Salinity critical threshold values for photosynthesis of two cosmopolitan seaweed species: Providing baselines for potential shifts on seaweed assemblages

Autor:	Fernando Scherner, José Bonomi Barufi, Robson Ventura, Paulo Antunes Horta
Rok vydání:	2013
Předmět:	Salinity Sargassum stenophyllum Climate Change Climate change Lactuca Aquatic Science Oceanography Photosynthesis Ulva Algae Fluorometry Precipitation biology Ecology Data Collection Sargassum Temperature Biodiversity General Medicine biology.organism_classification Pollution Ulva lactuca Seasons
Zdroj:	Marine Environmental Research. 91:14-25
ISSN:	0141-1136
DOI:	10.1016/j.marenvres.2012.05.007
Popis:	Climate change has increased precipitation in several South American regions leading to higher freshwater inputs into marine systems with potential to cause salinity declines along the coast. The current salinity profile on the southern coast of Brazil was surveyed during four years providing a baseline of the current salinity pattern in the region. Additionally, the effects of salinity decreases on the photosynthesis of the seaweeds Ulva lactuca and Sargassum stenophyllum were investigated in laboratory. Seaweeds were cultured at salinities 5, 15 and 34 and at the mean winter and summer temperatures. Photosynthetic performance was measured following 24 and 96 h from the beginning of experiment. U. lactuca remained practically unaltered by low salinities while S. stenophyllum presented declines of important photosynthetic parameters. This is due to the different regulation abilities of energy distribution at the PSII of the two species. These differences have potential to lead to seaweed community shifts.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3a06e08832b3efc9727c985ddd493d32 https://doi.org/10.1016/j.marenvres.2012.05.007 Zobrazit plný text záznamu Full Text from ScienceDirect