Macroinvertebrates and associatedmaterial were preserved in 4% formaldehyde. In the laboratory, the samples were washed and all macroinvertebrates were sorted and identified to the family level (Appendix A) through use of Domínguez et al. (2006), Fernández and Domínguez (2001), Merritt and Cummins (1996), and Domínguez and Fernández (2009).