Physical and Chemical Interactions with Conspecifics Mediate Sex Change in a Protandrous Gastropod Crepidula fornicata

• Published in: The Biological bulletin (Lancaster) 2015-12, Vol.229 (3), p.276-281
• Main Authors: CAHILL, ABIGAIL E., JUMAN, ALIA REHANA, PELLMAN-ISAACS, AARON, BRUNO, WILLIAM T.
• Format: Article
• Language: English
• Subjects: Animal behavior; Animal sex recognition; Animal Shells; Animals; Biochemistry; Biodiversity and Ecology; Chemical interactions; Chemical properties; Conspecifics; Crepidula fornicata; ECOLOGY AND EVOLUTION; Environmental Sciences; Female; Female animals; Food supply; Gastropoda; Gastropods; Hermaphroditic Organisms; Hermaphroditism; Male; Male animals; Marine; Mating behavior; Mollusks; Mortality; Nonnative species; Physical contact; Physiological aspects; Sex (Biology); Sex Determination Processes; Sex recognition (Zoology); Snails; Snails - physiology; Social conditions; Social environment
• ISSN: 0006-3185; 1939-8697
• DOI: 10.1086/BBLv229n3p276

The protandrous marine snail Crepidula fornicata has been a theoretical and empirical model for studies of sex change for many decades. We investigated the social conditions under which sex change occurs in this species by manipulating physical and chemical contact with conspecifics. Male snails were either in physical and chemical contact with females or in chemical contact with, but physically isolated from, females. Males were tested both with living females and with empty, sterilized shells. Males that were physically touching a living female were less likely to change sex than the isolated controls, while males in chemical (but not physical) contact with females changed sex no slower than the isolated controls. These results provide experimental evidence that the factor controlling sex change in C. fornicata is due to a contact-borne inhibitor associated with female conspecifics. These findings serve as a basis for future studies of sex change in this model system.