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1 January 2008 The Eastern Mudsnail, Ilyanassa obsoleta, Actively Forages For, Consumes, And Digests Cysts Of The Dinoflagellate, Scrippsiella lachrymosa
Agneta Persson, Barry C. Smith, Mark S. Dixon, Gary H. Wikfors
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Abstract

The Eastern mudsnail, Ilyanassa obsoleta, was attracted to, consumed, and digested resting cysts of the dinoflagellate Scrippsiella lachrymosa when cysts were presented in grazing experiments. Twenty snails were observed individually for one hour in petri dishes divided into four parts wherein cysts were present in one quadrant, sediment particles of the same size range were in another quadrant, and two quadrants were free of particles. Actively foraging snails were nearly twice as likely to be found in quadrants containing S. lachrymosa cysts as in the other quadrants until cysts were consumed. Microscope observations of fecal pellets from snails feeding on cysts revealed digestive destruction of the cysts. These findings indicate that deposit-feeding grazers can actively seek dinoflagellate cysts as a food item, thereby influencing distribution of cysts and subsequent germination of dinoflagellate vegetative cells.

Agneta Persson, Barry C. Smith, Mark S. Dixon, and Gary H. Wikfors "The Eastern Mudsnail, Ilyanassa obsoleta, Actively Forages For, Consumes, And Digests Cysts Of The Dinoflagellate, Scrippsiella lachrymosa," Malacologia 50(1-2), 341-345, (1 January 2008). https://doi.org/10.4002/0076-2997-50.1-2.341
Published: 1 January 2008
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KEYWORDS
cyst ecology
deposit feeding
dinoflagellate resting stages
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