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Diving Birds Of North America: 1 General Attributes And Evolutionary Relationships, Paul A. Johnsgard

Diving Birds of North America by Paul A. Johnsgard

Loons, grebes, and auks comprise a rather large number of species of aquatic diving birds that are fairly unfamiliar to most people, inasmuch as they tend to spend much of their time well away from shore and, when approached on the water, usually dive inconspicuously and reappear a considerable distance away. Thus in many areas grebes, simply called "helldivers," are often confused with coots or even diving ducks. Many people know loons only by their wild, penetrating cries and romantically associate them with northern woods and lakes, while auks are symbolic of arctic coastal cliffs. But ornithologists can find fascinating …

Diving Birds Of North America: 4 Comparative Diets And Foraging Ecologies, Paul A. Johnsgard

Diving Birds of North America by Paul A. Johnsgard

Auks, loons, and grebes are birds whose anatomies and behaviors have been sharply influenced by their foraging niche adaptations. In each species these have evolved through natural selection over extended periods of geologic time as a reflection of available food resources, the presence of competing species, and the limitations on innate variations in anatomy, physiology, and behavior imposed by available genetic mutations and recombinations. To a very considerable degree the auks, loons, and grebes seem to have adjusted to the effects of interspecific competition by evolving differences in bill shape and body size that sometimes open specific new foraging niche …

Diving Birds Of North America: Species Accounts — Auks (Alcidae), Paul A. Johnsgard

Diving Birds of North America by Paul A. Johnsgard

Auks are small to medium-sized diving birds having bills that are variably pointed and compressed but never acuminate and are sometimes covered with colorful horny sheaths in breeding adults. Feathering densely covers the lores and often extends to the nostrils, which vary from linear to oval. There are 10 functional primaries and 15–19 secondaries; the greater secondary and primary coverts are usually lengthened. Molting of the primaries is usually simultaneous but is gradual in some species; the wings are used for underwater propulsion, and the feet are then used mainly for steering. The 12–18 rectrices are short and normal in …

Diving Birds Of North America [Complete Book], Paul A. Johnsgard

Diving Birds of North America by Paul A. Johnsgard

Considering the great nostalgic attraction of such birds as the common loon for people who have lived at least part of their lives around the lakes of Canada and the northern United States, and given the endearing visual appeal of species like puffins and auklets, it is rather surprising that there are so few books on these groups of aquatic birds. During my childhood summers at our Minnesota lake cottage I used to spend hours watching loons and red-necked grebes, and I marveled at their wonderful diving ability and powerful voices. Much later, the wild puffins and massed breeding colonies …

Diving Birds Of North America: 6 Comparative Life Histories And Reproductive Success Rates, Paul A. Johnsgard

Diving Birds of North America by Paul A. Johnsgard

It is now well recognized that, like behavior, a species' life history characteristics, such as age at sexual maturity, clutch sizes, and incubation, brooding, and fledging patterns, are evolved traits that may be strongly influenced by a variety of ecological factors. Within the auks, loons, and grebes one can find variations in the age at sexual maturity and time of first breeding ranging from as little as 1 to as many as 5 or 6 years, average clutch sizes that range from 1 to 4 eggs, and substantial variations in adult survival rates and maximum longevity. However, compared with such …

Book Reviews- Nebraska Bird Review March 1987

Nebraska Bird Review

Wildlife 2000 Modeling Habitat Relationships of Terestrial Vertebrates, edited by Jared Verner, Michael L. Morrison, and C. John Ralph, 496 pp., 9 x 11 1/2, The University of Wisconsin Press, Madison, Wis., bibliography, indexed, cloth, $17.50.

This book is based on the proceedings of a symposium at Stanford Sierra Camp, California, in 1984. Not all papers presented there are included; those that are were revised to reflect reactions to the presentations, and some additional papers were added to round out the presentation. The sixty papers are presented in several sections: Development, Testing, and Application of Wildlife-Habitat Models; Biometric Approaches to …

Wpa News 15 (1987), World Pheasant Association

Galliformes Specialist Group and Affiliated Societies: Newsletters

WPA News (March 1987), number 15

Published by the World Pheasant Association

Aspects Of Selection For Performance In Several Environments With Heterogeneous Variances, D. J. Garrick, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

Dairy cattle evaluation schemes routinely assume homogeneous variance with respect to environment. Increasing evidence suggests the presence of systematic changes in variance components associated with mean level of performance. Best linear unbiased prediction procedures that account for heterogeneity are reviewed. The consequences of incorrectly assuming homogeneity for evaluation are demonstrated for a progeny test and an artificial breeding program that screens dams of sires from heterogeneous populations. Selection assuming homogeneity can be very efficient when heritability, and therefore accuracy of selection, is greatest in the more variable environment. Conversely, appreciable reduction in response results when heritability is greater in the …

Kentucky Warbler (Vol. 63, No. 1), Kentucky Library Research Collections

The Kentucky Warbler

No abstract provided.

Contingency Analysis Of The Agonistic Behavioral Sequence In Sceloporus Undulatus Hyacinthinus, Deborah Allison

Masters Theses & Specialist Projects

A contingency analysis of the sequence of actions associated with agonistic behavior of resident and introduced male Sceloporus undulatus nya irthirus was carried out to determine the degree of stereotypy. During the time period April to June 1984 and 1985, caged pairs of adult male and juvenile female lizards were filmed on three occasions in order to gather data on resident males not involved in aggressive interactions. During the same threemonth time period, a different nonresident male was introduced singly into a given resident's cage on three occasions and the interactions filmed. The films were analyzed to determine which actions …

Western Rock Lobster Industry Compensation Study. Report To The Rock Lobster Industry Advisory Committee By Arthur Young Services., Arthur Young Services

Fisheries Management Papers

Terms of reference are outlined in letter dated 11 August 1986. The Fisheries Department seeks to reduce western rock lobster fishing capacity to ensure the long-term viability of the fishery and has asked us to evaluate the financial implications of a number of specific resource management proposals.

Sdsu Dairy Digest, South Dakota State University Dairy Club

Dairy Digest

No abstract provided.

1987 South Dakota Beef Report, Department Of Animal And Range Sciences, South Dakota State University, Agricultural Experiment Station, South Dakota State University, Cooperative Extension Service, South Dakota State University

South Dakota Beef Report, 1987

This is the complete 1987 South Dakota Beef Report.

Comparison Of The Diet, Feeding Behavior, And Habitat Use Of Mallards (Anas Platyrhynchos) And Black Ducks (Anas Rubripes), Michael J. Bennett

Biology Honors Papers

No abstract provided.

Reproduction And Early Development Of A Hermaphroditic Unionid : Uniomerus Tetralasmus (Say, 1831), Joan E. Burton

Theses, Dissertations and Capstones

A population of a midwestern naiad, Uniomerus tetralasmus was discovered in West Virginia in 1984. A survey of this disjunct population was undertaken between May and December 1986. A study of the reproductive and early developmental stages was the primary objective. A description of the morphology, a shell aberration, a study of its ability to estivate, a correlation between sex types in lentic and lotic environments and explanations for its expansion to West Virginia are included as well. When permanent slides were made of the naiad's reproductive organs, the naiad was found to be a functional hermaphrodite. Eggs and sperm …

Division Pinophyta, Stanley L. Welsh, N. Duane Atwood, Sherel Goodrich, Larry C. Higgins

Great Basin Naturalist Memoirs

No abstract provided.

Tuna Fishery In The East Central Atlantic Region: The Feasibility Of Nigeria's Participation, Aderemi Olasupo Abioye

Marine Affairs Theses and Major Papers

Tuna fishery is widely practiced in the east central Atlantic region by many fleets of different nationality. Most of the catch is taken by distant-water fleets. The new Law of the Sea convention, which gives coastal states an exclusive economic zone with outer limit of 200 miles, now allows the coastal states to make the most use of the living resources in their waters. The surplus shall be allocated to other states in the region and those traditionally fishing in the area before. Nigeria with a population of about 100 million people spends substantial foreign exchange annually on the importation …

An Analysis Of The Massachusetts Inshore Lobster Fishery, Peter Robertson Hoar

Marine Affairs Theses and Major Papers

The purpose of this thesis was to explore the limited entry alternative of fishery management by examining the history of a particular limited entry scheme: the Massachusetts inshore commercial lobster fishery license limitation law. A review was made of existing limited entry theory, followed by a description of limited entry programs extant in U.S. fisheries. The legislative and political histories of the Massachusetts lobster fishery limited entry program was then examined. The limited entry law was then analyzed by comparing what actually occurred with what is supposed to occur according to limited entry theory. A quantitative analysis of changes in …

Project Reports 1987-1991, Various Authors

Annual Reports

No abstract provided.

Fisheries Report No 76 - The Australian Herring Fishery In Western Australia, 1973 - 1985, Michael H. Walker, Diane P. Clarke

Fisheries Research Reports

The Australian herring (Arripis georgianus) ts a pelagic, largely marine, species which is relatively abundant in the south western waters of Western Australia. It is a close relative of the Australian salmon with a similar life history and habits which includes migrating for the purpose of spawning. The Australian herring is keenly sought both as a food fish and for bait. This report documents the fishery for this species as it has developed during the period 1973 to 1985.

Fisheries Report No 75 - The Commercial Shark Fishery In Temperate Waters Of Western Australia, D. I. Heald

Fisheries Research Reports

The Western Australian-based mixed gear fishery for edible shark generally operates from Geraldton to Esperance in waters shallower than 10 fm to a maximum depth of 100 fm. In 1983/84, the total catch was 1262 tonnes live weight. The total shark catch was taken by 158 gillnet boats, 45 longline boats and 152 handline boats. However, nearly two thirds (62%) of these boats caught 1 tonne or less in 1983/84 and were assumed to rely more heavily on other target fisheries than shark.

Of the 20 or so species of shark caught in W.A., 3 species together comprise two thirds …

Cartographic Trend Analysis Of Furbearer Harvest Distributions In Arkansas, C. Renn Tumlison, Mark Trail, V. Rick Mcdaniel

Journal of the Arkansas Academy of Science

Average by-county fur harvest for the last nine harvest seasons (1977-1985) was used as data points to be interpolated using nearest neighbor algorithms in computer-assisted trend analyses. COMPLOT maps were produced which represented a surface of harvest densities drawn over a map of Arkansas. Twelve furbearer species are examined, and "topographic" features of harvest density for each are interpreted in terms of ecology and/or buyer distribution. The trend surface technique removed some of the error inherent to harvest records, and produced an aesthetic graphical display of the information that was more easily interpreted and explained than other methods of analysis …

Report Of The Rock Lobster Industry Advisory Committee Meeting Of 27 January 1987 - Report By The Chairman Mr. B.K. Bowen., B. K. Bowen

Fisheries Management Papers

The Rock Lobster Industry Advisory Committee met in Perth on Tuesday 17 January 1987. Committee discussed the following: Policy on 5% pot loss on replacement of vessels less than six years old. Study of industry funded compensation mechanism for fishing capacity reductions. 20 Fathom rule. Future maintenance of the zone E boundary. The recreational Rock Lobster Fishery. Rock Lobster pot distribution. Options for a 10 per cent reduction in fishing effort. 1987 coastal tour. Augusta-Windy Harbour Rock Lobster Working Group. Report on the 1986/87 season.

Fisheries Report No 77 - The Western Rock Lobster Fishery 1983 - 1984, R. S. Brown, E. H. Barker

Fisheries Research Reports

The fishery for the western rock lobster Panulirus cygnus is one of the most important single fisheries in Australia and an important export earner for the State. Western Australia produced 10,576 tonnes in 1983/84, out of a total Australian rock lobster catch, with the exception of Queensland, of 15,777 tonnes. The fishery is governed by a complex set of regulations which are designed to limit the total fishing effort to acceptable levels and to enforce a legal minimum size (Bowen 1971, Hancock 1981). Thus, it is important to monitor the state of the fishery constantly both to ensure that the …

Fisheries Report No 79 - The Western Rock Lobster Fishery 1984 - 1985, R. S. Brown, E. H. Barker

Fisheries Research Reports

The fishery for the western rock lobster Panulirus cygnus is one of the most important single fisheries in Australia and an important export earner for the State. Western Australia produced 8,966 tonnes in 1984/85, out of a total Australian rock lobster catch (excluding New South Wales and Queensland) of 13,651 tonnes. The fishery is governed by a complex set of regulations which are designed to limit the total fishing effort to exceptable levels and to enforce a legal minimum size (Bowen 1971, Hancock 1981). Thus, it is important to monitor the state of the fishery constantly both to ensure that …

Fisheries Report No 78 - A Re-Examination Of The Methods Used For Handling Undersize Western Rock Lobsters, R. S. Brown, C J. Dibden

Fisheries Research Reports

The fishery for the western rock lobster, Panulirus cygnus (George) is the most important single species fishery in Australia, and one of the major rock lobster fisheries of the world, with catches over the last ten years (1973 to 1983) averaging approximately 9.8 million kg annually.

The continuing success of the fishery can be attributed mainly to effective management, which involves a complex system of regulations, the majority of which were introduced in 1963 and which are constantly being revised to accommodate changes in the fishery. One important piece of legislation, effective from 17 December 1965, was the introduction of …

Key To Subject Areas, Stephen L. Wood, Donald E. Bright Jr.

Great Basin Naturalist Memoirs

No abstract provided.

Full Issue, Vol. 9

Great Basin Naturalist Memoirs

No abstract provided.

Acknowledgments, Stanley L. Welsh, N. Duane Atwood, Sherel Goodrich, Larry C. Higgins

Great Basin Naturalist Memoirs

No abstract provided.

General References, Stanley L. Welsh, N. Duane Atwood, Sherel Goodrich, Larry C. Higgins

Great Basin Naturalist Memoirs

No abstract provided.