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Environmental factors affecting the distribution of Chironomid larvae of the Seybouse wadi, North-Eastern Algeria | Chaib | Journal of Limnology
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Environmental factors affecting the distribution of Chironomid larvae of the Seybouse wadi, North-Eastern Algeria
Nadjla Chaib, Zineb Bouhala, Lilia Fouzari, Laura Marziali, Boudjéma Samraoui, Bruno Rossaro
Abstract
A survey of the Seybouse wadi (North-Eastern Algeria) between 2008 and 2011 was conducted in 26 sampling sites located on the main river and its tributaries using chironomids. From 3264 collected larvae, forty-five chironomid species were identified, and were correlated to 13 environmental variables to predict determinant factors affecting their distribution. Indicator value (IndVal) analysis was first performed to determine indicator chironomid species according to several factors (sites, seasons, source distance, granulometry, conductivity, water temperature, dissolved oxygen, water velocity, pollution and the abundance of filamentous algae). Co-inertia analysis (CoIA) supported the IndVal results, emphasising an upstream/downstream gradient in the first axis, while a granulometry gradient was emphasised by the second axis. A pollution gradient was also highlighted in the plane of the first two axes, separating tolerant Chironomus sp. 1, Cricotopus bicinctus and Cricotopus (Isocladius) sylvestris from intolerant species as Phaenopsectra flavipes, Rheotanytarsus sp.1 and Cladotanytarsus sp. 1.
Keywords
chironomids, environmental factors, Seybouse river, North Africa, IndVal, co-inertia analysis (CoIA)
The Journal of Limnology [eISSN 1723-8633] is an Open Access, peer-reviewed journal published by PAGEPress, Pavia, Italy. All credits and honors to PKP for their OJS.