Leising, A. W.. Scripps Institution of Oceanography, aleising@ucsd.edu
, . W.. ,

This study examines whether copepods exhibit area-restricted search, and if so, what effect starvation has on this behavior. Area-restricted search can be a useful foraging strategy for copepods, depending on the patchiness of their food as dictated by the physical environment; e.g. thin layers. Acartia clausi were placed within small aquaria containing different concentrations of the diatom, Skeletonema costatum. Once placed in the aquaria, the animals' swimming behavior was videotaped at high magnification for 1.5 hours at dusk time, using a dim red light. Copepods were starved for different lengths of time before the start of each experiment. Replicate beakers containing the same concentration of food as the video-taped aquaria and copepods that underwent the same acclimation procedures were sampled at 5 minute intervals for gut fluorescence analysis, as an estimate of the gut levels of the video-taped copepods. Fourteen different parameters of swimming behavior were analyzed from the videos for differences between the treatment aquaria and control aquaria containing no food, and for trends of behavior versus time and gut content. Accurate determination of these parameters should allow fairly accurate modeling of the short term feeding and displacement of copepods if the distribution of their food and the physical environment relevant to their foraging ambit are known.
Day: Monday, Feb. 1
Time: 02:45 - 03:00pm
Location: Sweeney Center
Code: SS01MO0245S