La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Density and numbers of Tawny Pipit Anthus campestris on a "Causse" grassland area (Southern Massif Central, France) (2017)
Auteurs :	F Lovaty, Auteur
Type de document :	Article
Dans :	Alauda (85(1) janvier 1, 2017)
Article en page(s) :	261-268
Résumé :	During one fortnight in 2016 and one other in 2017, the territorial males of Tawny Pipit were censused along line transects (distance sampling method) across a 4.7km² surface area of grassland and cultivation on the "Causse" de Sauveterre (Lozère, Southern Massif Central). The line transects were separated each from the other by 200m and covered the whole area (totalling a distance of 22.7km). The line-transects were used once in 2016 and two times in 2017. For the two years pooled together, the best models showed a number of 19 to 21 males (for 18.5 expected males) after splitting of distances lesser than 25m. In 2017, the best model showed a number of 19 males (15 to 26 males for a confidence interval at 95%) for 20 males recorded along transects and additional visits. The Tawny Pipit territories were very scattered. The density did not exceed 4 males occurring over 100ha on this still very bare site. A sector of 1,4km² covered with Buxus and Juniperus bushes harboured the same density of birds in 2017. Based on an average density of 4 males/100ha, we assessed the occurrence of about 230 males on this grassland site.

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...