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52 UNIVERSITY OF KANSAS PUBLS., MUS. NAT. HIST. areas from 300 to 1000 meters; oak forest from 900 to 1500 meters; and, pine forest at elevations from about 1500 to 2750 meters. Much of the information presented on the Rio Mayo vegetation has been assimilated into the description of the vegetation of the northern and central sections of the state. Two important papers by Gentry on the vegetation of two mountains in Sinaloa appeared in 1946. One dealt with the flora of Sierra Tacuichamona, an isolated peak in the central part of the state (Gentry, 1946a). The other pertained to the vegetation of Sierra Surotato in the northern highlands (Gentry, 1946b). General works {e. g., Leopold, 1950) include Sinaloa in their coverage, but without specific details. Other than the papers by Shreve and Gentry, there are no detailed treatments of the flora of the state available at this time. Because of the paucity of information pertaining to the vegetation of Sinaloa, we were faced with several problems in our attempt to present a vegetational classification that would be useful in interpreting the distributional patterns of the fauna and still meet the demands of most plant geographers by presenting a classification of the vegetation by type, rather than a classification of animal habitat based on vegetation, as proposed by Duellman (1965:640). Difficulty was encountered in those areas where the natural vegetation had been cleared and the land currently is being used for agricultural purposes. Agricultural development has been favored by the availability of hydroelectric power, and water resources made usable by the recent construction of dams on the Rio Fuerte and on the Rio Culiacan. As a result, large areas are under cultivation from Los Mochis south to Guasave, and extensive tracts are being cleared north and west of Culiacan, The floodplains of the northern rivers are mostly devoted to vast fields of sugar, cotton, garbanzos, tomatoes, and corn. In the agricultural areas the native vegetation has been almost completely destroyed, and it is nearly impossible to detect any changes in the physiognomy or composition of the natural vegetation, if such changes did exist A system of vegetation classification proposed by Holdridge (1947:367-368) is utilized in this study. Holdridge contended that a plant formation of a particular area is a reflection of the interaction between mean annual precipitation and mean annual biotemperature with respect to the amount of evaporation and transpiration. With the aid of the chart presented by Holdridge (1964:18), Sinaloa can be conveniently divided into five bioclimates.
AMPHIBIANS AND REPTILES OF SINALOA, MEXICO 53 Each bioclimate is characterized by a different plant formation. The five plant formations, all of which are in the tropical region, are: Tropical Thorn Woodland, Tropical Serniarid Forest, Tropical Dry Forest, Subtropical Dry Forest, and Lower Montane Dry Forest (Fig. 7). MILES Scale 30 , 50 O K) 30 50 70 100 109 108 FIG, 7. Generalized vegetation map of Sinaloa, Mexico. TTW = Tropical Thorn Woodland; TSF = Tropical Serniarid Forest; TDF = Tropical Dry Forest; SDF = Subtropical Dry Forest; LMDF = Lower Montane Dry Forest, Tropical Thorn Woodland Tropical Thorn Woodland vegetation as used in this discussion includes: the subtropical mirnosaeae-cacti vegetation, as understood 4—3685
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