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  • 1
    Electronic Resource
    Electronic Resource
    Short-term changes in the Barra Bonita reservoir (São Paulo, Brazil): emphasis on the phytoplankton communities (1996)
    Springer
    Hydrobiologia 330 (1996), S. 163-175 
    Details
    ISSN: 1573-5117
    Keywords: phytoplankton ; diversity ; mixing ; stratification ; stability ; disturbance hypothesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We investigated the biomass, primary productivity, species diversity and their controlling factors in the deeper region of the Barra Bonita reservoir (22°29′S and 48°34′W) in the State of São Paulo, Brazil. To accomplish this, short term changes (days and month) were measured during two periods of the year, winter 1993 and summer 1994. The response of the phytoplankton communities to the variability of the system, taking into account the Intermediate Disturbance Hypothesis (IDH), indicated that the frequency and intensity of the disturbances have a critical influence on the establishment of the communities. In Barra Bonita Reservoir the conditions for mixing in the winter were probably important for maintaining high diversity. On the other hand, in summer, the concentrations of suspended material, the high temperatures, and the greater stability of the water column, were probably responsible for permitting the establishment of Microcystis aeruginosa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024205
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  • 2
    Electronic Resource
    Electronic Resource
    Survival strategies of some species of the phytoplankton community in the Barra Bonita Reservoir (São Paulo, Brazil) (1998)
    Springer
    Hydrobiologia 367 (1998), S. 139-151 
    Details
    ISSN: 1573-5117
    Keywords: phytoplankton ; survival strategies ; microcosms ; tropical reservoir
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The dynamics of the phytoplankton community in the Barra Bonita Reservoir (São Paulo, Brazil) were studied through daily sampling in the field (integrated samples from the euphotic zone) and microcosm experiments, for two short periods: the winter of 1993 (June 30 to July 10) and the summer of 1994 (January 24 to February 2). The goal of the study was to evaluate and compare the variations in the composition of isolated phytoplankton community which occur over short periods of time. Three series were separated into Erlenmeyer flasks for each study period, with samples from the euphotic zone divided into three portions: total, smaller than 64 µm, and smaller than 20 µm. All of the Erlenmeyer flasks were inclubated in situ at the sampling station. The maximum period of incubation was 10 d. Variations of the community in the euphotic zone were characterised by high diversity and a community in a state of non-equilibrium in winter, without the predominance of any species. In the summer, the community presented a low diversity and a state of equilibrium, with the predominance of Microcystis aeruginosa. The microcosm experiments showed that the confinement of the community in the Erlenmeyer flasks, and therefore in isolation from the physical variability of the ecosystem, especially in relation to the mixing patterns, stimulated the return of the community to the initial phases of succession with the predominance of small species and those which grow rapidly (r-selective or C-strategist).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003276016149
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    Paper (German National Licenses)
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