Comparación de caracteres corporales y del veneno de Bothrops alternatus entre poblaciones de las provincias de Buenos Aires y Entre Ríos, Argentina

some corporal characters and venom yield of adult specimens of bothrops alternatus from the isolated region of olavarría (tandilian region, buenos aires) and the region of continuous distribution of concordia (entre ríos) were compared. corporal length, weight, separation between fangs, venom yield by snake and the amount of protein in the venom were determi-ned. no differences in the distinct characters from specimens from both regions were found (p > 0.05). females were greater than males in both samples, 12-18% (p< 0.05) regarding the corporal length and of 38-57% (p 0.5; olavarría= 142 ± 65 mg / animal, concordia= 161 ± 80 mg / animal) even adjusting the venom yield with the corporal length by the relation mg of venom / corporal length (p > 0.6). no differences were observed in the protein content of the dry venom which was of 0.697 ± 0.096 mg of protein / mg of dry venom. from the study of these samples, it could be suggest that specimens from the isolated population of tandilia, does not present variation in the corporal size or the amount of venom yield regarding those of the continuous distribution (concordia).