Skip to main content

Free Content Chemosensory Responses of Heterotrophic and Mixotrophic Flagellates to Potential Food Sources

Download Article:
 Download
(PDF 536.0615234375 kb)
 
Chemosensory responses by freshwater heterotrophic and mixotrophic microflagellates to amino acids, bacteria and bacterial exudates were measured using the Van Houten T-maze assay. Positive responses by Monas sp. 1 were demonstrated to 0.1 M CasAmino acids within 30 min. Bacteria resuspended in sterile water elicited no response from Monas sp. 1 after 30 min, but a positive response was observed after 90 min. Monas sp. 2 also showed a positive chemosensory response to the presence of bacteria after 90 min. Strongest positive responses by Monas sp. 2 were to bacterial exudates with or without cells present. These data suggest that heterotrophic flagellates may be attracted to areas of high bacterial densities by chemical cues present in bacterial exudates. The Van Houten T-maze tests also indicated a strong positive response to a toxic bacterium, Chromobacterium violaceum. This may be due to the death and deposition of cells upon entry in the T-maze arm with the toxins. The pigmented mixotroph, Poterioochromonas showed no response to bacteria with or without exudates after 90 min, and a negative response after 24 h. Phytoflagellates may avoid bacteria as potential competitors for nutrients. Alternatively, the arm containing bacteria could have become chemically inhospitable after 24 h and the flagellates were responding to an adverse chemical stimulus.

26 References.

No Supplementary Data.
No Data/Media
No Metrics

Document Type: Research Article

Publication date: 1988-11-01

More about this publication?
  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more