تسجيل نوعين من مجدافيات الأرجل Copepoda في سد المشنف في محافظة السويداء (سورية)‎

Abstract EN

Copepoda has a great importance in the environement because of the important place it has in the food chain, and because it determines the nutritional situation of the lakes and filtration of Phytoplankton, deteruratus and bacteria.

Two species were recorded Arctodiaptomus (Rhabdodiaptomus) bacillifer and Neolovenula alluaudi which belong to the order Calanoidae , they were recorded for the first time in Syria in As Sweida governorate (Mshannaf Dam, Ar Roum Dam, and Sahwet Alkhodr Dam).

Water temperature in the Dam during study period ranged (11-24)oC, PH (8.48-9.6) NH+4 concentration (0.2-1.7) mg/liter, PO4'3(1.2-1.87) mg/liter.

A.

Bacillifer appeared in dam water at the beginning of April till the end of June, Nuplius phases for A.

Bacillifer were in April with abundance of 312 individual/ liter, copepod phases in May have reached its maximum abundance 433.3 individual/ liter.

Water temperature during flourishing period in April and June was (15-17) oC.

N.

alluaudi appeared at the beginning of June, nauplius phases flourished in July, had a maximum abundance of (130.5) individual/ liter, copepod phases in August have reached its maximum abundance (120) individual/ liter.

Water temperature in its flourishing period in June and July was (19-21) oC.

A decrease of eggs number and a reduction of individual height corresponding was with temperature rises.