The ecology and phenology of the Dysderidae (Araneae) were investigated in two different sites (Tala-Guilef and Tikjda), located at opposite slopes of the Djurdjura National Park in Algeria. The following questions were investigated: Are there any endemic species in the studied area? Do the slopes' orientation influence the abundance, richness and diversity of these spider communities? Are the activity and the vital cycle of the three most abundant species different in the two different plant physiognomies (cedar forests and alpine grasslands)? The Dysderidae were collected monthly for 2 years using pitfall traps. In total, 1532 specimens were collected: 333 males, 389 females and 381 juveniles in Tala-Guilef and 230 males, 66 females and 133 juveniles in Tikjda. Among the total of 10 species sampled, three species belonging to three genera in Tala-Guilef, 10 species belonging to four genera in Tikdja and four endemic species was recorded. The slope orientation influence the abundance and the species richness. The activity and the vital cycle of the three most abundant species were not different in the cedar forests and alpine grasslands. For these species, no relationship was found between the activity cycle and the vegetation physiognomy.
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