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  • 1
    Digitale Medien
    Digitale Medien
    Biology and ultrastructure of the mycophagus, soil testate amoeba, Phryganella acropodia (Rhizopoda, Protozoa) (1990)
    Springer
    Biology and fertility of soils 9 (1990), S. 101-109 
    Details
    ISSN: 1432-0789
    Schlagwort(e): Phryganella acropodia ; Testate amoeba ; Growth rate ; Rhizopoda ; Feeding ; Fungal species ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary Clones of Phryganella acropodia were cultivated under different trophic conditions with bacteria as the food source. The doubling time was estimated to be 3 days. The edibility of four species of fungi, Aspergillus niger, Cunninghamella echinulata, Penicillium echinulatum and Stilbella bulbicola, was tested, but only Penicillium enchinulatum and Stilbella bulbicola were eaten and digested by the amoeba. An ultrastructure examination showed that there are two contractile vacuoles, many dictyosomes, a single nucleus with several nucleoli, and peroxisomes. The pseudopodia are filiform when attached to the substrate but change to lobose when the animal is floating. A thin organic membrane covers the aperture of resting forms.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00335791
    Standort Signatur Einschränkungen Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Native carbon mineralization of an acid organic soil after use of the chloroform-fumigation method to estimate microbial biomass (1989)
    Springer
    Biology and fertility of soils 8 (1989), S. 172-177 
    Details
    ISSN: 1432-0789
    Schlagwort(e): Biomass ; Chloroform fumigation-incubation technique ; Acid organic soil ; Carbon mineralization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary Two experiments were carried out on a dysmoder humus sampled from a depth of 2–5 cm from a mixed hardwood forest. In acid soil, the chloroform fumigation-incubation method failed to estimate the microbial biomass, not because bacterial growth was inhibited after fumigation but because a labile C source was taken up which differed from the killed biomass C.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00257762
    Standort Signatur Einschränkungen Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 3
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    Unbekannt
    Confirming the "Rapid phosphorus transfer from microorganisms to mesozooplankton in the Eastern Mediterranean Sea" scenario through a mesocosm experiment (2016)
    Oxford University Press
    Details
    Publikationsdatum: 2016-06-04
    Beschreibung: P-transport through the microbial food web was investigated in a mesocosm experiment in which orthophosphate was added to oligotrophic Cretan Sea water. As non-exclusive alternatives to traditional phytoplankton–zooplankton succession, two mechanisms for P-transport have previously been proposed: a stoichiometric shift in food quality (Tunnelling); and a transport through a predatory food chain from heterotrophic bacteria, bypassing phytoplankton (Bypass). Following P-addition, particulate C:P-ratio dropped from 436 to 44 (molar) within 1 day, and egg production increased after 2 days. This confirms the hypothesized stoichiometric shift and rapid copepod response of a "Tunnelling" scenario. Bacterial abundance responded positively to P-addition on Day 1, ciliates increased after Day 5 and new egg production peaks occurred on Days 5 and 9; a succession suggesting additional Bypass transport although the response expected in heterotrophic flagellate abundance was not confirmed. A small, but statistically not significant, increase in Chl a in the 0.6- to 2-µm size fraction also suggests possible additional P-transport through a phytoplankton–zooplankton succession. On the basis of the magnitude of the stoichiometric change and the short delay in egg production response, we consider the Tunnelling mechanism to be the most likely signal initiating egg production, but a Bypass, and possibly a traditional succession, may have contributed to maintain the elevated egg production.
    Print ISSN: 0142-7873
    Digitale ISSN: 1464-3774
    Thema: Biologie
    Publiziert von Oxford University Press
    Standort Signatur Einschränkungen Verfügbarkeit
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    PAPER CURRENT
  • 4
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    Unbekannt
    The Pattern of Change in the Abundances of Specific Bacterioplankton Groups Is Consistent across Different Nutrient-Enriched Habitats in Crete [Microbial Ecology] (2014)
    The American Society for Microbiology (ASM)
    Details
    Publikationsdatum: 2014-06-06
    Beschreibung: A common source of disturbance for coastal aquatic habitats is nutrient enrichment through anthropogenic activities. Although the water column bacterioplankton communities in these environments have been characterized in some cases, changes in α-diversity and/or the abundances of specific taxonomic groups across enriched habitats remain unclear. Here, we investigated the bacterial community changes at three different nutrient-enriched and adjacent undisturbed habitats along the north coast of Crete, Greece: a fish farm, a closed bay within a town with low water renewal rates, and a city port where the level of nutrient enrichment and the trophic status of the habitat were different. Even though changes in α-diversity were different at each site, we observed across the sites a common change pattern accounting for most of the community variation for five of the most abundant bacterial groups: a decrease in the abundance of the Pelagibacteraceae and SAR86 and an increase in the abundance of the Alteromonadaceae , Rhodobacteraceae , and Cryomorphaceae in the impacted sites. The abundances of the groups that increased and decreased in the impacted sites were significantly correlated (positively and negatively, respectively) with the total heterotrophic bacterial counts and the concentrations of dissolved organic carbon and/or dissolved nitrogen and chlorophyll α, indicating that the common change pattern was associated with nutrient enrichment. Our results provide an in situ indication concerning the association of specific bacterioplankton groups with nutrient enrichment. These groups could potentially be used as indicators for nutrient enrichment if the pattern is confirmed over a broader spatial and temporal scale by future studies.
    Print ISSN: 0099-2240
    Digitale ISSN: 1098-5336
    Thema: Biologie
    Publiziert von The American Society for Microbiology (ASM)
    Standort Signatur Einschränkungen Verfügbarkeit
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    PAPER CURRENT
  • 5
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    Unbekannt
    Mixotrophic protists and a new paradigm for marine ecology: where does plankton research go now? (2019)
    OXFORD UNIV PRESS
    In:  EPIC3Journal of Plankton Research, OXFORD UNIV PRESS, 41, pp. 375-391, ISSN: 0142-7873
    Details
    Publikationsdatum: 2020-03-12
    Beschreibung: Many protist plankton are mixotrophs, combining phototrophy and phagotrophy. Their role in freshwater and marine ecology has emerged as a major developing feature of plankton research over recent decades. To better aid discussions, we suggest these organisms are termed “mixoplankton”, as “planktonic protist organisms that express, or have potential to express, phototrophy and phagotrophy”. The term “phytoplankton” then describes phototrophic organisms incapable of phagotrophy. “Protozooplankton” describes phagotrophic protists that do not engage in acquired phototrophy. The complexity of the changes to the conceptual base of the plankton trophic web caused by inclusion of mixoplanktonic activities are such that we suggest that the restructured description is termed the “mixoplankton paradigm”. Implications and opportunities for revision of survey and fieldwork, of laboratory experiments and of simulation modelling are considered. The main challenges are not only with taxonomic and functional identifications, and with measuring rates of potentially competing processes within single cells, but with decades of inertia built around the traditional paradigm that assumes a separation of trophic processes between different organisms. In keeping with the synergistic nature of cooperative photo- and phagotrophy in mixoplankton, a comprehensive multidisciplinary approach will be required to tackle the task ahead.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Format: application/pdf
    Standort Signatur Einschränkungen Verfügbarkeit
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