The effect of acute exposure to relative humidity and temperature on the worker caste of four species of fire ants

LIST OF FIGURES 1. Experimental apparatus used to maintain constant temperature and relative humidity .... 16 2. Mean head capsule width of two worker castes in four Solenopsis spp 36 3. Lethal times (LT) for major workers of three Solenopsis spp.exposed to 26.7°C and 0% relative humidity 38 4. Lethal times (LT) for major workers of three Solenopsis spp.exposed to 32.3°C and 0% relative humidity 39 5. Lethal times (LT) for major workers of four Solenopsis spp.exposed to 37.8°C and 0% relative humidity 40 6.Lethal times (LT) for minor workers of four Solenopsis spp.exposed to 26.7°C and 0% relative humidity 41 7. Lethal times (LT) for minor workers of four Solenopsis spp.exposed to 32.3°C and 0% relative humidity .42 8.Lethal times (LT) for minor workers of four Solenopsis spp.exposed to 37.8°C and 0% relative humidity 43 9. LTj.^ of the minor worker caste of four Solenopsis spp. at three temperatures and 0% relative humidity 44 10.LTQ-J of the minor worker caste of four Solenopsis spp. at three temperatures and 0% relative humidity 45 11.LTQ^ of the minor worker caste of four Solenopsis spp. at three temperatures and 0% relative humidity 46 12. LTcp) of the major worker caste of three Solenopsis spp. at three temperatures and 0% relative humidity 47 v 13.LTQ^ of the major worker caste of three Solenopsis spp. at three temperatures and 0% relative humidity 48 14.LTQQ of the major worker caste of three Solenopsis spp. at three temperatures and 0% relative humidity 49 VI CHAPTER I