Quelques problemes de paleogeographie alpine

Rodolphe Trumpy

doi:10.2113/gssgfbull.s6-vii.4-5.443

Quelques problemes de paleogeographie alpine

BSGF - Earth Sciences Bulletin ◽

10.2113/gssgfbull.s6-vii.4-5.443 ◽

1957 ◽

Vol S6-VII (4-5) ◽

pp. 443-461 ◽

Cited By ~ 1

Author(s):

Rodolphe Trumpy

Keyword(s):

Essential Characteristic ◽

Crustal Movements ◽

Alpine Zone ◽

The Alps

Abstract A criticism of the theory of embryonic precursory folding in the Alps, based on some examples from Helvetic, Pennine, and Prealpine zones in Switzerland and Savoy, France. The importance of Mesozoic flexures and faults is stressed, as well as the absence of any indications of tangential crustal movements before the Cretaceous and the presence of evidence proving the instability of the paleogeographic elements of the Alpine zone. The thick masses of Alpine schists are not mainly "comprehensive series," but deposits accumulated rapidly in a relatively brief period of time. The essential characteristic of the Alpine geosyncline was mobility rather than subsidence.

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Anatomical Characteristics and Ecological Trends in the Xylem and Phloem of Brassicaceae and Resedacae

IAWA Journal ◽

10.1163/22941932-90000164 ◽

2006 ◽

Vol 27 (4) ◽

pp. 419-442 ◽

Cited By ~ 12

Author(s):

Fritz Hans Schweingruber

Keyword(s):

Western Europe ◽

Life Forms ◽

Reaction Wood ◽

Lower Altitude ◽

Alpine Zone ◽

Brassicaceae Species ◽

Ray Cells ◽

The Alps ◽

The Hill ◽

Vestured Pits

The xylem and phloem of Brassicaceae (116 and 82 species respectively) and the xylem of Resedaceae (8 species) from arid, subtropical and temperate regions in Western Europe and North America is described and analysed, compared with taxonomic classifications, and assigned to their ecological range. The xylem of different life forms (herbaceous plants, dwarf shrubs and shrubs) of both families consists of libriform fibres and short, narrow vessels that are 20–50 μm in diameter and have alternate vestured pits and simple perforations. The axial parenchyma is paratracheal and, in most species, the ray cells are exclusively upright or square. Very few Brassicaceae species have helical thickening on the vessel walls, and crystals in fibres. The xylem anatomy of Resedaceae is in general very similar to that of the Brassicaceae. Vestured pits occur only in one species of Resedaceae.Brassicaceae show clear ecological trends: annual rings are usually distinct, except in arid and subtropical lowland zones; semi-ring-porosity decreases from the alpine zone to the hill zone at lower altitude. Plants with numerous narrow vessels are mainly found in the alpine zone. Xylem without rays is mainly present in plants growing in the Alps, both at low and high altitudes. The reaction wood of the Brassicaceae consists primarily of thick-walled fibres, whereas that of the Resedaceae contains gelatinous fibres. The frequency of sclereids in Brassicaceae bark is an indicator of ecological differences: sclereids are rare in plants from the alpine zone and frequent in plants from all other ecotones.

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Oribatid mites (Acari: Oribatida) from the Sella massif (Dolomites, Trentino, Italy) with description of Trichoribates valeriae n. sp. (Ceratozetidae)

Acarologia ◽

10.24349/acarologia/20204405 ◽

2020 ◽

Vol 60 (4) ◽

pp. 842-862

Author(s):

Heinrich Schatz

Keyword(s):

Lamellar Structure ◽

Systematic Position ◽

Oribatid Mites ◽

General Distribution ◽

Cushion Plant ◽

Alpine Zone ◽

Large Numbers ◽

The Alps ◽

Porose Area ◽

Boreal Climate

Results from collections of oribatid mites in the cushion plant belt of Sass Pordoi and Piz Boè in the Italian Dolomites (Prov. Trento) are presented. A total of 10 oribatid species belonging to seven families were found. Most have a wide general distribution, Anachipteria shtanchaevae is restricted to the Alps. Three species are frequently or mainly found in the montane to alpine zone (A. shtanchaevae, Camisia horrida, Oribatula interrupta). Remarkable findings are Camisia foveolata, hitherto only known from the boreal climate zone, which indicates a preglacial relict distribution, and Kunstidamaeus lengersdorfi as highest recorded altitude for this species. Trichoribates valeriae n. sp., found in large numbers on both mountains, is described and compared with other congeners, and its systematic position is discussed. This species is characterized by a lamellar structure with small ridges and widely separated cusps, rounded rostrum with nose-like protuberance, 10 pairs of medium long notogastral setae with short bristles, notogastral porose area A1 divided in two parts, porose areas present on all tibiae and tarsi. Additional morphological information on the presence of porose areas on tarsi of Trichoribates scilierensis Bayartogtokh and Schatz, 2008 is given.

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