Abstract
The brown algaLaminaria saccharina growing at Helgoland (North Sea) has smooth blades, whereas the blades of the same species occurring at the Isle of Man are covered with deep bullations. Gametophytes of both morphological types were grown in the laboratory and the resulting sporophytes of each type as well as hybrids were planted out in the sublittoral zone of Helgoland for four months. The Isle of Man type and the hybrids both formed bullations. The Isle of Man type differed further from the Helgoland type in that it had broader blades and did not tolerate the water temperatures above 14° C which prevail near Helgoland in summer. All experimental plants were removed from the sea before the blades became sporogenous.
Zusammenfassung
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1.
Zwei morphologisch verschiedene Formen der BraunalgeLaminaria saccharina (Helgoländer Form mit glatten Phylloiden, Form von der Isle of Man mit Phylloidhöckern) wurden gekreuzt.
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2.
Die von der Isle of Man stammende Form sowie die reziproken Bastarde entwickelten auch im Helgoländer Sublitoral Phylloidhöcker.
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3.
Die englische Form hatte breitere Phylloide als die Helgoländer Form und verfiel ab Juli, als die Wassertemperatur bei Helgoland 14° C überschritt.
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4.
Alle Versuchspflanzen wurden nach viermonatigem Aufenthalt wieder aus dem Meer entnommen. Eine Kontamination der Helgoländer Unterwasserflora mit der nichtheimischen Form kann ausgeschlossen werden.
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Lüning, K. Kreuzungsexperimente anLaminaria saccharina von Helgoland und von der Isle of Man. Helgolander Wiss. Meeresunters 27, 108–114 (1975). https://doi.org/10.1007/BF01611690
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DOI: https://doi.org/10.1007/BF01611690