Biodiversité acridienne des zones humides et des écosystèmes forestiers (de [i]Quercus suber[/i] et de [i]Q. canariensis[/i]) : effets du climat et de la végétation

The abundance, richness and seasonal composition of grasshopper communities (Caelifera) were studied in three natural wetland areas, in northeastern Algeria, near El-Tarf and El-Kala. A census of 19 species showed that 12 species were recorded at the station of Chtaïba (Quercus suber forest around 350 m A.S.L.), 11 in the marsh of Mekhada (around 30 m), and 10 in the station of El-Ghorra (Quercus canariensis forest, around 875 m). The different species were grouped into three assemblages, according to class frequency, and their temporal succession depended on the minima of monthly temperature, except at the El-Ghorra station. The assemblages corresponding to each station showed similar species richness and diversity, although their composition was quite different.[br/]The marsh station of Mekhada is characterized by littoral species, such as Eyprepocnemis plorans, Euchorthippus albolineatus, Tropidopola cylindrica and Platypygius platypygius. Together with Chorthippus vagans africanus, P. platypygius seem to be the most remarkable species of the region. There is an important lag in the abundance of adults at both forest stations compared to the littoral station. The richness of grasshopper assemblages was found to depend on the diversity of Poaceae