bookbugs.net

PDF download and read online

Waterfowl Populations And Breeding Conditions Summer 1954

Waterfowl Populations and Breeding Conditions  Summer 1954 PDF
Author: U.S. Fish and Wildlife Service
Publisher:
Release: 1955
ISBN:
Size: 16.10 MB
Format: PDF, ePub, Docs
Category : Waterfowl
Languages : en
Pages : 288
View: 6178

Download

Waterfowl Populations And Breeding Conditions Summer 1954

by U.S. Fish and Wildlife Service, Waterfowl Populations And Breeding Conditions Summer 1954 Books available in PDF, EPUB, Mobi Format. Download Waterfowl Populations And Breeding Conditions Summer 1954 books,



A Study Of Canvasback And Redhead Breeding Populations Nesting Habitats And Productivity

A Study of Canvasback and Redhead Breeding Populations  Nesting Habitats and Productivity PDF
Author: David P. Olson
Publisher:
Release: 1964
ISBN:
Size: 54.16 MB
Format: PDF, ePub, Docs
Category : Birds
Languages : en
Pages : 200
View: 5817

Download

A Study Of Canvasback And Redhead Breeding Populations Nesting Habitats And Productivity

by David P. Olson, A Study Of Canvasback And Redhead Breeding Populations Nesting Habitats And Productivity Books available in PDF, EPUB, Mobi Format. Download A Study Of Canvasback And Redhead Breeding Populations Nesting Habitats And Productivity books, This study is an attempt to compare canvasback (Aythya valisineria) and redhead (Aythya americana) breeding populations and productivity on small prairie potholes, a large marsh, and a large shallow lake. The objectives are: 1) to record the changes in the sex and age composition and the size of canvasback and redhead breeding populations during the reproductive season; 2) to compare large and small habitats in relation to nesting and brood success; and 3) to investigate the interrelationships between canvasbacks and redheads attempting to nest on the same areas. The canvasback and redhead are diving ducks of the tribe Aythyini and both species are native only to the North American continent. They are quite similar in size, appearance and feeding behavior, but there is even more similarity in the habitats they use, particularly nesting habitat. Both species construct over-water nests in dense, emergent, aquatic plant cover. The canvasback tends to nest somewhat earlier than the redhead.



Report Series

Report Series PDF
Author:
Publisher:
Release: 1974
ISBN:
Size: 27.73 MB
Format: PDF, Kindle
Category : Wildlife conservation
Languages : en
Pages :
View: 2715

Download

Report Series

by , Report Series Books available in PDF, EPUB, Mobi Format. Download Report Series books,



Technical Bulletin

Technical Bulletin PDF
Author:
Publisher:
Release: 1964
ISBN:
Size: 41.94 MB
Format: PDF, Kindle
Category : Fisheries
Languages : en
Pages :
View: 440

Download

Technical Bulletin

by , Technical Bulletin Books available in PDF, EPUB, Mobi Format. Download Technical Bulletin books,



A Study Of Waterfowl Ecology On Small Impoundments In Southeastern Alberta

A Study of Waterfowl Ecology on Small Impoundments in Southeastern Alberta PDF
Author: Lloyd B. Keith
Publisher:
Release: 1959
ISBN:
Size: 36.60 MB
Format: PDF, Docs
Category : Animal ecology
Languages : en
Pages : 504
View: 3032

Download

A Study Of Waterfowl Ecology On Small Impoundments In Southeastern Alberta

by Lloyd B. Keith, A Study Of Waterfowl Ecology On Small Impoundments In Southeastern Alberta Books available in PDF, EPUB, Mobi Format. Download A Study Of Waterfowl Ecology On Small Impoundments In Southeastern Alberta books, The object of this paper is to present information on waterfowl ecology and populations, derived from studies conducted over five breeding seasons on a group of small impoundments in southeastern Alberta. The parklands and mixed-prairie grasslands of the three Prairie Provinces extend almost 800 mi. east and west, and up to 400 mi. north and south. This region is the acknowledged duck factory of North America. The parklands, an ecotone between grassland and boreal forests, comprise about 85,000 sq. mi. The many natural lakes and potholes here are seldom dry. On the other hand, grassland areas totalling approximately 100,000 sq. mi. contain numerous drought-susceptible water areas. These shallow ponds may vanish midway through the breeding season in years of low rainfall and/or poor runoff, and during such times tens of thousands of young waterfowl undoubted perish. Two organizations are actively engaged in construction of permanent impoundments on the mixed prairie. The Dominion Gover.