Threatened species of water fowl
Visualization of narrower problems
Name(s):
Endangered species of waterfowl
Endangered waterbirds
Incidence
Water fowl have suffered greatly from habitat encroachment throughout the world; populations in the USA may be as little as one tenth of what they were before the coming of European civilization. For instance, the Redhead, a once popular and fairly common duck species, decreased in numbers from about 100,000 to fewer than 3,000 in the period from 1955 to 1974, a reduction in the population of 97.6%.
Examples of critically endangered species of Anseriformes (ducks, swans and geese) classified in 1993 by the IUCN as having a 50% probability of extinction within 5 years or 2 generations, whichever is longer, are: the Brazilian merganser [Mergus octosetaceus] with a known population of ca.20; Madagascar pochard [Aythya innotata] (one bird seen in the last 20 years); Madagascar teal [Anas bernieri] (only one breeding site known with 10 pairs in 1992); Campbell Island flightless teal [Anas aucklandica nesiotis] (population of 30-100); and the crested shelduck [Tadorna cristata] (last recorded in 1971).
Broader
Narrower
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(E) Emanations of other problems