Beam b d (5 risultati)

Hardcover. Condizione: Very Good. 1st Edition. HARDBACK BOOK IN VERY GOOD CONDITION,NAME [small] ON FIRST BLANK PAGE.

Condizione: Very Good. 13 pages. An authentic standalone article, extracted from a larger volume. Not a reprint or reproduction, but an original work in its own right. Preserved in a modern card cover, prepared for practicality - an unassuming but serviceable presentation that favours function over finery. Size: 14 x 22 cms. Category: Institution of Civil Engineers; Cosmo Books : 29 years on ABE, 47 years taking care of customers. A bookseller you can rely on. Softcover (Booklet - Unbound Pages).…

Condizione: Very Good. 8 pages. An authentic standalone article, extracted from a larger volume. Not a reprint or reproduction, but an original work in its own right. Preserved in a modern card cover, prepared for practicality - an unassuming but serviceable presentation that favours function over finery. Size: 14 x 22 cms. Category: Manchester Philosophical Society; Cosmo Books : 29 years on ABE, 47 years taking care of customers. A bookseller you can rely on. Softcover (Booklet - Unbound Pages).…

Soft cover. Condizione: Very Good. VG. Slight damp-staining to covers & internally, mild edgewear, else a very attractive copy. Cover art by Hubert Rogers.

The habitat, life cycle, behaviour, and food of five species of caddisflies of the genus Neophylax (N. aniqua Ross, N. ornatus Banks, N. concinnus McLachlan, N. oligius Ross, and N. fuscus Banks) were compared, based on general surveys and biweekly to monthly samples from several stream systems in southern Ontario. Larvae of four of the species, N. aniqua, N. concinnus, N. oligius, and N. fuscus, occur sequentially from the headwaters downstream and grow from late autumn through spring, but differ slightly in temporal development; adults of these species emerge in September and October, after a summer prepupal diapause. Larvae of the fifth species, N. ornatus, grow in late summer and autumn; their habitat coincides with portions of the habitats of N. aniqua and N. concinnus in cool headwater sections of streams, but adults emerge in June following a winter diapause. These species also differ in duration of diapause, case construction, location of pupal cases, and oviposition. All species graze on algae and fine organic particles from exposed surfaces of rocks. The study demonstrates that the five species of Neophylax studied differ in larval habitat and in time of development in ways that tend to keep them separate in stream systems. Evolutionary implications are considered. 14 pp., 12 figs, 4.…