Holmgren M, López B, Gutiérrez J, Squeo F (2006) Herbivory and plant growth rate determine the success of El Niño Southern Oscillation-driven tree establishment in semiarid South America. Global Change Biology 12: 2263-2271
Pino J, Seguí JM, Alvarez N (2006) Invasibility of four plant communities in the Llobregat delta (Catalonia, NE of Spain) in relation to their historical stability. Hydrobiologia 570: 257-263
Andrés P., Mateos E. (2006) Soil mesofaunal responses to post-mining restoration treatments. Applied Soil Ecology. 33: 67-78.EnllaçDoi: 10.1016/j.apsoil.2005.08.007
As soil destruction is one of the most conspicuous environmental impacts of opencast mining, mining companies are compelled to restore the exploited areas and to develop monitoring programs to test the effectiveness of the restoration treatments. Soil physical and chemical parameters are usually used as soil quality indicators, but bioindicators are more promising as they evaluate the global soil capability to support its ecological functions. In this work, we used soil mesofaunal bioindicators to evaluate four post-mining restoration treatments (soil spreading, soil spreading + grass and herb sowing, soil spreading + tree planting and soil spreading + sowing + planting). Twelve years after restoration none of the treatments had achieved the restoration of the preoperational forest soil conditions. Soil spreading was the least effective treatment. Soil spreading + sowing and soil spreading + sowing + planting generated grassland soil conditions. Soil spreading + planting induced an incipient forest soil structure. Number of taxa, collembolan and oribatid species diversity and communites structure were the most sensitive mesofaunal parameters to evaluate the soil restoration treatments. © 2005 Elsevier B.V. All rights reserved.
Garcia-Orellana J, Sanchez-CabezaJA, Masqué P, Àvila A, Costa E, Loÿe-Pilot MD, Bruach-Menchén JM (2006) Atmospheric fluxes of 210Pb to the Western Mediterranean Sea and the Saharan dust influence. Journal Geophysical Research, Vol. 111, D15305, doi:10.1029/2005JD006660.
Avila A, Alarcón M, García-Orellana J, Masqué P, Castillo S, Escudero M, Querol X (2006) Characteristics of African dust in red rains collected in North-eastern Spain from 1983 to 2002. Geophysical Research Abstracts Vol 8, 04485.
Escudero M, Stein A, Draxler R, Querol X, Alastuey A, Castillo S, Avila A (2006) Determination of the contribution of northern Africa dust source areas to PM10 concentrations over the central Iberian Penninsula using the Hybrid Single-Particle Lagrangian Integrated Trajectory model (HYSPLIT) model. Journal of Geophysical Research 111, DO6210, doi: 10.1029/2005JD006395,2006
Avila A, Terradas J (eds) (2006) Aula d'Ecologia. Cicle de conferències 2005. Servei de Publicacions, Universitat Autònoma de Barcelona. Bellaterra. ISBN: 84-490-2435-8.
Arnan X., Rodrigo A., Retana J. (2006) Post-fire recovery of Mediterranean ground ant communities follows vegetation and dryness gradients. Journal of Biogeography. 33: 1246-1258.EnllaçDoi: 10.1111/j.1365-2699.2006.01506.x
Aim: In the Mediterranean Basin, the main forest communities vary in their ability to recover after fire. In this study we analyse the effects of fire on ant communities occurring in various vegetation types distributed along a geographical gradient in the western Mediterranean region. Location: The study was carried out in burned and unburned habitats of 22 sites corresponding to eight vegetation types distributed along a gradient of dryness throughout Catalonia (north-east Spain). Methods: We placed five pairs of plots (one plot located in the burned area and the second one placed in the unburned margin) per site. We compared ant communities in these unburned and burned plot types 8 years after fire using pitfall traps. Traps were set out in mid-May and mid-July. We analysed the structure and composition of ant communities in the burned and unburned areas of these vegetation types using anova tests, correspondence analysis (CA) and linear regression. Results: The resilience of ant communities varies with vegetation type. Ant communities in forests with high resilience also recover rapidly after fire, while those in forests that do not recover after fire show the lowest resilience. Species richness does not depend on burning or vegetation type. The resilience of these Mediterranean ant communities to fire is related to the environmental characteristics of the region where they live. Accordingly, differences between burned and unburned habitats are smaller for ant communities in areas with higher water deficit in summer than for those in moister ones. Main conclusions: The structure and composition of ant communities after fire depends on the level of direct mortality caused by the fire. It affects ant species differently, as determined by the habitats used for nesting and foraging. The reestablishment of vegetation cover depends on forest composition before the fire. As vegetation cover determines resource and microhabitat availability and competitive relationships among species, forest composition before the fire also affects post-fire recovery of ant communities to the medium-term. Finally, ant communities living in drier areas recover more quickly after fire than those living in moister ones. This pattern might be because in areas with higher water deficit there are more species characteristic of open environments, which are habitats similar to those generated after fire. © 2006 The Authors.
Bosch J., Vicens N. (2006) Relationship between body size, provisioning rate, longevity and reproductive success in females of the solitary bee Osmia cornuta. Behavioral Ecology and Sociobiology. 60: 26-33.EnllaçDoi: 10.1007/s00265-005-0134-4
Body size has often been related to reproductive success in bees and wasps. The objective of this 3-year study was to analyze the relationship between nesting female body size, provisioning rate and longevity and their effect on several traits related to parental investment and reproductive success in the solitary bee Osmia cornuta. Body size was not correlated to longevity, and it was only correlated to provisioning rate in the third year (with poor weather conditions during nesting). Variation in fecundity, offspring size and offspring mortality was not well explained by nesting female body size in any of the 3 years. However, in the third year, small females biased their investment toward males, the sex requiring smaller pollen-nectar provisions. Large females were more successful usurpers of other females' nests, but fecundity of usurpers was no higher than fecundity of nonusurpers. Large females were more likely to establish at the release site, probably in relation to size-dependent vigor at emergence. A review of the literature on parental investment in solitary aculeate Hymenoptera showed a stronger relationship between body size and reproductive success in wasps than in bees. In O. cornuta, fecundity was strongly related to longevity and provisioning rate in all 3 years. Offspring size was associated with provisioning rate in 1 year, when females with higher provisioning rates tended to produce larger sons and daughters. Both longevity and provisioning rate appeared to be strongly conditioned by stochastic events. © Springer-Verlag 2005.
Gracia C (2006) El Bosc de Poblet i el repte del Canvi Climàtic. Actes Segones Jornades sobre el Bosc de Poblet i les Muntanyes de Prades: els limits de la pressió humana en el medi natural. 221-243 pp. ISBN: 84-393-7265-5
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