, Manitoba and Ontario. In Northeast Asia, the breeding ground extends in a strip about the Festlandstundren of the lowlands of Jana eastward over the delta of Indigirka and Kolyma, reaches in places such as the lower reaches of the Indigirka the southern boundary of the tundra zone extends further over the Tschaunniederungen that bordering the sea tundra of the northern part of the Chukchi Peninsula and the catchment area of square bowls and Tanjurer, the Anadyrgebiet up to the lowlands of the Chaturka and to the north of the Korjakengebirges. He also happens to be on the Great Ljachowinsel and is a Irrgust on Wrangel Island, where he broods but not.
Unlike other loons, he emigrated in swarms. He wintered on the Pacific coast or on large lakes.
Way of life
The Pacific diver feeds on fish, which it catches under water. He is sometimes associated with flocks of other seabirds such as Silberalk, kittiwake and Nashornalk. The two olive - brown geflecken eggs are laid in a mostly lined with aquatic plants soil near the water trough.