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  • biomass  (2)
  • 21.60.CS  (1)
  • 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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  • 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
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  • 3
    Digitale Medien
    Digitale Medien
    High spin states of some nuclei around the N=Z=28 double closed shell (1989)
    Springer
    The European physical journal 334 (1989), S. 365-376 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 20.40. + z ; 23.20.-g ; 21.60.CS
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A spectroscopic study is performed for high spin states of55Fe,55Co and57Ni. To populate the investigated residues with a relevant cross section, the fusion evaporation reactions of30Si(28Si, 2pn)55Fe,30Si(28Si, 2np)55Co and4He(54Fe,n)57Ni were chosen. To identify the newγ transitions and to build the energy level schemes,γ — γ coincidence techniques together with excitation functions were employed. Angular distributions andγ — γ angular correlations allowed us to assign the spin values of the nuclear states. The previous level scheme of55Fe is extended into the region between 6.5–11 MeV of excitation energy, up to spin 27/2, while the yrast decay paths of57Ni and55Co are reported here for the first time. Experimental data are fairly well reproduced by Glaudemans' shell model calculations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294741
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