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Free Content Physiological Responses of Perennial Bases of Sargassum Filipendula from Three Sites on the West Coast of Florida

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Photosynthetic and respiratory responses of “dormant” perennial bases of three populations of Sargassum filipendula collected in 1.5-m, 3-m, and 9.5-m depths in the vicinity of Tampa Bay showed as broad or broader tolerances to 12 combinations of temperature and salinity and four irradiance levels when compared with the annual branches that develop from the bases during the summer and fall. The perennial bases and annual branches collected at each depth showed photoinhibition at similar irradiances (μE m–2s–1): 1.5 m, 800 and 900; 3.0 m, 200 and 250; 9.5 m, 300 and 350 respectively. The annual branches had similar (7.2 mg O2g dry wt–1h–1) or higher (11.7 mg O2g dry wt–1h–1) levels of productivity. The relationship of the perennial bases vs the annual branches with regard to the initial slope of the P-I curves, their compensation point (Ic) and saturation irradiances (Ik) suggest that each population was acclimated to seasonal changes specific to each site.

Document Type: Research Article

Publication date: March 1, 1988

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