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  • 1
    Electronic Resource
    Electronic Resource
    Mixing patterns in Amazon lakes (1984)
    Springer
    Hydrobiologia 108 (1984), S. 3-15 
    Details
    ISSN: 1573-5117
    Keywords: tropical lakes ; Amazonia ; nutrients ; seasonality ; fish kill
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The diel mixing patterns of two small floodplain lakes, Lago Jacaretinga in the Amazon drainage, and Lago Cristalino in the Rio Negro system, were investigated during both the high-water and low-water states of the Amazon River hydrograph. Measurements included temperature, oxygen, ammonia, phosphate, and chlorophyll. In both lakes thermal stratification developed during the day and was eroded at night. During the low-water period when the lakes were shallow, nocturnal circulation extended to the lake bottom, whereas when the lakes were deeper (greater than about 5 m), circulation did not reach the bottom and an anoxic hypolimnion developed. During the low-water period, percent of oxygen concentrations were relatively high but always less than saturation. Low oxygen concentrations were observed during the high-water period. At all times nocturnal mixing supplied a significant amount of oxygen to the lake ecosystems. Nighttime upward mixing of recycled nitrogen and phosphorus also appeared to be important nutrient sources for algal productivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028177
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Mixing patterns in Amazon lakes (1984)
    Springer
    Hydrobiologia 108 (1984), S. 3-15 
    Details
    ISSN: 1573-5117
    Keywords: tropical lakes ; Amazonia ; nutrients ; seasonality ; fish kill
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The diel mixing patterns of two small floodplain lakes, Lago Jacaretinga in the Amazon drainage, and Lago Cristalino in the Rio Negro system, were investigated during both the high-water and low-water states of the Amazon River hydrograph. Measurements included temperature, oxygen, ammonia, phosphate, and chlorophyll. In both lakes thermal stratification developed during the day and was eroded at night. During the low-water period when the lakes were shallow, nocturnal circulation extended to the lake bottom, whereas when the lakes were deeper (greater than about 5 m), circulation did not reach the bottom and an anoxic hypolimnion developed. During the low-water period, percent of oxygen concentrations were relatively high but always less than saturation. Low oxygen concentrations were observed during the high-water period. At all times nocturnal mixing supplied a significant amount of oxygen to the lake ecosystems. Nighttime upward mixing of recycled nitrogen and phosphorus also appeared to be important nutrient sources for algal productivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02391627
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    How fish do what they do (1982)
    Springer
    Environmental biology of fishes 7 (1982), S. 297-298 
    Details
    ISSN: 1573-5133
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00002505
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Preface (1983)
    Springer
    Environmental biology of fishes 9 (1983), S. 83-86 
    Details
    ISSN: 1573-5133
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690854
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Mixing patterns in Amazon lakes (1984)
    Springer
    Hydrobiologia 108 (1984), S. 3-15 
    Details
    ISSN: 1573-5117
    Keywords: tropical lakes ; Amazonia ; nutrients ; seasonality ; fish kill
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The diel mixing patterns of two small floodplain lakes, Lago Jacaretinga in the Amazon drainage, and Lago Cristalino in the Rio Negro system, were investigated during both the high-water and low-water states of the Amazon River hydrograph. Measurements included temperature, oxygen, ammonia, phosphate, and chlorophyll. In both lakes thermal stratification developed during the day and was eroded at night. During the low-water period when the lakes were shallow, nocturnal circulation extended to the lake bottom, whereas when the lakes were deeper (greater than about 5 m), circulation did not reach the bottom and an anoxic hypolimnion developed. During the low-water period, percent of oxygen concentrations were relatively high but always less than saturation. Low oxygen concentrations were observed during the high-water period. At all times nocturnal mixing supplied a significant amount of oxygen to the lake ecosystems. Nighttime upward mixing of recycled nitrogen and phosphorus also appeared to be important nutrient sources for algal productivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00939167
    Location Call Number Limitation Availability
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    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    The taxonomic status ofRhabdolichops troscheli (Kaup, 1856), and speculations on gymnotiform evolution (1978)
    Springer
    Environmental biology of fishes 3 (1978), S. 379-384 
    Details
    ISSN: 1573-5133
    Keywords: Gymnotids ; Fish taxonomy ; Tropical fishes ; Planktivore ; Evolution ; Fish ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Anatomical and ecological studies of the gymnotiformRhabdolichops troscheli (Kaup 1856), one of the weakly electric fish of South America, indicate it to be unique among gymnotiforms in possessing certain characteristics found in characins. These include post-temporal fossae, well developed gillrakers, a planktivorous feeding mode, and diurnal feeding activity. We use these findings to speculate about the evolution of gymnotiform fishes, by assuming that these character states in this most primitive gymnotiform convey information about the group's evolutionary history. We suggest that the electric organs in this group of ostaryophysans have evolved primarily as a means of locating and capturing prey in river habitats of South America whose turbid waters result in low light penetration, ruling out visual sensing systems as an effective means of receiving information. Other aspects of morphology and behavior such as the absence or reduction of scales, and the nocturnal feeding activities characteristic of other gymnotiform, can be explained as consequences of food resource availability and predation pressures in these riverine environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000530
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    Paper (German National Licenses)
    Fulltext
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