Blackwell Publishing Journal Backfiles 1879-2005
SUMMARY. Twenty-two % of the fresh water samples taken from Mexico, Colombia, Panama and the Canal Zone contained T. pyriformis. The habitats included springs, roadside ditches, creeks, rivers, ponds, and lakes. They ranged in elevation from sea level to 10,000 feet and in temperature from approximately 8° to 35°C. There was no correlation between temperature of habitat and resistance to high temperatures. Thirty-eight % of the clones isolated contained micronuclei and all but three of these were assigned to variety and mating type. The clones from Mexico all belong to variety 2, mating type V. Those from Colombia belong to mating type IV, variety 9, a new variety. Five mating types in variety 9 and nine in variety 2 were found in Panama and the Canal Zone. All clones grew in the chemically defined medium that supports the growth of strain E.
Type of Medium: