close to significancep = 0.08
We observed that the impoundment led to higher OM ratio in periphyton colonizing both substrates ( p < 0.05 for macrophyte periphyton and close to significance for wood periphyton [ p = 0.08 and p < 0.05 when RDCREF extreme value not considered]), indicating a tendency toward periphyton with higher organic content in the sectors affected by the flooding.