Diatom blooms and primary production in a channel ecosystem of central Patagonia

Abstract Here we report on the seasonal productivity cycle at a fixed station in the Puyuhuapi Channel (44°S, 73°W), Chilean Patagonia. The analysis of in situ water column data and longer-term records of satellite-derived surface ocean color (Chl-a) highlighted two contrasting seasons. A more produ...

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Autores principales:	Montero,Paulina, Daneri,Giovanni, Tapia,Fabián, Iriarte,Jose Luis, Crawford,David
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2017
Materias:	primary production diatom blooms channels ecosystem Chilean fjords
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2017000500999
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spelling	oai:scielo:S0718-560X20170005009992017-12-07Diatom blooms and primary production in a channel ecosystem of central PatagoniaMontero,PaulinaDaneri,GiovanniTapia,FabiánIriarte,Jose LuisCrawford,David primary production diatom blooms channels ecosystem Chilean fjords Abstract Here we report on the seasonal productivity cycle at a fixed station in the Puyuhuapi Channel (44°S, 73°W), Chilean Patagonia. The analysis of in situ water column data and longer-term records of satellite-derived surface ocean color (Chl-a) highlighted two contrasting seasons. A more productive period occurred between August and April, where depth-integrated gross primary production (GPP) estimates ranged from 0.1 to 2.9 g C m−2 d−1, and a shorter, less-productive season lasted from May to July with GPP ranging from 0.03 to 0.3 g C m−2 d−1. Diatoms of the genera Pseudo-nitzschia, Skeletonema and Chaetoceros dominated the phytoplankton, and showed a pronounced seasonality greatly influenced by prevailing environmental conditions. Warmer waters were associated with high concentrations of Pseudo-nitzschia spp., while high abundances of Skeletonema spp. and Chaetoceros spp. were associated with fresher silicate-rich waters. A marked Skeletonema spp. bloom characterized the onset of the productive season in August 2008, and with some exceptions, the highest levels of GPP (1.5 to 2.9 g C m−2 d−1) were measured when Skeletonema dominated the phytoplankton community. Reduced production (low GPP) was observed during periods of increased discharge from the Cisnes River, whereas the “spring” diatom bloom (or late winter bloom in Puyuhuapi Channel) observed during August 2008 coincided with a ~50% drop in the freshwater discharge. We therefore suggest that periods of intensive freshwater Input, that increase the silicic acid concentrations in the upper layers, provide ideal growing conditions for diatoms as the freshwater flow subsequently recedes. Principal component analysis (PCA) suggests that a decrease in salinity, increase in silicic acid concentration, and growth of Skeletonema spp. and Chaetoceros spp., are probably key factors in the annual cycle of GPP in Puyuhuapi Channel.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.45 n.5 20172017-11-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2017000500999en10.3856/vol45-issue5-fulltext-16
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	primary production diatom blooms channels ecosystem Chilean fjords
spellingShingle	primary production diatom blooms channels ecosystem Chilean fjords Montero,Paulina Daneri,Giovanni Tapia,Fabián Iriarte,Jose Luis Crawford,David Diatom blooms and primary production in a channel ecosystem of central Patagonia
description	Abstract Here we report on the seasonal productivity cycle at a fixed station in the Puyuhuapi Channel (44°S, 73°W), Chilean Patagonia. The analysis of in situ water column data and longer-term records of satellite-derived surface ocean color (Chl-a) highlighted two contrasting seasons. A more productive period occurred between August and April, where depth-integrated gross primary production (GPP) estimates ranged from 0.1 to 2.9 g C m−2 d−1, and a shorter, less-productive season lasted from May to July with GPP ranging from 0.03 to 0.3 g C m−2 d−1. Diatoms of the genera Pseudo-nitzschia, Skeletonema and Chaetoceros dominated the phytoplankton, and showed a pronounced seasonality greatly influenced by prevailing environmental conditions. Warmer waters were associated with high concentrations of Pseudo-nitzschia spp., while high abundances of Skeletonema spp. and Chaetoceros spp. were associated with fresher silicate-rich waters. A marked Skeletonema spp. bloom characterized the onset of the productive season in August 2008, and with some exceptions, the highest levels of GPP (1.5 to 2.9 g C m−2 d−1) were measured when Skeletonema dominated the phytoplankton community. Reduced production (low GPP) was observed during periods of increased discharge from the Cisnes River, whereas the “spring” diatom bloom (or late winter bloom in Puyuhuapi Channel) observed during August 2008 coincided with a ~50% drop in the freshwater discharge. We therefore suggest that periods of intensive freshwater Input, that increase the silicic acid concentrations in the upper layers, provide ideal growing conditions for diatoms as the freshwater flow subsequently recedes. Principal component analysis (PCA) suggests that a decrease in salinity, increase in silicic acid concentration, and growth of Skeletonema spp. and Chaetoceros spp., are probably key factors in the annual cycle of GPP in Puyuhuapi Channel.
author	Montero,Paulina Daneri,Giovanni Tapia,Fabián Iriarte,Jose Luis Crawford,David
author_facet	Montero,Paulina Daneri,Giovanni Tapia,Fabián Iriarte,Jose Luis Crawford,David
author_sort	Montero,Paulina
title	Diatom blooms and primary production in a channel ecosystem of central Patagonia
title_short	Diatom blooms and primary production in a channel ecosystem of central Patagonia
title_full	Diatom blooms and primary production in a channel ecosystem of central Patagonia
title_fullStr	Diatom blooms and primary production in a channel ecosystem of central Patagonia
title_full_unstemmed	Diatom blooms and primary production in a channel ecosystem of central Patagonia
title_sort	diatom blooms and primary production in a channel ecosystem of central patagonia
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2017
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2017000500999
work_keys_str_mv	AT monteropaulina diatombloomsandprimaryproductioninachannelecosystemofcentralpatagonia AT danerigiovanni diatombloomsandprimaryproductioninachannelecosystemofcentralpatagonia AT tapiafabian diatombloomsandprimaryproductioninachannelecosystemofcentralpatagonia AT iriartejoseluis diatombloomsandprimaryproductioninachannelecosystemofcentralpatagonia AT crawforddavid diatombloomsandprimaryproductioninachannelecosystemofcentralpatagonia
_version_	1714205191578845184

Diatom blooms and primary production in a channel ecosystem of central Patagonia

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