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Université de Neuchâtel

Review: From multi-scale conceptualization to a classification system for inland groundwater-dependent ecosystems

Bertrand, G ; Goldscheider, Nico ; Gobat, Jean-Michel ; Hunkeler, Daniel

In: Hydrogeology journal, 2012, vol. 20, p. 5-25

Aquifers provide water, nutrients and energy with various patterns for many aquatic and terrestrial ecosystems. Groundwater-dependent ecosystems (GDEs) are increasingly recognized for their ecological and socio-economic values. The current knowledge of the processes governing the ecohydrological functioning of inland GDEs is reviewed, in order to assess the key drivers constraining their...

Université de Neuchâtel

Are urban soils similar to natural soils of river valleys?

Amossé, Joël ; Le Bayon, Renée-Claire ; Gobat, Jean-Michel

In: Journal of Soils and Sediments, 2015, vol. 15, no. 8, p. 1716-1724

Purpose Urban soils and soils of river valleys are constituted of heterogeneous materials that have been manipulated, disturbed or transported at different spatial and temporal scales. Despite these similarities, little is known about soil evolution in urban soils and their comparison with natural soils remains therefore highly useful. We hypothesized that, according to their degree of...

Université de Neuchâtel

Effects of endogeic earthworms on the soil organic matter dynamics and the soil structure in urban and alluvial soil materials

Amossé, Joël ; Turberg, Pascal ; Kohler-Milleret, Roxane ; Gobat, Jean-Michel ; Le Bayon, Renée-Claire

In: Geoderma, 2015, vol. 243-244, p. 50-57

Earthworms are considered as key actors of soil processes at different spatial and temporal scales and provide essential ecosystem services linked to climate regulation or primary production. However, little is known about their basic functional roles (e.g. organic matter decomposition, soil structuring processes) in perturbed systems such as urban or alluvial soils. Alluvial soils are...

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...

Université de Neuchâtel

Spatio-temporal pattern of bog pine (Pinus uncinata var. rotundata) at the interface with the Norway spruce (Picea abies) belt on the edge of a raised bog in the Jura Mountains, Switzerland

Freléchoux, François ; Buttler, Alexandre ; Schweingruber, Fritz H. ; Gobat, Jean-Michel

In: Annals of Forest Science, 2004, vol. 61, no. 4, p. 309-318

Réactions spatio-temporelles du pin à crochets (Pinus uncinata var. rotundata) à l'interface d'une ceinture d'épicéas (Picea abies) sur la marge d'un haut-marais de la chaîne jurassienne, Suisse. Dans un site de haut-marais en voie de paludification, un peuplement de pins dépérit, ce qui est actuellement peu fréquent à l'échelle du Jura suisse. Un transect a été établi dans la...

Université de Neuchâtel

Ecological conditions for Saxifraga hirculus in Central Europe: A better understanding for a good protection

Vittoz, Pascal ; Gobat, Jean-Michel ; Wyss, Tania

In: Biological Conservation, 2006, vol. 131, no. 4, p. 594-608

Saxifraga hirculus is a postglacial relict in Central Europe, whose populations suffered a dramatic decrease in the 19th and 20th centuries. However, few researchers have been interested in its ecological requirements in Central Europe. This article synthesizes previous knowledge supplemented by original data from the last large population (Switzerland). S. hirculus is a weak...

Université de Neuchâtel

Soil Microbial Community Changes in Wooded Mountain Pastures due to Simulated Effects of Cattle Grazing

Kohler, Florian ; Hamelin, Jérôme ; Gillet, François ; Gobat, Jean-Michel ; Buttler, Alexandre

In: Plant and Soil, 2005, vol. 278, no. 1-2, p. 327-340

The effect of cattle activity on pastures can be subdivided into three categories of disturbances: herbage removal, dunging and trampling. The objective of this study was to assess separately or in combination the effect of these factors on the potential activities of soil microbial communities and to compare these effects with those of soil properties and plant composition or biomass. Controlled...

Université de Neuchâtel

Effect of cattle activities on gap colonization in mountain pastures

Kohler, Florian ; Gillet, François ; Gobat, Jean-Michel ; Buttler, Alexandre

In: Folia Geobotanica, 2006, vol. 41, no. 3, p. 289-304

Cattle influences gap dynamics in pastures in two ways: (1) by creating gaps and (2) by affecting the colonization process. This effect of cattle activity on gap revegetation can be subdivided in three main factors: herbage removal, trampling and dung and urine deposition. The objective of this study was to assess how these three effects moderate the plant succession following gap creation. ...

Université de Neuchâtel

Spatial and Seasonal Patterns of Cattle Habitat use in a Mountain Wooded Pasture

Kohler, Florian ; Gillet, François ; Reust, Stéphanie ; Wagner, Helene H. ; Gadallah, Fawziah ; Gobat, Jean-Michel ; Buttler, Alexandre

In: Landscape Ecology, 2006, vol. 21, no. 2, p. 281-295

Management-oriented models of cattle habitat use often treat grazing pressure as a single variable summarizing all cattle activities. This paper addresses the following questions: How does the spatial pattern of cattle effects vary between cattle activities in a highly heterogeneous landscape? Do these patterns change over the grazing season as forage availability decreases? What are the...