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
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T. Chopin
Abstract
The effects of phosphorus (P) and nitrogen (N) enrichments, and N:P ratios on nutrient and carrageenan contents in Chondrus crispus Stackhouse were investigated using a factorial block experiment design. After a variable preconditioning period until they were markedly depleted in P and N, plants were cultivated for 5 weeks in seawater enriched with different concentrations of P (0, 1.5, 3, 4.5, 6 μM wk−1) and N (12.5, 20, 40 μM wk−1). Tissue total P content increased significantly with P enrichment up to 4.5 μM wk−1. Variations in tissue total N content were more the reflection of seasonal variations of the initial nutrient content than due to experimental enrichment. Carrageenan production was optimized in the range of 20 μM N wk−1 and 1.5 to 3 μM P wk−1, and of 40 μM N wk−1 and 1.5 μM P wk−1, or higher, enrichments. No clear correlation was found between N:P ratio and carrageenan content. Dissolved inorganic N (DIN) in seawater remained low at all N and P enrichments; however, dissolved inorganic P (DIP) concentrations increased sharply at an enrichment of 4.5 μM P wk−1 and greater when algal tissues were becoming P saturated. Hence, determining the proper combinations of P and N enrichments, not N:P ratios, is of major importance for aquaculture systems for three reasons: 1) optimizing carrageenan production, 2) minimizing the direct cost of nutrients, and 3) minimizing the levels of DIP and DIN in effluents and, therefore, the indirect cost of nutrients due to their treatment to avoid excessive enrichment of coastal waters.
Copyright © 1999 by Walter de Gruyter GmbH & Co. KG
Articles in the same Issue
- 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)
Articles in the same Issue
- 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)
