José Barquín

1 Introduction Riparian zones, as the interface between freshwater and terrestrial ecosystems, represent key biodiversity hotspots. The strong influence of the river discharge shapes riparian forest communities according to different flood intensities and frequencies, as well as water table fluctuations in relation to the valley width and channel morphology (Douda 2010; Wohl 2019).

This is the first work including biopsies of surgical margins to study of the anastomotic fistulas pathogenesis. We have corroborated the role of collagenase and protease expression by Enterococcus, also demonstrating that the pathogen is not present in the colonic location before surgery. Our hypothesis is that is a regular inhabitant of the small intestine, which only colonizes the anastomosis when collagen is produced.

1. Introduction The “natural flow paradigm” [1] is acknowledged as the basic concept for a thriving river ecosystem; however, recognizing that certain key flow components must be conserved presents a unique challenge for managing river water resources sustainably.