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  • Artikel: DFG Deutsche Nationallizenzen  (3)
  • biomass  (2)
  • Africa  (1)
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  • Artikel: DFG Deutsche Nationallizenzen  (3)
Materialart
Erscheinungszeitraum
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  • 1
    Digitale Medien
    Digitale Medien
    Feeding preference and population growth of Asplanchna brightwelli (Rotifera) offered two non-evasive prey rotifers (1997)
    Springer
    Hydrobiologia 361 (1997), S. 77-88 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Rotifer ; biomass ; predation ; population growth ; handlingtime
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Population growth rates of the predatory rotifer Asplanchna brightwelli were determined at 25 °C using a large (Brachionus calyciflorus) and a small (Anuraeopsis fissa) rotifer prey species in three concentrations (0.5, 0.1 and 2.0 μg dry weight ml-1) and in five combinations. The prey ingestion time by the predator was also measured. For B. calyciflorus the ingestion time (22.97–8.95 s) was more than six times that of A. fissa (3.68 ± 0.93). Regardless of prey type, the population growth of Asplanchna increased with increasing food density. There was a direct correlation between densities of amictic and mictic fernales. The maximum rate of population growth (1.01 ± 0.10 d-1) was higher at high density of A. fissa prey than that at the same density of B. calyciflorus. Progressive increase of A. fissa density in the offered food combination resulted in a corresponding increase of the predator's number. Gut content analysis of A. brightwelli revealed that the number of prey ingested increased with increasing prey densities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1003189312452
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 2
    Digitale Medien
    Digitale Medien
    Culturing the fairy shrimp Streptocephalus dichotomus Baird using livestock waste – a reclamation study (1997)
    Springer
    Hydrobiologia 358 (1997), S. 199-203 
    Details
    ISSN: 1573-5117
    Schlagwort(e): fairy shrimp ; organic waste ; reclamation ; biomass
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The present study describes a defined culturetechnique for the fairy shrimp, Streptocephalusdichotomus. It emphasizes reclamation of low-cost organiclive-stock waste(cow-dung), lime powder, and urea. These compounds wereused to enrich algal and diatom populations in themedium. These algae and diatoms were fed to filter feedingfairy shrimps to yield anostracanbiomass. A production of 262 ± 6 animals l−1was obtained in an experimental tank compared to 36 ± 4animals l−1 in the controls. Interestingly,the total number of clutches in experimentalfemales (12 ± 2), relative to the control (7 ± 1),increased too.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1003136507728
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 3
    Digitale Medien
    Digitale Medien
    Faunal composition and biogeography of the calanoid copepods of West-Darfur, Sudan, with the description of Tropodiaptomus asimi n. sp. (1989)
    Springer
    Hydrobiologia 179 (1989), S. 195-203 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Diaptomids ; Tropodiaptomus ; Sudan ; Africa ; biogeography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Four calanoid species found in Darfur, Western Sudan, all belong to previously known Nile Valley elements, but had not been reported from its Western sector. One species is morphologically characterized and given a new name. Another had been found on the East African Plateau and in the Chad basin only. It is now recorded from an intermediate locality as well.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00006632
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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