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The green tide-forming macroalga Ulva linza outcompetes the red macroalga Gracilaria lemaneiformis via allelopathy and fast nutrients uptake

The green tide-forming macroalga Ulva linza outcompetes the red macroalga Gracilaria... The objective of this study was to evaluate the interactions between green tide-forming macroalgae Ulva linza and red macroalgae Gracilaria lemaneiformis in the laboratory. The results demonstrated that the presence of U. linza can restrict growth (9–31 %) and photosynthesis (25–85 %) of G. lemaneiformis. In contrast, G. lemaneiformis had little apparent effect on the growth of U. linza. Culture medium experiments confirmed that allelochemicals may be released by both the tested macroalgae. The causative mechanism for the growth and photosynthesis inhibition of G. lemaneiformis was not light limitation nor increase of pH, but a combination of allelopathic effects of U. linza and nutrient competition between the two macroalgae. Moreover, the “green tide” macroalga U. linza was a stronger competitor for nutrient than G. lemaneiformis. The results from this study provide evidence for the mechanisms of “green tide” formation by U. linza: potent allelopathic effects on G. lemaneiformis and faster nutrients uptake than its competitors. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aquatic Ecology Springer Journals

The green tide-forming macroalga Ulva linza outcompetes the red macroalga Gracilaria lemaneiformis via allelopathy and fast nutrients uptake

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References (37)

Publisher
Springer Journals
Copyright
Copyright © 2013 by Springer Science+Business Media Dordrecht
Subject
Life Sciences; Freshwater & Marine Ecology; Ecosystems
ISSN
1386-2588
eISSN
1573-5125
DOI
10.1007/s10452-013-9465-9
Publisher site
See Article on Publisher Site

Abstract

The objective of this study was to evaluate the interactions between green tide-forming macroalgae Ulva linza and red macroalgae Gracilaria lemaneiformis in the laboratory. The results demonstrated that the presence of U. linza can restrict growth (9–31 %) and photosynthesis (25–85 %) of G. lemaneiformis. In contrast, G. lemaneiformis had little apparent effect on the growth of U. linza. Culture medium experiments confirmed that allelochemicals may be released by both the tested macroalgae. The causative mechanism for the growth and photosynthesis inhibition of G. lemaneiformis was not light limitation nor increase of pH, but a combination of allelopathic effects of U. linza and nutrient competition between the two macroalgae. Moreover, the “green tide” macroalga U. linza was a stronger competitor for nutrient than G. lemaneiformis. The results from this study provide evidence for the mechanisms of “green tide” formation by U. linza: potent allelopathic effects on G. lemaneiformis and faster nutrients uptake than its competitors.

Journal

Aquatic EcologySpringer Journals

Published: Nov 22, 2013

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