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  • plankton  (2)
  • ciliates  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Importance of ciliated protozoa in relation to the bacterial and phytoplanktonic biomass in an oligo-mesotrophic lake, during the spring diatom bloom (1993)
    Springer
    Aquatic sciences 55 (1993), S. 1-9 
    Details
    ISSN: 1420-9055
    Keywords: Lake ; ciliates ; mixotrophic species
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The abundance and the biomass of bacterial, phytoplanktonic, and ciliate communities were estimated at different depths during the spring planktonic development in an oligo-mesotrophic lake (the Pavin lake). The bacterial population, which consists mainly of free bacteria (94% of the total bacterial abundance), displays only low cell densities (0.6 to 7 × 105 cells · ml−1) and represents low biomass values (0.9 to 11.5 µgC·l−1) The bacteria represent from 0.9 to 23.8% (M = 9.7%) of the “microplanktonic biomass” (with the exclusion of heterotrophic nanoflagellates, i.e. bacteria + phytoplankton + ciliates, size range 0.2–160 µm). The abundance of the phytoplankton varies between 0.5 and 1.8 × 106 cells·l−1, and the biomass values between 12 and 118 µC·l−1. The phytoplankton population constitutes the largest part of the microplanktonic biomass (51.9 to 96.6%, M = 80.6%), and the diatomMelosira italica subsp.subarctica is the largely dominant species of this community. The population of ciliates, essentiallyOligotrichida andScuticociliatida, displays densities between 1.3 and 38.3 × 103 cells·l−1 (M = 6.7 × 103 cells·l−1), and biomass values vary from 0.10 to 16.30 µgC·l−1 (M = 6.01 µgC·l−1). The ciliates constitute thus from 0.1 to 26.4% (M = 9.8%) of the microplanktonic biomass. Whereas the oligotrichs are best represented in the euphotic zone, the small-sized scuticociliates dominate in the hypolimnion. Besides, species having symbionts and considered to be mixotrophic (Strobilidium gyrans, Strombidium viride, Stokesia vernalis) develop preferentially in the epilimnion and constitute more than 50% of the total ciliate biomass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877254
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Short-term variations in the abundance and cell volume of bacterioplankton in an artificial tropical lake (1998)
    Springer
    Hydrobiologia 385 (1998), S. 113-119 
    Details
    ISSN: 1573-5117
    Keywords: tropical lakes ; artificial lakes ; circadian variations ; plankton ; bacteria ; algae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Circadian and spatial fluctuations in bacterioplankton abundance and cell volume were examined, for the first time, in the Municipal Lake located in the down town area of Yaoundé (Capital of Cameroon, Central Africa, ca 3° 52′ N, 11° 31′ E). Bacterial cell volumes (range, 0.05 to 0.2 μm3) were consistent with those reported for other aquatic systems while bacterial densities (0.8 to 2 × 108 cells ml-1) were among the highest values reported in pelagic systems. These variables and chlorophyll a and dissolved oxygen concentrations within a single depth-zone varied from 13 to 61%, while water temperature fluctuated only from 2 to 6%. Spatial fluctuations of physical-chemical and biological variables were generally higher during the day-time than during the night-time. A significant diel variation was provided for bacterial cell volume in the surface waters where synchronized cell division was occurring during the night. The measured bacterial abundances in this study were 4 to 17 fold higher than values known from other lakes of similar trophic status, and both cell abundance and volume were not correlated with chlorophyll. We conclude that this was due to the dependence of bacterial populations to different sources of allochthonous substrates, including untreated sewage from the major influents of the lake, resuspension of benthic material, and substrate releasing from macrophytes which are prevalent in the littoral zone of the lake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003453709384
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  • 3
    Electronic Resource
    Electronic Resource
    Short-term variations in the abundance and cell volume of bacterioplankton in an artificial tropical lake (1998)
    Springer
    Hydrobiologia 385 (1998), S. 113-119 
    Details
    ISSN: 1573-5117
    Keywords: tropical lakes ; artificial lakes ; circadian variations ; plankton ; bacteria ; algae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Circadian and spatial fluctuations in bacterioplankton abundance and cell volume were examined, for the first time, in the Municipal Lake located in the down town area of Yaoundé (Capital of Cameroon, Central Africa, ca 3° 52′ N, 11° 31′ E). Bacterial cell volumes (range, 0.05 to 0.2 μm3) were consistent with those reported for other aquatic systems while bacterial densities (0.8 to 2 × 108 cells ml-1) were among the highest values reported in pelagic systems. These variables and chlorophyll a and dissolved oxygen concentrations within a single depth-zone varied from 13 to 61%, while water temperature fluctuated only from 2 to 6%. Spatial fluctuations of physical-chemical and biological variables were generally higher during the day-time than during the night-time. A significant diel variation was provided for bacterial cell volume in the surface waters where synchronized cell division was occurring during the night. The measured bacterial abundances in this study were 4 to 17 fold higher than values known from other lakes of similar trophic status, and both cell abundance and volume were not correlated with chlorophyll. We conclude that this was due to the dependence of bacterial populations to different sources of allochthonous substrates, including untreated sewage from the major influents of the lake, resuspension of benthic material, and substrate releasing from macrophytes which are prevalent in the littoral zone of the lake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003453709384
    Location Call Number Expected Availability
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    Paper (German National Licenses)
    Fulltext
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