Wiltshire, K. H. Max Planck Institute for Limnology, wiltshire@mpil-ploen.mpg.de
Lampert, W. H. Max Planck Institute for Limnology, Lampert@mpil-ploen.mpg.de

 
THE INDUCTION OF COLONY FORMATION IN SCENEDESMUS ACUTUS BY DAPHNIA: NEW INSIGHTS.
 
Morphological changes in Scenedesmus can be induced by predators such as Daphnia. Such induced morphological changes could result in costs to the algae. We investigate the possible resultant costs when algae, i.e., Scenedesmus acutus, change from a unicellular form to a multicellular form. Algal morph changes were induced in controlled experiments using `Daphnia waterŽ. Cell volumes, pigments, fatty acids, sinking rates, delayed and prompt fluorescence and productivity were monitored for the different morphological forms. This information is used to isolate likely physiological costs. New insights on the chemical identity of the Daphnia factor are presented and the ecological relevance of the colony induction is discussed.
 
Day: Thursday, Feb. 4
Time: 02:45 - 03:00pm
Location: Hilton of Santa Fe
 
Code: SS16TH0245H