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  • Fish predation  (1)
  • Southern Andes  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of the selective feeding ofGalaxias maculatus (Salmoniformes, Galaxiidae) on zooplankton of a South Andes lake (1993)
    Springer
    Aquatic sciences 55 (1993), S. 65-75 
    Details
    ISSN: 1420-9055
    Keywords: Fish predation ; zooplankton ; selective feeding ; cladocerans ; copepods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of larval and juvenile predation ofGalaxias maculatus on a natural small-sized zooplankton was studied in a South Andes lake. Field data of zooplankton density and composition were combined with fish gut content analysis during a spring-summer season. Results showed thatGalaxias early stages ingested mostly planktonic preys. A shift was observed in prey electivity: larvae preferred copepod nauplii whereas juveniles preferred cladocerans. Larval predation provokes the failure of the summer cohort of the calanoid copepodBoeckella gracilipes. The effect of juveniles is more undefined, but seems to prevent the reappearance ofCeriodaphnia in the summer plankton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877259
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  • 2
    Electronic Resource
    Electronic Resource
    Summer population of Hexarthra bulgarica in a high elevation lake of south Andes (1993)
    Springer
    Hydrobiologia 259 (1993), S. 33-37 
    Details
    ISSN: 1573-5117
    Keywords: Hexarthra bulgarica ; high-elevation lake ; copepod predation ; Southern Andes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A Hexarthra bulgarica population was studied over one summer in a high-elevation lake of the southern Andes. A brief description of specimens is included. The zooplankton is composed of this species and the calanoid copepod Pseudoboeckella gibbosa. The lake lacks vertebrate predators. Analysis of Pseudoboeckella guts showed that its omnivorous diet included Hexarthra. A biogeographical comparison is made between this and other American high-elevation lakes. It is concluded that the Hexarthra population is controlled by predation and by extreme abiotic conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00005962
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    Paper (German National Licenses)
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