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  • predation  (2)
  • Anostraca  (1)
  • Brachionus patulus  (1)
  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Feeding the fairy shrimp Streptocephalus (Anostraca - Crustacea) with the rotifer Anuraeopsis (1995)
    Springer
    Hydrobiologia 308 (1995), S. 29-33 
    Details
    ISSN: 1573-5117
    Keywords: Anostraca ; predator-prey interaction ; rotifers ; Anuraeopsis ; Streptocephalus ; functional response ; filtration rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Laboratory-cultured Streptocephalus torvicornis were offered 8 concentrations (from 6 to 800 ind. ml−1) of Anuraeopsis fissa for periods of 2 h 30 min. Two size classes, small (male: 14.7 mm± 1.6, female: 15.4 mm± 1.3) and large (male: 20.0 mm±2.0, female: 23.1 mm± 1.5), of S. torvicornis were used. Functional response for large S. torvicornis (both sexes) plateaued at 400 rotifers ml−1, while in small specimens it did so at 200 prey ml−1. Females consumed significantly more (30%) prey than males. Large males consumed maximum 4730 rotifers h−1, females 6560 h−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00037784
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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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