Strayer d l (4 Ergebnisse)
- Softcover
Anbieter: Antiquariaat Schot, Hendrik-Ido-Ambacht, NiederlandeAntiquariaat Schot
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Original publisher's sewn paperback, pictorial frontcover, large 8vo: xij, 396pp. 21 contributionswith footnotes & references - graphs - tables - conclusions, index. Spine some wear.
Verlag: Teachers College, Columbia University, New York 1942
- Hardcover
- Erstausgabe
Anbieter: The Chatham Bookseller, Madison, NJ, USAThe Chatham Bookseller
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Hardcover. Zustand: Very Good. No Jacket. First Edition. 581 pp. including index. Maroon cloth with gold lettering on front and spine. Spine faded and slight rubbing to extremities. Square and tight. Text is clean but for some ink underlining and marginal notes on three early pages not affecting legibility. Owner's name on front… free end paper. Prepared by the Division of Field Studies Institute of Educational Research, Teachers College, Columbia University. Replete with charts and tables of survey data, black and white photographs, and a map of population changes in Newark. Recommendations made to operate the Newark public school system under a reduced wartime budge without compromising on educational quality and educating and training students to be prepared for wartime industries and military service. Size: 8vo. Book.
- Hardcover
Anbieter: moluna, Greven, , Deutschlandmoluna
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Gebunden. Zustand: New. KlappentextThis work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original w.
Anbieter: ConchBooks, Harxheim, , DeutschlandConchBooks
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We studied the microhabitats of six species of freshwater mussels, including two rare species of Alasmidonta, in the Neversink River, New York. In each of 270, 1-m2 quadrats, we measured water depth, current speed, bottom roughness, spatial variation in current speed, distance to shore, presence or absence of macrophytes, presen…ce or absence of an overhead canopy, the extent of patches of fine sediment, and sediment granulometry, as well as recording the mussels present. Mussel populations in the Neversink are dense (mean=3.2/m2) and highly clumped. Stepwise discriminant analyses showed that current speed and spatial variation in current speed were the most useful predictors of the occurrence of mussels in quadrats. Alasmidonta heterodon was found most frequently at moderate current speeds and in quadrats that contained many patches of fine sediments. Alasmidonta varicosa occurred most frequently at moderate current speeds and in sediments with a high proportion of medium sands (0.25-1 mm). Nevertheless, the predictive power of discriminant models based on microhabitat variables is so low that we question the adequacy of a traditional microhabitat approach to unionacean ecology. We suggest that including geomorphological descriptors of the streambed or working at spatial scales of hundreds of metres might be more useful than a traditional microhabitat approach for predicting the distribution of freshwater mussels in streams. 12 pp., 6 figs, gr. 8.
