struhsaker (11 Ergebnisse)

Hardcover. Zustand: Good. No Jacket. Former library book; Pages can have notes/highlighting. Spine may show signs of wear. ~ ThriftBooks: Read More, Spend Less.

Zustand: Fair. B/w Illustration (illustrator). This is an ex-library book and may have the usual library/used-book markings inside.This book has hardback covers. Book contains pencil markings. In fair condition, suitable as a study copy. No dust jacket. Please note the Image in this listing is a stock photo and may not match the covers of the actual item,800grams, ISBN:0226777693.

1997. Botany, Natural History, Conservation, Africa. University Press of Florida. Very good - fine cloth and dust jacket 434p.

1997. Botany, Natural History, Conservation, Africa. University Press of Florida. Very good - fine cloth and dust jacket 434p.

HARDCOVER. First edition. 311pp, b/w illustrations, text figures, cloth octavo. Wildlife Behavior and Ecology Series. owners name and stamp, slight cover wear, stain to rear otherwise very good-.

Aquaculture 2: 53-88, 11 figs 8vo, offprint, a bit used.

Hardcover. Zustand: Fine. No Jacket. 1st Edition. Large 8vo, i-xxvi, 349 pp, 36 colour plates, tables etc throughout, laminated boards ( no dust wrapper was issued ), a fine copy.

8 pp., 1 fig., 1 tab., gr. 8.

Zustand: As New. xxvi, 349, 36 col photos, text figs. . HB. As new. . [9780198529583].

The intraspecific variation in shell sculpture of Littorina picta Philippi was studied. The morphological variation in external sculpture appears genetically associated with certain physiological variations. Both types of variation are correlated with particular supratidal environments. The smooth-form populations predominate on low angle benches with heavy horizontal wave force, while the sculptured-form populations predominate on high angle benches receiving spray and slight horizontal wave force. Populations with intergrades in shell sculpture occur on intermediate substrata. Larvae from different sculpture populations of L. picta were reared under the same laboratory environmental conditions. The larvae vary in shell morphology, shell size, growth rate and mortality rate. Progeny of larvae from parents with sculptured shells have a higher growth rate and lower mortality rate than larvae from smooth parents. The progeny of sculptured parents have heavily sculptured, larger shells; the progeny of smooth parents, almost no sculpture and small shells; progeny of intermediate parents, intermediate shell sculpture and size. The rearing experiments indicate that the shell variations have a genetic basis independent of any environmental effect. The major environmental factor selecting for the shell variations are probably: wave action, prolonged submersion, desiccation, high temperature and extreme salinity. These factors appear to act most strongly against settling larvae, post-veligers and juvenile stages within the supratidal environment. The shell sculpture variation may be an example of balanced, adaptive polymorphism maintained by differential selection and non-random mating within two major types of supratidal habitats in the Hawaiian islands. The variation between supratidal environments from winter to summer may be one of the most important balancing mechanisms of the polymorphism. 22 pp., 12 figs, gr. 8.

pp.xxii, 434 with b/w. photos. and figs. 8vo. Ownership insc. to front pastedown. Minor spotting to fore-edges of text block o/.w a fine hardback in fine dw., with a hint of sunning to spine. Summarizes 20 years of research in the Kibale forest in Uganda. This work differs from most logging studies by emphasizing the fauna rather than looking only at the commercially valuable timber species, and offers an in-depth synthesis of the consequences of selective logging in the tropics.