Document Detail

Enrichment of omnivorous cercozoan nanoflagellates from coastal Baltic Sea waters.
MedLine Citation:
PMID:  21966360     Owner:  NLM     Status:  MEDLINE    
Free-living nano-sized flagellates are important bacterivores in aquatic habitats. However, some slightly larger forms can also be omnivorous, i.e., forage upon both bacterial and eukaryotic resources. This hitherto largely ignored feeding mode may have pronounced implications for the interpretation of experiments about protistan bacterivory. We followed the response of an uncultured group of omnivorous cercozoan nanoflagellates from the Novel Clade 2 (Cerc_BAL02) to experimental food web manipulation in samples from the Gulf of Gdańsk (Southern Baltic Sea). Seawater was either prefiltered through 5 µm filters to exclude larger predators of nanoflagellates (F-treatment), or prefiltered and subsequently 1∶10 diluted with sterile seawater (F+D-treatment) to stimulate the growth of both, flagellates and bacteria. Initially, Cerc_BAL02 were rapidly enriched under both conditions. They foraged on both, eukaryotic prey and bacteria, and were highly competitive at low concentrations of food. However, these omnivores were later only successful in the F+D treatment, where they eventually represented almost one fifth of all aplastidic nanoflagellates. By contrast, their numbers stagnated in the F-treatment, possibly due to top-down control by a concomitant bloom of other, unidentified flagellates. In analogy with observations about the enrichment of opportunistically growing bacteria in comparable experimental setups we suggest that the low numbers of omnivorous Cerc_Bal02 flagellates in waters of the Gulf of Gdańsk might also be related to their vulnerability to grazing pressure.
Kasia Piwosz; Jakob Pernthaler
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-09-26
Journal Detail:
Title:  PloS one     Volume:  6     ISSN:  1932-6203     ISO Abbreviation:  PLoS ONE     Publication Date:  2011  
Date Detail:
Created Date:  2011-10-03     Completed Date:  2012-03-01     Revised Date:  2013-06-27    
Medline Journal Info:
Nlm Unique ID:  101285081     Medline TA:  PLoS One     Country:  United States    
Other Details:
Languages:  eng     Pagination:  e24415     Citation Subset:  IM    
Department of Fisheries Oceanography and Marine Ecology, Sea Fisheries Institute in Gdynia, Gdynia, Poland.
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MeSH Terms
Bacteria / classification,  genetics,  growth & development*
Baltic States
Dinoflagellida / classification,  genetics,  growth & development*
Eukaryota / classification,  genetics,  growth & development
Food Chain*
In Situ Hybridization, Fluorescence / methods
Oceans and Seas
Seawater / microbiology,  parasitology
Species Specificity
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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