|
|
 |
|
|
| |
Communication at the NABS Annual meeting, Keystone, 2000
(288) MONITORING WATER ECOLOGICAL QUALITY OF MEDITERRANEAN RIVERS USING MACROINVERTEBRATES: CRITERIA TO SELECT THE COLLECTING PLACES.
P. Pinto and H. Dias Figueiredo. Departtment of Biology, University of Évora, 7001 ÉVORA codex Portugal
This study, promoted by he Regional Environmental Authority (DRA Algarve), aims the evaluation of the criteria to select collecting places for ecological quality monitoring programmes on temporary Mediterranean rivers. 27 collecting places, covering different small and medium basins, was selected on the South of Portugal. This selection was based on the criteria established by the European Union Framework proposal of the Water Ecological Quality: geology (calcareous, siliceous); drainage area (up to 100 Km2, from 100Km2 to 1000Km2) and ecotype (according to climatic and vegetation features). Benthic macroinvertebrate were sampled with a kick net during five minutes in spring. All the organism were identified down to family level. A canonical correlation analysis, after choosing the best predictors by forward selection was performed. Mean and maximum current velocity, pH, CBO5 and silt percentage were the best predictors from the 19 environmental variables evaluated. All the selecting criteria have been identified as good predictors. However, geology denoted a very low influence when compared to the others. 42% of the total variation was explained by the selected predictors (12.4% pure environmental, 17.7% pure selecting criteria and 12.4% shared). Supplementary criteria must be evaluated in order to enlarge the pure contribution of the selection methodology.
Presented at 1:15 PM on Thursday, June 1, 2000 in Integrating Physical, Chemical, and Biological Indicators of Water Quality I
|
|
|
|
|
|
|
