Large-scale determinants of diversity across Spanish forest habitats: accounting for model uncertainty in compositional and structural indicators
Martin Queller, Emilia Maria
Alberdi Asensi, Iciar
Saura Martínez de Toda, Santiago
MetadataShow full item record
An integral understanding of forest biodiversity requires the exploration of the many aspects it comprises and of the numerous potential determinants of their distribution. The landscape ecological approach provides a necessary complement to conventional local studies that focus on individual plots
or forest ownerships. However, most previous landscape studies used equally-sized cells as units of analysis to identify the factors affecting forest biodiversity distribution. Stratification of the analysis by habitats with a relatively homogeneous forest composition might be more adequate to capture the underlying patterns associated to the formation and development of a particular ensemble of interacting forest species. Here we used a landscape perspective in order to improve our understanding on the influence of large-scale explanatory factors on forest biodiversity indicators in Spanish habitats, covering a wide latitudinal and altitudinal range. We considered six forest biodiversity indicators estimated from more than 30,000 field plots in the Spanish national forest inventory, distributed in 213 forest habitats over 16 Spanish provinces. We explored biodiversity response to various environmental (climate and topography) and landscape configuration (fragmentation and shape complexity) variables through multiple linear regression models (built and assessed through the Akaike Information Criterion). In particular, we took into account the inherent model uncertainty when dealing with a complex and large set of variables, and considered different plausible models and their probability of being the best candidate for the observed data. Our results showed that compositional indicators (species richness and diversity) were mostly explained by environmental factors. Models for structural indicators (standing deadwood and stand complexity) had the worst fits and selection uncertainties, but did show significant associations with some configuration metrics. In general, biodiversity increased in habitats covering wider topographic ranges and comprising forest patches with more complex shapes. Patterns in other relationships varied between indicators (e.g. species richness vs. diversity), or even were opposed (trees vs. shrubs). Our study (1) allowed deepening the understanding of biodiversity patterns in a large set of Spanish forest habitats and (2) highlighted the increasing complexity of identifying common landscape conditions favouring forest biodiversity as the range of analysed biodiversity aspects is widened beyond the more commonly assessed species richness indicators.
Is part ofForest Systems, 2011, vol. 20, núm. 1, p. 151-164
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
Relating landscape structure, environment and management to biodiversity indicators estimated from forest inventory data in Catalonia (NE Spain) Martin Queller, Emilia Maria; Torras, O.; Saura Martínez de Toda, Santiago (Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), 2009)There is an increasing need to develop efficient methods for characterising and monitoring forest biodiversity. A landscape scale approach and assessment can provide complementary and valuable information in this respect, ...
A broad-scale analysis of the main factors determining the current structure and understory composition of Catalonian sub-alpine (Pinus uncinata Ram.) forests Martín Alcón, Santiago; Coll Mir, Lluís; Aunós Gómez, Álvaro (Oxford University Press, 2011-12-13)A broad-scale analysis of the structure and understory composition of Pyrenean mountain pine (Pinus uncinata Ram.) stands was performed using data from the Spanish National Forest Inventory. Twelve structure-based forest ...
Gil Tena, Assumpció; Vega García, Cristina; Brotons, Lluís; Saura Martínez de Toda, Santiago (Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (Espanya), 2010)Para preservar la biodiversidad de los ecosistemas forestales de la Europa mediterránea en escenarios actuales y futuros de cambio global mediante una gestión forestal sostenible es necesario determinar cómo influye el ...