Even though there was an increase of chlorophyll because of the nutrient addition, the macroinvertebrate community density as a whole was not affected. In this case, bacteria and macroinvertebrates were also observed and were compared to a control upstream stretch with low nutrient content. The second stream (Fuirosos) was forested and nutrients were added for 44 days. The first (GaiĆ ) was an unshaded agricultural stream, where high net community metabolism and chlorophyll concentration were only modified by flood episodes which caused the sloughing of the benthic community. Two different streams receiving high nutrient content were compared in relation to evidence provided by structural (biomass) and functional (community metabolism) descriptors.
0 Comments
Leave a Reply. |