1:38
Sexual Reproduction in Volvox
This video captures the sexual reproduction in a species of Volvox. This is a dioecious sp...
published: 16 Feb 2012
author: uaalgae
Sexual Reproduction in Volvox
This video captures the sexual reproduction in a species of Volvox. This is a dioecious species producing separate male and female colonies. After formation of the male sperm packets, they are released as an organized unit and go searching for a female colony. The female colony has now formed large oogonia and is producing a pheromone attracting the male sperm packets. Upon contact by the sperm packets with a receptive female colony, the sperm enter the female colony, disperse and fertilize the eggs while swimming inside the colony. Obviously, not all sperm packets reach the receptive female colonies concomitantly and some arrive too late. "Early bird catches the worm." Some sperm packets suffer a more cruel fate. For example, Stentors seem to be quite a planktonic preditor and misses one sperm packet but soon captures another. The species of Volvox is unknown at this time and was not collected from a natural water system in NE Ohio. This collection was taken from a large outdoor water trough filled with aquatic plants (from a southern state) at Hoffman's Pond and Garden Center in the Akron area.
published: 16 Feb 2012
views: 977
1:35
Nitella e D magne
Water fleas swimming in a glass...
published: 07 Oct 2009
author: Larinioidessclopetar
Nitella e D magne
0:26
Time Lapse - Riempimento del vacuolo in un Closterium
Questo Time Lapse, in cui ogni secondo di filmato corrisponde a 5 minuti reali, riprende l...
published: 21 Jan 2012
author: Pierluigi Cox
Time Lapse - Riempimento del vacuolo in un Closterium
Questo Time Lapse, in cui ogni secondo di filmato corrisponde a 5 minuti reali, riprende l'aumento di volume di una cellula di Closterium, per via del riempimento dei suoi vacuoli, di cui 2 possono esser osservati centralmente alla cellula
published: 21 Jan 2012
views: 159
author:
Pierluigi Cox
13:37
Flora of Ireland - Wiki Article
Ireland is in the Atlantic European Province of the Circumboreal Region a floristic region...
published: 11 Nov 2012
author: WikiPlays
Flora of Ireland - Wiki Article
Ireland is in the Atlantic European Province of the Circumboreal Region a floristic region within the Holarctic. Composition of the Flora Ireland has a small flora for a European country because of i... Flora of Ireland - Wiki Article - wikiplays.org Original @ http All Information Derived from Wikipedia using Creative Commons License: en.wikipedia.org Author: H. Zell Image URL: en.wikipedia.org ( Creative Commons ASA 3.0 ) Author: Carl Axel Magnus Lindman Image URL: en.wikipedia.org ( This work is in the Public Domain. ) Author: Rosser1954 Image URL: en.wikipedia.org ( This work is in the Public Domain. ) Author: Richard Webb Image URL: en.wikipedia.org ( Creative Commons ASA 3.0 ) Author: Unknown Image URL: en.wikipedia.org ( This work is in the Public Domain. ) Author: Patrice78500 Image URL: en.wikipedia.org ( This work is in the Public Domain. ) Author: Dr Charles Nelson Image URL: en.wikipedia.org ( Creative Commons ASA 3.0 ) Author: böhringer friedrich Image URL: http...
published: 11 Nov 2012
views: 3
author:
WikiPlays