Lopez B.C., Potrony D., López A., Badosa E., Bonada A., Saló R. (2010) Nest-box use by Boreal Owls (Aegolius funereus) in the Pyrenees Mountains in Spain. Journal of Raptor Research. 44: 40-49.EnllaçDoi: 10.3356/JRR-09-32.1
The Boreal Owl (Aegolius funereus) is a nocturnal forest-dwelling species widely distributed throughout the world. One of the least studied and most southerly populations of this species lives in the Pyrenees Mountains. This population, 500600 pairs, probably suffered a slight decline during recent decades due to forestry management practices. The use of nest boxes may become necessary to protect this species in southern Europe. The objective of this study was to establish a standard protocol for nest-box installation, based on the analysis of occupation rates of nest boxes installed during the last 20 yr and the comparison of reproductive data for nest boxes and natural nest cavities. Our results indicated that nest boxes should be installed at high elevations (above 2000 m asl), below 4 m aboveground, and preferably facing south or southeast. We also found that most territories are located where maximum July temperatures are
López B.C., Pino J., López A. (2010) Explaining the successful introduction of the alpine marmot in the Pyrenees. Biological Invasions. 12: 3205-3217.EnllaçDoi: 10.1007/s10530-010-9712-0
Alpine marmots were introduced into the northern Pyrenees between 1948 and 1988 from individuals captured in the French Alps, in order to bolster food sources for the golden eagle and brown bear. The marmot's subsequent occupation of the southern Pyrenees has been extremely fast. From an initial population of ~400 individuals, the present population in the southern Pyrenees is estimated to be of more than 10,000 individuals. The objective of this study was to assess what were the mechanisms that have enabled such a fast occupation of the territory. We studied habitat preferences and habitat selection of the alpine marmot in the southern Pyrenees both at the micro- and meso-scale, and compared our results with similar data in the bibliography on their native region. We also compared climatic data from both the native and introduction sites. Our results indicate relatively low climate (precipitation and temperature) matching between the two sites but a relatively high habitat matching. Marmots negatively select high woody cover and the presence of conifers in their home range, while they choose alpine and sub-alpine meadows close to rivers with boulders. Furthermore, the marmot population is independent of snow cover duration. We conclude that the successful establishment in the Pyrenees by the alpine marmot is explained both by the habitat- and climate-matching mechanisms. In both aspects, marmots show a generalist response. Meso-scale GIS-derived variables were non significant when analyzed together with local, micro-scale variables from field measurements. © 2010 Springer Science+Business Media B.V.
López BC, Subiranas J (2009) A la recerca de les marmotes. Cavall Fort 1131: 20-23.
López BC (2009) Prediccions meteorològiques per preservar espècies vegetals. UAB Divulga
Martínez-Vilalta J, Claramunt B, Arnan X, Estorach M, Poyatos R (2009) L’edat de les oliveres monumentals i singulars del Montsià. Raïls 25: 208-221.
Figueroa I., López B.C., López A., Potrony D. (2009) What happens to ptarmigan when marmots arrive?. Ethology Ecology and Evolution. 21: 251-260.EnllaçDoi: 10.1080/08927014.2009.9522480
Rock ptarmigan is a vulnerable species in the southern Pyrenees, with less than 300 pairs and two unconnected populations. Alpine marmot was introduced in the northern Pyrenees between 1955 and 1988, but they rapidly colonised the southern slopes, with an actual estimated population of around 10,000 individuals. Both species are mainly herbivores, develop their activities on the ground and have their offspring at the same time, so they may compete at various levels. We studied the possible interactions between the two species based on fleld observations, bibliographic data and Geographical Information System (GIS) analysis. We found that alpine marmot has colonised all habitats occupied by rock ptarmigan in the southern Pyrenees, but their plant diet is absolutely differentiated. We also analysed the composition of golden eagle nests and conflrmed that this predator predates the two species. From fleld observations in areas where the two species have coexisted for more than 10 years, we observed no behavioural interaction between the two species. So, although both species share space and time in the alpine communities, both diet differentiation and probably behavioural avoidance permits their coexistence.
López B.C., Figueroa I., Pino J., López A., Potrony D. (2009) Potential distribution of the alpine marmot in Southern Pyrenees. Ethology Ecology and Evolution. 21: 225-235.EnllaçDoi: 10.1080/08927014.2009.9522477
Alpine marmots were introduced in the French Pyrenees between 1948 and 1988. The exact number of re-introduced individuals is unknown, but it oscillated around 400. The likely preference of marmots for the southern sunny slopes rapidly facilitated their expansion to the southern Pyrenees, where the lack of both natural predators and of important interspeciflc competitors also likely facilitated an important expansion of this species. There is only one attempt to broadly calculate the population of marmots in the southern Pyrennes, estimating a population of around 10,000 individuals. However, there exist no reliable data to calculate the potential distribution of this new colonizing species in the southern Pyrenees, and a map of the potential distribution of the species is necessary to see whether alpine marmots can potentially establish in sites where it might be necessary to manage its populations for various reasons. We developed a map of potential distribution based on census carried out in summer of 2007 in an area of more than 600 km. We censused more around 300 colonies together with around 300 random points to characterized habitat selection variables. A map with a pixel size of 15 × 15 m has been obtained based on preferred habitats and also on distances to other habitats for the whole southeastern Pyrenees.
López B.C., Gracia C.A., Sabaté S., Keenan T. (2009) Assessing the resilience of Mediterranean holm oaks to disturbances using selective thinning. Acta Oecologica. 35: 849-854.EnllaçDoi: 10.1016/j.actao.2009.09.001
Climate change will increase the frequency and the intensity of droughts in the Mediterranean region, likely reducing growth and increasing mortality of holm oaks (Quercus ilex), one of the most abundant species of Mediterranean forests. In water-limited systems such as those of the Mediterranean, carbon allocation patterns strongly favour belowground accumulation, especially in large subterranean structures called lignotubers. The resilience of these forests depends largely on the replenishment rate of these carbon reserves after disturbances. An experimental thinning, with two intensities (removal of 40% and 80% of basal area), was performed in 1992 in a holm oak forest at the Prades Experimental Complex of Catchments (NE Spain). In 2002, a second thinning was carried out in subplots within the former experimental 0.5 ha plots. Samples from the lignotubers of holm oak trees were analyzed for starch, and both mobile and immobile chemical components, in order to assess the resilience of holm oaks to repeated disturbances. Our results show that after 10 years, starch stocks in the lignotubers have only recovered to half their former values. Removing 40% of the basal area instead of 80% is suggested to be the better managing option for this kind of forests. © 2009 Elsevier Masson SAS. All rights reserved.
Sabaté S, Espelta JM,Gracia C, Claramunt B, Cotillas de la Torre M, Keenan T, Sánchez Humanes B, Vayreda J, Plà E (2009) Impactos del cambio climático sobre los bosques mediterráneos analizados en el marco de distintos proyectos de investigación. V Congreso Forestal Español. Montes y Sociedad: Saber que hacer. S.E.C.F-Junta de Castilla y León. ISBN: 978-84-936854-6-1.
Claramunt B (2008) Assessor científic de l'article “Regreso al futuro” National Geographic vol. 23 núm. 6.
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