During the summer of 2008 a mesocosm experiment was executed to test the effects of temperature change on a duckweed-herbivore food web. Species combinations consisted of one or two duckweed resource populations and herbivorous waterlily aphids (Rhopalosiphum nymphaeae). These were grown in two different temperature regimes; one averaging 24°C and the other 27°C. Results did not indicate a significant effect of temperature on duckweed growth, or the presence of apparent competition. The duckweed populations also grew at the same rate with and without another strain of duckweed. However, aphid populations did not survive and duckweed populations were counted only at the beginning and at the end of the experiment. During the follow up experiment measurements were taken throughout and the duckweed fly replaced the aphid as the herbivore. Our previous experiments have shown the flies to have a greater negative impact on duckweed growth. We used a machine that counts duckweed frond surface area and number. By also taking duckweed biomass we have multiple metrics of resource population size.