Affiner les résultats

Langue

Université de Neuchâtel

Subordinate plant species moderate drought effects on earthworm communities in grasslands

Mariotte, Pierre ; Le Bayon, Renée Claire ; Eisenhauer, Nico ; Guenat, Claire ; Buttler, Alexandre

In: Soil Biology & Biochemistry, 2016, vol. 96, p. 119-126

Loss of plant diversity resulting from forecasted drought events is likely to alter soil functioning and affect earthworm communities. Plant-soil interactions are expected to play an important role in mediating climate change effects on soil decomposers. In this study, we test above-belowground linkages after drought by focusing on the effects of subordinate plant species on earthworm...

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

Etude écosystémique des marais non boisés de la rive sud du lac de Neuchâtel (Suisse) : phytosociologie, pédologie, hydrodynamique et hydrochimie, production végétale, cycles biogéochimiques et influence du fauchage sur la végétation

Buttler, Alexandre ; Gobat, Jean-Michel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 1987.

Cette étude écosystémique a été entreprise pour améliorer la connaissance écologique des marais récents créés sur la rive sud du lac de Neuchâtel par la Correction des eaux du Jura. La recherche envisagée devait déboucher sur des arguments susceptibles d'orienter l'activité des organismes chargés de la gestion des zones humides de Suisse, tout en donnant une base de travail à des...

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

Above- and belowground linkages in Sphagnum peatland : climate warming affects plant-microbial interactions

Jassey, Vincent E. J. ; Chiapusio, Geneviève ; Binet, Philippe ; Buttler, Alexandre ; Laggoun-Défarge, Fatima ; Delarue, Frédéric ; Bernard, Nadine ; Mitchell, Edward A. D. ; Toussaint, Marie-Laure ; Francez, André-Jean ; Gilbert, Daniel

In: Global Change Biology, 2013, vol. 19, no. 3, p. 811-823

Peatlands contain approximately one third of all soil organic carbon (SOC). Warming can alter above- and belowground linkages that regulate soil organic carbon dynamics and C-balance in peatlands. Here we examine the multiyear impact of in situ experimental warming on the microbial food web, vegetation, and their feedbacks with soil chemistry. We provide evidence of both positive and...

Université de Neuchâtel

Seasonal Net Ecosystem Carbon Exchange of a Regenerating Cutaway Bog: How Long Does it Take to Restore the C-Sequestration Function?

Samaritani, Emanuela ; Siegenthaler, Andy ; Yli-Petays, Mika ; Buttler, Alexandre ; Christin, Pascal-Antoine ; Mitchell, Edward A. D.

In: Restoration Ecology, 2011, vol. 19, no. 4, p. 440-449

We measured the net ecosystem exchange (NEE) and respiration rates and modeled the photosynthesis and respiration dynamics in a cutover bog in the Swiss Jura Mountains during one growing season at three stages of regeneration (29, 42, and 51 years after peat cutting; coded sites A, B, and C) to determine if reestablishment of Sphagnum suffices to restore the C-sequestration function. From...

Université de Fribourg

Polyploidy and invasion success: trait trade-offs in native and introduced cytotypes of two Asteraceae species

Thébault, Aurélie ; Gillet, François ; Müller-Schärer, Heinz ; Buttler, Alexandre

In: Plant Ecology, 2010, vol. 212, no. 2, p. 315-325

Invasion success is favoured by the introduction of pre-adapted genotypes. In addition, novel pressures in the introduced range may lead to phenotypic changes related to fitness or competitive ability of introduced plants. Polyploidy appears to be over-represented in invasive plants, but differences between cytotypes in growth strategies including trade-offs among plant traits have received...