1,720,972 research outputs found
A Second Specimen Record of Red-Shouldered Hawk (\u3ci\u3eButeo lineatus\u3c/i\u3e) from Nebraska
Get PDFOn 9 February 1989, while walking in a wooded area of the Sass Farm (Nebraska: Otoe County; extreme northwest corner of county, T9N, R9E, Section 5), Robert and Hope Sass and Liz Otradovsky discovered a dead hawk they could not identify. Telephone conversations with Liz Otradovsky and instructions on how to legally transport the hawk to the University of Nebraska Museum (UNSM) resulted in delivery of the specimen. The specimen was well preserved and showed little or no sign of deterioration, drying, or scavenging by predators that would result from laying outside for a long period of time. It is probable that the bird had not been dead long when found. Identification of the specimen proved initially difficult for the author as well. Consultation of The Birds of Minnesota (Roberts, 1955) and its key to the species of birds of Minnesota revealed the specimen to be an immature Red-shouldered Hawl (Buteo lineatus)
Book Reviews of \u3ci\u3eBird Navigation: The Solution of a Mystery?\u3c/i\u3e, \u3ci\u3eThe Last of the Curlews\u3c/i\u3e, \u3ci\u3eA Naturalist\u27s Sketchbook\u3c/i\u3e, \u3ci\u3eBird Walk Through the Bible\u3c/i\u3e, \u3ci\u3eLife Histories of North American Petrels and Pelicans and their Allies\u3c/i\u3e and \u3ci\u3eLove of Loons\u3c/i\u3e
Get PDFBird Navigation: The Solution of a Mystery?, R. Robin Baker, 1984, Holmes & Meier Publishers, Inc., New York. vi + 256 pp., ISBN 0-340-33416-9, softcover, no price given. Originally published by Hodder & Stoughton Ltd. in Great Britain but handled in the United States by Holmes & Meier Publishers, Inc., Import Division, IUB Building, 30 Irving Place, New York, NY 10003.
R. Robin Baker, Reader in Zoology at the University of Manchester, is a noted authority on avian navigation. The word solution in the title of this book is somewhat misleading because this book does not solve the mystery of how birds navigate. However, this book is the most thorough, up-to-date review of the various theories on how birds navigate, and integrates these theories to give the reader an idea of how birds might really navigate. The author does an excellent job of presenting all the different ideas in an easily understood and easy to read style. Discussions of each theory include some of the history behind the research, how each theory fits with other theories, how each theory might work on short and long distance movements, and what research needs to be conducted in the future to help clarify how birds navigate. The book explains how birds might navigate under one set of conditions and switch to another navigation technique when conditions change. A fascinating topic presented in a very readable manner.
The Last of the Curlews, Fred Bodsworth, illustrated by T. M. Shortt, x + 144 pp., 6 x 9, Dodd Mead & Co., N.Y. 8.95 soft cover.
This is a reprint, with a foreword by Dr. Harold D. Mahan, and as part of the Edwin Way Teale Library of Nature Classics, of a book originally published in 1955. At that time it was thought (fortunately, incorrectly) that the Eskimo Curlew was extinct, and this is the story of a year in the life of the last bird. Ascribing human-type thoughts and reactions to the bird helps to carry the story along and doesn\u27t seem to be overdone. It is interesting reading and the illustrations are very nice, and, presently at least, one can keep in the back of his mind that the Eskimo Curlews are still in existence. The author is careful to distinguish between Hudsonian Curlews and Whimbrels , but A. O. U. combined them after the book was written
A Black-Bellied Whistling Duck Specimen from Nebraska
Get PDFOn 29 October 1989 John Andersen of Ong, Nebraska, shot and killed an adult male Black-bellied Whistling-Duck while duck hunting at Hansen Waterfowl Production Area, 3 miles north and 1 mile west of Ong, Clay Co., Nebraska (T6N R5W Section 35). Andersen\u27s brother-in-law, Stewart Porterfield of Lincoln, was present at the time and tentatively identified the specimen but returned to their vehicle to get a bird book for reference (Porterfield, pers. comm. 2 November 1989). Mr. Porterfield took the frozen, intact duck specimen to the Nebraska Game and Parks Commission office in Lincoln where it was recommended that the specimen be deposited at the University of Nebraska State Museum (UNSM).
The frozen specimen was delivered and donated to UNSM (Accession Z-1989-55) by Mr. Porterfield on 2 November 1989. The specimen was prepared as a standard study skin and partial skeleton by the author on 7 November 1989 and catalogued into Division of Zoology\u27s collections as UNSM ZM-16079.
Dendrocygna autumnalis (Linnaeus), the Black-bellied Whistling-Duck, is not on the official list of birds in Nebraska (N.O.U.R.C., 1988, 1989) and was not listed as even hypothetical in a critically evaluated list of Nebraska birds (Bray et al., 1986). However, Black-bellied Whistling-Ducks, whose normal range is from southern Arizona and southern Texas south to southern Brazil and Argentina, have wandered north, including to Kansas, Iowa, and Michigan (AO.U., 1983). There are three records of this species in Kansas (Thompson & Ely, 1989) and a recent sighting in Minnesota that is under consideration of the Minnesota Ornithologists\u27 Union Records Committee (Tveten, 1989). A written description and photographs of UNSM ZM-16079 have been submitted to the Nebraska Ornithologists\u27 Union Records Committee for consideration
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Cassin’s Sparrow in Garden County
Get PDFOn 21 May 1986, while searching for evidence of breeding birds in atlas block 2G04 near Lisco, Garden County, Nebraska, I discovered a Cassin’s Sparrow (Aimophila cassinii). This sighting was at 5:20 PM Mountain Daylight Time, along the county road in the northeast corner of Section 11. I was driving slowly down the road and stopped to observe an odd sparrow. I nearly drove past, thinking it was another Grasshopper Sparrow (Ammodramus savannarum), which I had heard and seen all day. The sparrow, which appeared larger than a Grasshopper Sparrow, was perched on the low wire of a barbed wire fence along the road. In the few moments before the bird disappeared into the grass I observed that it was plain-breasted, had dark “whiskers” and tail, a grayish back, pinkish-yellow legs, and yellow at the bend of the wing. As it flew away into the grass it sang a short song. After I consulted my field guide I presumed this bird to be a Cassin’s Sparrow, but I wanted a second and better look. “Pishing,” owl imitations, squeaking, etc., failed to return the bird to view. Remembering the short song, I played Peterson’s field tapes in an attempt to match the song. When I played the recording of a Cassin’s Sparrow the bird flew overhead (about 10 feet high) and sang a matching song to the tape’s. I did this several times and the Cassin’s .Sparrow sat on the wire fence between the tape-playings, scolding me with sharp, short, rapid, chipping notes. During these sittings I was able to see all field marks with a 22x spotting scope at a range of 30 to 40 feet: the lightly streaked crown, flat profile of the head, darkish line through the eye, with light above the eye. Because the bird was singing and behaving defensively to another song of the same species I presume this bird to have been a territorial male, which possibly bred this year
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