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Salinity Stress, Nitrogen Competition, And Facilitation In Opportunistic Green Macroalgae.pdf

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Preview of Salinity Stress, Nitrogen Competition, and Facilitation in Opportunistic Green Macroalgae
🔗 Source: katboyerlab.org
📊 Size: 1.35 MB
📄 Pages: 19 pages
⬇️ Downloads: 29

Summary

The study investigates the factors controlling seasonal succession of two opportunistic green macroalgae, Enteromorpha intestinalis and Ulva expansa, in southern California estuaries and lagoons. Key findings include:

1. Salinity Tolerance: Both algae are negatively affected by low salinity, but E. intestinalis favors salinities of 15 ppt, while U. expansa prefers oceanic salinity (35 ppt) when nitrogen is abundant. Neither has a clear advantage at 25 ppt.

2. Nitrogen Competition: When nitrogen is scarce, both algae compete directly for nutrients. E. intestinalis outcompetes U. expansa in direct competition, negatively affecting its growth.

3. Facilitation: U. expansa facilitates the growth of E. intestinalis when nitrogen is scarce, possibly by releasing dissolved organic nitrogen (DON) that E. intestinalis can assimilate.

The authors hypothesize that U. expansa may facilitate the dominance of E. intestinalis by leaking nitrogen that E. intestinalis can use. They suggest that E. intestinalis would dominate immediately after rain, but U. expansa would take over when nitrogen becomes available and tidal action restores oceanic salinity. However, at the end of the rainy season when nitrogen is scarce, E. intestinalis would outcompete U. expansa.

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Description

Study investigates factors driving seasonal succession of two green macroalgae (Enteromorpha intestinalis and Ulva expansa) in southern California estuaries and lagoons. Key factors include differential salinity tolerance, nitrogen competition, and facilitation through altered nitrogen supply.

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  • File Format: PDF
  • File Size: 1.35 MB
  • Pages: 19
  • Language: EN
  • Total Downloads: 29
  • Last Updated: 3 weeks ago

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Salinity guideSalinity tutorialStress, guideStress, tutorialNitrogen guideNitrogen tutorialCompetition, guideCompetition, tutorialFacilitation guideFacilitation tutorialOpportunistic guideOpportunistic tutorialGreen guideGreen tutorialMacroalgae guideMacroalgae tutorial

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