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Orientation affects the sensitivity of Acartia tonsa to fluid mechanical signals

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Abstract

Nearly all organisms show directional bias in sensitivity to environmental signals. In this study, the behavioral sensitivity of a common estuarine copepod, Acartia tonsa, varies significantly with respect to their orientation to a well-characterized fluid mechanical signal. Maximum sensitivity occurs at an angle of 25°–30° and lowest sensitivity occurs at angles of 60°–90° relative to the source. These results support the hypothesis that copepods are not uniformly sensitive to fluid signals and show directional bias in mechanosensitivity. The data also show that large copepods initiate their escape reaction further from the source than small copepods. There is, however, an uncharacteristically large increase in sensitivity at the transition between the nauplii and C1 stage despite being similar in size. This suggests that the mechanosensory system of the naupliar stages is less sensitive to fluid signals and helps to explain the higher predation rates experienced by nauplii.

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Acknowledgments

Thanks to Donald Webster for his constructive criticism. Support for this work was provided by NSF/IOS #0718832 awarded to DM Fields.

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  1. Bigelow Laboratory for Ocean Sciences, West Boothbay Harbor, ME, 04575, USA

    David M. Fields

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  1. David M. Fields
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Correspondence to David M. Fields.

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Communicated by M. A. Peck.

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Fields, D.M. Orientation affects the sensitivity of Acartia tonsa to fluid mechanical signals. Mar Biol 157, 505–514 (2010). https://doi.org/10.1007/s00227-009-1336-5

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  • DOI: https://doi.org/10.1007/s00227-009-1336-5

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