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OBSERVATIONS ON THE LIFE‐HISTORY OF BRYOPSIS HYPNOIDES LAMOUR. FROM NEWFOUNDLAND: A NEW VARIATION IN CULTURE 1, 2
Author(s) -
Bartlett Robert B.,
South G. Robin
Publication year - 1973
Publication title -
acta botanica neerlandica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0044-5983
DOI - 10.1111/j.1438-8677.1973.tb00898.x
Subject(s) - biology , range (aeronautics) , sexual reproduction , reproduction , zooid , botany , ecology , materials science , composite material
SUMMARY At its northernmost distributional limit in northeastern America, in Newfoundland, Bryopsis hypnoides Lamour. appears to have a heteromorphic, monophasic life‐history. Zygotes resulting from fusion of anisogametes develop in culture into prostrate filamentous germlings, these also reproducing sexually by anisogametes to form a new generation of the prostrate type. Erect Bryopsis later grew from the prostrate phase: asexual stephanokontic zooids were entirely absent. The life‐history in Newfoundland compares in part with that for B. hypnoides from northern parts of its European range; the presence of sexual reproduction in the prostrate phase in Newfoundland, however, is unique in Bryopsis and is not apparently a temperature dependent phenomenon. In the field Newfoundland B. hypnoides reaches sexual maturity in winter at temperatures less than 0°C. Germling phases studied in culture could not be located in the field. The question is raised as to the possible genetic isolation of Newfoundland B. hypnoides from populations in Europe.