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Densité de nids de Myrmica en tourbière : exemple de la tourbière de Jouvion (Puy-de-Dôme)

Abstract : As part of a study to evaluate the conservation status of Maculinea alcon alcon stations in the Regional natural Park of the Volcanoes of Auvergne, a study was conducted in July 2015 to evaluate the density of host ant nests (Myrmica sp.) on the Jouvion peat bog. The study method consisted of two phases: trapping using 249 baits distributed within grids having 16m² meshes and then a search for anthills within grids where Myrmica sp. had been found in the previous phase. A total of 194 Myrmica nests were detected. The results provide data in terms of nest density for three species: Myrmica rubra, Myrmica ruginodis and Myrmica scabrinodis, with an average of 2.13, 0.65 and 2.08 nests per 100 m2 respectively. These densities seem low in comparison with existing bibliographic data. However, the heterogeneity of inventory and density estimation methods complicates the comparison between studies. Our results indicate that in Jouvion, the overlap between the host plants and the host anthills of Maculinea alcon alcon is low, which could at least partly explain the decline of the species observed on this site since 2011.
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Submitted on : Thursday, October 22, 2020 - 1:59:25 PM
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Luc Belenguier, Marine Kreder², Vincent Lombard, Mathilde Poussin, Christophe Galkovsky. Densité de nids de Myrmica en tourbière : exemple de la tourbière de Jouvion (Puy-de-Dôme). BIOM - Revue scientifique pour la biodiversité du Massif central, Université Clermont Auvergne, 2020, 1 (1), pp.35-48. ⟨10.18145/biom.v1i1.255⟩. ⟨hal-02975128⟩



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