Environmental factors affecting the distribution of Chironomid larvae of the Seybouse wadi, North-Eastern Algeria
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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
PAGEPress Publications
2013-03-01
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| Series: | Journal of Limnology |
| Subjects: | |
| Online Access: | http://www.jlimnol.it/index.php/jlimnol/article/view/625 |
| Summary: | 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 <em>Chironomu</em>s <em>sp. 1</em>, <em>Cricotopus bicinctus</em> and <em>Cricotopus (Isocladius) sylvestris</em> from intolerant species as <em>Phaenopsectra flavipes</em>, <em>Rheotanytarsus sp.1</em> and <em>Cladotanytarsus sp. 1</em>. |
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| ISSN: | 1129-5767 1723-8633 |