Terrestrial gastropod diversity, distribution and abundance in areas with and without anthropogenic disturbances, Northeast Algeria

Abstract

Belhiouani H, El-Hadef El-Okki M, Afri-Mehennaoui FZ, Sahli L. 2019. Terrestrial gastropod diversity, distribution and abundance in areas with and without anthropogenic disturbances. Biodiversitas 20: 243-249. The objective of this study was to establish an inventory of terrestrial gastropods from different sites in the northeast of Algeria. Several points were sampled from five various areas relatively affected by human activity. Areas prospected were an industrial area (El-Hadjar, Annaba), a mining area (Djebel Hamimat, Oum-El-Bouaghi), an urban area (B’kira, Constantine), a mountainous area (Ibn Ziad, Constantine) and a sub-mountainous area (Ibn Badis, Constantine). A total of 11 species and 2632 individual land snails belonging to six molluscan families (Helicidae, Hygromiidae, Sphincterochilidae, Achatinidae, Enidae, and Pomatiidae) and 10 genera were found in all habitats. The highest density was recorded in the mountainous area with 1270 individuals and 10 species, whereas the lowest value was recorded in the mining and the industrial areas with 3 and 4 species respectively. The malacofaunal diversity was also determined, Shannon’s index, Simpson’s index, and equitability index are higher in the mountainous zone of Ibn Ziad with 1.87, 0.82 and 0.78 respectively, and lower in the mining area of Djebel Hamimat, with 0.60, 0.33, and 0.54. The dispersion and density of species appear to be contingent upon several factors among which soil properties, height, climate conditions and certainly anthropogenic disturbance.

Diversity and abundance of terrestrial gastropods in Skikda region (North-East Algeria): correlation with soil physicochemical factors

“…Several studies on land snail inventories have been carried out in several biotopes of Algeria, notably in the north-western (Damerdji, 2008(Damerdji, , 2013 and north-eastern regions (Larbaa & Soltani, 2013;Douafer & Soltani, 2014). Recently, a survey of gastropods was conducted in five areas of north-eastern Algeria (Belhiouani et al, 2019). However, we are not aware of a study on the biodiversity and abundance of terrestrial gastropods in other areas of northeast Algeria.…”

Species composition, relative abundance, and distribution of land snail species in Mt. Lantoy Key Biodiversity Area, Cebu, Philippines

“…Disturbances in the forest habitat have an adverse effect on the distribution and abundance of land snails being highly sensitive to climatic and other environmental changes (Bloch 2012). Belhiouani et al (2018) showed that areas with less to no anthropogenic disturbances in Northeast Algeria recorded high land snail abundance and diversity with ten species than to areas with anthropogenic disturbances that obtained only four species. Bloch (2012) suggested that regular cyclic disturbances such as typhoons or extreme dry season can cause a decline in land snail abundance but can recover over five or ten years.…”

Keanekaragaman Jenis Keong Darat Di Kawasan Taman Wisata Alam Telaga Warna, Bogor, Jawa Barat

“…Keanekaragaman jenis keong darat dapat dilihat kelimpahan jenis paling banyak ditemui pada malam hari, di lokasi hutan primer dan sekunder. Faktor yang mempengaruhi keanekaragaman adalah habitat, suhu dan kelembaban (Belhiouani, El-Okki, M.E., Afri-Mehennaoui, & Sahli, 2019). Tumpukan daun di atas serasah dapat membentuk lapisan penahan suhu malam dengan siang di luar serasah tidak mempengaruhi suhu di dalam serasah (Villeneuve, Thornhill, & Eales, 2019).…”