| prevalence of helminths in a cyclic snowshoe hare population. | five species of helminths were monitored in a population of snowshoe hares (lepus americanus) near rochester, alberta, during 1961-1977. prevalence of both obeliscoides cuniculi and protostrongylus boughtoni among young hares averaged about 50% by age 2 mo, then tended to level off. prevalence of taenia pisiformis (cysticerci) and dirofilaria scapiceps rose more slowly, but continued to increase steadily beyond their mean levels of 8% and 1% at age 2 mo. there were well defined seasonal (within- ... | 1985 | 4032622 |