. Bulletin. Science. BEAVERS IN MEXICALI 117 II5°45 32°45' II5°30 IIS^IS' II5°00 II4°45 II4°30 V\ MEXICALI r -32°30 SAN LUIS RIO COLORADO 32°I5' 32°00'. ISLA PELICANO GOLFO DE STA. CLARA Fig. 1. Sites with beaver activity in the Valle de Mexicali, Mexico. Circles represent beaver pres- ence in October-November 1995. Plus signs, sites with evidence of past use by beavers. Numbers indicate waterbodies, and letters, specific locations: 1 = Canal Medanos, 2= Canal El Alamo, 3 = Rio Colorado, 4 = Rio hardy, 5 = Canal El Caiman (formerly Canal Pescaderos), 6 = Cienega de Santa Clara, A = Presa Morel
. Bulletin. Science. BEAVERS IN MEXICALI 117 II5°45 32°45' II5°30 IIS^IS' II5°00 II4°45 II4°30 V\ MEXICALI r -32°30 SAN LUIS RIO COLORADO 32°I5' 32°00'. ISLA PELICANO GOLFO DE STA. CLARA Fig. 1. Sites with beaver activity in the Valle de Mexicali, Mexico. Circles represent beaver pres- ence in October-November 1995. Plus signs, sites with evidence of past use by beavers. Numbers indicate waterbodies, and letters, specific locations: 1 = Canal Medanos, 2= Canal El Alamo, 3 = Rio Colorado, 4 = Rio hardy, 5 = Canal El Caiman (formerly Canal Pescaderos), 6 = Cienega de Santa Clara, A = Presa Morelos, B = Campo Mosqueda, and C = Vado de la Carranza. mosissima) (Zengel et al. 1995), which explains why neither we nor colleagues who have worked in the area have seen any evidence of beavers. In two cases, beavers had cut stems of young tamarisks, and in two sites they seemed to be relying exclusively on tule roots {Scirpus americanus). Tappe (1942) considered that tules could be a more important food than commonly considered. We found them to be used rarely, and in one of the sites with heavy use of tules, beavers had been using willows until the drying of the steep-sided pool they lived in left such trees out of reach. Tules seemed, therefore, to be an emergency food. Some people in the area eat beavers on occasion, but this does not seem to happen often. In two places, beavers were a nuisance, as they were felling trees that had been planted or were being cared for. Rather than killing the beavers, the people in charge protected the trees with old barrels and salvaged Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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