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  • 1985-1989  (2)
Document type
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Year
  • 1
    Electronic Resource
    Electronic Resource
    On the sexual reproduction ofDictyosiphon foeniculaceus (Phaeophyceae, Dictyosiphonales) (1985)
    Springer
    Helgoland marine research 39 (1985), S. 441-447 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Dictyosiphon foeniculaceus from Sweden and Newfoundland was studied in laboratory culture. Zoids from unilocular sporangia developed into dioecious microscopic filamentous gametophytes which produced uniseriate plurilocular gametangia in low temperatures (0 to 8 °C). Zygotes and unfused isogametes gave rise to filamentous protonemata on which parenchymatous macroscopic sporophytes were formed. Isolates from Sweden and Newfoundland were interfertile. Although formed in culture, genetically unisexual sporophytes were not detected in nature. Female gametes ofD. foeniculaceus produced a sexual pheromone. It was identified as finavarrene, which is also known as the sperm attractant inAscophyllum nodosum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01987412
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Sexuelle Fortpflanzung bei der braunen KrustenalgePseudolithoderma extensum (1989)
    Springer
    Helgoland marine research 43 (1989), S. 195-205 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Reproduction was studied inPseudolithoderma extensum (Crouan et Crouan) Lund (Lithodermataceae, Phaeophyceae) from Helgoland. Both gametophytes and sporophytes are crustose. Fertile gametophytes were found in nature in January and February. They released motile isogametes from plurilocular gametangia, each gamete leaving its locule through a separate opening. Plasmogamy was observed directly under the microscope. In laboratory culture, zygotes developed to crustose thalli, whereas unfused gametes died soon after germination. Sporophytes were found in nature with fertile unilocular sporangia in March. In culture, zoospores released from these sporangia also developed to crusts. Kuckuck’s observation at the beginning of the century (1912a) thatP. extensum exhibits an alternation of isomorphic generations and isogamy is thus confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02367899
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    Paper (German National Licenses)
    Fulltext
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