Book Description
Emphasis is on the needs of the 48 species of ducks, geese and swans, and the conservation of the lands and waters which sustain them.
Author : United States. Bureau of Sport Fisheries and Wildlife
Publisher :
Page : 794 pages
File Size : 49,92 MB
Release : 1964
Category : Birds
ISBN :
Emphasis is on the needs of the 48 species of ducks, geese and swans, and the conservation of the lands and waters which sustain them.
Author :
Publisher :
Page : 738 pages
File Size : 39,23 MB
Release : 1965
Category : Fishing
ISBN :
Author :
Publisher :
Page : 270 pages
File Size : 29,40 MB
Release : 1962
Category : Animals
ISBN :
Author : United States. Bureau of Sport Fisheries and Wildlife
Publisher :
Page : 40 pages
File Size : 29,85 MB
Release : 1968
Category : Waterfowl management
ISBN :
Author :
Publisher :
Page : 260 pages
File Size : 23,5 MB
Release : 1965
Category : Animals
ISBN :
Author : Paul Johnsgard
Publisher : Lulu.com
Page : 229 pages
File Size : 29,97 MB
Release : 2017-03
Category : Nature
ISBN : 1609621093
This volume, the fourth in a series of books that collectively update and expand P.A. Johnsgard's 1975 The Waterfowl of North America, summarizes research findings on this economically and ecologically important group of waterfowl. The volume includes the mostly tropical perching duck tribe Cairinini, of which two species, the muscovy duck and the wood duck, are representatives. Both species are adapted for foraging on the water surface, mostly on plant materials, but typically perch in trees and nest in elevated tree cavities or other elevated recesses. This volume also includes the dabbling, or surface-feeding, duck tribe Anatini, a large assemblage of duck species that mainly forage on the water surface but nest on the ground, or only very rarely in elevated locations. Of this tribe, 12 species that regularly breed in North America are included, among them such familiar species as mallards, wigeons, pintails, and teal. Descriptive accounts of the distributions, populations, ecologies, social-sexual behaviors, and breeding biology of all these species are provided, together with distribution maps. Five additional Eurasian and West Indian species have been reported several times in North America; these have been included with more abbreviated accounts, but all 17 species are illustrated by drawings, photographs, or both. The text includes about 84,000 words and contains more than 1,000 references. There are also 12 distribution maps, 21 drawings, 28 photographic plates, and 58 anatomical or behavioral sketches.
Author : United States. Bureau of Sport Fisheries and Wildlife
Publisher :
Page : 96 pages
File Size : 43,35 MB
Release : 1965
Category : Fisheries
ISBN :
"In the calendar year 1964, the main efforts of the Division of Wildlife Research were directed toward consolidation of recently expanded programs on pesticide-wildlife relations and nuisance-animal control. A modest increase in activities associated with the captive propagation of rare and endangered birds was accommodated, and a great deal of planning laid groundwork for future work with threatened species. There was no change in purpose and function of the Division"--Page 1
Author : Paul Johnsgard
Publisher : Lulu.com
Page : 186 pages
File Size : 49,84 MB
Release : 2017-03-24
Category : Nature
ISBN : 1609621107
Although the 12 species representing three waterfowl tribes described in this volume are not closely related, they fortuitously provide an instructive example of adaptive evolutionary radiation within the much larger waterfowl lineage (the family Anatidae), especially as to their divergent morphologies, life histories, and social behaviors. The whistling-ducks (Dendrocygna), with three known North American species, are notable for their permanent pair-bonds, extended biparental family care, and strong social cohesion. In contrast, males of the five typical pochards of North American diving ducks (Aythya) establish monogamous pair-bonds that are maintained only long enough to assure that the female's eggs are fertilized. The endpoint of this behavioral gradient, promiscuity or polygyny, exists among at least some of the typical stifftails (Oxyura). Such diverse reproductive strategies have exerted powerful evolutionary influences on interspecies variations in sexual dimorphism, sexual behavior, anatomy, ecology, and other traits. This volume includes more than 63,000 words, plus some 200 maps, photos, drawings, and sketches, and nearly 650 literature citations. It is the last of five volumes that describe all 55 waterfowl species that have been historically documented in North America; collectively, the volumes total over 300,000 words, with nearly 3,000 literature citations, and more than 600 maps, photos, drawings, and sketches.
Author :
Publisher :
Page : 136 pages
File Size : 48,5 MB
Release : 19??
Category : Fisheries
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Author :
Publisher :
Page : 266 pages
File Size : 25,55 MB
Release :
Category : Fishery law and legislation
ISBN :