Response of primary producers to the hydrographic variability in the southern region of the California Current System

The response of primary producers to seasonal and interannual variabilities in the hydrographic conditions observed between 1997 and 2012 is analyzed for the southern portion of the California Current System (CCS). The analysis uses the optimum rate of primary productivity (PP) normalized by units o...

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Autores principales: Cepeda-Morales, Jushiro, Durazo, Reginaldo, Millán-Núñez, Eduardo, De la Cruz-Orozco, Martín, Sosa-Ávalos, Ramon, Espinoza-Carreón, Teresa Leticia, Soto-Mardones, Luis, Gaxiola-Castro, Gilberto
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Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2017
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2752
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language eng
description The response of primary producers to seasonal and interannual variabilities in the hydrographic conditions observed between 1997 and 2012 is analyzed for the southern portion of the California Current System (CCS). The analysis uses the optimum rate of primary productivity (PP) normalized by units of chlorophyll (Chla) in the water column (PBopt) and Chla concentration. In situ PP estimations using the 14C method were obtained as part of the seasonal cruises conducted by the Investigaciones Mexicanas de la Corriente de California program. Supplementary data included sea surface temperature (SST) as measured by the AVHRR sensor from 1985–2009. We found the mean value of PBopt to be at 5.1 ± 3.3 mg C·(mg Chla)–1·h–1, with maximum ranges of 0.5 and 17.5 mg C·(mg Chla)–1·h–1. The relationship between PBopt and SST suggested a phytoplankton community change at around 19 ºC, which characterized the transitional nature of the southern portion of the CCS. SST data suggested, on the one hand, that on average the 19 ºC isotherm is located in the vicinity of Punta Eugenia and, on the other, that its spatial variability defined the alternating cool–warm conditions. At the seasonal scale, this isotherm showed a marked latitudinal displacement (from 24ºN to 32ºN), which was observed to be even out of this range during interannual events associated with El Niño/La Niña. Under both cool-warm hydrographic conditions, the phytoplanktonic community showed large PBopt rates (~6 mg C·(mg Chla)–1·h–1). At the interannual scale, changes were associated to changes in the abundance and composition of nano-microphytoplankton. Additionally, data suggested that high PP rates during warm periods could be attributed to an enhanced picoplankton contribution.
format info:eu-repo/semantics/article
author Cepeda-Morales, Jushiro
Durazo, Reginaldo
Millán-Núñez, Eduardo
De la Cruz-Orozco, Martín
Sosa-Ávalos, Ramon
Espinoza-Carreón, Teresa Leticia
Soto-Mardones, Luis
Gaxiola-Castro, Gilberto
spellingShingle Cepeda-Morales, Jushiro
Durazo, Reginaldo
Millán-Núñez, Eduardo
De la Cruz-Orozco, Martín
Sosa-Ávalos, Ramon
Espinoza-Carreón, Teresa Leticia
Soto-Mardones, Luis
Gaxiola-Castro, Gilberto
Response of primary producers to the hydrographic variability in the southern region of the California Current System
author_facet Cepeda-Morales, Jushiro
Durazo, Reginaldo
Millán-Núñez, Eduardo
De la Cruz-Orozco, Martín
Sosa-Ávalos, Ramon
Espinoza-Carreón, Teresa Leticia
Soto-Mardones, Luis
Gaxiola-Castro, Gilberto
author_sort Cepeda-Morales, Jushiro
title Response of primary producers to the hydrographic variability in the southern region of the California Current System
title_short Response of primary producers to the hydrographic variability in the southern region of the California Current System
title_full Response of primary producers to the hydrographic variability in the southern region of the California Current System
title_fullStr Response of primary producers to the hydrographic variability in the southern region of the California Current System
title_full_unstemmed Response of primary producers to the hydrographic variability in the southern region of the California Current System
title_sort response of primary producers to the hydrographic variability in the southern region of the california current system
publisher Iniversidad Autónoma de Baja California
publishDate 2017
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2752
_version_ 1792610215125843968
spelling repositorioinstitucional-20.500.12930-75252023-05-09T14:30:57Z Response of primary producers to the hydrographic variability in the southern region of the California Current System Respuesta de los productores primarios a la variabilidad hidrográfica en la región sur de la corriente de California Cepeda-Morales, Jushiro Durazo, Reginaldo Millán-Núñez, Eduardo De la Cruz-Orozco, Martín Sosa-Ávalos, Ramon Espinoza-Carreón, Teresa Leticia Soto-Mardones, Luis Gaxiola-Castro, Gilberto The response of primary producers to seasonal and interannual variabilities in the hydrographic conditions observed between 1997 and 2012 is analyzed for the southern portion of the California Current System (CCS). The analysis uses the optimum rate of primary productivity (PP) normalized by units of chlorophyll (Chla) in the water column (PBopt) and Chla concentration. In situ PP estimations using the 14C method were obtained as part of the seasonal cruises conducted by the Investigaciones Mexicanas de la Corriente de California program. Supplementary data included sea surface temperature (SST) as measured by the AVHRR sensor from 1985–2009. We found the mean value of PBopt to be at 5.1 ± 3.3 mg C·(mg Chla)–1·h–1, with maximum ranges of 0.5 and 17.5 mg C·(mg Chla)–1·h–1. The relationship between PBopt and SST suggested a phytoplankton community change at around 19 ºC, which characterized the transitional nature of the southern portion of the CCS. SST data suggested, on the one hand, that on average the 19 ºC isotherm is located in the vicinity of Punta Eugenia and, on the other, that its spatial variability defined the alternating cool–warm conditions. At the seasonal scale, this isotherm showed a marked latitudinal displacement (from 24ºN to 32ºN), which was observed to be even out of this range during interannual events associated with El Niño/La Niña. Under both cool-warm hydrographic conditions, the phytoplanktonic community showed large PBopt rates (~6 mg C·(mg Chla)–1·h–1). At the interannual scale, changes were associated to changes in the abundance and composition of nano-microphytoplankton. Additionally, data suggested that high PP rates during warm periods could be attributed to an enhanced picoplankton contribution. Se analizó la respuesta de los productores primarios a la variabilidad estacional e interanual de las condiciones hidrográficas en la región sur del Sistema de la Corriente de California (SCC) entre 1997 y 2012. El análisis se basa en la tasa óptima de productividad primaria (PP) normalizada por unidad de clorofila (Chla) en la columna de agua (PBopt) y en la concentración de Chla. Como parte del monitoreo que realiza el programa de Investigaciones Mexicanas de la Corriente de California, se obtuvieron para cada estación del año datos de PP in situ con la técnica de 14C. La información se complementó con datos de la temperatura superficial del mar (TSM) medida por el sensor AVHRR de 1985 a 2009. El análisis de los datos de TSM demostró que, en el promedio de largo periodo, la isoterma de 19 ºC se ubicó en las inmediaciones de punta Eugenia y que su variabilidad espacial permite seguir la alternancia del cambio entre las condiciones frías y cálidas. En la escala estacional, esta isoterma presentó un marcado desplazamiento latitudinal (de 24ºN a 32ºN), y se extiendió aún más durante eventos interanuales asociados a El Niño/La Niña. El valor promedio del PBopt fue de 5.1 ± 3.3 mg C·(mg Chla)–1·h–1 y varió de 0.5 a 17.5 mg C· (mg Chla)–1·h–1. La relación entre el PBopt y la TSM sugiere un cambio en la comunidad del fitoplancton a los 19 ºC, lo que se consideró como una respuesta al carácter transicional del SCC. La comunidad fitoplanctónica mantuvo altas tasas promedio de PBopt (~6 mg C·(mg Chla)–1·h–1) en ambas condiciones hidrográficas (frío/cálido). Las variaciones en la escala estacional e interanual del PBopt estuvieron asociados a cambios en la composición y abundancia del nano-microfitoplancton. Los datos sugieren que las altas tasas PP en periodos cálidos pueden atribuirse a la contribución del picoplancton. 2017-06-30 2021-06-03T03:55:34Z 2021-06-03T03:55:34Z 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/2752 10.7773/cm.v43i2.2752 https://hdl.handle.net/20.500.12930/7525 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2752/1650 Copyright (c) 2017 Ciencias Marinas application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 43 No. 2 (2017); 123-135 Ciencias Marinas; Vol. 43 Núm. 2 (2017); 123-135 2395-9053 0185-3880