Modelling the spatial location of Dupont´s Lark Chersophilus duponti during the breeding session in the Ablitas Natura Network area (Navarra)

Full article

Published:

Volume 53(1), June 2006. Pages 55-68.

Language:

Spanish

Original title:

Patrón y modelo de distribución especial de la alondra ricotí Chersophilus duponti durante el periodo reproductor en el LIC de Ablitas (Navarra)

Keywords:

Dupont´s lark, Navarra, census mapping, species distribution modelling, GAM, GIS, landscape fragmentation, conservation strategies

Abstract:

Aims: Dupont´s lark is an endangered species due to different pressure factors, mainly linked to changes in the composition and structure of steppe landscapes due to agriculture activities. The multiple aim is (1) to census the population of dupont´s lark in a Natura Network area, (2) to develop spatial models to assess the driving factors of their spatial pattern and take into account the spatial fragmentation of their habitat patches, and (3) to develop a map of the probability presence of dupont´s lark in order to support conservation strategies.
 

Location: Nature Network area in northern Spain (Ebro Basin).
 

Methods: Census mapping using GPS; Generalised Additive Models, GAM, as non-parametric regression tool inserted in a GIS framework.
 

Results and Conclusions: Density is around 0.40 - 0.51 per 10 ha. Dupont´s lark shows a high habitat preference related to sparse steppe areas, flat areas and scarcely fragmented landscapes. Incorrect interpretations of Community Agrarian Policy (CAP) are over-exploiting steppe areas and putting in danger the viability of this species in this area. Modelling approaches to evaluate the spatial pattern of endangered species and GIS tools could support management decisions in Nature Networks areas.