Aleyev yu g g (5 Ergebnisse)
- Hardcover
Anbieter: Zubal-Books, Since 1961, Cleveland, OH, USAZubal-Books, Since 1961
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EUR 111,55
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Zustand: Good. *Price HAS BEEN REDUCED by 10% until Monday, July 13 (SALE Item)* 441 pp., hardcover, ex library, else text clean & binding tight. - If you are reading this, this item is actually (physically) in our stock and ready for shipment once ordered. We are not bookjackers. Buyer is responsible for any additional duties,…taxes, or fees required by recipient's country. Photos available upon request.
- Softcover
Anbieter: Ria Christie Collections, Uxbridge, Vereinigtes KönigreichRia Christie Collections
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EUR 117,16
EUR 14,07 VersandVersand von Vereinigtes Königreich nach USAAnzahl: Mehr als 20 verfügbar
Zustand: New. In.
- Softcover
Anbieter: Revaluation Books, Exeter, Vereinigtes KönigreichRevaluation Books
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EUR 157,15
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Paperback. Zustand: Brand New. 444 pages. 9.02x5.98x1.00 inches. In Stock.
- Softcover
Anbieter: AHA-BUCH GmbH, Einbeck, DeutschlandAHA-BUCH GmbH
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EUR 114,36
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Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - 1. Nekton as an ecomorphological type of biont The term nekton was suggested and used for the first time in 1890 by E. Haeckel in his book Plankton-Studien. Etymologically the word nekton derives from the Greek VTJKTTJP, i.e. swimming. As Haeckel def…ined it, nekton describes collectively all swimming animals that are 'free to choose their path', i.e. can resist a strong current of water and, distinct from planktonic animals, go where they wish. While giving a general idea of the dividing line between plankton and nekton, Haeckel's definition, which has played an important role in shaping our ideas about nekton, today no longer provides a sufficient basis for ecological and functional morphological investigations, since it affords no possibility of quantitatively assessing either the boundary between plankton and nekton or that between nekton and other ecomorphological types of biont. Thus Parin (1968), proceeding from Haeckel's principle, believes that in the epipelagic zone of the ocean the minimum size of nektonic fishes with a well-developed capacity for active swimming may be between 15 and 30 cm, as fishes shorter than 15 cm are unable to counter oceanic currents. Meanwhile young Leucaspius (Leucaspius delineatus) only 1.5 cm long, observed by this writer in ponds near Moscow proved capable of active horizontal migrations across the entire body of water, which, if Haeckel's definition is accepted, brings the border between planktonic and nektonic fish in this case to between 1.5 and 2.0 cm.
Verlag: Dr. W. Junk, The Hague, 1977
- Hardcover
- Erstausgabe
Anbieter: J. Wyatt Books, Ottawa, ON, KanadaJ. Wyatt Books
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EUR 62,26
EUR 20,15 VersandVersand von Kanada nach USAAnzahl: 1 verfügbar
Hardcover. Zustand: Fine. No Jacket. First Edition. Hardcover; 8vo, 435 pages. FIRST EDITION. Blue cloth hardcovers with gilt lettering on cover and spine. The pages are glossy, bright, and clean. Missing the jacket, but the flap was retained and laid in back. Including numerous illustrations. FINE/--. Book.
