. Coast Watch. Risorse Marine; oceanografia; gestione delle zone costiere; ecologia costiera. la costa in autunno. Il vento non concentrare gli uccelli in primavera." alcuni uccelli migratori rivendicazione Carolina del Nord come il loro inverno home. "Se sei dal Canada del nord, nord Carolina sembra un ottimo posto per l'inverno," dice Parnell. Ogni anno, il lago Mattamuskeet è visitato da 25.000 a 30.000 snowy white-ospiti. Da Novembre a Febbraio il lago è a casa per la tundra swan, dalla tundra in Alaska e nord- ovest territori, nonché un piccolo gregge di oche canadesi, le oche delle nevi e tho

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. Coast watch. Marine resources; Oceanography; Coastal zone management; Coastal ecology. the coast in the fall. The winds don't concentrate birds in the spring." Some migrating birds claim North Carolina as their winter home. "If you're from northern Canada, North Carolina seems like a great place to winter, " says Parnell. Every year, Lake Mattamuskeet is visited by 25, 000 to 30, 000 snowy-white guests. From November to February, the lake is home to the tundra swan, from the Alaskan tundra and North- west territories, as well as a small flock of Canadian geese, snow geese and thousands of ducks — both divers and puddle ducks. "The theory is that the swans used to winter in the Chesapeake Bay area, " says Don Temple, refuge manager at Lake Mattamuskeet. "But the decline of submerged aquatic vegetation, the swan's primary food source, brought them here." At Lake Mattamuskeet, the swans also feed on the surplus crops of winter wheat found in the area. For Walker Golder, an ornitholo- gist and photographer at Wrightsville Beach, there's more to birdwatching than what's in plain sight. "If you go out to the end of a pier and get away from the noise of the street, " he says, "you'd be amazed at what you can hear — songbirds, ducks, shorebirds. A lot of people bird by ear more often than they bird by sight." Although scientists can tell you 4 SEPTEMBER/OCTOBER 1995 which species is which and when each is likely to come, they can't tell you why. Food avail- ability is one of the factors many suspect cause migrations. "If you're an insect eater, then all the food is gone in cold condi- tions, " says Parnell. "If you're a seed eater, then all the seeds might be covered in ice." Other birds may move to escape cold, harsh winter weather. "Some may migrate because it's traditional to move south, " says Parnell. "But in many cases, it's survival." Whatever the reason, says Golder, "

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• bookcentury1900
• bookcollectionunclibra
• booksubjectoceanography