Effects of environmental parameters on the nycthemeral migratory behaviour of copepod species in the Al Massira reservoir, Morocco
1 Laboratory of Physiology and Ecotoxicology, Department of Biology, Faculty of Sciences Chouaïb Doukkali University, 2400, BP 20, Route Ben Maachou, El Jadida, Morocco.
2 Laboratories of Environmental Study and Analysis, Department of Biology, Faculty of Sciences Chouaïb Doukkali University, 2400, BP 20, Route Ben Maachou, El Jadida, Morocco.
Research Article
GSC Biological and Pharmaceutical Sciences, 2020, 13(03), 162-173.
Article DOI: 10.30574/gscbps.2020.13.3.381
Publication history:
Received on 23 November 2020; revised on 12 December 2020; accepted on 15 December 2020
Abstract:
To improve our knowledge of nocturnal and diurnal migratory activity in copepods and in order to assess the effect of abiotic parameters on this activity, we have undertaken at the level of the Al Massira dam reservoir (dam located on the wadi Oum Erbia, in Morocco) the monitoring of the migration of the main species, during a 24-hour nycthemeral cycle. To be done; the measurement and sampling step is carried out every 4 hours; at different depths of the prospected station. The temperature, pH, dissolved oxygen and chlorophyll a measurements are taken. The systematic position of the main species of copepods and their density are determined.
Most of the results obtained show that the main species of copepods inventoried within the reservoir are Neolovenula alluaudi and Acanthocyclops robustus. The nauplii of these two species present the maximum of densities at a depth of -5 m at 12 h; i.e. 70400 individual / m3 (ind / m3). The development stages of N. alluaudi are preferentially concentrated at -2 m at midnight, with 1900 ind / m3, while at 12 h and 16 h this density is less than 500 ind / m3. The maximum density for the stages of A. robustus is noted at midnight on the surface (at -5 m), i.e. 3400 ind / m3 for C1-2 and 3200 ind / m3 for stages C3-4-5 at -2 m at the same time. Therefore, the migratory behavior of these species seems to depend on the temperature, the concentration of dissolved oxygen and the variation of the food during the different phases of the cycle.
Keywords:
Nycthemeral migration; Copepods; Dam; Abiotic parameters
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