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  • 1
    Electronic Resource
    Electronic Resource
    Strategies for building partnerships in the context of river basin management: The role of ecotechnology and ecological engineering (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Lakes & reservoirs 1 (1995), S. 0 
    Details
    ISSN: 1440-1770
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Notes: The theory of ecosystem management is described and its importance and application to the management of river basins and watersheds is considered. Eleven ecosystem principles and their application within the context of watershed management are discussed. The development of partnerships in river basin management is important. In their development, the research system, public and private sectors, and community participation are seen as key components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1770.1995.tb00003.x
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  • 2
    Electronic Resource
    Electronic Resource
    Plankton studies in a lacustrine environment (1976)
    Springer
    Oecologia 25 (1976), S. 265-270 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Weekly zooplankton samples were taken during the period February, 1972 to January, 1973 at station III in a shallow and turbulent tropical reservoir (Broa Reservoir, São Carlos, São Paulo, State-Brazil). The samples were taken by plankton standard net with 68 μ mesh size, and collected through the horizontal hawls during 3 min. Rotifera was the most abundant group with 77.6%; Cladocera 13.6%, and Copepoda 8.7% (adult and naupliae stages). Other forms like Chaoborus larvae and some worms occurred sporadically. The seasonal fluctuation of the total zooplankton was very irregular in warm and rainy season and more stable in the dry and cold season. The composition of the zooplankton and its patterns of seasonal variation for eutrophic and oligotrophic aquatic ecosystems, in tropical regions, may differ significantly from temperate waters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00345103
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  • 3
    Electronic Resource
    Electronic Resource
    Miscellaneous (1987)
    Springer
    Aquatic ecology 21 (1987), S. 121-121 
    Details
    ISSN: 1573-5125
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02255462
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  • 4
    Electronic Resource
    Electronic Resource
    Diel migration and vertical distribution of Cladocera in Lake D. Helvecio (Minas Gerais, Brazil) (1984)
    Springer
    Hydrobiologia 113 (1984), S. 299-306 
    Details
    ISSN: 1573-5117
    Keywords: tropical zooplankton ; diel migration ; thermocline ; cladocerans ; vertical distribution ; summer ; winter ; tropical lake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Six genera of Clad ocera (Diaphanosoma, Daphnia, Ceriodaphnia, Moina, Bosmina, Bosminopsis), each of them usually with only one species were found in Lake D. Helvecio, a natural valley lake located in the eastern part of Brazil. Diurnal migratory movements of the organisms observed in this lake showed a different pattern in different species. Closely related species, which explore the same food source, live in different layers, thus avoiding interspecific competition. The migratory behaviour of the species was studied mainly in relation to temperature and oxygen distribution in the lake. Thus, analyses were made in the summer (January, 1978) when a strong stratification occurs with the establishment of a thermocline and an oxycline. Comparisons were made also with the data obtained in winter (July, 1978), when a complete mixing of water occurs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026616
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  • 5
    Electronic Resource
    Electronic Resource
    Impact of Holoshestes heterodon Eigenmann (Pisces: Characidae) on the plankton community of a subtropical reservoir: the importance of predation by Chaoborus larvae (1993)
    Springer
    Hydrobiologia 254 (1993), S. 7-20 
    Details
    ISSN: 1573-5117
    Keywords: fish ; zooplankton ; Chaoborus ; reservoir ; limnocorral
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We analyzed the effects of planktivorous Holeshestes heterodon Eigenmann (Characidae) predation on the plankton community of a small subtropical reservoir, using four enclosures (volume about 17.5 m3), open to the sediment, established in the littoral zone. Two enclosures were stocked with fish (mean TL 5.7 cm), at a density of about 4–5 fish m−3 (approx. 8 g m−3), whereas two remained fishless. The experiment lasted a little longer than one month. In the fish enclosures, most Crustacea and Chaoborus larvae remained scarce, probably as a result of visually selective fish predation. In both fishless enclosures, Chaoborus larvae became abundant. However, in only one of these did large individuals become relatively numerous; this discrepancy in the demographic structure of the Chaoborus populations between the two fishless enclosures is unexplained. Only in the fishless enclosure without appreciable numbers of large Chaoborus did densities of Crustacea increase greatly. It is suggested that in the enclosure containing large Chaoborus individuals, crustacean populations were prevented from developing due to predation pressure, while the small Chaoborus larvae of the other enclosure could not readily consume these prey. Rotifers were low in abundance in the absence of fish, probably as a consequence of Chaoborus predation. Phytoplankton density increased in all four enclosures, due probably to the lack of water flow. Only in the fishless enclosure with high densities of crustaceans did phytoplankton abundance decrease markedly at the end of the experiment, perhaps because of grazing losses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007761
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of humic acid on growth and tolerance to cupric ions in Melosira italica (subsp. subartica) (1982)
    Springer
    Hydrobiologia 87 (1982), S. 247-254 
    Details
    ISSN: 1573-5117
    Keywords: Melosira italica ; humid acid ; plankton ; cupric ion tolerance ; culture conditions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An optimum medium for culturing Melosira italica (subsp. subartica) is described. The optimum concentration of humic acid for growth of this species in culture was found to be 46 µg/ml. Tolerance to cupric ions also increased by addition of humic acid. Cultures tended to maintain a pH of about 6.0. Some ecological implications are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007233
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of phosphorus and nitrogen enrichment on the phytoplankton in a tropical reservoir (Lobo Reservoir, Brazil) (1984)
    Springer
    Hydrobiologia 118 (1984), S. 177-185 
    Details
    ISSN: 1573-5117
    Keywords: enrichment ; phosphorus ; nitrogen ; phytoplankton ; tropical reservoir
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of enrichment with phosphate (0–500 µg. 1−1) and forms of nitrogen (nitrate, nitrite, ammonia an and urea) (0–3500 µgg. −1) on the phytoplankton growth of Lobo Reservoir (Brazil) were studied in July, 1979. Suspended matter, chlorophyll a, cell concentrations and the carotenoid:cchlorophyll ratio were estimated following 14 days of ‘in situ’ incubation. Phosphate alone caused no significant effects, but enrichment with nitrogen caused a substantial increase on the growth of phytoplankton. Comparison between the different forms of nitrogen showed insignificant effects after their additions with 350 µg. −1 and in combination with phosphate. However, when nitrogen was added in large quantities (3 500 µg. −1), significant differences between the nitrogeneous forms were found, with urea causing the strongest effect. In July, nitrogen is mhe main limiting nutrient to phytoplankton growth of Lobo Reservoir.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00021041
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  • 8
    Electronic Resource
    Electronic Resource
    Biomass (dry weight and carbon content) of plankton crustacea from Broa reservoir (Sao Carlos, S.P.-Brazil) and its fluctuation across one year (1989)
    Springer
    Hydrobiologia 179 (1989), S. 229-236 
    Details
    ISSN: 1573-5117
    Keywords: crustacea ; reservoir ; biomass fluctuation ; forcing functions ; rainy season ; windy period
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The dominance patterns of the main zooplankton groups depend on whether they are analysed by numerical density or dry weight. This fact is discussed in relation to the trophic state of the system. Biomass of planktonic crustaceans from Broa reservoir was analysed by dry weight. For Argyrodiaptomus furcatus organic carbon was also determined. Values of 4.42 µg C ind.−1 and 6.83 µg C ind.−1 were obtained for males and females, respectively. Seasonal fluctuation of the species showed two peaks of abundance: the rainy season (summer), and the windy period (winter), these factors being thus the principal controlling forces for the growth of the populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006636
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  • 9
    Electronic Resource
    Electronic Resource
    Humid acid influence on the growth and copper tolerance of chlorella sp. (1980)
    Springer
    Hydrobiologia 71 (1980), S. 261-263 
    Details
    ISSN: 1573-5117
    Keywords: Chlorella sp. ; humid acid ; cupric ions tolerance ; plankton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The authors describe and discuss experiments carried out withChlorella sp. in which the effect of humic acid on its growth was studied. Also the coupled effect of humic acid and tolerance to cupric ions was demonstrated. Some ecological implication are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00686132
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