Effects of UV on photo_synthesis of Antarctic phytoplankton: models and their application to coastal and pelagic assemblages Efecto de la radiaci6n UV sobre Ia fotosfntesis de fitoplancton antártico: modelos y su aplicaci6n a ensambles costeros y pelágico
ABSTRACT 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-ti...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1041.1409 2023-05-15T13:57:14+02:00 Effects of UV on photo_synthesis of Antarctic phytoplankton: models and their application to coastal and pelagic assemblages Efecto de la radiaci6n UV sobre Ia fotosfntesis de fitoplancton antártico: modelos y su aplicaci6n a ensambles costeros y pelágico The Pennsylvania State University CiteSeerX Archives http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1041.1409 en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1041.1409 Metadata may be used without restrictions as long as the oai identifier remains attached to it. text ftciteseerx 2020-03-08T01:24:42Z ABSTRACT 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, 6ao S, sao 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 (BWFE) 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 I a min were predicted to have generally less effect on Palmer phytoplankton than the WSC phytoplankton. Key words: Southern Ocean, primary productivity, ozone depletion, photosynthesis-irradiance curves, biological weighting functions. RESUMEN Se caracteriz6 Ia respuesta fotosintetica a radiaci6n ultravioleta (RUV) en poblaciones naturales de fitoplancton del Océano Antartico. Se midieron las funciones espectrales de peso bio16gico (BWFs) y curvas de inhibici6n de fotosfntesis en respuesta a Ia exposici6n de RUV durante Ia temporada de mayor disminuci6n de Ia ... Text Antarc* Antarctic Antarctic Peninsula antartic* Southern Ocean Unknown Antarctic Antarctic Peninsula Palmer Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) Palmer-Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) Southern Ocean The Antarctic Weddell |
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Open Polar |
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ftciteseerx |
language |
English |
description |
ABSTRACT 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, 6ao S, sao 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 (BWFE) 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 I a min were predicted to have generally less effect on Palmer phytoplankton than the WSC phytoplankton. Key words: Southern Ocean, primary productivity, ozone depletion, photosynthesis-irradiance curves, biological weighting functions. RESUMEN Se caracteriz6 Ia respuesta fotosintetica a radiaci6n ultravioleta (RUV) en poblaciones naturales de fitoplancton del Océano Antartico. Se midieron las funciones espectrales de peso bio16gico (BWFs) y curvas de inhibici6n de fotosfntesis en respuesta a Ia exposici6n de RUV durante Ia temporada de mayor disminuci6n de Ia ... |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
title |
Effects of UV on photo_synthesis of Antarctic phytoplankton: models and their application to coastal and pelagic assemblages Efecto de la radiaci6n UV sobre Ia fotosfntesis de fitoplancton antártico: modelos y su aplicaci6n a ensambles costeros y pelágico |
spellingShingle |
Effects of UV on photo_synthesis of Antarctic phytoplankton: models and their application to coastal and pelagic assemblages Efecto de la radiaci6n UV sobre Ia fotosfntesis de fitoplancton antártico: modelos y su aplicaci6n a ensambles costeros y pelágico |
title_short |
Effects of UV on photo_synthesis of Antarctic phytoplankton: models and their application to coastal and pelagic assemblages Efecto de la radiaci6n UV sobre Ia fotosfntesis de fitoplancton antártico: modelos y su aplicaci6n a ensambles costeros y pelágico |
title_full |
Effects of UV on photo_synthesis of Antarctic phytoplankton: models and their application to coastal and pelagic assemblages Efecto de la radiaci6n UV sobre Ia fotosfntesis de fitoplancton antártico: modelos y su aplicaci6n a ensambles costeros y pelágico |
title_fullStr |
Effects of UV on photo_synthesis of Antarctic phytoplankton: models and their application to coastal and pelagic assemblages Efecto de la radiaci6n UV sobre Ia fotosfntesis de fitoplancton antártico: modelos y su aplicaci6n a ensambles costeros y pelágico |
title_full_unstemmed |
Effects of UV on photo_synthesis of Antarctic phytoplankton: models and their application to coastal and pelagic assemblages Efecto de la radiaci6n UV sobre Ia fotosfntesis de fitoplancton antártico: modelos y su aplicaci6n a ensambles costeros y pelágico |
title_sort |
effects of uv on photo_synthesis of antarctic phytoplankton: models and their application to coastal and pelagic assemblages efecto de la radiaci6n uv sobre ia fotosfntesis de fitoplancton antártico: modelos y su aplicaci6n a ensambles costeros y pelágico |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1041.1409 |
long_lat |
ENVELOPE(-64.050,-64.050,-64.770,-64.770) ENVELOPE(-64.050,-64.050,-64.770,-64.770) |
geographic |
Antarctic Antarctic Peninsula Palmer Station Palmer-Station Southern Ocean The Antarctic Weddell |
geographic_facet |
Antarctic Antarctic Peninsula Palmer Station Palmer-Station Southern Ocean The Antarctic Weddell |
genre |
Antarc* Antarctic Antarctic Peninsula antartic* Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula antartic* Southern Ocean |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1041.1409 |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766264825372999680 |