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  • 1
    Electronic Resource
    Electronic Resource
    Occurrence of bacterivory in Cryptomonas, a common freshwater phytoplankter (1989)
    Springer
    Oecologia 78 (1989), S. 473-476 
    Details
    ISSN: 1432-1939
    Keywords: Plankton ; Bacterivory ; Mixotrophy ; Phagotrophy ; Cryptomonas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Bacterivory was detected by incorporation of 0.57 μm diameter, fluorescent polystyrene beads and fluorescently labeled bacteria (FLB) in two cultured species of Cryptomonas (C. ovata and C. erosa), and a population of Cryptomonas sp in a humic, mesotrophic lake. Rates of ingestion and clearance were very low, and similar for the cultures and the in situ population. The in situ population incorporated 0.7–1.7 bacteria cell-1 h-1, thereby ingesting 0.3%–2.0% of the total bacterial numbers present in the water per day, and receiving less than 2% of its carbon content per day through bacterivory. Thus, bacterivory by Cryptomonas was quantitatively important neither as a sink for bacterial biomass, nor as a carbon source for the algal cells. Possibly, it served in the uptake of essential nutrients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378736
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Bioavailability and sources of DOC and DON in macrophyte stands of a tropical coastal lake (2000)
    Springer
    Hydrobiologia 436 (2000), S. 241-248 
    Details
    ISSN: 1573-5117
    Keywords: DOC ; DON ; microbial utilization ; tropical lake ; macrophytes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Dissolved organic carbon (DOC) and nitrogen (DON) derived from aquatic and terrestrial vascular plants provide a major energy and nutrient source for freshwater and coastal marine biota. The bioavailability of this material may to a large extent depend on plant species. In this study, we have compared the bioavailability of DOC and DON sampled in two distinct stands of Typha domingensisand Eleocharis mutatain a coastal tropical lake and in the adjacent ocean in the state of Rio de Janeiro, Brazil. Bioavailability of organic matter was assessed by regrowth bioassays using natural bacterial inocula. Nutrients were added to achieve carbon or nitrogen limitation. At all sampling sites, DON comprised over 95% of the total bioavailable nitrogen, suggesting its dominant role as a nitrogen source. The bioavailability of lacustrine DON (22% in the Typhastand and 34% in the Eleocharisstand) exceeded the bioavailability of DOC (8 and 10%, respectively) and exhibited a larger difference between the stands. 3H-leucine incorporation studies showed that lake bacterioplankton had a well balanced supply of C, N and P. Therefore, an accumulation of labile DON due to an excess nitrogen supply is not probable. We propose that a substantial part of the lake DON was newly formed within the macrophyte stands, while DOC was predominantly of terrestrial origin and more diagenetically changed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026537905947
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    Paper (German National Licenses)
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