Effects of UV on photosynthesis of Antarctic phytoplankton: models and their application to coastal and pelagic assemblages

We have characterized the photosynthetic response to ultraviolet radiation (UV) of natural phytoplankton assemblages in Antarctic (Southern Ocean) waters. Biological weighting functions (BWFs) and exposure response curves for inhibition of photosynthesis by UV were measured during spring-time ozone...

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Autores principales:	NEALE,PATRICK J., FRITZ,JENNIFER J., DAVIS,RICHARD F.
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2001
Materias:	Southern Ocean primary productivity ozone depletion photosynthesis-irradiance curves biological weighting functions
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200006
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spelling	oai:scielo:S0716-078X20010002000062001-11-08Effects of UV on photosynthesis of Antarctic phytoplankton: models and their application to coastal and pelagic assemblagesNEALE,PATRICK J.FRITZ,JENNIFER J.DAVIS,RICHARD F. Southern Ocean primary productivity ozone depletion photosynthesis-irradiance curves biological weighting functions We have characterized the photosynthetic response to ultraviolet radiation (UV) of natural phytoplankton assemblages in Antarctic (Southern Ocean) waters. Biological weighting functions (BWFs) and exposure response curves for inhibition of photosynthesis by UV were measured during spring-time ozone depletion (October-November). Two different models were developed to relate photosynthesis to UV exposure. A model that is a function of the duration of exposure (BWF H) applied to assemblages in the well-mixed open waters of the Weddell-Scotia Confluence (WSC, 60° S, 50° W), since responses were a function of cumulative exposure and recovery rates were slow. These assemblages had a variable but generally high sensitivity to UV. A steady-state model (BWF E) applied in the shallow waters near the Antarctic Peninsula (Palmer Station, 64° S, 64° W), where inhibition was a function of irradiance (reciprocity failed), and recovery was rapid. Using information on the time-dependence of photosynthesis in assemblages with active repair, inferences were drawn on the relative contribution of damage and recovery processes to the UV weights. BWFs for Palmer phytoplankton sampled during periods of pack-ice cover had both higher damage and higher repair than BWFs for WSC assemblages. BWFs for Palmer phytoplankton sampled during open water periods had about the same damage weights as Weddell-Scotia assemblages but had a higher repair rate. Solar exposures of more than 10 min were predicted to have generally less effect on Palmer phytoplankton than the WSC phytoplanktoninfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.74 n.2 20012001-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200006en10.4067/S0716-078X2001000200006
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Southern Ocean primary productivity ozone depletion photosynthesis-irradiance curves biological weighting functions
spellingShingle	Southern Ocean primary productivity ozone depletion photosynthesis-irradiance curves biological weighting functions NEALE,PATRICK J. FRITZ,JENNIFER J. DAVIS,RICHARD F. Effects of UV on photosynthesis of Antarctic phytoplankton: models and their application to coastal and pelagic assemblages
description	We have characterized the photosynthetic response to ultraviolet radiation (UV) of natural phytoplankton assemblages in Antarctic (Southern Ocean) waters. Biological weighting functions (BWFs) and exposure response curves for inhibition of photosynthesis by UV were measured during spring-time ozone depletion (October-November). Two different models were developed to relate photosynthesis to UV exposure. A model that is a function of the duration of exposure (BWF H) applied to assemblages in the well-mixed open waters of the Weddell-Scotia Confluence (WSC, 60° S, 50° W), since responses were a function of cumulative exposure and recovery rates were slow. These assemblages had a variable but generally high sensitivity to UV. A steady-state model (BWF E) applied in the shallow waters near the Antarctic Peninsula (Palmer Station, 64° S, 64° W), where inhibition was a function of irradiance (reciprocity failed), and recovery was rapid. Using information on the time-dependence of photosynthesis in assemblages with active repair, inferences were drawn on the relative contribution of damage and recovery processes to the UV weights. BWFs for Palmer phytoplankton sampled during periods of pack-ice cover had both higher damage and higher repair than BWFs for WSC assemblages. BWFs for Palmer phytoplankton sampled during open water periods had about the same damage weights as Weddell-Scotia assemblages but had a higher repair rate. Solar exposures of more than 10 min were predicted to have generally less effect on Palmer phytoplankton than the WSC phytoplankton
author	NEALE,PATRICK J. FRITZ,JENNIFER J. DAVIS,RICHARD F.
author_facet	NEALE,PATRICK J. FRITZ,JENNIFER J. DAVIS,RICHARD F.
author_sort	NEALE,PATRICK J.
title	Effects of UV on photosynthesis of Antarctic phytoplankton: models and their application to coastal and pelagic assemblages
title_short	Effects of UV on photosynthesis of Antarctic phytoplankton: models and their application to coastal and pelagic assemblages
title_full	Effects of UV on photosynthesis of Antarctic phytoplankton: models and their application to coastal and pelagic assemblages
title_fullStr	Effects of UV on photosynthesis of Antarctic phytoplankton: models and their application to coastal and pelagic assemblages
title_full_unstemmed	Effects of UV on photosynthesis of Antarctic phytoplankton: models and their application to coastal and pelagic assemblages
title_sort	effects of uv on photosynthesis of antarctic phytoplankton: models and their application to coastal and pelagic assemblages
publisher	Sociedad de Biología de Chile
publishDate	2001
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200006
work_keys_str_mv	AT nealepatrickj effectsofuvonphotosynthesisofantarcticphytoplanktonmodelsandtheirapplicationtocoastalandpelagicassemblages AT fritzjenniferj effectsofuvonphotosynthesisofantarcticphytoplanktonmodelsandtheirapplicationtocoastalandpelagicassemblages AT davisrichardf effectsofuvonphotosynthesisofantarcticphytoplanktonmodelsandtheirapplicationtocoastalandpelagicassemblages
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Effects of UV on photosynthesis of Antarctic phytoplankton: models and their application to coastal and pelagic assemblages

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