T w wolff (5 Ergebnisse)

Paperback. Zustand: Brand New. 53 pages. 8.25x6.00x0.13 inches. In Stock.

Zustand: Fair. This is an ex-library book and may have the usual library/used-book markings inside.This book has hardback covers. 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,650grams, ISBN.…

Data on distribution, ecology, biomass, recruitment, growth, mortality and productivity of the West African bloody cockle Anadara senilis were collected at the Banc d'Aguuin, Mauritania, in early 1985 and 1986. Ash-free dry weight appeared to be correlated best with shell height. A. senilis was abundant on the tidal flats of landlocked coastal bays, but nearly absent on the tidal flats bordering the open sea. The average biomass for the entire area of tidal flats was estimated at 5.5 g m?2 ash-free dry weight. The A. senilis population appeared to consist mainly of 10 to 20-year-old individuals, showing a very slow growth and a production: biomass ratio of about 0.02 y?1. Recruitment appeared negligible and mortality was estimated to be about 10% per year. Oystercatchers (Haematopus ostralegus), the gastropod Cymbium cymbium and unknown fish species were responsible for a large share of this. The distinction of annual growth marks permitted the assessment of year-class strength, which appeared to be correlated with the average discharge of the river Senegal. This may be explained by assuming that year-class strength and river discharge both are correlated with rainfall at the Banc d'Arguin. 11 pp., 11 figs, gr. 8.…

XIV, 505 Seiten. Mit 162 Abbildungen. OLeinen. Ordnungsgemäß aus einer Universitäts-Bibliothek ausgesondert (Stempel, Signatur). Guter Zustand. Gewicht über 1 kg. Sprache: Deutsch Gewicht in Gramm: 1071.

Zustand: Sehr gut. Zustand: Sehr gut | Seiten: 546 | Sprache: Deutsch | Produktart: Bücher | Keine Beschreibung verfügbar.