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Articles 226 registres trobats  inicianterior217 - 226  anar al registre: La cerca s'ha fet en 0.00 segons. 
217.
12 p, 371.7 KB Rapid climate change-related growth decline at the southern range edge of Fagus sylvatica / Jump, Alistair S. (Centre de Recerca Ecològica i Aplicacions Forestals. Unitat d'Ecofisiologia) ; Hunt, Jenny M. (Centre de Recerca Ecològica i Aplicacions Forestals. Unitat d'Ecofisiologia) ; Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Studies on Fagus sylvatica show that growth in populations toward the southern limit of this species' distribution is limited strongly by drought. Warming temperatures in the Mediterranean region are expected to exacerbate drought where they are not accompanied by increases in precipitation. [...]
2006
Global Change Biology, Vol. 12, Núm. 11 ( 2006) , p. 2163-2174  
218.
11 p, 214.6 KB Experimental evidence of reduced diversity of seedlings due to climate modification in a Mediterranean-type community / Lloret Maya, Francisco (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia) ; Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia) ; Estiarte, Marc (Centre de Recerca Ecològica i Aplicacions Forestals. Unitat Ecofisiologia)
We are still lacking in experimental evidence of the effects of climate change on the richness of plant species under field conditions. We report a decrease in the species richness of recruited seedlings in a Mediterranean shrubland in experimentally induced drought and warming over 4 consecutive years. [...]
2004
Global Change Biology, Vol. 10, Núm. 2 (2004) , p. 248-258  
219.
10 p, 956.2 KB A global change-induced biome shift in the Montseny mountains (NE Spain) / Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia) ; Boada, Martí 1949- (Universitat Autònoma de Barcelona. Departament de Geografia)
Shifts in plant species and biome distribution in response to warming have been described in past climate changes. However, reported evidence of such shifts under current climate change is still scarce. [...]
2003
Global Change Biology, Vol. 9, Núm. 2 (2003) , p. 131-140  
220.
14 p, 536.4 KB Changed plant and animal life cycles from 1952 to 2000 in the Mediterranean region / Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia) ; Filella Cubells, Iolanda, dir. (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia) ; Comas, Pere (Cardedeu Field Station)
The available data on climate over the past century indicate that the earth is warming. Important biological effects, including changes of plant and animal life cycle events, have already been reported. [...]
2002
Global Change Biology, Vol. 8, Núm. 6 (2002) , p. 531-544  
221.
8 p, 118.7 KB Carbon-based secondary and structural compounds in Mediterranean shrubs growing near a natural CO2 spring / Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia) ; Castells Caballé, Eva (Centre de Recerca Ecològica i Aplicacions Forestals) ; Joffre, R. (Centre d'Ecologie Fonctionnelle et Evolutive-CNRS. DREAM Unit) ; Tognetti, Roberto (Università degli Studi del Molize. Dipartimento di Scienze Animali, Vegetali e dell'Ambiente)
We studied carbon-based secondary and structural compounds (CBSSCs) in Myrtus communis, Erica arborea, and Juniperus communis co-occurring in a natural CO2 spring site and in a nearby control site in a Mediterranean environment. [...]
2002
Global Change Biology, Vol. 8, Núm. 3 (2002) , p. 281-288  
222.
7 p, 130.6 KB Herbaria century record of increasing eutrophication in Spanish terrestrial ecosystems / Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia) ; Filella Cubells, Iolanda, dir. (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Additional biological evidence is presented for the alteration of biogeochemical cycles by human activities. The leaf δ15N and the concentrations of nutrients in herbarium specimens of 24 species of vascular plants and 3 species of bryophytes collected in northern and eastern regions of Spain have substantially changed throughout the XX century. [...]
2001
Global Change Biology, Vol. 7, Núm. 4 (Abril 2001) , p. 427-433  
223.
11 p, 382.4 KB Leaf mineral concentrations of Erica arborea, Juniperus communis and Myrtus communis growing in the proximity of a natural CO2 spring / Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia) ; Filella Cubells, Iolanda, dir. (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia) ; Tognetti, Roberto (Università degli Studi del Molize. Dipartimento di Scienze Animali, Vegetali e dell'Ambiente (SAVA))
Leaf mineral concentrations of co-occurring Erica arborea, Juniperus communis and Myrtus communis were measured at bimonthly intervals throughout a year in a natural CO2 spring and in a nearby control site with similar soil chemistry in a Mediterranean environment. [...]
2001
Global Change Biology, Vol. 7, Núm. 3 (2001) , p. 291-301  
224.
21 p, 681.5 KB Vers una teoria global de defensa química en plantes : el cas de alcaloides / Castells Caballé, Eva (Centre de Recerca Ecològica i Aplicacions Forestals) ; Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Els alcaloides són un grup de productes del metabolisme secundari altament divers i distribuït majoritàriament en les angiospermes. En les plantes se'ls atribueix com a principal funció la defensa química contra herbívors i patògens. [...]
Alkaloids are a large and very diverse group of secondary metabolites found principally in angiosperms. They play a defensive role in plants against herbivores and pathogens. Alkaloid-bearing plants are usually short life plants and they are localized preferently in tropical regions. [...]

1997
Orsis : Organismes i Sistemes, V. 12 (1997) p. 141-161  
225.
11 p, 394.7 KB Overview on current and past global changes in the Mediterranean ecosystems / Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Atmospheric increases in CO, and other greenhouse gases are the basis of Global Change. The effects on ecosystems are not yet well known. Effects on Mediterranean ecosystems are even less known. Some of the current knowledge on direct and indirect (through climate changes) effects on Mediterranean ecosystems is presented. [...]
Els increments en les concentracions atmosfèriques de CO, i d'altres gasos hivernacle constitueixen la base de l'anomenat canvi global. Els efectes sobre els ecosistemes no són encara ben coneguts, i encara ho són menys els efectes sobre els ecosistemes mediterranis. [...]

1996
Orsis : Organismes i Sistemes, V. 11 (1996) p. 165-175  
226.
45 p, 127.6 KB Excess carbon : the relationship with phenotypical plasticity in storage and defense functions of plants / Estiarte, Marc (Centre de Recerca Ecològica i Aplicacions Forestals) ; Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Photosynthates accumulating in plants in amounts exceeding those needed to saturate growth are considered as excess carbon. Enhancement of carbohydrate excretion by unicellular algae is the simplest phenomenon where excess carbon may be identified. [...]
Es consideren excedents de carboni els fotosintats que s'acumulen als vegetals en quantitats superiors a les necessàries per a saturar el creixement. El fenomen més simple en el qual es poden identificar excedents de carboni és 1'excreció de carbohidrats per algues unicel·lulars. [...]

1999
Orsis : Organismes i Sistemes, N. 14 (1999) , p. 159-203  

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