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发表于 2025-3-25 05:06:06
Environment of Arctic Life,omplex ice-filled sea routes north of America. These routes circumnavigate the Arctic Ocean, which forms a polar basin with bordering Eurasian and American coasts and with large islands projected northward from each continent.
Figate
发表于 2025-3-25 08:54:22
Arctic Land Birds and Their Migrations,uently nocturnal mammals, which are so strongly guided by the sense of smell that finds so little use by birds and men. Rather scant familiarity with birds in the Arctic, however, has led to some confusing generalizations upon the manner of their arctic life.
Inflamed
发表于 2025-3-25 15:13:26
Maintenance of Arctic Populations of Mammals,ulations that are now extinct. Erosion of the rocky breeding places demonstrates the persistence of their seasonal use. Northern elephant seals . and a northern outpost of southern fur seals . have reconstituted populations from at most only a few survivors of slaughter to occupy again rocks or beac
dyspareunia
发表于 2025-3-25 17:46:12
Book 1972es. At the time of my arrival in Alaska many of the arctic Eskimos were still largely dependent on natural resources of their immediate and local environment, in which great seasonal changes in temperature and solar radiation appeared as dominant factors. The living environment on which they subsist
慎重
发表于 2025-3-25 22:49:08
Introduction,ch developed the Arctic Research Laboratory. While we examined the rather surprisingly modest metabolic rates of arctic warmblooded animals in cold, Per Scho-lander proposed and then carried out measurements of metabolism of some tropical animals in Panama. The differences could be formulated to sho
affect
发表于 2025-3-26 03:35:32
Environment of Arctic Life,ave gained an impression of the vast extent of their frozen surface. As a matter of fact the two frigid zones within the Arctic and Antarctic Circles comprise the smallest areas of the earth’s climatic zones. Vague recognition of their small extent impelled explorers in the 16th through 19th centuri
ARENA
发表于 2025-3-26 04:50:07
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显而易见
发表于 2025-3-26 11:57:49
Arctic Land Birds and Their Migrations, A biologist knowledgeable about the American Arctic (., 1968) estimated 70 arctic-breeding species of birds out of a world list of 8600. Of 3200 listed mammals, he estimated that 23 lived on land north of forests, with five or six more occurring in arctic seas. Because birds are visible and audible
刻苦读书
发表于 2025-3-26 14:48:39
Maintenance of Arctic Populations: Birds,vation is difficult for a stranger. But even though few are seen, all of the resident populations of birds and mammals are present (Chapters 3 and 4). Hares and foxes remain above the snow; rodents forage in subnivean activity; poikilothermous animals in the soil and plants are quiescent; but to cal
Gullible
发表于 2025-3-26 20:38:22
Maintenance of Arctic Populations of Mammals,ce or shores and for periods explicit for each population they become attached to specific breeding localities until the pups acquire sufficient capability for independent aquatic life. In these temporarily fixed situations the populations are visible. Exposure at time of breeding, particularly by p