Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (805.0 KB bytes)

Title: Mixotrophy and Nitrogen Uptake by Pfiesteria Piscicida (Dinophyceae)

Author: Lewitus, Alan J.; Willis, Bonnie M.; Hayes, Kenneth C.; Burkholder, JoAnn M.; Gasgow, Howard B. Jr.; Gilbert, Patricia M.; Burke, Marianne K.;

Date: 1999

Source: J. Phycol. 35, 1430-1437 (1999)

Publication Series: Miscellaneous Publication

Description: The nutritional versatility of dinoflagellates is a complicating factor in identifying potential links between nutrient eurichment and the proliferation of harmful algal bloom. For exmaple, although dinoflagellates associated with hamful algal blooms (e.g. red tides) are generally considered to be phototrophic and we inorganic nutrients such as nitrate or phosphate, many of these species also have pronounced heterotrophic capabilities either as osmorophs or phagotrophs. Recently, the widespread occurrence of the heterotmpbic toxic dinoflagellate Pfiesteria piscidia Steidinger et Burkholder, has been documented in turbid estuarine waters. Pfiesteria piscidia has a relatively proficient gmziug ability, but also has an ability to function as a phototroph by acquiring chloroplasts from algal prey, a process termed kleptoplastidy. We tested the abilily df kleptoplastidic P. piscicida to take up 15N-labled NH+4, NO-3, urea, or glutamate. The photosynthetic activity of these cultures was verified,inpart by use of the fluorochrome, primulin which indicated a positive relationship between photosynthetic starch production and growth irradiance. All four N substrates were taken up by P. piscicido, and the highest uptake rates were in the range cited for phytoplankton aad were similar, to N uptake estimate for phototrophic P. piscicido. The demonstration of direct nutrient acquisition by kleptoplastidic P. piscicido suggests that the response of the dinoflagellate to nutrient enrichment complex, and that the specified pathway of nutrient stimulation (e.g. indirect stimulation through enhancement of phytoplankton prey abundance vs. direct stimulation by saprotrophic nutrient uptake) may depend on P. piscicida's nutrient state (phagotrophy vs. phototrophy).

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
  • You may send email to pubrequest@fs.fed.us to request a hard copy of this publication. (Please specify exactly which publication you are requesting and your mailing address.)

XML: View XML

Citation:


Lewitus, Alan J.; Willis, Bonnie M.; Hayes, Kenneth C.; Burkholder, JoAnn M.; Gasgow, Howard B., Jr.; Gilbert, Patricia M.; Burke, Marianne K. 1999. Mixotrophy and Nitrogen Uptake by Pfiesteria Piscicida (Dinophyceae). J. Phycol. 35, 1430-1437 (1999)

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.