Apical sensory neurones mediate developmental retardation induced by conspecific environmental stimuli in freshwater pulmonate snails

Development
E E VoronezhskayaLeonid P Nezlin

Abstract

Freshwater pond snails Helisoma trivolvis and Lymnaea stagnalis undergo larval development and metamorphosis inside egg capsules. We report that their development is permanently under slight tonic inhibitory influence of the anterior sensory monoaminergic neurones, which are the remnants of the apical sensory organ. Conspecific juvenile snails, when reared under conditions of starvation and crowding, release chemical signals that are detected by these neurones in encapsulated larvae and reversibly suppress larval development, thus providing a link between environmental signals and developmental regulation. Induced retardation starts from the trochophore stage and results in up to twofold prolongation of the larval lifespan. Upon stimulation with the signal, the neurones increase synthesis and release of monoamines [serotonin (5-HT) in Helisoma and dopamine in Lymnaea] that inhibit larval development acting via ergometrine-sensitive internal receptors. Thus, the novel regulatory mechanism in larval development of molluscs is suggested and compared with the phenomenon of dauer larvae formation in the nematode Caenorhabditis elegans.

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Citations

Jun 28, 2011·Integrative and Comparative Biology·Karen M Warkentin
Jun 7, 2011·Integrative and Comparative Biology·Karen M Warkentin
Dec 1, 2007·Annual Review of Ecology, Evolution, and Systematics·Scott D PletcherLinda Partridge
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Feb 1, 2007·Proceedings of the National Academy of Sciences of the United States of America·Amro Hamdoun, David Epel
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Mar 2, 2010·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·László Hiripi, Károly Elekes
Aug 7, 2008·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·Adrienn FillaKároly Elekes
Mar 17, 2007·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Karen M Warkentin
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Sep 19, 2019·EvoDevo·Olga V YurchenkoVyacheslav A Dyachuk
Jul 17, 2021·Evolution; International Journal of Organic Evolution·Elisabeth ZiegerAndreas Wanninger

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