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Volume 37- Number 1 - 2002
Article


Phenology of gametogenesis, maturity of conceptacles, fertility and embryogenesis in Durvillaea antarctica (Chamisso) Hariot ((Phaeeophyta, Durvillaeales)

Gloria Collantes, Ana Merino & Verónica Lagos

 

Universidad de Valparaíso, Facultad de Ciencias del Mar. Casilla 13 – D, Viña del Mar, Chile

 

E-mail: gloria.collantes@uv.cl

 

Durvillaea antarctica has a life history similar to Fucales, characterized by lacking a free–living gametophyte generation and in having oogamous reproduction. Using techniques of light microscopy observations were made on phenology of gametogenesis, fertilization, maturity of conceptacles and embryogenesis of D. antarctica from Montemar cove, central Chile (32º 57`S – 71º 33`W). Degree of development of gametogenesis indicated maturity stages of conceptacles. Number of conceptacle layers indicated number of annual reproductive periods. During summer time, intertidal plants showed a vegetative or a rest period. From Autumn to early Spring, intertidal plants with one layer of conceptacles (98%), showed the gradual sequence of maturity and fertility periods. During Winter, drift fronds with 1 (61%), 2 (36%) and 3 (3%) layers of conceptacles showed different reproductive periods of maturity and fertility. Drift fronds seem to have components of subtidal fronds and further studies on reproductive phenology similar those undertaking in intertidal plants are needed. Life history information generated may well be applied to improve management and future culture of this resource. D. antarctica is an important Chilean resource having industrial potential.

 

Key words: Phenology, gametogenesis, maturity of conceptacles, fertility, embryogenesis

 

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1Laboratorio de Zooplancton, Instituto de Ciencias del Mar y Limnología,Universidad Nacional Autónoma de México. A. P. 70-305, 04510 México, D. F. México
 
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