Reproduction in the Red Algae

Resource Information

The work Reproduction in the Red Algae represents a distinct intellectual or artistic creation found in Randwick City Library. This resource is a combination of several types including: Work, Moving Image, Visual Materials.

Label

Reproduction in the Red Algae

Contributor

• Cytographics (Firm)
• Kanopy (Firm)

Distributor

• Cytographics (Firm)
• Kanopy (Firm)

Subject

• trueBiology

Language

eng

Summary

Reproduction in the red algae is unique. No flagellated stages are ever formed, and it is generally assumed that the various reproductive spores are inert. This video demonstrates that spores in many species are actively motile, either by gliding or amoeboid activity. This limited power of movement may turn out to be of considerable significance in survival strategies (e.g. dispersion, optimization of a germination site).. Sexual reproduction is also unique. The video briefly reviews the three-phase life cycle of red algae and then illustrates how sexual reproduction occurs. After release, male spermatia are passively carried to receptive female hairs, the trichogynes. Once attached, spermatia undergo a cycle of nuclear division (mitosis) without cell division. Then the wall between spermatium and trichogyne erodes away to form a fertilization pore. A little later, the two nuclei move through the pore into the trichogyne. We demonstrate that the behavior of the two nuclei is quite different. One (not always the first to emerge) moves toward the female cell for fertilization; the other moves toward the tip of the trichogyne where it appears to play no further role in reproduction. Thus, the two nuclei are subtly differentiated so as to interact with the motile systems of the trichogyne in different fashion.

Cataloging source

VDU

Characteristic

videorecording

Date time place

Originally produced by Cytographics in 2000

Language note

In English

Runtime

20

Technique

live action