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  • 1995-1999  (2)
  • 1980-1984
  • biogeography  (1)
  • cyst hatching  (1)
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Year
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  • 1
    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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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Rotifera, Cladocera, Copepoda, and Ostracoda from coastal wetlands in northeast Algeria (1998)
    Springer
    Hydrobiologia 386 (1998), S. 183-193 
    Details
    ISSN: 1573-5117
    Keywords: freshwater zooplankton ; wetlands ; Algeria ; biogeography ; Afrotropical relict fauna
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two wetland complexes in the El Kala area, northeast Algeria, were sampled for zooplankton over a two-month period (mid-May to mid-July 1993). Some samples from 1976 and 1978 were also studied. A total of 98 taxa (51 species of Microcrustacea and 47 species of Rotifera) are recorded. Twenty-seven of these (26.5% overall) are new to Algeria and/or to the Maghreb and Africa. A significant fraction of Afrotropical species was found in all four groups, beside species of northern (European) origin, and at least one cyclopoid copepod with an Irano-Turanian range. These results confirm the El Kala wetlands as an important relict pocket of species of various historical and geographical origin, and highlight the urgency of safeguarding these sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003538730152
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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