Search for possible latitudinal ecotypes inDumontia contorta (Rhodophyta)

  • H. Rietema
  • C. van den Hoek


Effects of daylength and temperature on the formation of erect fronds (macrothalli) from crusts (microthalli) ofDumontia contorta (S. G. Gmel.) Rupr. from three localities in Nova Scotia and one locality in Southern Iceland were investigated and compared to such effects shown by strains from three different East Atlantic localities (Isle of Man; Zeeland, S. W. Netherlands; and Roscoff, Brittany, France). Although these strains showed small differences in their temperature-daylength responses, these could not be interpreted as latitudinal adaptations, and consequently no latitudinal ecotypes could be found forDumontia contorta in the N. Atlantic Ocean. Upright fronds are formed at a broad temperature range of about 4°–18°C and at daylengths ≤ 13 h. Only in the southernmost part of its distribution area can high autumnal temperatures be expected to block the reappearance of upright fronds after passage of the critical daylength in September. In the larger part of the distribution area even summer temperatures are not high enough to block formation of uprights and here apparently only short daylengths initiate the reappearance of young upright fronds in autumn. The consequences of these aspects of the life history regulation for the geographic distribution are discussed.


Waste Water Water Management Water Pollution Life History Geographic Distribution 
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Literature cited

  1. Ardré, F., 1970. Contributions à l'étude des algues marines du Portugal. — Port. Acta biol. (B)10 1–420.Google Scholar
  2. Ardré, F., 1971. Contribution à l'étude des algues marines du Portugal. — Bull. Cent. Étud. Rech. scient. Biarritz8 359–574.Google Scholar
  3. Bolton, J. J., 1983. Ecoclinal variation inEctocarpus siliculosus (Phaeophyceae) with respect to temperature growth optima and survival limits. — Mar. Biol.73 131–138.CrossRefGoogle Scholar
  4. Bolton, J. J. & Lüning, K., 1982. Optimal growth and maximal survival temperatures of AtlanticLaminaria species (Phaeophyta) in culture. — Mar. Biol.66 89–94.CrossRefGoogle Scholar
  5. Cambridge, M., Breeman, A. M. & Hoek, C. van den, 1984. Temperature responses of some N. AtlanticCladophora species (Chlorophyceae) in relation to their geographic distribution. — Helgoländer Meeresunters.38 349–363.Google Scholar
  6. Hoek, C. van den, 1982. The distribution of benthic marine algae in relation to the temperature regulation of their life histories. — Biol. J. Linn. Soc.48 81–144.Google Scholar
  7. Lüning, K., 1980. Control of algal life-history by daylength and temperature. In: The shore environment. Ed. by J. H. Price, D. E. G. Irvine & W. F. Farnham. Acad. Press, New York, 915–945.Google Scholar
  8. McLachlan, J. & Bird, C. J., 1984. Geographical and experimental assessment of the distribution of species ofGracilaria Grev. (Rhodophyta; Gigartinales) in relation to temperature. — Helgoländer Meeresunters.38 319–334.Google Scholar
  9. Rietema, H., 1982. Effects of photoperiod and temperature on macrothallus initiation inDumontia contorta (Rhodophyta). — Mar. Ecol. Prog. Ser.8 187–196.Google Scholar
  10. Rietema, H., 1984. Development of erect thalli from crusts inDumontia contorta (Gmel.) Rupr. (Rhodophyta, Cryptonemiales). — Botanica mar.27 29–36.Google Scholar
  11. Rietema, H. & Klein, A. W. O., 1981. Environmental control of the life cycle ofDumontia contorta (Rhodophyta) kept in culture. — Mar. Ecol. Prog. Ser.4 23–29.Google Scholar
  12. Rietema, H. & Breeman, A. M., 1982. The regulation of the life history ofDumontia contorta in comparison to that of several other Dumontiaceae (Rhodophyta). — Botanica mar.25 569–576.CrossRefGoogle Scholar
  13. Schneider, C. W., Suyemoto, M. M. & Yarish, C., 1979. An annotated checklist of Connecticut seaweeds. — Bull. geol. nat. Hist. Surv., Conn.108 1–20.Google Scholar
  14. West, J. A., 1972. Environmental regulation of the reproduction inRhodochorton purpureum. In: Contribution to the systematics of the benthic marine algae of the North Pacific. Ed. by I. A. Abbott & M. Kurogi. Jap. Soc. Phycol., Kobe, 213–230.Google Scholar

Copyright information

© Biologische Anstalt Helgoland 1984

Authors and Affiliations

  • H. Rietema
    • 1
  • C. van den Hoek
    • 1
  1. 1.Department of Marine Biology, Biological CentreUniversity of GroningenHaren (Gn.)The Netherlands

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