Comparing Cognition: Comment on Roth and Dicke.

Reader SM, Sol D, Lefebvre L (2005) Comparing Cognition: Comment on Roth and Dicke. Trends in Cognitive Sciences 9: 411

Ecological mechanisms of a resource polymorphism in Zenaida doves of Barbados.

Sol D, Elie M, Marcoux M, Chrostovsky E, Porcher, Lefebvre L (2005) Ecological mechanisms of a resource polymorphism in Zenaida doves of Barbados. Ecology 86: 2397-2407.

Mediterranean ecosystem bird introductions: Patterns of success and failure across convergent climate regions.

Kark S, Sol D (2005) Mediterranean ecosystem bird introductions: Patterns of success and failure across convergent climate regions. Conservation Biology 271: 1519-1527.

Big brains, enhanced cognition and response of birds to novel environments.

Sol D, Duncan RP, Blackburn TM, Cassey P, Lefebvre L (2005) Big brains, enhanced cognition and response of birds to novel environments. Proceedings of the National Academy of Science (USA) 1021: 5460-5465

Historical land-use legacy and Cortaderia selloana invasion in the Mediterranean region

Domènech R., Vilà M., Pino J., Gesti J. (2005) Historical land-use legacy and Cortaderia selloana invasion in the Mediterranean region. Global Change Biology. 11: 1054-1064.
Enllaç
Doi: 10.1111/j.1365-2486.2005.00965.x

Resum:

Two major components of global change: land-use changes and intentional or accidental species introduction are threatening the conservation of native species worldwide. In particular, Mediterranean coastal areas are highly susceptible to the invasion of alien species and they also have experienced major changes in land use such as agricultural abandonment and urbanization. However, there has been little research done which quantitatively links biological invasions and the components of land-use changes (i.e. number, trajectory and direction of the changes). We analysed the current distribution and abundance of Cortaderia selloana (Schultes et Schultes fil.) Asch, et Graebner, an alien ornamental species, in 332 fields in Aiguamolls de l'Empordà (Catalonia, NE Spain) and related the patterns of invasion to spatiotemporal data on land-use changes from 1956 to 2003. Our aim was to determine which land uses had been more susceptible to C. selloana invasion during the last 5 years and to find out which components of land-use changes triggered invasion. We found that 22.30% of the fields are currently invaded. In the last 5 years, fields have triplicated the total density of C. selloana. The presence of C. selloana decreases with the distance from urban areas. Invasion is over-represented in pastures and old-fields, and it has increased with time since abandonment. The presence of C. selloana was also associated to fields that had experienced many changes in land use in the last 46 years. The most heavily invaded fields were those that were pastures in 1956 and are now old fields in 2003. On average, the largest plants are found in agricultural field margins and in fields that had a disturbed land use both in 1956 and in 2003. Furthermore, pastures had the lowest proportion of reproductive plants. Overall, current C. selloana patterns of invasion can be explained by the historical legacy of land-use changes. © 2005 Blackwell Publishing Ltd.

Llegeix més

Integración masiva de imágenes de Teledetección en la gestión de los recursos hídricos de Cataluña.

Pons X, Serra P, Cristóbal J, Pla M, Monterde M (2005) Integración masiva de imágenes de Teledetección en la gestión de los recursos hídricos de Cataluña. 6th Geomatic Week proceedings (ISSN 1699-3489).

El SIG corporativo de la Agencia Catalana del Agua (ACA) como herramienta de soporte a la gestión de los recursos hídricos de Cataluña.

Pla M, Torres M, Pons X, Monterde M, Ramoneda J, Pastor J (2005) El SIG corporativo de la Agencia Catalana del Agua (ACA) como herramienta de soporte a la gestión de los recursos hídricos de Cataluña. 6th Geomatic Week proceedings (ISSN 1699-3489).

Wet and dry African dust episodes over eastern Spain

Escudero M., Castillo S., Querol X., Avila A., Alarcón M., Viana M.M., Alastuey A., Cuevas E., Rodríguez S. (2005) Wet and dry African dust episodes over eastern Spain. Journal of Geophysical Research D: Atmospheres. 110: 1-15.
Enllaç
Doi: 10.1029/2004JD004731

Resum:

The impact of the African dust on levels of atmospheric suspended particulate matter (SPM) and on wet deposition was evaluated in eastern Iberia for the period 1996-2002. An effort was made to compile both the SPM and wet episodes. To this end, the time series of levels of TSP and PM1O in Levantine air quality monitoring stations were evaluated and complemented with the computation of back trajectories, satellite images, and meteorological analysis. Wet deposition frequency was obtained from weekly collected precipitation data at a rural background station in which the African chemical signature was identified (mainly pH and Ca2+ concentrations). A number of African dust episodes (112) were identified (16 episodes per year). In 93 out of the 112 (13 episodes per year) the African dust influence caused high SPM levels. In 49 out of 112 (7 episodes per year), wet deposition was detected, and the chemistry was influenced by dust. There is a clear seasonal trend with higher frequency of dust outbreaks in May-August, with second modes in March and October. Wet events followed a different pattern, with a marked maximum in May. Except for one event, December was devoid of African air mass intrusions. On the basis of seasonal meteorological patterns affecting the Iberian Peninsula, an interpretation of the meteorological scenarios causing African dust transport over Iberia was carried out. Four scenarios were identified with a clear seasonal trend. The impact of the different dust outbreak scenarios on the levels of PM1O recorded at a rural site (Monagrega, Teruel, Spain) in the period 1996-2002 was also evaluated. Copyright 2005 by the American Geophysical Union.

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Differences in biomass partitioning, leaf nitrogen content, and water use efficiency (δ13C) result in similar performance of seedlings of two Mediterranean oaks with contrasting leaf habit

Espelta J.M., Cortés P., Mangirón M., Retana J. (2005) Differences in biomass partitioning, leaf nitrogen content, and water use efficiency (δ13C) result in similar performance of seedlings of two Mediterranean oaks with contrasting leaf habit. Ecoscience. 12: 447-454.
Enllaç
Doi: 10.2980/i1195-6860-12-4-447.1

Resum:

Co-occurrence of winter-deciduous and evergreen oaks is common in some Mediterranean-type climate areas. However, whether these species show an overlap in their regeneration niche is still poorly understood. We explored experimentally the changes in survival, growth, biomass partitioning, leaf nitrogen content, and water use efficiency (δ 13C) in seedlings of a deciduous oak (Quercus cerrioides) and an evergreen oak (Quercus ilex) in response to co-variation in light and water availability. Quercus cerrioides exhibited higher root length, root area, leaf nitrogen content, and less negative δ13C, but lower leafiness than Q. ilex. The interaction between species and light in specific leaf area and root-shoot ratio indicated different mechanisms to overcome water stress in the two oaks, with Q. ilex relying on leaf hardening and Q. cerrioides relying on a high root-shoot ratio. However, the two species showed similar survival and growth in most of the light-water gradient. Ecological inference of these results indicates that seedlings of these species have a similar ability to cope with variations in light and water in spite of their contrasting leaf habit. This similar performance suggests a competition for similar micro-sites during establishment, rather than a partitioning of the regeneration niche.

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Sòl i territori. Informe dels experts. Informe sobre l'evolució de l'estat del medi ambient a Catalunya. Litoral. Biodiversitat. Sòl i Territori.

Rodà F (2005) Sòl i territori. Informe dels experts. Informe sobre l'evolució de l'estat del medi ambient a Catalunya. Litoral. Biodiversitat. Sòl i Territori. Consell Assessor per al Desenvolupament Sostenible, Generalitat de Catalunya, Barcelona, pp. 316-320.

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