Evaluation of the trophic status in three reservoirs in Algeria (north west) using physicochemical analysis and rotifers
- PDF / 1,539,592 Bytes
- 16 Pages / 595.276 x 790.866 pts Page_size
- 7 Downloads / 139 Views
SELECTED CASE STUDIES ON THE ENVIRONMENT OF THE MEDITERRANEAN AND SURROUNDING REGIONS
Evaluation of the trophic status in three reservoirs in Algeria (north west) using physicochemical analysis and rotifers structure Ghiles Smaoune 1
&
Djaouida Bouchelouche 1 & Amina Taleb 2 & Abdeslem Arab 1
Received: 31 March 2020 / Accepted: 11 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The aim of this study is to examine the trophic state of three reservoirs located in the northwest of Algeria based on the physicochemistry of water and the community of rotifers. The measurements of the physicochemical variables were carried out monthly over a 2-year period from December 2015 to November 2017. The rotifers were sampled simultaneously. Abiotic and biotic indices such as the Carlson index, QB/T, and TSIROT were determined in order to classify the three reservoirs according to their trophic state. Thus, the diversity indices of Shannon-Wiener (H′), Margalef richness index (D), Pielou evenness (J′), and the density were calculated in order to study the structure of the rotifers. The Kruskal-Wallis test confirmed the heterogeneity of the physicochemical quality (P value < 0.05) among the three reservoirs. A total of 71 species were identified during this study. The result of the various indices affirms this heterogeneity and indicates a trophic state hypereutrophic for the Hammam Boughrara reservoir, eutrophic for the Bakhadda reservoir and meso-oligotrophic for Sidi Yacoub. The use of canonical correspondence analysis (CCA) has shown that the structure of rotifers is influenced by local environmental factors. Some species such as the genus Brachionus species have shown their preference for extreme conditions. The use of biotic indices is highly recommended for the trophic state evaluation of reservoirs for a better water resources management. Keywords Reservoirs . Physicochemistry . Rotifers . Trophic state . Biotic index . Water quality
Introduction The eutrophication of aquatic ecosystems keeps increasing due to nutrient inputs from diverse sources. This growth in nutrient inputs can lead to perilous ecological and water supply problems (Paerl et al. 2016). Reservoirs in the Mediterranean, which combine the distinctive characteristics of reservoirs, such as hydrographic basins larger than those of natural lakes and the poorly developed coastline which show seasonal water scarcity, are exceptionally affected by this process (Moreno-Ostos Responsible Editor: Thomas Hein * Ghiles Smaoune [email protected] 1
Laboratory of Dynamics and Biodiversity/USTHB/FSB, LP 32 El Alia, Bab Ezzouar, Algiers, Algeria
2
Laboratory of Ecology and Natural Ecosystems Management, Faculty of nature and life, and the earth and the universe, University of Tlemcen, BP 119, DZA-13000 Tlemcen, Algeria
et al. 2016; García-Chicote et al. 2019). Trophic state is regarded as the most important characteristic of aquatic ecosystem (Andronikova 1993; Wen et al. 2011). Various physical and chemical indicators a
Data Loading...
