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Dopamine reduces intensity of serotonin-induced spawning in the zebra musselDreissena polymorpha (Pallas)

✍ Scribed by Fong, Peter P. ;Noordhuis, Ruurd ;Ram, Jeffrey L.

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
532 KB
Volume
266
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

The effect of dopamine (DA) on serotonin (5‐HT)‐induced spawning in the zebra mussel Dreissena polymorpha (Pallas) was tested. Administration of 1 mM DA with either 0.3 mM or 0.5 mM 5‐HT significantly delayed spawning and reduced its intensity in both males and females compared with 5‐HT controls. In dose‐response experiments, a minimal DA concentration of 0.3 mM was necessary to delay spawning and reduce male spawning intensity to levels below that of the 5‐HT control. Mussels treated with 5‐HT‐DA or DA alone opened their valves initially, but after 1 hour most valves were closed and both inhalent and exhalent siphons appeared extended, squeezed, and narrow, with reduced aperture openings. Possible mechanisms for the observed reduction in spawning intensity are discussed. © 1993 Wiley‐Liss, Inc.

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