ISSN:
1573-5117
Keywords:
Chile
;
management
;
Rhodophyta
;
Sarcothalia
;
seaweed
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The present paper describes growth dynamics in a natural bed of the resource ‘luga negra’ (Sarcothalia crispata) in Guapilinao, southern Chile (41°57′ S, 73°31′ W). This resource is currently harvested and exported as raw material for the production of carrageenan. Seasonal variation in biomass, frond size, density and phenology was determined by periodic sampling. Natural recruitment was evaluated on different substrata added to the field; at the same time, substrata were inoculated under greenhouse conditions. Results showed that ‘luga negra’ has seasonal growth: biomass increased from a minimum in spring to a maximum in mid to late summer. On the other hand, density was minimal in winter (200 ind. m−2) and increased to 2000 ind. m−2 in late spring. Peak abundance of mature tetrasporic fronds occurred in late summer, whereas that of cystocarpic fronds occurred in winter. Recruitment began in summer and extended into winter. Survival on different substrata were compared. Gametophytes had better survival rates on clam shells and 5 mm rope while tetrasporophytes had the best survival rate on clam shells and secondarily on boulders.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00047814
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