British Universities Film & Video Council

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Biology of Rotifers (2 Parts)

Synopsis
Part 2: Explains reproduction using three species as examples to include both oviparous and viviparous rotifers. Most rotifers are female and most of the time reproduce asexually. One group can only reproduce in this way and lacks males altogether. Under certain conditions females will produce eggs that hatch as males. The males are much smaller than the females, survive only a few hours, lack a gut and live only to fertilise females of the generation that gave birth to them. Impregnated females produce a special durable egg capable of surviving unfavourable environmental conditions for extended periods and such eggs will eventually hatch as asexually reproducing females. By using animals kept in culture in the laboratory, the film captures behaviour that occurs only infrequently in nature.
Language
English
Country
France
Medium
Video; Videocassette. VHS. col. 2 x 25 min.
Year of production
1983
Availability
OUT OF DISTRIBUTION
Uses
Courses in invertebrate reproduction or more generally in courses covering reproductive strategies including evolution and genetics.*
Subjects
Biology
Keywords
aquatic animals; invertebrate animals; rotifers

Sections

Title
Swimming and feeding
Synopsis
Part 1: A brief introduction to the systematic position of the group followed by the process of capture and ingestion. Diagrams show the fate of food particles and the mechanism of nervous control, and models show the articulation of the jaws. Demonstrate

Title
Reproduction
Synopsis
Part 2: Explains reproduction using three species as examples to include both oviparous and viviparous rotifers. Most rotifers are female and most of the time reproduce asexually. One group can only reproduce in this way and lacks males altogether. Under

Distributor

Name

French Scientific Film Library

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