APPROVED: James H. Kennedy, Major Professor Ricardo Rozzi, Committee Member Christopher B. Anderson, Committee Member William T. Waller, Committee Member Art Goven, Chair of the Department of Biological Sciences James D. Meernik, Acting Dean of the Toulouse Graduate School BENTHIC MACROINVERTEBRATES OF TEMPERATE, SUB-ANTARCTIC STREAMS: THE EFFECTS OF ALTITUDINAL ZONING AND TEMPERATURE ON THE PHENOLOGY OF AQUATIC INSECTS ASSOCIATED TO THE ROBALO RIVER, NAVARINO ISLAND (55°S), CHILE Tamara Andrea Contador Mejías Dissertation Prepared for the Degree of DOCTOR OF PHILOSOPHY UNIVERSITY OF NORTH TEXAS December 2011