Temperature effects on the toxicity of four trace metals to adult spotted Babylonia snails (Babylonia areolata)

A study was conducted to determine the median lethal toxicity of four heavy metals on the marine gastropod Babylonia areolata. Median lethal toxicity tests were conducted to observe the sensitivity of this gastropod to metals and how variations in temperature might affect toxicity of test elements. Four heavy metals were used in the study. It was observed that the 96-hr LC50 (in mg/L) for the different metals was found to be nickel (Ni) 33.53 (35.22-28.43), copper (Cu) 44.59 (46.43-41.53), cadmium (Cd) 21.53 (23.43-18.37), and zinc (Zn) 27.34 (28.81-24.24) at room temperature 24 degrees C. With temperature as a variable, median lethal concentration (LC50) values were observed to increase from 22.41mg/L at 10 degrees C to 27.34mg/L at 28 degrees C and reduce to 18.43mg/L at 30 degrees C and a further rise in toxicity was observed at 35 degrees C where LC50 value was 12.7mg/L as seen in the case of Zn. It was also observed that at 40 degrees C thermal and chemical toxicity overlapped as 100% mortality was observed in controls. This trend was noted in all metals for Babylonia areolata indicating that temperature played an important role in determining LC50 values of toxicants.