Orientation Preference in Response to the Direction of Water Flow in 2 Species of Scallops with Different Shell Morphology

Abstract

Scallops are marine bivalves that have a unique ability to swim and visualize their environment. Their eyes allow them to detect light and moving particles. It also gives them the ability to sense their surroundings and look for more suitable locations. In addition, the animals change their orientation position with water flow in order to maximize their food intake and growth. Both Chlamys rubida and Chlamys hastata exhibit these abilities, despite their morphological and behavioral differences. However, because of their profound distinctions that separate them between species, we suspect that the two groups will exhibit differences in their orientation preference to the current. Orientation position will optimize growth and feeding for these species within their local environment. Our hypothesis on scallops’ orientation was tested in a flume tank. Their angle in respect to the water flow were measured and recorded for comparison. The experiment demonstrated that there was no statistical difference in orientation preference between the two species in a well-lit environment, and that their vision had no considerable influence on their orientation. However, we were able to find a statistical difference in how the two species preferred to orient themselves within a dark environment.