Behavior and Respiration of the Burrowing Shrimps Upogebia Major (De Haan) and Callianassa Japonica (De Haan)

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Abstract
The behavior and metabolic rates of 2 burrowing shrimps, U. major (de Haan) and C. japonica (de Haan), which live on a tidal flat, were studied. The former is a filter feeder and has a simple Y-shaped burrow. The latter is a deposit feeder and continually burrows; this results in a complex burrow morphology. The respiration rate of U. major under saturated O2 conditions was about twice that of C. japonica. With a decrease in O2 concentration, the respiration rate of Upogebia decreased; that of Callianassa remained at about the same level until the O2 concentration fell to < 30% of the saturation value. The O:N ratio (respiration: NH4 excretion) of U. major was significantly higher than that of C. japonica, suggesting a difference in food sources. Under anoxic conditions, C. japonica survived 3-4 times longer than U. major. The physiological characteristics of the 2 shrimps may be closely correlated with the differences in behavior of the shrimps within their burrows.

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