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  • Electronic Resource  (4)
  • predation  (2)
  • Brachionus  (1)
  • Brachionus patulus  (1)
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  • Electronic Resource  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Competitive interactions between herbivorous rotifers: importance of food concentration and initial population density (1996)
    Springer
    Hydrobiologia 331 (1996), S. 1-7 
    Details
    ISSN: 1573-5117
    Keywords: Rotifer ; Brachionus ; Anuraeopsis ; initial population density ; competition ; food level ; population growth rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We studied the outcome of competition between a large (Brachionus calyciflorus) and a small (Anuraeopsis fissa) rotifer species at five algal (Scenedesmus acutus) concentrations (0.5 × 106 to 40.5 × 106 cells ml−1) and with varying initial densities in mixed populations (100 to 0% of B. calcyciflorus or A. fissa), the combined initial biomass being 0.2 µg ml−1 in all test jars. Experiments were conducted at 28 ± 1 °C. Regardless of food concentration, B. calcyciflorus showed a greater increase in biomass than A. fissa, peak densities (mean ± standard error) at the lowest food concentration in the controls being 1.34 ± 0.31 µg dry weight ml−1 and 0.82 ± 0.08 dry weight ml−1, respectively. At the lower food concentrations, A. fissa displaced B. calyciflorus and vice versa at the higher food concentrations. At the intermediate food concentrations of 4.5 × 106 cells ml−1, B. calyciflorus outcompeted A. fissa only if its initial population density was three times higher. The rates of population growth in controls varied from 0.792 ± 0.06 d−1 to 1.492 ± 0.13 d−1 for B. calyciflorus and 0.445 ± 0.04 to 0.885 ± 0.01 for A. fissa depending on food level. When both species were introduced together, low food levels favoured higher abundance of A. fissa than B. calyciflorus, suggesting, in nature, it is likely that small Anuraeopsis colonize oligotrophic water bodies more successfully than larger Brachionus. The results also suggest that the outcome of competition depends not only on the size of the competing species and food availability but also on their colonizing density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025402
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    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
    Keywords: Rotifer ; biomass ; predation ; population growth ; handlingtime
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003189312452
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Demographic parameters of Brachionus patulus Muller (Rotifera) exposed to sublethal DDT concentrations at low and high food levels (1986)
    Springer
    Hydrobiologia 139 (1986), S. 193-200 
    Details
    ISSN: 1573-5117
    Keywords: Rotifera ; Brachionus patulus ; DDT ; sublethal effects ; life history parameters ; demography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The combined effects of sublethal levels of DDT (0, 15, 30, 45, and 60 µg·l−1) and food (Chlorella at 1 and 3 × 106 cells ml−1) on the demography of the rotifer Brachionus patulus were studied. The average lifespan, life expectancy, net reproductive rate (Ro) and intrinsic rate of increase (r) were significantly greater at the higher food level, but declined with increasing DDT concentration. A significant DDT food interaction was manifested in the toxicity-mitigating action of the higher food density at higher DDT levels. The r values were negative at DDT levels 30 µg · l−1 and above, only when food density was low. The effective DDT concentration at which a given parameter value was reduced to 50% of that in the controls (EC50) was lower at lower food levels for both survivorship and reproduction, and lower for reproduction than for survivorship at either food level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028292
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Feeding responses of Asplanchna brightwelli (rotifera): laboratory and field studies (1993)
    Springer
    Hydrobiologia 255-256 (1993), S. 275-282 
    Details
    ISSN: 1573-5117
    Keywords: Asplanchna ; predation ; gut contents ; feeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Laboratory-reared A. brightwelli were offered 16 different prey rotifer species from the genera Anuraeopsis, Brachionus, Epiphanes, Filinia, Hexarthra, Lecane, Lepadella, Pompholyx, Proalides and Trichocerca. Feeding responses (prey encounter, escape, capture, rejection and ingestion) were recorded. In general, the predator's ingestion time was positively correlated with prey length. B. falcatus and H. intermedia were never captured. Once captured, smaller rotifer species were ingested. Gut contents of field-collected A. brightwelli revealed increased occurrence of prey numbers when concentrated plankton samples were preserved after some delay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025849
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    Paper (German National Licenses)
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