Aquatic Sciences Meeting, Albuquerque 2001

SS23 In Transition: Biomechanics of Sensory Perception (Disciplinary Connections)

Date: Thursday, February 15, 2001, Time: 11:45:00 AM

Location: Acoma/Zuni/Tesuque

Jiang, H, , Johns Hopkins University, Dept. of Earth & Planetary Sci., Baltimore, Maryland, USA, houshuo.jiang@jhu.edu

Osborn, T, R, Johns Hopkins University, Dept. of Earth & Planetary Sci., Baltimore, Maryland, USA, osborn@jhu.edu

Meneveau, C, , Johns Hopkins University, Dept. of Mechanical Engineering, Baltimore, Maryland, USA, meneveau@titan.me.jhu.edu

THEORETICAL AND NUMERICAL STUDIES OF THE HYDRODYNAMICS AND CHEMORECEPTION OF CALANOID COPEPODS

The flow field surrounding a freely swimming copepod is calculated theoretically and numerically for different swimming behaviors. The results show that the flow geometry varies significantly for the different behaviors. A standing-still or slow-swimming copepod generates a cone-shaped and wide feeding current. Conversely, the flow field around a free-sinking or fast-swimming copepod is not cone-shaped, but is narrow and long. The slow-swimming or standing-still behavior is shown to be energetically more efficient than the fast-swimming one. The standing-still or slow-swimming copepod also generates a flow field that is more difficult to be detected by entrained prey. The copepod's chemoreception capability is evaluated numerically for the different behaviors. The results show that the copepod standing still, swimming slowly or sinking freely can use chemoreception to detect and locate individual algae remotely. Conversely, the copepod swimming fast may not be able to rely on chemoreception for remote detection. It is shown that in general the flow across the antennules does not pass through the capture area. Reorientation of the copepod in response to antennule inputs is necessary to capture the food.

This Session Listing

Aquatic Sciences Meeting, Albuquerque 2001

Quicklinks