PurposeTo determine how honeybees control the temperature of their thorax. HypothesisHeat is transferred from the thorax to the abdomen to thermoregulate the thorax in honeybeesWith warmer temperatures, thorax temperature is regulated by reducing the wing beat frequency as a result, reducing metabolic rates.BackgroundThe temperatures in which honey bees live in are constantly changing, making it difficult for these organisms to rely on weak chemical bonds. The decrease or increase of temperatures of even a few degrees could be fatal. These organisms have evolved to maintain their body heat through temperature changes by adjusting their metabolic rates, making these organisms endotherms. Honey bees are unique in the way that they adjust their internal temperatures according to the air temperature they are flying in, allowing them to stay out in the sun.MethodsFor the first experiment, the body temperatures of the thorax and the abdomen of the honey bees were measured while in flight in a variety of air temperatures. The foraging honey bees were captured and placed in a temperature controlled room between ten and forty degrees celsius. After one minute had passed, the honey bees were removed and restrained against a plastic surface where the thoracic and abdomen temperatures were measured ten seconds later using a hypodermic microprobe. In the second experiment, foraging honey bees are captured and placed into a chamber that measures the metabolic rates called a respirometry chamber. This chamber is in a temperature controlled room with the temperatures between twenty and forty degree celsius. After one minute of flight, the carbon dioxide emissions are measured (increase as metabolic rates increase, vise versa) as well as during the flight, the wing beat frequencies are measured using a digitized tape recording. ResultsAfter observing the results from the first test, based on the chart, it can be concluded that the thorax is endothermic as it has a narrower range despite the air temperature and does not transfer heat to the abdomen as the abdomen temperatures increased as the external air temperatures increased. Therefore, the thorax did not transfer heat or else the abdomen temperatures would have been higher than the air temperature since it would be absorbing heat from both sources. The second experiment demonstrated that the honey bees wings did not beat as quickly when the air temperatures were increased. Although there was not a positive correlation with the air temperature and the wing beat, there was a positive correlation between the wing beat frequency and the metabolic rates. Overall, it can be concluded that the second hypothesis which says that in a warmer environment, the metabolic rates and wingbeat frequencies decrease, is supported by the data obtained in the lab.