Effect of some environmental factors on the density of odonata naiads in the temporary ponds of Basrah province, south of Iraq

Abstract EN

The environmental effects of some factors (temperature, salinity, pH and dissolve oxygen) were studied to determine the monthly changes on the density of Odonata naiads in three temporary ponds: St.

1-Abu Gosra, St.

2- Al-Masehab and St.

3-Al-Jilal, in Basrah Province, South of Iraq, during the period from December 2017 to November 2018.

The results show that the total density of naiads was significantly positive correlation (p<0.

01) with temperature and salinity, whereas it significantly negative correlation (p<0.

01) with pH and dissolve oxygen.

The highest density 124 ind.

/ m3 was recorded for Anisoptera in February at St.

2 and 70 ind.

/ m3 for Zygoptera in April at St.

1, while the lowest density was 3 and 2 ind.

/m3 were recorded for Anisoptera and Zygoptera in June at St.

1 respectively.

Temperature recorded a significant (P<0.

05) variation, the air temperature ranged between 14- 46 ° C and the water temperature ranged between 12-38° C.

The highest value of salinity reached 14 g / L in October at St.

2, while the lowest values reached 1.

2 g / l during November at St.

3, pH values were ranged between 4.

5 -8.

2 in July at St.

1 and in October at St.

3 respectively, and the values of dissolved oxygen were ranged between 0.

8- 10 mg / l in July at St.

1 and January at St.

3 respectively.