Ecological study of two gastropods species Melanoides turbuculata and Melanopsis preaemorsa from Euphrates river - Basrah, Iraq

Biological and taxonomic studies of snails in the waters Iraq's desert have been enhanced through seasonal recording them, it is one means to follow their distribution determine density. Aiming occurrence density two Melanoides tuberculata Melanopsi preaemorsa, stations at Euphrates river-Basrah, Governorate, Al-Madina Al-Qurna. Three replicates within each station were chosen for sample collection these species using quadrate (25 × 25) cm. Many environmental factors including temperature, salinity, pH, dissolved oxygen (DO), organic material sediment measured, 5,330 samples obtained from stations. The highest annual was recorded by snail M. turbuculata with 2,745 1,072 ind/m² respectively, while preaemorsa 912 601 (St.1 2), respectively. densities 480 ind./m2, June 2019 (St. 1) 57 ind./m2 December 2019. And 2) 256 May 0 August - While (Linnaeus, 1758) 128 July January-February, November-December 144 April August-December statistical analysis found significant differences DO, temperatures, This first study region on particular, abundance.