Composition and structure of Gastropoda in the Lavandula dentata L. (Labiatae) stations in the Ghazaouet region (Tlemcen, North-West Algeria)

Abstract

An approach to the diversity of malacofauna associated with toothed lavender was carried out in three stations belonging to the coastal region of Ghazaouet (Wilaya de Tlemcen) from January to July 2013. The specific richness of gastropods is 14 species. Four species are accessories and ten others are accidental. The relative importance of snails varies by station and by month and season. Gastropods preferring certain humidity are easily collected in winter and spring. In April, the species richness is relatively important (6 species) in the 1st and 2nd stations respectively. Milax gagates has a frequency of 78.57% in the first station (Sidi-Aissa) and 57.14% in the 2nd station (Sidi - Amar). Helicella pyramidata has a frequency of 35.71% in station 3 (Bab Khroufa). Similarly, this Helicellinae has a density equal to 0.50 in the same station.

Keywords: Lavandula dentata, terrestrial gastropods, diversity, bioecology, vertical distribution, Ghazaouet region (Tlemcen).

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