Reference : Trend analysis in ecological status and macrophytic characterization of watercourses:...
Scientific journals : Article
Life sciences : Environmental sciences & ecology
http://hdl.handle.net/2268/185630
Trend analysis in ecological status and macrophytic characterization of watercourses: case of the Semois-Chiers basin, Belgium Wallonia
English
Sossey Alaoui, Khadija mailto [Université de Liège > DER Sc. et gest. de l'environnement (Arlon Campus Environ.) > DER Sc. et gest. de l'environnement (Arlon Campus Environ.) >]
Rosillon, Francis mailto [Université de Liège > DER Sc. et gest. de l'environnement (Arlon Campus Environ.) > DER Sc. et gest. de l'environnement (Arlon Campus Environ.) >]
Tychon, Bernard mailto [Université de Liège > DER Sc. et gest. de l'environnement (Arlon Campus Environ.) > Eau, Environnement, Développement >]
4-Sep-2015
Journal of Water Resource and Protection
Scientific Research Pub Inc
Vol.7 No.13 2015
Yes (verified by ORBi)
International
1945-3094
1945-3108
Herndon
VA
[en] Macrophytes ; Semois-Chiers basin ; WFD ; IBMR ; Ecological quality
[en] In order to analyze the distribution and evolution of the aquatic vegetation and ecological status of the Semois-Chiers basin (Semois sub-basin and Chiers sub-basin), macrophyte surveys were conducted at 48 sites in 2007 and 2013.
Environmental parameters were also measured in order to characterize the waterbodies in terms of physico-chemical properties and anthropogenic pressure.
The two-way clustering and indicator value (INDVAL) methods were used to assess groups of sites according to their macrophytic composition and species communities. The results showed a clear difference between streams in the Lorraine area (calcareous watercourses) and in the Ardennes (siliceous).
Within each natural region, those with natural vegetation of high ecological status were separated from those dominated by resistant species.
The Macrophytical Biological Index for Rivers (IBMR), was calculated for the sites visited in 2010 and 2013 and the results show a trend towards an increase of IBMR values of polluted sites. For the latter, the Wilcoxon test was performed to assess the significance of the difference in quality between 2010 and 2013. This showed a statistically significant difference (p-value= 0.035).
Our results showed similarities with previous data, as well as some differences. The differences observed might indicate a gradual change in the composition of the vegetation in the study area, caused by changes in environmental conditions. They could also reflect a lack of information about the ecology of certain groups of plants, mainly bryophytes and macroalgae that were not considered in previous studies.
Despite the measures implemented under the EU’s Water Framework Directive (WFD), the current vegetation of the Semois river differs little from that observed in 1996. There is a slight improvement in the headwaters of a Semois river, described in previous studies as polytrophic and devoid of vegetation, with the appearance of macrophytic species. In some parts of the Chiers sub-basin, however, resistant species observed in 1999 persist.
Researchers ; Professionals ; Students ; General public ; Others
http://hdl.handle.net/2268/185630
http://www.scirp.org/journal/JWARP/

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