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Glass rich basaltic sand and gravel within the oceanic crust at 220N. Scientific party of the Deep Sea Drilling Project, Leg46

Effects of insularisation on plant species richness in the prairie-forest ecotone

Nature and origin of Late Neogene Mediterranean sapropels in Nature and origin of cretaceous carbon-rich facies.

Manganese-rich rock coatings from Iceland

Plant communities of rich-fen systems in England and Wales. II. Communities of calcareous mires

Paleoenvironmental significance of clay deposits in Atlantic black shales in Nature and origin of cretaceous carbon-rich facies.

The use of domestic herbivores in the conservation of the biological richness of European wetlands

Mise en évidence de deux types de concrétion dans les sols. Les rouges riches en hématite sont considérées comme héritées d'une pédogénèse antérieure, les noires riches en oxyde de manganèse seraient néoformées dans un pédoenvironnement actuel

Plant communities of rich-fen systems in England and Wales. I. Introduction. Tall sedge and reed communities

O vtoricnom osoloncevanii i sodovom zasolenii hloridnyh soloncov pri orosenii. (Remaniement des solonetz à chlorures sous l'action d'eau d'irrigation riche en sodium)

Progressive ventilation of the oceans. Potential for return to anoxic conditions in the Post-Paleozoic in Nature and origin of cretaceous carbon-rich facies.

Wild is beautiful. (Introduction to the magnificient, rich and varied fauna and Wildlife of Nepal). A compendium during Trekking and visiting Wildlife Observatories.

DES OXYDES DE FER FOURNIS PAR DES FORMATIONS ANCIENNES RICHES EN FER. LES GRESIFICATIONS SEMBLENT DONC LIEES, GENETIQUEMENT, A D'AUTRES FORMATIONS RICHES EN FER: GRAVILLONS, COLOR-BANDING, ALTERITES ET CUIRASSES. LEUR ELABORATION S'ETEND DU PLEISTOCENE

les milieux humides est probablement dû à une migration du fer et du soufre à partir des dépôts du Tertiaire riches en pyrite ou à partir des moraines mélangées à des éléments du Tertiaire et à une précipitation du fer et du soufre, sous forme de
pyrite, dans les sédiments riches en matière organique.

The bird faunas of two vegetation gradients ranging from open grassland to high forest were compared in southern France and Corsica. On the whole, species richness is lower (ca 30 %) in Corsica than on the mainland. However, a low bird species
richness does not characterize all Corsican habitats. Moreover, the bird communities of Corsican shrubby habitats are closer in their diversity and frequency distribution to mainland bird forest communities than to the bird communities of mainland shrubby

accelerate leaching of Ca Co. In this process dune sand, moderately rich in carbonates and poor in silt and clay, becomes decalcified and enriched in silt and clay from dust. Further pedogenesis may lead to the formation of Hamra (Typic Rhodoxeralf
). In the dry area dune sand rich in CaCO is also stabilized, but no prominent changes occur in composition. This material may be the parent material of Kurkar (calcareous sandstone).

After a brief review of the concept of biogeography, the authors deal at length with the problem of levels of perception and examine the general relations between area and species richness by means of a great number of data from sample spots
-mountainous landscape of southern France. In this area, 26 biotopes were defined. The questions to be answered were: what is the accuracy of the observed species richness at both levels of perception: that of each biotope in particular and that of the 26

La productivité et le cycle des éléments nutritifs des écosystèmes forestiers riches et pauvres en ces éléments ne présentent pas de fortes différences tant que les écosystèmes ne sont pas perturbés. Lorsque les forêts sont abattues en vue d'une
mise en valeur agricole, les systèmes pauvres perdent rapidement leur potentiel de productivité, à la différence des systèmes riches. (MI).

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