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The Resource Reproduction in the Red Algae, (online streaming)

Reproduction in the Red Algae, (online streaming)

Contributor
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.
Language
eng
Work
Publication
Extent
1 online resource (streaming video file) (21 minutes):
Note
  • In Process Record
  • Title from title frames
  • Film
Link
Instance
Label
Reproduction in the Red Algae
Title
Reproduction in the Red Algae
Contributor
Distributor
Subject
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
http://library.link/vocab/relatedWorkOrContributorName
  • Cytographics (Firm)
  • Kanopy (Firm)
Runtime
20
http://library.link/vocab/subjectName
Biology
Technique
live action
Label
Reproduction in the Red Algae, (online streaming)
Link
Instantiates
Publication
Note
  • In Process Record
  • Title from title frames
  • Film
Antecedent source
unknown
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
carrier
Configuration of playback channels
unknown
Content category
two-dimensional moving image
Content type code
  • tdi
Content type MARC source
rdacontent
Control code
kan1238408
Dimensions
unknown
Extent
1 online resource (streaming video file) (21 minutes):
File format
unknown
Form of item
online
Level of compression
unknown
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Medium for sound
other
Other physical details
digital, .flv file, sound
Publisher number
1238408
Quality assurance targets
not applicable
Reformatting quality
unknown
Sound
sound
Sound on medium or separate
sound on medium
Specific material designation
  • remote
  • other
System control number
(OCoLC)956908488
System details
Mode of access: World Wide Web
Video recording format
other
Label
Reproduction in the Red Algae, (online streaming)
Link
Publication
Note
  • In Process Record
  • Title from title frames
  • Film
Antecedent source
unknown
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
carrier
Configuration of playback channels
unknown
Content category
two-dimensional moving image
Content type code
  • tdi
Content type MARC source
rdacontent
Control code
kan1238408
Dimensions
unknown
Extent
1 online resource (streaming video file) (21 minutes):
File format
unknown
Form of item
online
Level of compression
unknown
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Medium for sound
other
Other physical details
digital, .flv file, sound
Publisher number
1238408
Quality assurance targets
not applicable
Reformatting quality
unknown
Sound
sound
Sound on medium or separate
sound on medium
Specific material designation
  • remote
  • other
System control number
(OCoLC)956908488
System details
Mode of access: World Wide Web
Video recording format
other

Subject

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