Variability of marine biological productivity in the northeastern Pacific over the past millennium

Juárez, Miryam; Sánchez, Alberto; González-Yajimovich, Oscar

doi:10.7773/cm.v40i4.2477

Cited by 5 publications

(13 citation statements)

References 31 publications

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“…La variabilidad de la productividad primaria en el Pacífico nororiental se asocia al cambio en las condiciones fisicoquímicas de la columna de agua, que son moduladas interanualmente durante los eventos El Niño y La Niña (Juárez et al 2014). Los sedimentos laminados de esta cuenca indicaron un aumento en la abundancia de especies de dinoflagelados heterotróficos durante los intervalos de tiempo con fase fría de la ODP y de ENOS en el siglo XX (Castañeda-Quezada 2016).…”

Section: Productividad Primariaunclassified

“…Variability in primary productivity in the northeastern Pacific Ocean is associated with changes in the physicochemical conditions in the water column, which undergo interannual modulations during El Niño and La Niña events (Juárez et al 2014). Laminated sediments in this basin indicated an increase in the abundance of heterotrophic dinoflagellate species during the cold phases of the PDO and ENSO in the 20th century (Castañeda-Quezada 2016).…”

Section: Primary Productivitymentioning

confidence: 99%

“…La baja productividad del siglo XIX en la región también ha sido detectada como valores bajos en el porcentaje de ópalo biogénico (Juárez et al 2014). Esta disminución en la productividad de diatomeas implica un debilitamiento de las surgencias y/o una disminución en el suministro de nutrientes (Barron et al 2013, Bringué et al 2014, Juárez et al 2014. Se ha demostrado que en el Pacífico nororiental ocurre una alternancia en la dominancia del plancton, del calcáreo al opalino, y este último es dominante en periodos de surgencia, cuando la producción de carbonatos es baja (Juárez et al 2015).…”

Section: Primary Productivity and Sea Surface Temperatureunclassified

“…The low productivity in the region in the 19th century has also been detected as low percentage values of biogenic opal (Juárez et al 2014). This decline in diatom productivity implies that upwelling weakened and/or nutrient input decreased (Barron et al 2013, Bringué et al 2014, Juárez et al 2014. The dominance of planktonic groups in the northeastern Pacific has been shown to alternate between calcareous and opaline forms, the latter being dominant during upwelling periods, when carbonate production is low (Juárez et al 2015).…”

Section: Primary Productivity and Sea Surface Temperaturementioning

confidence: 99%

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Paleoceanographic and paleoclimatic reconstruction based on marine palynomorphs in the period 1811–1907 CE in the Magdalena Basin, Baja California Sur, Mexico

López-Velázquez¹,

Helenes²,

Flores-Trujillo³

et al. 2019

Cienc. Mar.

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A. Biennial variations of marine palynomorph concentrations mirrored oceanographic conditions in the Magdalena Basin, Baja California Sur (Mexico), in the period from 1811 to 1907 (common era, CE), for which the sea surface temperature index (SSTI) showed predominantly negative anomalies. We analyzed 49 samples of laminated sediments taken from a core extracted at a water depth of 520 m. Changes in dinoflagellate assemblages and copepod egg abundances were compared to SSTI records and to El Niño Southern Oscillation (ENSO) and Pacific Decadal Oscillation (PDO) reconstructions. Copepods were the most abundant and showed a significant correlation with SSTI. Among the dinoflagellates, heterotrophs were the most abundant and did not correlate with SSTI. The lowest concentration of autotrophs showed a significant and inverse correlation with SSTI. The canonical correlation analysis also indicated that copepods and autotrophs were modulated by variations in SSTI. Dinoflagellate richness and concentrations and copepod egg concentrations were low, indicating low productivity, and these values coincided with the negative SSTI anomalies. In contrast, the increase in concentrations from 1881 to 1907 CE coincided with positive SSTI anomalies. Also, even when marine palynomorphs showed no significant correlation with either ENSO or PDO, their concentrations increased during age intervals with combined negative conditions (La Niña, negative PDO) and decreased during combined warm conditions (El Niño, positive PDO). R . Las variaciones bianuales de las concentraciones de palinomorfos marinos reflejaron las condiciones oceanográficas en la cuencaMagdalena, Baja California Sur (México), en el periodo de 1811 a 1907 (era común, EC), para el cual el índice de la temperatura superficial del mar (ITSM) demostró, predominantemente, anomalías negativas. Se analizaron 49 muestras de sedimentos laminados tomadas de un núcleo extraído a 520 m de profundidad del agua. Los cambios observados en los conjuntos de quistes de dinoflagelados y las abundancias de huevos de copépodos fueron comparadas con registros del ITSM y reconstrucciones de El Niño Oscilación del Sur (ENOS) y la Oscilación Decenal del Pacífico (ODP). Los copépodos fueron los más abundantes y presentaron una correlación significativa con el ITSM. Entre los dinoflagelados, los heterótrofos fueron los más abundantes y no se correlacionaron con el ITSM. La concentración más baja de autótrofos mostró una correlación significativa e inversa con el ITSM. El análisis de correlación canónica también indicó que las abundancias de copépodos y autótrofos estuvieron modulados por las variaciones del ITSM. La riqueza y la concentración de dinoflagelados, así como las concentraciones de huevos de copépodos, fueron bajas, indicativo de baja productividad, y coincidieron con las anomalías negativas del ITSM. En contraste, se observó un incremento en las concentraciones de 1881 a 1907 EC, correspondiente a un aumento del ITSM. Además, aunque los palinomorfos marinos no mostraron una correlació...

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Section: Productividad Primariaunclassified

Section: Primary Productivitymentioning

confidence: 99%

Section: Primary Productivity and Sea Surface Temperatureunclassified

Section: Primary Productivity and Sea Surface Temperaturementioning

confidence: 99%

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Paleoceanographic and paleoclimatic reconstruction based on marine palynomorphs in the period 1811–1907 CE in the Magdalena Basin, Baja California Sur, Mexico

López-Velázquez¹,

Helenes²,

Flores-Trujillo³

et al. 2019

Cienc. Mar.

View full text Add to dashboard Cite

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“…Mann et al, 2009) has been related to the lowest solar irradiance in the past millenium (Spörer, Maunder and Dalton solar minima, Bard et al, 2000; Lean, 2018), and increased volcanic activity (Crowley et al, 2008). Although the LIA has been widely studied, its timing and impact on a global scale are still being discussed, mainly in tropical regions (Juárez et al, 2014) and in the ETNP (Barron and Bukry, 2007; Choumiline et al, 2019; Goni et al, 2006; Juárez et al, 2014; Staines-Urías et al, 2009). In paleolimnological studies in central and southern Mexico, the LIA has been associated with temperature decrease of ~2.0°C and mountain glacier advance (Lozano-García Mdel et al, 2007; Vázquez-Selem, 2011).…”

Section: Introductionmentioning

confidence: 99%

Diatom-based paleoproductivity and climate change record of the Gulf of Tehuantepec (Eastern Tropical Pacific) during the last ~500 years

et al. 2023

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Changes in marine productivity of the last five centuries in the Gulf of Tehuantepec were investigated using a high-resolution record of diatoms, organic carbon (Corg), total nitrogen (TN), Ni/Al, and Cu/Al. The laminated sediments were dated by using 210Pb and 14C, with a bayesian age model providing a new Δ R = 247 ± 30 years for the bulk sediment. The Little Ice Age (LIA) (~1500 to ~1858 CE) was characterized by the predominance of cold-water and high productivity diatoms ( Chaetoceros spores, Thalassionema nitzschioides, Lioloma pacificum, Thalassiosira nanolineata, and Rhizossolenia setigera) and high values of geochemical productivity proxies. A transition period (~1860 to ~1919 CE) toward warmer conditions related to the end of the LIA and the beginning of the Current Warm Period (CWP), was indicated by the appearance of warm-water diatoms ( Neodelphineis pelagica, Thalassiosira tenera, and Rhizossolenia bergonii), as well as lower values of Corg, TN, Ni/Al, and Cu/Al. The most recent period of the CWP (~1920 CE to today) was characterized by the increased abundance warm-water taxa ( N. pelagica, Cymatodiscus planetophorus, T. tenera, Plagiogramma minus, Nitzschia interruptestriata, and R. bergonii), and by the prevalence of low values of Corg, TN, Ni/Al, and Cu/Al. These changes in productivity during the LIA and CWP were likely driven by changes in solar irradiance and the migration of the Intertropical Convergence Zone. This study highlights the spatial extent of the LIA in the Eastern Tropical North Pacific and contributes to the knowledge of the productivity response to climate in tropical regions.

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Variability of the oxygen minimum zone associated with primary productivity and hydrographic conditions in the Eastern North Pacific during the last 1200 years

Sánchez

Juárez²,

Ortiz-Hernández³

et al. 2022

Deep Sea Research Part I: Oceanographic Research Papers

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Variability of marine biological productivity in the northeastern Pacific over the past millennium

Cited by 5 publications

References 31 publications

Paleoceanographic and paleoclimatic reconstruction based on marine palynomorphs in the period 1811–1907 CE in the Magdalena Basin, Baja California Sur, Mexico

Paleoceanographic and paleoclimatic reconstruction based on marine palynomorphs in the period 1811–1907 CE in the Magdalena Basin, Baja California Sur, Mexico

Diatom-based paleoproductivity and climate change record of the Gulf of Tehuantepec (Eastern Tropical Pacific) during the last ~500 years

Variability of the oxygen minimum zone associated with primary productivity and hydrographic conditions in the Eastern North Pacific during the last 1200 years

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