Registro Completo
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
19/07/2012 |
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Data da última atualização: |
19/07/2012 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
-- - -- |
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Autoria: |
SCHERNER, F.; SOUZA, R. V.; BARUFI, J. B.; HORTA, P. A. |
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Afiliação: |
Epagri |
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Título: |
Salinity critical threshold values for photosynthesis of two cosmopolitan seaweed species: Providing baselines for potential shifts on seaweed assemblages. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Marine Environmental Research, p. 01-05, 2012. |
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Idioma: |
Inglês |
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Conteúdo: |
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. |
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Palavras-Chave: |
Climate change; Freshwater; Photosynthetic performance; Rainfall; Salinity; Sargassum stenophyllum; South America; Ulva lactuca. |
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Categoria do assunto: |
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Marc: |
LEADER 01687naa a2200217 a 4500
001 1086115
005 2012-07-19
008 2012 bl uuuu u00u1 u #d
100 1 $aEpagri
245 $aSalinity critical threshold values for photosynthesis of two cosmopolitan seaweed species$bProviding baselines for potential shifts on seaweed assemblages.
260 $c2012
520 $aClimate 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.
653 $aClimate change
653 $aFreshwater
653 $aPhotosynthetic performance
653 $aRainfall
653 $aSalinity
653 $aSargassum stenophyllum
653 $aSouth America
653 $aUlva lactuca
773 $tMarine Environmental Research, p. 01-05, 2012.
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