Diversity of the Malacofauna on Two Species of Cistaceae (Cistus Salvifolius L. and C. Monspeliensis L.) in the Tlemcen Region (Northwestern Algeria)

Abstract

The region of Tlemcen is located in the northwest of Algeria, whose climatic impact is reflected in the degradation of the forest in the scrub, open formation made up of xerophytic plants such as Cistus ... We propose to carry out an approach of the diversity of the malacofauna found on 2 species of Cistaceae namely Cistus salvifolius and C.monspeliensis. The malacological richness is estimated at 11 species on the Cistus with sage leaves and 13 on the Cistus of Montpellier. These are divided into 4 families: Milacidae, Sphincherochilidae, Helicidae and Subulinidae. The 1st, 2nd and 4th families have one species each. These are Milax gagates, Sphincterochila candidissima and Rumina decollata, respectively. Concerning the family of Helicidae, the most diversified includes 2 subfamilies: those of Helicinae and Helicellinae. The 1st subfamily has 8 species on the cistus of Montpellier and 7 species on the cistus with sage leaves. The 2nd subfamily includes 4 species on Cistus monspeliensis and only 2 species on the other Cistaceae. The seasonal distribution according to the specific richness of the Gastropods is shown. We are looking for the malacological species specific to each of the two Cistaceae species and the species which are common to them. Finally, the vertical distribution of gastropods is given