Sampling sites were chosen in function of their hydrological
relevance in order to allow an overview of the Reserve's water
quality (Fig. 1).
Almonda River stands for the most important
contribution to this wetland, hence the preferential choice of site
selection (sites 1, 2 and 3).
Furthermore collecting stations reflect
sequentially entrance, midpoint and exit of the Nature Reserve,
granting an overview of the water quality status. Sites were
partially chosen by accessibility characteristics, considering the
flooded period (site 4).
With the intent of covering most habitats
water quality of the natural lake, lentic environment, which under
flooding conditions contributes to thewater quality of the Almonda
River (site 5). Besides the Almonda River, another important hy-
drological contribution to the marsh exhibiting evidence of pollu-
tion problems demanded a new sampling location, outside of the
Reserve area within Vala das Cordas drainage ditch (site 6).
Geographical location of sites (Fig. 1) is differentiated by: