Thermal ecotypes of amphi-Atlantic algae. II. Cold-temperate species (Furcellaria lumbricalis andPolyides rotundus)

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-degrees-C. In comparisons of eastern and western isolates, both F. lumbricalis, a North Atlantic endemic, and P....

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Bibliographic Details
Published in:Helgoländer Meeresuntersuchungen
Main Authors: Novaczek, I., Breeman, A. M.
Format: Article in Journal/Newspaper
Language:English
Published: 1990
Subjects:
NORTH-ATLANTIC
MARINE-ALGAE
CLADOPHORA CLADOPHORALES
OCEAN
PHAEOPHYCEAE
CHLOROPHYTA
RESPONSES
TOLERANCE
SEAWEEDS
GROWTH
Arctic
Pacific
North Atlantic
Online Access:http://hdl.handle.net/11370/92e80323-c704-4edb-a857-05e43037b98c
https://research.rug.nl/en/publications/thermal-ecotypes-of-amphiatlantic-algae-ii-coldtemperate-species-furcellaria-lumbricalis-andpolyides-rotundus(92e80323-c704-4edb-a857-05e43037b98c).html
https://doi.org/10.1007/BF02365481
Description
Summary: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-degrees-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-degrees-C and grew well from 0 to 25-degrees-C, with optimal growth at 10-15-degrees-C. P. rotundus tolerated -5 to 27-degrees-C, grew well from 5 to 25-degrees-C, and had a broad optimal range of 10-25-degrees-C. Both species tolerated 3 months in darkness at 0-degrees-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. A second hypothesis, that disjunct cold-temperate species should be more variable than pan-Arctic species, was not supported.

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