Alliouche, F. & A. Arab. (2018). How a bioindicator (or cosmopolite) copepod vary between reservoirs of different trophic state? A case from Algeria. Revue d'Ecologie la Terre et la Vie. 73(4)559-568. Oct 2018.

350815

10.3406/revec.2018.1958 [view]

Alliouche, F. & A. Arab

2018

73(4)559-568. Oct 2018

Publication

Available for editors  

he effects of physicochemical parameters on the dynamics of Acanthocyclops robustus in four reservoirs (Kedarra, Gargar, Cheurfas II, and Ghrib) located in the western and central regions of Algeria were studied. Water samples were taken seasonally along a year. The densities of A. robustus were not stable during the year ; they depended on variations in the environmental factors such as the transparency of water, orthophosphates, conductivity, BOD5, and nutrients. Statistical tests were used to demonstrate the interactions between the environmental parameters and A. robustus density. There was heterogeneity in the physicochemical parameters measured among the reservoirs. The organic pollution index of the reservoir waters ranged between 2.5 (strong organic pollution) and 3.75 (moderate organic pollution). Acanthocyclops robustus was a perennial species in all four reservoirs. The density of the species varied at a spatiotemporal scale ; the highest levels were observed at Kedarra reservoir (317,542 ind./L) and the lowest density was found at Cheurfas II reservoir (41,692 ind./L). Results showed that the species was very sensitive to eutrophication ; its density was positively correlated with transparency and the organic pollution index, and negatively with conductivity, calcium, suspended matter, NH4, and DBO5. The OPI highlighted the pollution levels of the different reservoirs studied. The study of A. robustus dynamics showed that the species is strongly affected by ecological factors.

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