de.mpg.escidoc.pubman.appbase.FacesBean
English
 
Help Guide Disclaimer Contact us Login
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Colony formation in Scenedesmus: grazer-mediated release and chemical features of the infochemical.

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons56660

Elert,  Eric von
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons56677

Franck,  Achim
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

Locator
There are no locators available
Fulltext (public)
There are no public fulltexts available
Supplementary Material (public)
There is no public supplementary material available
Citation

Elert, E. v., & Franck, A. (1999). Colony formation in Scenedesmus: grazer-mediated release and chemical features of the infochemical. Journal of Plankton Research, 21(4), 789-804.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-E0AE-6
Abstract
In the unicellularly growing green alga Scenedesmus acutus, the formation of many-celled coenobia may be induced by an infochemical released by the grazer Daphnia magna. We used a standardized bioassay to obtain information about the release of the infochemical by actively feeding D.magna and its chemical nature. The infochemical could not be extracted from the alga or the grazer by aqueous or more lipophilic solvents. When the release of coenobia-inducing activity by actively feeding D.magna was investigated as a function of the individual's body mass, no increase with increasing individual body mass was observed, indicating that the chemical cue originates from zooplankton's non-digestive metabolism rather than from digestion of alga by the grazer. The infochemical released by D.magna can be characterized as an olefinic low-molecular-weight carboxylic acid. Hydroxy and amino groups can be excluded as moieties of the infochemical essential for biological activity. We present a method to concentrate the infochemical from Daphnia incubation water using lipophilic solid-phase extraction. Subsequent separation by reversed-phase HPLC yielded only one active fraction.