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Whooper Recount: A Close Look At These Endangered Cranes Reveals That, While Their Numbers Are Increasing, Their Rate Of Increase Is Actually Declining, Paul A. Johnsgard
Whooper Recount: A Close Look At These Endangered Cranes Reveals That, While Their Numbers Are Increasing, Their Rate Of Increase Is Actually Declining, Paul A. Johnsgard
Papers in Ornithology
I have assembled figures for the 43-year period from 1938 through 1980, and have subjected them to various kinds of analysis. During this period, 220 young and 1,437 postjuvenile birds have appeared on the wintering grounds. This works out to an annual recruitment rate of 13.3 percent. (This is not exactly the same as the birthrate, of course, since the loss of eggs, chicks, and juveniles prior to arrival at Aransas is excluded.) The recruitment rate provides an estimate of the rate of maximum annual population increase. One hundred fifty-four birds that had been counted in any given year failed …
Teton Wildlife: Observations By A Naturalist, Paul A. Johnsgard
Teton Wildlife: Observations By A Naturalist, Paul A. Johnsgard
Papers in Ornithology
The diversity of wildlife in Grand Teton National Park and its environs draws millions to the valley of Jackson Hole every year, but few are the visitors who are able to observe individual species over the course of several seasons. Paul Johnsgard, a noted naturalist who has written many books on the waterfowl of the world, here integrates his own observations with those who have studied Teton wildlife in the past. The result is a compassionate, simple reconstruction of the lives of a few individuals from spring through early autumn.
Teton Wildlife describes the migration of a herd of antelope …