Change of Foraging and Hiding Behaviors in the Pacific AbaloneHaliotis discus hannaiin Response to Elevated Seawater Temperature

초록

Ocean warming induced by high CO(2)emission is expected to change the behavior of many marine poikilotherms. During the day, abalones take shelter under rocks or in crevices from which they emerge to forage in the evening. In this study, we explored the effect of changing seawater temperature on the foraging and hiding behaviors of the juvenile Pacific abaloneHaliotis discus hannai.First, we tested whether their hiding behavior in response to light differs depending on the temperature (11 degrees C, 14 degrees C, and 17 degrees C) when only artificial shelter was provided. We observed that the abalones hid under the shelter much faster at 17 degrees C than at 11 degrees C. Second, we tested whether their hiding and foraging behaviors changed in response to increasing temperature when both food and shelter were provided. At high water temperature (17 degrees C), abalones emerged more quickly than at low water temperature (11 degrees C), and the total number of feeding abalones was higher at high temperature than that at low temperature. However, the hiding speed in response to light in the morning was not significantly different among different temperatures. These results suggest that although the basic response to a single stimulus (i.e., light or food) was faster at higher temperatures than at lower temperatures, abalones may increase their boldness under higher temperatures when deciding whether to feed or hide.

키워드