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The Baltic Sea provides a unique model system for studying genetic effects of postglacial colonization and ecological differentiation, because all marine organisms must have immigrated after the opening of the Danish Straits 8000 years ago and responded to the development of the steep Skagerrak-Baltic salinity gradient. The red alga Ceramium tenuicorne(More)
Eight populations of Laminaria hyperborea from wave-exposed localities in Finnmark (70–71°N) were compared with two populations in Vega (65°N). Standing stock in shallow water (3–5 m) was within the same range in the two areas (6–16 kg fr. wt. m−2). Both the highest and lowest value of standing stock were registered in Finnmark. Degree of wave-exposure was(More)
There has been a rapid development of red algal mariculture during recent years (Hansen et al. 1981) . Seaweed biomass conversion to fuels, and the use of red algae for nutrient-scrubbing purposes, are new applications in addition to the traditional utilization as a source for phycocolloids and for food . Knowledge of growth capability, reproduction and(More)
Two species of Gelidium, provisionally referred to as G. pusillum and G. latifolium, are included in the Scandinavian flora and reach their northern limit of distribution on the Norwegian west coast. Small frond sizes due to adverse growth conditions, extreme phenotypic variability and lack of sexual reproduction make identification of specimens very(More)
In dem verunreinigten inneren Oslofjord tritt die BraunalgeAscophyllum nodosum (L.)Le Jol. nicht mehr auf. Mit der vorliegenden Untersuchung sollte geklärt werden, ob das verunreinigte Fjordwasser einen unmittelbar hemmenden Effekt auf die Entwicklung dieser Alge ausübt oder ob ein indirekter Einfluß vorliegt, indem bestehende biotische Faktoren eine(More)
Unialgal isolates ofGelidium latifolium from northern Spain and western Norway were compared with respect to specific growth rate, when kept under different combinations of light (20, 50, 100, 200, 300 µmol m-2s-1) and temperature (17, 20, 24, 28, 31 °C.) The Norwegian isolate grew almost twice as fast as the Spanish isolate under all combinations tested.(More)
Interfertility has been demonstrated in vitro between isolates of G. pusillum from Norway, France and the British Isles, but anomalies in reproductive behaviour were observed in the two Norwegian isolates. In one of the latter (Fedje), female gametophytes were sterile. Carpogonia and nutritive filaments were differentiated, but further development was(More)
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