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  • 1
    Electronic Resource
    Electronic Resource
    Miscellaneous (1987)
    Springer
    Aquatic ecology 21 (1987), S. 121-121 
    Details
    ISSN: 1573-5125
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02255462
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  • 2
    Electronic Resource
    Electronic Resource
    102+ rotifer species (Rotifera: Monogononta) in Broa reservoir (SP., Brazil) on 26 August 1994, with the description of three new species (1995)
    Springer
    Hydrobiologia 316 (1995), S. 183-197 
    Details
    ISSN: 1573-5117
    Keywords: Rotifera ; Broa reservoir ; new species
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The monogonont Rotifera fauna of Lobo (Broa) reservoir (SP., Brazil), present in 12 samples collected on a single date during the cool season (26 August 1994), is listed and commented upon. In total, 102 species could be identified, three of which, Ascomorpha tundisii n.sp., Lecane broaensis n.sp. and Lepadella neglecta n.sp. are new to science. Lecane mitis Harring & Myers and Lepadella elongata Koste are redescribed. A note on the taxonomy of the Ascomorpha saltans-group is added.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00017436
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of zooplankton type and abundance on prey consumption by the fairy shrimp, Streptocephalus proboscideus (Anostraca: Crustacea) (1996)
    Springer
    Hydrobiologia 319 (1996), S. 191-202 
    Details
    ISSN: 1573-5117
    Keywords: fairy shrimp ; zooplankton ; prey size ; prey density ; electivity index ; filtration rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Laboratory cultured Streptocephalus proboscideus (three sizes (mm), viz. 8.44 ± 0.95 (virgin), 14.18 ± 1.49 (adult I) and 19.24 ± 1.52 (adult II)) were offered (separately for males and females) field collected zooplankton (12 prey types) at three levels of abundance (1.0 ml−1, 2.0 ml−1 and 4.1 ind. ml−1 in 30-minute feeding experiments. Gut contents, analyzed for abundance and diversity of prey type, showed that predator size, sex and their interaction had strong effects on prey consumption. Regardless of their size, and of prey density, S. proboscideus females consumed 25–90% more prey than males. Their filtration rates (adult II) were higher (125 ml ind.−1 h.−1) than those of males (30 ml ind.−1 h.−1) too. Rotifers had the highest numerical percentage in the gut, regardless of predator size or sex. Cladocerans were only consumed by adults I and II. Adult II females consumed 28.5–43.3 µg zooplankton dry weight ind.−1 h.−1. Size distribution of B. longirostris in the field and in the gut were closely similar. This study confirms S. proboscideus as a non-selective filter feeder. Since it did not eat jumping rotifers, copepod nauplii and copepodites, it may contribute to structuring its prey communities, because good escapers will be enriched in the medium, while poor escapers will be depleted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00013732
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of light, DMSO and glycerol on the hatchability ofThamnocephalus platyurus Packard cysts (1995)
    Springer
    Hydrobiologia 298 (1995), S. 175-178 
    Details
    ISSN: 1573-5117
    Keywords: Thamnocephalus ; light ; cyst hatching ; dimethyl sulfoxide ; glycerol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Effects of two light intensities and different concentration of dimethyl sulfoxide (DMSO) and glycerol on hydrated cyst hatching inThamnocephalus platyurus were studied. A maximum of 65±6% hatching was recorded within seven days at 2500 lux continuous light regime. Hatching was at a minimum during the first two days, peaked between the third and fourth days, decreased thereafter. Hatching success was a function of duration of light exposure. Eight percent of cysts hatched in the dark, while cysts exposed to 24h light and subsequently incubated in the dark showed 27±2% hatching. Hatchability was significantly increased (23%) in 0.0375% DMSO and 0.0125% glycerol. Concentration above 0.05% DMSO and 0.025% glycerol had no or a negative influence on hatching. Since low concentrations of DMSO were non-toxic, apolar compounds like Ca2+ ionophore can be dissolved in DMSO to study the role of Calcium in cyst hatching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033812
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  • 5
    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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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    ERRATUM: A note on the Diaptomidae of Thailand, including redescription of three species and description of a new species (Copepoda, Calanoida) (1998)
    Springer
    Hydrobiologia 377 (1998), S. 217-218 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Hydrobiologia 361: 201–223, 1998. Due to technical problems, Figures 91–94 on page 217 of the above volume were poorly reproduced. We now present the correct figures with their captions, on page 218 of this volume.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003474411353
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  • 8
    Electronic Resource
    Electronic Resource
    Demography and population growth of Asplanchna girodi (Rotifera) as a function of prey (Anuraeopsis fissa) density (1995)
    Springer
    Hydrobiologia 306 (1995), S. 97-107 
    Details
    ISSN: 1573-5117
    Keywords: prey-predator interaction ; population growth ; mortality ; rotifers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Laboratory studies on population growth and life table demography of Asplanchna girodi were conducted at 25±1 °c using Anuraeopsis fissa as prey at four (250, 500, 1000 and 2000 ind ml−1) densities. A prey density of 100 ind ml−1 per predator per day did not support A. girodi, while at the highest prey concentration, A. girodi reached a peak of 115±7 ind ml−1. The age distribution of A. girodi indicated that non-adults constituted about 2/3rd of the population at all prey concentrations. A decrease in prey availability resulted in increased mortality of non-adults. At the highest prey density, the rate of population increase (r) was 1.51 d−1. The significance of estimating mortality in population growth studies is discussed. Life table demography of A. girodi was also studied using the same prey at the same concentrations. None of the survivorship parameters (e.g. mean lifespan and mean survivorship) showed a significant relation to prey density. Net reproductive rate and generation time (but not rate of population increase) were affected by prey abundance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00016827
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  • 9
    Electronic Resource
    Electronic Resource
    ERRATUM: A review of the genus Eodiaptomus Kiefer, 1932, with the description of E. sanuamuangae n.sp. from Thailannd, and a redescriptionn of E.lumholtzi (Sars, 1889) from Australia (Copepoda, Calanoida) (1998)
    Springer
    Hydrobiologia 377 (1998), S. 213-215 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Hydrobiologia 361: 169–189, 1998. Due to technical problems, Figures 73–84 and Figures 85–94 were unfortunately omitted from pages 182 and 183, respectively, of the above volume, duplicates of Figures 1–6 appearing in their place. We now present the correct Figures with their captions, on pages 214 and 215 of this volume. Additionally there are four corrections to Table 1, which appeared on pages 186-188
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003481127283
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  • 10
    Electronic Resource
    Electronic Resource
    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
    Keywords: fairy shrimp ; organic waste ; reclamation ; biomass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003136507728
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