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Université de Neuchâtel

Discrepancies in Growth Measurement Methods of Mosses : An Example from Two Keystone Species Grown under Increased CO2 and N Supply in a Restored Peatland

Siegenthaler, Andy ; Buttler, Alexandre ; Grosvernier, Philippe ; Gobat, Jean-Michel ; Mitchell, Edward A. D

In: American Journal of Plant Sciences, 2014, vol. 5, no. 15, p. 2354-2371

Bryophytes dominate northern peatlands. Obtaining reliable measurements of moss-growth and how it may be affected by global changes are therefore important. Several methods have been used to measure moss-growth but it is unclear how comparable they are in different conditions and this uncertainty undermines comparisons among studies. In a field experiment we measured the growth and production of...

Université de Neuchâtel

Fonctions multiples, contraintes multiples : les défis du nouveau paradigme de gestion des zones alluviales suisses

Nedelcu, Mihaela ; Hainard, François ; Guex, Dominique ; Gobat, Jean-Michel

In: Natures Sciences Sociétés, 2007, vol. 15, no. 1, p. 3-12

Les zones alluviales constituent un objet environnemental complexe, très révélateur des enjeux sécuritaires, culturels, économiques et écologiques à l'œuvre dans la gestion actuelle des cours d'eau. Cet article, construit sur les résultats d'une recherche interdisciplinaire récente, interroge, à travers trois études de cas, sur la transformation des modes de gestion des cours d'eau en...

Université de Neuchâtel

Factors modulating cottongrass seedling growth stimulation to enhanced nitrogen and carbon dioxide : compensatory tradeoffs in leaf dynamics and allocation to meet potassium-limited growth

Siegenthaler, Andy ; Buttler, Alexandre ; Grosvernier, Philippe ; Gobat, Jean-Michel ; Nilsson, Mats B. ; Mitchell Edward A. D.

In: Oecologia, 2013, vol. 171, no. 2, p. 557-570

Eriophorum vaginatum is a characteristic species of northern peatlands and a keystone plant for cutover bog restoration. Understanding the factors affecting E. vaginatum seedling establishment (i.e. growth dynamics and allocation) under global change has practical implications for the management of abandoned mined bogs and restoration of their C-sequestration function. We studied...

Université de Neuchâtel

Situation de la vigne sauvage Vitis vinifera ssp. silvestris en Europe = Occurrence ofthe wild vine Vitis vinifera ssp. silvestris m Europe

Arnold, Claire ; Gillet, François ; Gobat, Jean-Michel

In: Vitis, 1998, vol. 37, no. 4, p. 159-170

Cette contribution dresse un bilan de la répartition actuelle de la vigne sauvage européenne - Vitis vinifera L. ssp. silvestris (Gmelin) Hegi - sur la base d'une revue bibliographique et d'observations originales effectuées lors de recherches sur son écologie dans les forêts alluviales et colluviales d'Europe. La situation de la vigne sauvage s'avère préoccupante dans la...

Université de Neuchâtel

Structure of microbial communities in Sphagnum peatlands and effect of atmospheric carbon dioxide enrichment

Mitchell, Edward A. D. ; Gilbert, Daniel ; Buttler, Alexandre ; Amblard, Christian ; Grosvernier, Philippe ; Gobat, Jean-Michel

In: Microbial Ecology, 2003, vol. 46, no. 2, p. 187-199

Little is known about the structure of microbial communities in Sphagnum peatlands, and the potential effects of the increasing atmospheric C02 concentration on these communities are not known. We analyzed the structure of microbial communities in five Sphagnum-dominated peatlands across Europe and their response to C02 enrichment using miniFACE systems. After...

Université de Neuchâtel

Horizontal Distribution Patterns of Testate Amoebae (Protozoa) in a Sphagnum magellanicum Carpet

Mitchell, Edward A. D. ; Borcard, Daniel ; Buttler, Alexandre J. ; Grosvernier, Philippe ; Gilbert, Daniel ; Gobat, Jean-Michel

In: Microbial Ecology, 2000, vol. 39, no. 4, p. 290-300

The distribution of soil microorganisms is generally believed to be patchy and to reflect habitat heterogeneity. Despite this general rule, the amount of existing data on species distribution patterns is scarce. Testate amoebae (Protozoa; Rhizopoda) are an important component of soil microbial communities and are increasingly used in ecological and paleoecological studies of...