Open Access

Upper temperature tolerance of North Atlantic and North Pacific geographical isolates ofChondrus species (Rhodophyta)

  • K. Lüning1,
  • M. D. Guiry2 and
  • M. Masuda3
Helgoländer Meeresuntersuchungen41:BF02366194


The upper survival temperature for most isolates ofChondrus crispus from localities ranging from northern Norway and Iceland to Spain, and for an isolate from Nova Scotia, was 28 °C after 2 weeks of exposure to temperatures of 20–31 °C at intervals of 1 °C. An upper survival limit of 29 °C was exhibited by a few European isolates from the English Channel, the North Sea, and one Irish isolate from the upper intertidal. The warm-temperate Japanese speciesC. nipponicus andC. giganteus formaflabellatus survived 30 °C, whereas 29 °C was the upper survival limit for the coldtemperatureC. pinnulatus formapinnulatus from northern Japan. A possible origin ofC. crispus in the north Pacific is discussed.