Study of planktonic crustaceans (Cladocera and Copepeda)‎ community in the Hilla Rive Iraq

Joint Authors

al-Kuraywi, Husayn Ulaywi Hasan
al-Khalidi, Sad Kazim Ali Allah
Ahmud, Qasim Ammar

Source

Mesopotamia Environment Journal

Publisher

University of Babylon Environmental Research and Studies Center

Publication Date

2017-12-31

Country of Publication

Iraq

No. of Pages

14

Main Subjects

Natural & Life Sciences (Multidisciplinary)

English Abstract

This study focused on monthly densities of planktonic crustaceans (cladocera and copepeda) in Hilla River, as well as their relationship with some physical and chemical factors at 3 sites for the period from May 2015 to April 2016 .

In present study the water temperature ranged from (12 to 32.6) ºC in summer and winter at sites 1 and 2, respectively ,the pH values were on the alkaline side with ranged from (6.55 to 8.1) in summer and spring at sites 1 and 3 respectively ,the Turbidity range from (2.70 to 31.44) NTU in summer and winter at sites 1 and 2 respectively, Electrical conductivity (EC) values changed from (500 to 1810) μS.cm-¹ in winter and summer at sites 1and 2 respectively, the dissolved oxygen(DO)values varied from (4.77 to 11.51) mg / l in summer and autumn at site 2 and 3, respectively , Biochemical Oxygen Demand (BOD5) ranged from (1.5 to 6.1) mg/l in winter and summer at site 1 and 2 respectively, Nitrate changed from(5.71 to120.11) μgm atN-NO3.

L-¹ in summer and winter at site 1 and 2 respectively, Phosphate varied from(0.12 to 9.5 ) μgm atP-PO4.

L-¹ in autumn and winter at site 3 and 2 respectively.

The total crustacean densities showed seasonally and locally significant differences between sampling periods, with higher densities 2050 Ind / m3 in spring at site 1 while lowest densities150 Ind / m3 in the winter at site 2 with recorded a positive significant relationship with water temperature (r= 0.66, p<0.05) and negative significant relationship with each of the BOD, Turbidity, Nitrate and Phosphate (r=- 0.55,r= - 0.58, r= - 0.64, r= - 0.62,P<0.05) respectively.

In present study 25 taxa of crustacean were identified and distributed between 16 taxa belong to cladocera and 9 taxa to copepada ,the highest number of Cladoceran 1900 Ind / m3 in spring at site 1 and the lowest number 100 Ind/m3 in winter season at site 2 with recorded a positive significant relationship only with pH (r= 0.66, p<0.05) and negative correlation with each of the Turbidity, Nitrate and phosphate.

(r = 0.61, r = - 0.59, r = - 0.63, p<0.05).

respectively, the Chydorus sphaericus was the most abundant cladocera species and its peak was observed in spring.

The highest number of copepod 850 Ind/m3 was recorded in summer at site 3 and the lowest number 100 Ind / m3 in winter at site 2, with a positive significant relationship with water temperature, BOD and EC (r = 0.65, r =0.66, r = 0.64, p<0.05) respectively while recorded negative significant with DO ( r= - 0.63,P<0.05) the Nauplii was found as the most abundant copepoda taxa and its peak was observed in summer season.

Data Type

Conference Papers

Record ID

BIM-787029

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