Item


Lack of severe nutrient limitation in Caulerpa taxifolia (Vahl) C. Agardh, an introduced seaweed spreading over the oligotrophic Northwestern Mediterranean

We performed a seasonal study of the importance of nitrogen (N) and phosphorus (P) as limitation to the productivity of Caulerpa taxifolia (Vahl) C. Agardh, a seaweed invading the western Mediterranean coasts. The study presented here indicates that Caulerpa taxifolia did not respond to nutrient enrichment, except for plants collected in April and September 1993, where productivity and alkaline phosphatase activity (APA) of enriched plants varied 0.5- to 3-fold relative to those of control plants. Rates of APA ranged from 9 to 52 mu M PO4 odw h(-1), close to those characteristic of P-sufficient macroalgae. Tissue nutrient concentrations were frequently above typical critical levels for species of macroalgae ranging from 1.36 to 3.13% dw, and 0.16 to 0.21% dw, for N and P, respectively. Seasonal variation was moderate and not consistent. The lack of severe nutrient limitation in Mediterranean populations of Caulerpa taxifolia could be an important factor enabling it to outcompete native macrophytes

Walter de Gruyter

Author: Delgado, O.
Rodríguez Prieto, Concepció
Gacia, Esperança
Ballesteros i Segarra, Enric
Abstract: We performed a seasonal study of the importance of nitrogen (N) and phosphorus (P) as limitation to the productivity of Caulerpa taxifolia (Vahl) C. Agardh, a seaweed invading the western Mediterranean coasts. The study presented here indicates that Caulerpa taxifolia did not respond to nutrient enrichment, except for plants collected in April and September 1993, where productivity and alkaline phosphatase activity (APA) of enriched plants varied 0.5- to 3-fold relative to those of control plants. Rates of APA ranged from 9 to 52 mu M PO4 odw h(-1), close to those characteristic of P-sufficient macroalgae. Tissue nutrient concentrations were frequently above typical critical levels for species of macroalgae ranging from 1.36 to 3.13% dw, and 0.16 to 0.21% dw, for N and P, respectively. Seasonal variation was moderate and not consistent. The lack of severe nutrient limitation in Mediterranean populations of Caulerpa taxifolia could be an important factor enabling it to outcompete native macrophytes
Document access: http://hdl.handle.net/2072/295217
Language: eng
Publisher: Walter de Gruyter
Rights: Tots els drets reservats
Subject: Algues marines
Marine algae
Caulerpa
Plantes invasores
Invasive plants
Title: Lack of severe nutrient limitation in Caulerpa taxifolia (Vahl) C. Agardh, an introduced seaweed spreading over the oligotrophic Northwestern Mediterranean
Type: info:eu-repo/semantics/article
Repository: Recercat

Subjects

Authors


Warning: Unknown: write failed: No space left on device (28) in Unknown on line 0

Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/lib/php5) in Unknown on line 0