Abstract
Isolates ofStypocaulon scoparium Kütz. were collected from the Gulf of St. Lawrence, Canada and compared in culture to isolates collected from the Atlantic and Mediterranean coasts of Europe. The Canadian isolates grew at temperatures ranging from −2° C up to 22° C, with maximum rates of growth at 10–15° C; in trials lasting 3 months they survived the lowest temperatures but died at 22 or 25° C. In contrast, for the European isolates, maximum growth occurred between 10 and 27° C, and they died only after several months at 30 or 33° C. At the low end of the temperature range, European plants suffered damage or died at 5° C. Only the northernmost isolate, from Brittany, could both survive at 0° C and remain undamaged at 5° C in short days. All European isolates died at −2° C. Geographic distributions and the different thermal responses suggest that the eastern and western Atlantic populations are two different entities, the European plants being possibly of Tethyan origin, and the Canadian plants being possibly of north Pacific origin. The former would then have occupied the north Atlantic for thelongest time, which may partly explain the occurrence of ecotypic variation among these isolates.
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Novaczek, I., Breeman, A.M. & van den Hoek, C. Thermal tolerance ofStypocaulon scoparium (Phaeophyta, Sphacelariales) from eastern and western shores of the North Atlantic Ocean. Helgolander Meeresunters 43, 183–193 (1989). https://doi.org/10.1007/BF02367898
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DOI: https://doi.org/10.1007/BF02367898