Temporal and spatial distribution of transparent exopolymer particles off the northern coast of Baja California, Mexico

Temporal and spatial distribution of transparent exopolymer particles off the northern coast of Baja California, Mexico

Transparent exopolymer particles (TEP) have been reported as a significant fraction of organic microgels in different oceans. No TEP data have been published for the California Current region off Baja California that indicate the potential contribution of this reservoir to the carbon budget. We meas...

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Glavni autori: Hakspiel-Segura, Cristian, Cajal-Medrano, Ramón, Maske-Rubach, Helmut, Villegas-Mendoza, Josué
Format: info:eu-repo/semantics/article
Jezik:eng
Izdano: Iniversidad Autónoma de Baja California 2017
Online pristup:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2732
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description Transparent exopolymer particles (TEP) have been reported as a significant fraction of organic microgels in different oceans. No TEP data have been published for the California Current region off Baja California that indicate the potential contribution of this reservoir to the carbon budget. We measured TEP in seawater samples, using the spectrophotometric method with alcian blue stain, and additional environmental and biological variables during 3 seasons at coastal stations between ~1.4 and 12.0 mi offshore, near 31ºN. Concentrations of TEP obtained with 0.45 µm pore size filters showed spatial and temporal distributions with a tendency to increase from offshore to nearshore and from winter to summer, respectively, ranging from undetectable values to 7.18 µg XG eq·mL–1 (median: 0.70). A significant positive correlation was observed between the concentration of TEP and bacterioplankton abundance (P < 0.05), and between total organic carbon and bacterioplankton abundance (P < 0.05). Transparent exopolymer particles also presented a negative correlation with community respiration (P < 0.05), suggesting that TEP provided a physical substrate for settlement of prokaryotic microorganisms but probably did not supply labile carbon. We compared the concentration of alcian blue stainable particles retained by the standard 0.45 µm pore size with the concentration obtained with 0.22 µm filters; the latter showed 1.7 to 64.0 fold (median: 4.1) higher TEP concentrations. This strong dependence of TEP concentration on pore size makes it difficult to define the quantitative contribution of TEP and their precursors to particulate organic matter and their role in the carbon cycle. Further studies on TEP in the Mexican portion of the California Current must corroborate the observed spatial and seasonal trends, and estimate a TEP-to-carbon conversion factor that provides a better approximation to its contribution to the regional carbon budget. 
format info:eu-repo/semantics/article
author Hakspiel-Segura, Cristian
Cajal-Medrano, Ramón
Maske-Rubach, Helmut
Villegas-Mendoza, Josué
spellingShingle Hakspiel-Segura, Cristian
Cajal-Medrano, Ramón
Maske-Rubach, Helmut
Villegas-Mendoza, Josué
Temporal and spatial distribution of transparent exopolymer particles off the northern coast of Baja California, Mexico
author_facet Hakspiel-Segura, Cristian
Cajal-Medrano, Ramón
Maske-Rubach, Helmut
Villegas-Mendoza, Josué
author_sort Hakspiel-Segura, Cristian
title Temporal and spatial distribution of transparent exopolymer particles off the northern coast of Baja California, Mexico
title_short Temporal and spatial distribution of transparent exopolymer particles off the northern coast of Baja California, Mexico
title_full Temporal and spatial distribution of transparent exopolymer particles off the northern coast of Baja California, Mexico
title_fullStr Temporal and spatial distribution of transparent exopolymer particles off the northern coast of Baja California, Mexico
title_full_unstemmed Temporal and spatial distribution of transparent exopolymer particles off the northern coast of Baja California, Mexico
title_sort temporal and spatial distribution of transparent exopolymer particles off the northern coast of baja california, mexico
publisher Iniversidad Autónoma de Baja California
publishDate 2017
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2732
_version_ 1792610214665519104
spelling repositorioinstitucional-20.500.12930-75202023-05-09T14:30:57Z Temporal and spatial distribution of transparent exopolymer particles off the northern coast of Baja California, Mexico Distribución temporal y espacial de partículas de exopolímeros transparentes frente a la costa norte de Baja California, México Hakspiel-Segura, Cristian Cajal-Medrano, Ramón Maske-Rubach, Helmut Villegas-Mendoza, Josué Transparent exopolymer particles (TEP) have been reported as a significant fraction of organic microgels in different oceans. No TEP data have been published for the California Current region off Baja California that indicate the potential contribution of this reservoir to the carbon budget. We measured TEP in seawater samples, using the spectrophotometric method with alcian blue stain, and additional environmental and biological variables during 3 seasons at coastal stations between ~1.4 and 12.0 mi offshore, near 31ºN. Concentrations of TEP obtained with 0.45 µm pore size filters showed spatial and temporal distributions with a tendency to increase from offshore to nearshore and from winter to summer, respectively, ranging from undetectable values to 7.18 µg XG eq·mL–1 (median: 0.70). A significant positive correlation was observed between the concentration of TEP and bacterioplankton abundance (P < 0.05), and between total organic carbon and bacterioplankton abundance (P < 0.05). Transparent exopolymer particles also presented a negative correlation with community respiration (P < 0.05), suggesting that TEP provided a physical substrate for settlement of prokaryotic microorganisms but probably did not supply labile carbon. We compared the concentration of alcian blue stainable particles retained by the standard 0.45 µm pore size with the concentration obtained with 0.22 µm filters; the latter showed 1.7 to 64.0 fold (median: 4.1) higher TEP concentrations. This strong dependence of TEP concentration on pore size makes it difficult to define the quantitative contribution of TEP and their precursors to particulate organic matter and their role in the carbon cycle. Further studies on TEP in the Mexican portion of the California Current must corroborate the observed spatial and seasonal trends, and estimate a TEP-to-carbon conversion factor that provides a better approximation to its contribution to the regional carbon budget.  Las partículas de exopolímeros transparentes (PET) constituyen una fracción significativa de los microgeles orgánicos en diferentes océanos. Para la corriente de California frente a Baja California, aún no existen datos de PET publicados que indiquen la contribución potencial de esta reserva al presupuesto de carbono. Se midieron las PET en muestras de agua de mar, usando el método espectrofotométrico con tinción de azul alcián, así como variables ambientales y biológicas en estaciones costeras cercanas a 31ºN, entre ~1.4 y 12.0 mi de la costa, durante 3 temporadas. Las concentraciones de PET obtenidas con membranas de tamaño de poro de 0.45 µm presentaron distribución espacial y distribución temporal con una tendencia a incrementar del océano a la costa, y de invierno a verano, respectivamente, y fluctuaron desde niveles indetectables hasta 7.18 µg XG eq·mL–1 (mediana: 0.70). Se observó una correlación positiva significativa entre la concentración de PET y la abundancia de bacterioplancton (P < 0.05), y entre el carbono orgánico total y el bacterioplancton (P < 0.05). Las PET presentaron una correlación negativa con la respiración comunitaria (P < 0.05), lo cual sugiere que la materia orgánica de las PET funciona como sustrato físico para el asentamiento de microorganismos procarióticos y no como suplemento de carbono lábil. Se comparó la concentración de partículas teñidas con azul alcián retenidas por el tamaño de poro operativo de 0.45 µm con la obtenida con filtros de 0.22 µm, esta última entre 1.7 y 64.0 veces (mediana: 4.1) mayor. Esta fuerte dependencia de la concentración de PET al tamaño de poro dificulta definir la contribución cuantitativa de PET y sus precursores a la materia orgánica particulada, y su papel en el ciclo del carbono. Otros estudios sobre las PET en la parte mexicana de la corriente de California deben corroborar las tendencias espaciotemporales que fueron observadas, así como ponderar un factor de conversión a carbono que provea una mejor aproximación de su contribución al presupuesto de carbono. 2017-12-22 2021-06-03T03:55:33Z 2021-06-03T03:55:33Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2732 10.7773/cm.v43i4.2732 https://hdl.handle.net/20.500.12930/7520 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2732/1947 Copyright (c) 2017 Ciencias Marinas application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 43 No. 4 (2017); 249–267 Ciencias Marinas; Vol. 43 Núm. 4 (2017); 249–267 2395-9053 0185-3880

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