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  • Acidication  (1)
  • Potamogetonaceae  (1)
  • amphibians  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Effects of water acidification on the distribution pattern and the reproductive success of amphibians (1986)
    Springer
    Cellular and molecular life sciences 42 (1986), S. 495-503 
    Details
    ISSN: 1420-9071
    Keywords: Acidication ; pH ; calcium ; (heavy) metals ; ammonium ; amphibians ; development of eggs ; hatching percentage ; mortality of larvae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Nine amphibian species were encountered in poorly buffered waters of The Netherlands (alkalinity ≦1 meq·l−1). These soft water systems are highly sensitive to acidifying precipitation. The number of species as well as the percentage of waters which harbour amphibian populations are strongly reduced in the extremely acid pH-class $$(\bar pH〈 4.0)$$ . The reproductive success of amphibians is negatively affected by low pH. The eggs become heavily infested with fungi (Saprolegniaceae). In acidifying systems many physico-chemical parameters are significantly correlated with the pH of the water. Strongly acidified waters are characterized by low alkalinity, conductivity and ionic content but high acidity and high concentrations of (heavy) metals and ammonium and a high relative sulphate concentration. Culture experiments with eggs and larvae ofRana arvalis. Rana ‘esculenta’, Rana temporaria andBufo bufo show that apart from the pH, elevated aluminium, cadmium and ammonium contents may also affect the reproductive success of amphibians.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01946687
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Chromosome numbers of the European seagrasses (1987)
    Springer
    Plant systematics and evolution 156 (1987), S. 55-59 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Potamogetonaceae ; Hydrocharitaceae ; seagrasses ; Zostera marina ; Z. noltii ; Posidonia oceanica ; Cymodocea nodosa ; Halophila stipulaceae ; Chromosome numbers ; cytotaxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The chromosome numbers of the five European seagrasses have been determined in material from several sites along the coasts of the Atlantic Ocean, the North Sea and the Mediterranean:Zostera marina L., 2n = 12;Z. noltii Hornem., 2n = 12;Posidonia oceanica (L.)Delile, 2n = 20;Cymodocea nodosa (Ucria)Aschers., 2n = 14, 2n = 28;Halophila stipulacea (Forsk.)Aschers., 2n = 18. The difference in chromosome morphology betweenZ. marina andZ. noltii supports the division of the genus into two subgenera.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937201
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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