The Introduced Alga Undaria pinnatifida (Laminariales, Alariaceae) in the Rocky Shore Ecosystem of the St Malo Area: Growth Rate and Longevity of the Sporophyte
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A. Castric-Fey
Abstract
As a result of the deliberate introduction of Undaria pinnatifida (Harvey) Suringar into the Rance Estuary for aquaculture purposes, this kelp has now established itself naturally in the coastal area around St Malo. A population of U. pinnatifida in the Dinard area was subjected to a monthly monitoring programme, conducted in the lower eulittoral zone during low water of Spring tides. Tagging of thalli and punching of holes on the blades were methods used to estimate growth rate. Five parameters were measured: total length, stipe length, midrib width, sporophyll number and sporophyll width. During the 20 months of this study, 4 series of thalli (two per year) developed successively, in spring and autumn. Thalli appeared throughout the year, although very few were present during a period of three weeks, from the end of August to mid-September. Maximal daily growth rates occurred in March–April (21 mm/day) for spring thalli appearing from January to March, and in November (18 mm/day) for those appearing in October. The highest growth rate was observed both in the spring rise and autumnal fall of temperature and illumination. Thalli that appeared in autumn and winter produced the widest sporophylls. Thalli that appeared in spring and early summer gave rise to sporophylls less wide but more numerous. The maximal life-span noted in the field was 222 days (about 7.5 months); but most had a life-span of about 6 months. Maximal size observed was 1.90 m, with 1.470 g wet weight and 190 g dry weight.
Copyright © 1999 by Walter de Gruyter GmbH & Co. KG
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Artikel in diesem Heft
- Studies on the Fatty Acids of the Red Alga Chondria armata (Kütz.) Okamura
- First Report of the Genus Sorocarpus Pringsheim (Fucophyceae, Ectocarpaceae) in the Mediterranean
- Light-Induced Photoinhibitory Stress Reponses of Laboratory-Cultured Halophila ovalis
- Factorial Study of the Effects of Phosphorus and Nitrogen Enrichments on Nutrient and Carrageenan Content in Chondrus crispus (Rhodophyceae) and on Residual Nutrient Concentration in Seawater
- First Record of Haloguignardia cystoseira (Ascomycota) Parasitic on Cystoseira elegans (Fucophyceae) from the Mediterranean Sea
- Pseudogrinnellia barrattiae gen. et sp. nov., a New Member of the Red Algal Family Delesseriacea from the Sultanate of Oman
- Seasonal Dynamics of Growth in the Barents Sea Seaweeds: Endogenous and Exogenous Regulation
- Agars from Three Fijian Gracilaria Species
- New Collections of Benthic Marine Algae from Livingston and Deception Islands (South Shetland Islands) and Trinity Island (Bransfield Strait) Antarctica
- The Introduced Alga Undaria pinnatifida (Laminariales, Alariaceae) in the Rocky Shore Ecosystem of the St Malo Area: Morphology and Growth of the Sporophyte
- The Introduced Alga Undaria pinnatifida (Laminariales, Alariaceae) in the Rocky Shore Ecosystem of the St Malo Area: Growth Rate and Longevity of the Sporophyte
- Leaf Dynamics and Shoot Production of the Seagrass Thalassia testudinum in the Indian River Lagoon (Florida)
