Abstract The temperature responses of six macroalgae, isolated from the Mediterranean Sea, were experimentally determined and correlated with their geographic boundaries in the North Atlantic Ocean. The algae fall within three phytogeographic groups: (1) the warm-temperate Mediterranean-Atlantic group (Carpomitra costata), (2) the Amphiatlantic temperate group (Colpomenia peregrina and Stictyosiphon soriferus) and (3) the Amphiatlantic tropical to warm-temperate group (Gigartina teedii). One species from the genus Gracilaria i.e. G. verrucosa, has also been investigated. Gametophytes of Carpomitra costata survived at 1 --23 °C and grew sufficiently (> 20% of maximum rate) at 10--20 °C. The temperature responses of this phase did not explain the distribution boundaries of this species. Sufficient growth, reproduction and formation of macrothalli of Colpomenia peregrina proceeded at 10 to 25 °C. Germlings of this species grew better at higher temperatures than the macrothalli, but tolerated a similar temperature range (4--30 °C). Its geographic distribution cannot be entirely explained on the basis of the experimental data. Styctiosiphon soriferus survived at -1 to 28 °C and grew sufficiently between 5 and 25 °C. Reproduction occurred at 5 to 20 °C; at 25 °C sporulation was inhibited and the germlings did not form upright thalli. The experimental evidence
Botanica Marina – de Gruyter
Published: Jan 1, 1993
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