The swimming behavior of the copepod Calanus marshallae under various food conditions Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/wh246v21n

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  • How certain aspects of the swimming behavior of the copepod Calanus marshallae vary as a function of different food conditions of Thalassiosira weissflogii was examined. A two video camera recording and controlled food environment aquaria system were used to record long-term swimming behavior and to determine 3- dimensional swimming paths during 24-hour and 4-hour experiments. The 24-hour experiments examined how die! activity level varied with and without food. The 4- hour experiments examined the following specific behavioral aspects: level of activity, time allocation between swimming modes, periodicity within modes, and swimming velocity. Swimming activity followed a diel pattern when food was available and remained relatively constant over a 24-hour period when food was not available. Swimming activity was intermittent, and active intervals consisted primarily of two distinct swimming modes: rise/sink and looping. A seasonal, or collection date, effect on swimming activity level and mode existed, and may have been related to the onset of diapause. Calanus marshallae modified two aspects of swimming behavior in response to exposure to food. First, non-feeding individuals did not exhibit looping behavior. Second, non-feeding individuals had higher rise swimming velocity compared to feeding individuals. However, none of the examined aspects of swimming behavior varied significantly among the different food conditions, independent of strong individual variation. Looping was more periodic and had significantly higher velocity than rise/sink swimming, yet both modes were effective methods of remaining in a favorable food patch. The absence of food condition effects suggest that swimming speed and duration alone may not reflect the food encounter process.
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