Thermal ecotypes of amphi-Atlantic algae. 2. ...



Title Thermal ecotypes of amphi-Atlantic algae. 2. Cold-temperate species (Furcellaria lumbricalis and Polyides rotundus )
Author(s) Irene Novaczek, A. M. Breeman
Journal Helgolander Meeresuntersuchungen.Hamburg
Date 1990
Volume 44
Issue 3-4
Start page 475
End page 485
Abstract Two species of cold-temperate algae from the North Atlantic Ocean, Polyides rotundus and Furcellaria lumbricalis , were tested for growth and survival over a temperature range of -5 to 30 degree C. In comparisons of eastern and western isolates, both F. lumbricalis , a North Atlantic endemic, and P. rotundus , a species having related populations in the North Pacific, were quite homogeneous. F. lumbricalis tolerated -5 to 25 degree C and grew well from 0 to 25 degree C, with optimal growth at 10-15 degree C. P. rotundus tolerated -5 to 27 degree C, grew well from 5 to 25 degree C, and had a broad optimal range of 10-25 degree C. Both species tolerated 3 months in darkness at 0 degree C. In neither case could any geographic boundary be explained in terms of lethal seasonal temperatures, suggesting that these species are restricted in distribution by strict thermal and/or daylength requirements for reproduction. The hypothesis that northern species are more homogeneous than southern taxa in terms of thermal tolerance was supported.

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