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  • 1990-1994  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Seasonal patterns of total and energy reserve lipids of dominant zooplanktonic crustaceans from a hyper-eutrophic lake (1992)
    Springer
    Oecologia 90 (1992), S. 560-571 
    Details
    ISSN: 1432-1939
    Keywords: Lipids ; Energy reserves ; Aphanizomenon ; Zooplankton ; Eutrophy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Seasonal patterns of lipid reserves and lipid classes of dominant zooplankton in a hyper-eutrophic lake were examined in relation to algal food resources. Triacylglycerol was the principle lipid energy reserve in all five species examined. During the height of the yearlyAphanizomenon flos-aquae bloom, lipid levels of the principle herbivores (Daphnia pulex andLeptodiaptomus sicilis) and an omnivore (Diacyclops bicuspidatus thomasi), were at their lowest concentration, suggesting that this cyanobacterium is nutritionally inadequate. As the cyanobacterial bloom began to collapse, bacterial numbers increased rapidly. The increase in bacterial numbers coincided with a large increase in areal lipid energy reserves ofDiaphanosoma leuchtenbergianum andChydorus sphaericus. Examination of seasonal patterns in the biomass of different algal species suggested thatRhodomonas minuta andCryptomonas erosa played a key role in nutrition, lipid deposition, and reproduction ofD. pulex andL. sicilis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01875451
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The influence of environmental factors on seasonal changes in bacterial cell volume in two prairie saline lakes (1993)
    Springer
    Microbial ecology 26 (1993), S. 9-20 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Bacterial biovolumes of hypertrophic Humboldt Lake (total dissolved solids = 3.3 g liter-1; 6 m deep) and oligotrophic Redberry Lake (total dissolved solids = 20.9 g liter-1; 17 m deep), Saskatchewan, were measured concurrently with a variety of environmental variables to identify the major factors correlated with volume changes. There was no difference (P 〉 0.05) in mean bacterial volume between Redberry Lake (0.084 ± 0.034 μm3 SD) and Humboldt Lake (0.083 ± 0.021 μm3 SD). Statistical analyses suggested there were marked differences in the factors associated with the pronounced seasonality of bacterial cell volumes in these two lakes. Variance in bacterial volume in the epilimnion of Redberry Lake was best explained by a multivariate regression model which included ciliate abundance and chlorophyll concentration (r 2 = 0.96). The model accounting for changes in hypolimnetic bacterial volume included ciliate numbers and primary production (r 2 = 0.94), of the measured variables. Bacterial volume in Humboldt Lake was most highly correlated with primary production (r 2 = 0.59). Bacterial production (estimated as the rate of thymidine incorporation into DNA) and growth (thymidine incorporation rate normalized to cell numbers) were not correlated to cell volume, with the exception of cocci volume in Humboldt Lake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00166025
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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