INTRODUCTION: Since 1983 inexplicably large numbers of dead...
INTRODUCTION: Since 1983 inexplicably large numbers of dead and dying common l oons (Gavia immer) have been found along Floridas Gulf Coast. Under threat fr om acid rain, lake pollution, and human encroachment, their numbers are declini ng elsewhere as well. Lake acidification has resulted in fewer fish, the birds principal f ood. More insidiously, it increases the rate at which mercury in ponds is toxi fied, the poisonous methylmercury enters the food chain and is eventually inges ted by the loon. It attacks the birds nervous system, hindering its ability to feed and reproduce. ----- LEGEND: A swimming male loon in breeding plumage emits a trem olo (call). Known for their haunting nocturnal cries, which include yodels as well as tremo los, loons will often engage in antiphonal calling, creating an unforgettable c horus.
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Tags: LOONS, COLORS, BREEDING, include, VIEWS, numbers, ponds, cries, toxi, CLOSE, RARE, ted, antiphonal, olo, WYOMING
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