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Articles 107581 - 107610 of 114036
Full-Text Articles in Entire DC Network
Handbook Of Waterfowl Behavior: Tribe Dendrocygnini (Whistling Ducks), Paul A. Johnsgard
Handbook Of Waterfowl Behavior: Tribe Dendrocygnini (Whistling Ducks), Paul A. Johnsgard
Handbook of Waterfowl Behavior by Paul A. Johnsgard
The whistling, or "tree," ducks comprise a group of eight species of world-wide, though primarily tropical, distribution. A single genus, Dendrocygna, is generally accepted, and indeed the species form such a homogeneous group that it is extremely difficult to establish intrageneric differences upon which to judge probable species relationships. In most respects, whistling ducks are very gooselike, differing from geese mainly in their more specialized tracheal structure, their whistling voices, and their distinctive downy plumage patterns. They possess relatively long legs and large feet, and they can dive remarkably well.
Handbook Of Waterfowl Behavior: Tribe Anserini (Swans And True Geese), Paul A. Johnsgard
Handbook Of Waterfowl Behavior: Tribe Anserini (Swans And True Geese), Paul A. Johnsgard
Handbook of Waterfowl Behavior by Paul A. Johnsgard
The swans and true geese of the present tribe include about 21 species which are primarily temperate and arctic in distribution, with most forms occurring in the Northern Hemisphere. They are generally large grazing or dabbling birds, and all are highly social and have strong family bonds. Plumage patterns are the same in both sexes and tend to be relatively simple, with visual signal characteristics generally restricted to the bill, head, and rump. For the most part the species are very vocal, and in the true geese vocalizations probably reach the highest degree of development in the entire family.
Handbook Of Waterfowl Behavior: Tribe Stictonettini (Freckled Duck), Paul A. Johnsgard
Handbook Of Waterfowl Behavior: Tribe Stictonettini (Freckled Duck), Paul A. Johnsgard
Handbook of Waterfowl Behavior by Paul A. Johnsgard
I include the Australian freckled duck, as the only member of a proposed tribe Stictonettini, as I originally suggested in 1960 on a tentative basis. Previously the freckled duck had been generally considered an aberrant dabbling duck with several primitive features, such as a reticulated tarsus, simple tracheal structure (illustrated in Johnsgard, 1961c), and absence of metallic plumage coloration or distinct plumage dimorphism. No hybrids have been recorded involving this species, which occurs widely but infrequently over the southern half of Australia.
Handbook Of Waterfowl Behavior: Tribe Tadornini (Sheldgeese And Shelducks), Paul A. Johnsgard
Handbook Of Waterfowl Behavior: Tribe Tadornini (Sheldgeese And Shelducks), Paul A. Johnsgard
Handbook of Waterfowl Behavior by Paul A. Johnsgard
The tribe includes the 16 species of sheldgeese and shelducks ("Lophonetta" and Tachyeres are here excluded from the tribe) which provide such a smooth transition from the true geese to the true ducks that it is difficult to establish a dividing line between the two groups. I believe that the line is best placed between Cereopsis on the anserine side and Cyanochen on the anatine side. Cyanochen is clearly a sheldgoose, but the plumages and voices of the sexes are practically alike, as are also their displays. Cyanochen and the other Tadornini are characterized by a downy plumage that is …
Handbook Of Waterfowl Behavior: Tribe Tachyerini (Steamer Ducks), Paul A. Johnsgard
Handbook Of Waterfowl Behavior: Tribe Tachyerini (Steamer Ducks), Paul A. Johnsgard
Handbook of Waterfowl Behavior by Paul A. Johnsgard
I consider the three species of steamer ducks of the genus Tachyeres to constitute a separate tribe. These authorities agree that although steamer ducks are perhaps most closely related to the true shelducks, the steamers are sufficiently different to warrant removing them from the shelduck tribe. Their downy young lack the strongly contrasting coloration typical of shelducks, and the adult plumage pattern is distinct both from that of the shelducks and from that of the other anatine groups. There is a slight sexual dimorphism in bill color, head color, and possibly in the degree of tail-feather curling. Pair bonds appear …
Handbook Of Waterfowl Behavior: Tribe Cairinini (Perching Ducks), Paul A. Johnsgard
Handbook Of Waterfowl Behavior: Tribe Cairinini (Perching Ducks), Paul A. Johnsgard
Handbook of Waterfowl Behavior by Paul A. Johnsgard
Delacour and Mayr (1945) placed the perching duck tribe after the pochards (Aythyini) and adjacent to the sea ducks (Mergini), but hybridization evidence (Johnsgard, 1960a) clearly indicates that the group belongs between the shelducks and the dabbling ducks and closely adjacent to the latter. There is other evidence to support this arrangement. The tracheae of shelducks, perching ducks, and dabbling ducks are all very similar, possessing bullae which in most species are osseous and rounded, and lacking enlargements of the tracheal tube. The downy young of perching ducks and dabbling ducks are very similar, and are usually patterned with dark …
Handbook Of Waterfowl Behavior: Tribe Anatini (Surface-Feeding Ducks), Paul A. Johnsgard
Handbook Of Waterfowl Behavior: Tribe Anatini (Surface-Feeding Ducks), Paul A. Johnsgard
Handbook of Waterfowl Behavior by Paul A. Johnsgard
The tribe of surface-feeding, or dabbling, ducks is the largest single tribe in the family. There are 40 species in the tribe as it is constituted here. Contrary to the arrangement of Delacour (1956), the ringed teal is included in the Cairinini; and the crested duck, included in the Tadornini by Delacour, is here considered a typical dabbling duck. In addition, the pink-headed duck has been removed from the Anatini and placed in the Aythyini with the pochards, and the freckled duck has been removed from the tribe and is considered a primitive species having anserine relationships. The marbled teal …
Handbook Of Waterfowl Behavior: Tribe Aythyini (Pochards), Paul A. Johnsgard
Handbook Of Waterfowl Behavior: Tribe Aythyini (Pochards), Paul A. Johnsgard
Handbook of Waterfowl Behavior by Paul A. Johnsgard
The dabbling ducks grade almost imperceptibly into the pochard group considered here, and whether Marmaronetta and Rhodonessa should be included in one tribe or the other may be open to some question. As here constituted, the tribe includes 16 species of almost world-wide distribution which differ from the preceding group in several minor details. The hind toe has a larger lobe than occurs in the dabbling ducks, and it presumably aids in diving. The feet are also correspondingly larger and are set farther apart and more to the rear than in Anas. One of the most clear-cut differences is …
Handbook Of Waterfowl Behavior: Tribe Mergini (Sea Ducks), Paul A. Johnsgard
Handbook Of Waterfowl Behavior: Tribe Mergini (Sea Ducks), Paul A. Johnsgard
Handbook of Waterfowl Behavior by Paul A. Johnsgard
The tribe includes 20 species of which two are extinct. Except for two Southern Hemisphere species, the group is of northern and arctic distribution. All species consume a high proportion of animal material, although they are by no means all "sea" ducks. All dive extremely well, although the manner of diving varies in that some species usually open their wings when diving and others never do. All the species except the isolated Southern Hemisphere forms exhibit considerable sexual dimorphism in plumage, voice, and behavior, and there is much sympatry of ranges. Some genera (Somateria, Polysticta, Clangula, …
Handbook Of Waterfowl Behavior: Tribe Oxyurini (Stiff-Tailed Ducks), Paul A. Johnsgard
Handbook Of Waterfowl Behavior: Tribe Oxyurini (Stiff-Tailed Ducks), Paul A. Johnsgard
Handbook of Waterfowl Behavior by Paul A. Johnsgard
The stiff-tailed ducks constitute a unique section of the Anatidae that is possibly the most isolated of all the tribes with the exception of the Anseranatini. There are eight species which almost certainly belong in the group, plus one more that is only very tentatively included. The tribe is of worldwide occurrence. Seven of the species have long, narrow, and stiffened tail feathers that function as rudders in underwater swimming, at which all species are very adept. These species also have a dense and shiny body plumage much like that of grebes, but lack metallic coloration altogether. The typical species …
Handbook Of Waterfowl Behavior: Summary And Synopsis Of The Family Anatidae, Paul A. Johnsgard
Handbook Of Waterfowl Behavior: Summary And Synopsis Of The Family Anatidae, Paul A. Johnsgard
Handbook of Waterfowl Behavior by Paul A. Johnsgard
The major sexual behavior patterns of the species of Anatidae may now be reviewed and summarized, for the purpose of clarifying evolutionary relationships in the family, tracing the evolution of behavior patterns through various taxa, and evaluating the importance of certain behavior patterns as potential isolating mechanisms.
Handbook Of Waterfowl Behavior: Works Cited, Paul A. Johnsgard
Handbook Of Waterfowl Behavior: Works Cited, Paul A. Johnsgard
Handbook of Waterfowl Behavior by Paul A. Johnsgard
Approximately 150 works cited. (7 pages)
Handbook Of Waterfowl Behavior: Indexes, Paul A. Johnsgard
Handbook Of Waterfowl Behavior: Indexes, Paul A. Johnsgard
Handbook of Waterfowl Behavior by Paul A. Johnsgard
General index: The principal page reference for each species or group is indicated by boldface type. Subordinate page references for each species are listed only under the standardized English names used in this book, as shown in the Appendix. Commonly used alternate names, or names referring to certain races or species groups, are included in the index but only principal page references are listed under these names. Page references to illustrations of species or of specific displays are indicated by italics. The Appendix and Summary have not been indexed.
Scientific Names: This index provides a reference only to the page …
Utah Upland Game Bird Harvest 1964 Publication, Bob Nielson, Jess Winn, Reed Henderson, Robert Hinman, James Bates
Utah Upland Game Bird Harvest 1964 Publication, Bob Nielson, Jess Winn, Reed Henderson, Robert Hinman, James Bates
Other Publications in Wildlife Management
To determine the harvest of upland game birds, hunting success, distribution of harvest, and distribution of hunting pressure in 1964.
Ec65-130 Chemicals That Control Weeds - A Guide For 1965
Ec65-130 Chemicals That Control Weeds - A Guide For 1965
University of Nebraska-Lincoln Extension: Historical Materials
Extension Circular 65-130 discusses chemicals that control weeds.
Ec65-85 How The Cooperative Extension Service Serves Nebraska
Ec65-85 How The Cooperative Extension Service Serves Nebraska
University of Nebraska-Lincoln Extension: Historical Materials
Extension Circular 65-85 discusses how the cooperative extension service serves Nebraska.
Ec65-435 A Pattern For You
University of Nebraska-Lincoln Extension: Historical Materials
Extension Circular 65-435 illustrates the process of making a pattern to fit your measurements. Includes information on adjusting ready made patterns to fit you.
Ec65-169 Calibrating A Sprayer, C. Fenster, L. Robinson
Ec65-169 Calibrating A Sprayer, C. Fenster, L. Robinson
University of Nebraska-Lincoln Extension: Historical Materials
Extension Circular 65-169 discusses calibrating a sprayer.
Ec65-164 Sulfur Deficiency Of Field Crops In....Nebraska
Ec65-164 Sulfur Deficiency Of Field Crops In....Nebraska
University of Nebraska-Lincoln Extension: Historical Materials
Extension Circular 65-164 discusses sulfur deficiency of field crops in Nebraska.
Ec65-165 The Nebraska Water Quality Survey
Ec65-165 The Nebraska Water Quality Survey
University of Nebraska-Lincoln Extension: Historical Materials
Extension Circular 6-5-165 contains the Nebraska water quality survey.
Ec65-739 Last Minute Fallout Protection For Livestock, Elvin Schultz
Ec65-739 Last Minute Fallout Protection For Livestock, Elvin Schultz
University of Nebraska-Lincoln Extension: Historical Materials
Extension circular 65-739: Last-Minute fallout protection for livestock.
Ec65-646 Make Dairying Pay....The Record Way
Ec65-646 Make Dairying Pay....The Record Way
University of Nebraska-Lincoln Extension: Historical Materials
Extension Circular 65-646: Make dairying pay the record way, how to make a lot of money selling dairy.
Ec65-532 Planning Your Home Extension Club Programs, Mary Rapp
Ec65-532 Planning Your Home Extension Club Programs, Mary Rapp
University of Nebraska-Lincoln Extension: Historical Materials
Extension Circular 65-532 discusses planning your Home Extension Club Programs.
Ec65-443 Leather, Gerda Petersen
Ec65-443 Leather, Gerda Petersen
University of Nebraska-Lincoln Extension: Historical Materials
Extension Circular 65-443 discusses Leather and how to sew with it.
Ec65-830 Governmental Taking Of Farm Lands For Highway Purposes, Harvey Perlman
Ec65-830 Governmental Taking Of Farm Lands For Highway Purposes, Harvey Perlman
University of Nebraska-Lincoln Extension: Historical Materials
Extension circular 65-830: Governmental taking of farm lands for highway purposes. Harvey Perlman later became the Chancellor for University of Nebraska - Lincoln.
Ec65-829 Nebraska Fence Laws, Harvey Perlman
Ec65-829 Nebraska Fence Laws, Harvey Perlman
University of Nebraska-Lincoln Extension: Historical Materials
Extension circular 65-829 describes the Nebraska fence laws. The author went on to be the Chancellor of the University of Nebraska - Lincoln.
Ec65-828 Agricultural Engineer's Digest : Gluing Wood
Ec65-828 Agricultural Engineer's Digest : Gluing Wood
University of Nebraska-Lincoln Extension: Historical Materials
Extension circular 65-828: Agricultural engineers’ digest - gluing wood. Illustrates the best way to glue different types of wood.
Ec65-827 The Beef Cycle, Arnold Nordquist, Howard Ottoson
Ec65-827 The Beef Cycle, Arnold Nordquist, Howard Ottoson
University of Nebraska-Lincoln Extension: Historical Materials
Extension circular 65-827: The Beef cycle. This discusses the cattle cycles that have occured in the cattle population.
Ec65-806 Farm Custom Rates....Paid In Nebraska 1964, Ted Nelson, Darwin Ransom
Ec65-806 Farm Custom Rates....Paid In Nebraska 1964, Ted Nelson, Darwin Ransom
University of Nebraska-Lincoln Extension: Historical Materials
Extension circular 65-806: Farm custom rates paid in Nebraska in 1964.
Ec65-820 Nebraska Farm Management : Summary And Analysis Report.....1964, Larry Bitney
Ec65-820 Nebraska Farm Management : Summary And Analysis Report.....1964, Larry Bitney
University of Nebraska-Lincoln Extension: Historical Materials
Extension circular 65-820: Nebraska farm management summary and analysis report 1964.