Oficina Tecnica de Parcs Naturals

Barcelona, Spain

Oficina Tecnica de Parcs Naturals

Barcelona, Spain
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Bros V.,Oficina Tecnica de Parcs Naturals | Torre I.,Museu de Granollers Ciencies Naturals | Santos X.,University of Porto
Ecological Research | Year: 2015

Land snails are an important component of biodiversity but the information regarding the factors that influence their distribution is very incomplete or anecdotal in most geographic areas. In this article our aim was to uncover environmental factors that influence the distribution and diversity of a Gastropoda community in a Mediterranean Reserve (Collserola Natural Park, Barcelona). Fieldwork was conducted from 2001 to 2003, andwe systematically sampled all 1 km2 UTM squares throughout the park by randomly selecting at least one 200 m2 plot within each square. We used a community-based approach to analyse the relationships between 61 Gastropod species distributions and environmental predictors by means of Redundancy Analysis (RDA). Our results highlighted that the land snail community was affected by the environmental predictors (even for short gradients), but their influence was low according to the explained variance (30 %). Climate and habitat predictors were more important than the spatial variables in determining the community composition and diversity. 48 out of 61 (78.7 %) land snail species showed significant responses to the environmental gradients with an association of specialist species with particular habitat types. Collserola is a reserve surrounded by urbanised areas and affected by multiple anthropogenic threats mostly related to habitat transformation. The high degree of specialisation within the Gastropoda community suggests that the restoration of heterogeneous landscapes would be useful to conserve and restore terrestrial mollusc diversity in Collserola. This study can help stakeholders to make decisions related to landscape planning and habitat transformation. © 2015 The Ecological Society of Japan

Reyes-Garcia V.,Autonomous University of Barcelona | Ledezma J.C.,Conservation International Bolivia | Paneque-Galvez J.,Autonomous University of Barcelona | Orta M.,Autonomous University of Barcelona | And 4 more authors.
Society and Natural Resources | Year: 2012

Integration into the market economy changes indigenous people's use of land and resources. We study one pathway leading to integration of indigenous peoples to the market economy: the entrance of nonindigenous peoples into lands inhabited by indigenous populations. We analyzed data from a survey (n = 779) in 87 Tsimane' villages, an Amazonian society. We assessed the entrance of traders, loggers, cattle ranchers, highland colonist farmers, and other nonindigenous peoples in villages settled in parks, forest concessions, indigenous territories, and private lands. Interactions were generally frequent, friendly, and had an economic basis. The Tsimane' expressed hostility to the entrance of highland colonist farmers. The entrance of nonindigenous peoples was associated with unregulated natural resource extraction. If conservationists want to gain the allegiance of Tsimane' on conservation efforts, they will have to present them with a better alternative than the current economic benefits generated by the presence of nonindigenous peoples on their lands. © 2012 Taylor & Francis Group, LLC.

Casas-Diaz E.,Autonomous University of Barcelona | Closa-Sebastia F.,Autonomous University of Barcelona | Peris A.,Oficina Tecnica de Parcs Naturals | Mino A.,Oficina Tecnica de Parcs Naturals | And 7 more authors.
Wildlife Biology in Practice | Year: 2013

The wild boar population in Spain has increased in recent decades due to a number of factors, including increased food availability, the abandonment of crops, as well as through hybridization with the domestic pig. Studying dispersal is useful for understanding the ecology of a species and the spread of diseases in wildlife. In the case of the wild boar (Sus scrofa), its dispersal depends on environmental changes, food availability, population density, and hunting pressure. The goal of this study was to describe the dispersal of wild boars captured with cage-traps, anesthetized and marked with ear tags between 2008 and 2012 in Catalonia (northeast Spain). Six of 40 wild boars (16 males and 24 females) were recaptured at a mean linear distance of 45.8 km (min. 30, max. 89.8) from their origin. Surprisingly, females dispersed more than males, 57.7 km on average, a distance 1.7 times greater than females in other parts of the world. These dispersal patterns can be partially explained by the need for new territories. This mammal has experienced a huge increase in both distribution range and status throughout the Iberian Peninsula, probably due to an increase in vegetation cover and a lack of predators. Hence, any information about its dispersal patterns is of special interest to specific management plans. Despite to our moderate sample size, it is clear that the impressive dispersal ability of wild boar should be taken into account in the design of health surveillance programs of wildlife diseases.© 2013 E. Casas-Díaz, F. Closa-Sebastià, A. Peris, A. Miño, J. Torrentó, R. Casanovas, I. Marco, S. Lavín, P. Fernández-Llario & E. Serrano.

Torre I.,Museu de Ciencies Naturals de Granollers | Bros V.,Oficina Tecnica de Parcs Naturals | Santos X.,University of Porto
Biodiversity and Conservation | Year: 2014

In the Mediterranean basin, pine tree reforestation has been the most common management tool in restoring degraded and burnt areas, as well as for economic purposes. However, the quality of the biodiversity of these habitats has undergone little assessment. Terrestrial gastropods are suitable indicators of forest quality and long-term stability because of their strict dependence on microhabitat conditions and their slow dispersal rate. We sampled the gastropod population in a protected Mediterranean area in order to compare the species richness in seven main habitats. Holm oak wood and mixed-pine forests were the habitats with the lowest species density, and areas with a high level of heterogeneity exhibited the richest communities. In recent decades however, land abandonment and pine reforestation are leading to landscape homogeneity, which is perhaps the cause of the extinction of six open-habitat gastropod species in the Park. These results provide park authorities with insights into how to adapt management plans to enhance habitat quality for land snail and slug assemblages. More specifically, our results stress the need to create habitat heterogeneity to increase land mollusc diversity in large and continuous areas of mixed-pine forests. © 2014 Springer Science+Business Media Dordrecht.

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