Regulation of spirocyst discharge in the model sea anemone, Nematostella vectensis |
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Authors: | Sherry L Krayesky Janna L Mahoney Katherine M Kinler Stacey Peltier Warnesha Calais Kate Allaire Glen M Watson |
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Institution: | (1) Department of Biology, University of Louisiana at Lafayette, Lafayette, LA 70504-2451, USA; |
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Abstract: | Test probes were touched to tentacles to investigate whether discharge of spirocysts likely is regulated by hair bundle mechanoreceptors.
Significantly more spirocysts discharge onto test probes in the presence of vibrations at 11–15 Hz as compared to 0 Hz. Adding
N-acetylneuraminic acid, NANA, shifts maximal discharge of spirocysts upwards to 36–40 Hz, and possibly to 21–25 Hz. In contrast,
NANA shifts maximal discharge of basitrichous isorhiza nematocysts downwards to 1–20 Hz. Thus, discharge of cnidae (‘stinging
capsules’) is differentially regulated according to the type of cnida. Furthermore, it appears that chemodetection of N-acetylated sugars is not a prerequisite to capturing prey because, in seawater alone, maximal discharge of cnidae occurs
at frequencies overlapping movements of calmly swimming prey. Nevertheless, chemodetection of N-acetylated sugars broadens the range of frequencies stimulating maximal discharge of cnidae and, therefore, likely enhances
prey capture. |
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