Spatial patterns of land use changes across a mediterranean metropolitan landscape: Implications for biodiversity management

Basnou C., Alvarez E., Bagaria G., Guardiola M., Isern R., Vicente P., Pino J. (2013) Spatial patterns of land use changes across a mediterranean metropolitan landscape: Implications for biodiversity management. Environmental Management. 52: 971-980.
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Doi: 10.1007/s00267-013-0150-5

Resum:

Land use and land cover change (LUCC) is an acknowledged cause of the current biodiversity crisis, but the link between LUCC and biodiversity conservation remains largely unknown at the regional scale, especially due to the traditional lack of consistent biodiversity data. We provide a methodological approach for assessing this link through defining a set of major pressures on biodiversity from LUCC and evaluating their extent, distribution, and association with a set of physical factors. The study was performed in the Metropolitan Region of Barcelona (MRB, NE of Spain) between 1956 and 2000. We generated a LUCC map for the time period, which was reclassified into a set of pressures on biodiversity (forestation, deforestation, crop abandonment, and urbanization). We then explored the association of these pressures with a set of physical factors using redundancy analysis (RDA). Pressures encompassed 38.8 % of the MRB area. Urbanization and forestation were the dominating pressures, followed by crop abandonment and deforestation. RDA showed a significant distribution gradient of these pressures in relation to the studied physical factors: while forestation and deforestation are concentrated in remote mountain areas, urbanization mainly occurs in lowlands and especially on the coast, and close to previous urban centers and roads. Unchanged areas are concentrated in rainy and relatively remote mountain areas. Results also showed a dramatic loss of open habitats and of the traditional land use gradient, both featuring Mediterranean landscapes and extremely important for their biodiversity conservation. Implications of these results for biodiversity management are finally discussed. © 2013 Springer Science+Business Media New York.

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Patch history and spatial scale modulate local plant extinction and extinction debt in habitat patches

Guardiola M., Pino J., Roda F. (2013) Patch history and spatial scale modulate local plant extinction and extinction debt in habitat patches. Diversity and Distributions. 19: 825-833.
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Doi: 10.1111/ddi.12045

Resum:

Aim: Many species exhibit a time-lag between habitat loss and its extinction, resulting in extinction debt. Although extinction debt is considered a widespread phenomenon, differences in methodological approaches can affect its detection. We aim to contribute to this methodological debate by exploring whether extinction debt is either a phenomenon common to all patches or idiosyncratic to the patch and landscape attributes of a given patch. We also aim to determine whether the scale dependency of species richness might help to explain extinction debt. Location: Southern Catalonia (NE Iberian Peninsula). Methods: We studied the effects of habitat loss on plant species richness (total, specialists and generalists) in stable (habitat loss

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