Vertical fluxes of coccolithophores and foraminifera and their contributions to CaCO3 flux off the coast of Ensenada, Mexico

Vertical fluxes of coccolithophores and foraminifera and their contributions to CaCO3 flux off the coast of Ensenada, Mexico

Coccoliths and foraminifera fluxes and their contributions to CaCO3 were estimated by analyzing the material collected by a sediment trap installed in the area adjacent to Ensenada, Baja California (Mexico). Coccoliths were identified and counted from images obtained with a Zeiss-Supra 55VP scanning...

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Auteurs principaux: García-Romero, Felipe, Cortés, Mara Y, Rochín-Bañaga, Heriberto, Bollmann, Jörg, Aguirre-Bahena, Fernando, Lara-Lara, Rubén, Herguera, Juan C
Format: Online
Langue:eng
Publié: Iniversidad Autónoma de Baja California 2017
Accès en ligne:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2765
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id oai:cienciasmarinas.com.mx:article-2765
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author García-Romero, Felipe
Cortés, Mara Y
Rochín-Bañaga, Heriberto
Bollmann, Jörg
Aguirre-Bahena, Fernando
Lara-Lara, Rubén
Herguera, Juan C
spellingShingle García-Romero, Felipe
Cortés, Mara Y
Rochín-Bañaga, Heriberto
Bollmann, Jörg
Aguirre-Bahena, Fernando
Lara-Lara, Rubén
Herguera, Juan C
Vertical fluxes of coccolithophores and foraminifera and their contributions to CaCO3 flux off the coast of Ensenada, Mexico
author_facet García-Romero, Felipe
Cortés, Mara Y
Rochín-Bañaga, Heriberto
Bollmann, Jörg
Aguirre-Bahena, Fernando
Lara-Lara, Rubén
Herguera, Juan C
author_sort García-Romero, Felipe
title Vertical fluxes of coccolithophores and foraminifera and their contributions to CaCO3 flux off the coast of Ensenada, Mexico
title_short Vertical fluxes of coccolithophores and foraminifera and their contributions to CaCO3 flux off the coast of Ensenada, Mexico
title_full Vertical fluxes of coccolithophores and foraminifera and their contributions to CaCO3 flux off the coast of Ensenada, Mexico
title_fullStr Vertical fluxes of coccolithophores and foraminifera and their contributions to CaCO3 flux off the coast of Ensenada, Mexico
title_full_unstemmed Vertical fluxes of coccolithophores and foraminifera and their contributions to CaCO3 flux off the coast of Ensenada, Mexico
title_sort vertical fluxes of coccolithophores and foraminifera and their contributions to caco3 flux off the coast of ensenada, mexico
description Coccoliths and foraminifera fluxes and their contributions to CaCO3 were estimated by analyzing the material collected by a sediment trap installed in the area adjacent to Ensenada, Baja California (Mexico). Coccoliths were identified and counted from images obtained with a Zeiss-Supra 55VP scanning electron microscope. Foraminifera were identified and analyzed with a Leica EZ4 stereoscope. Total CaCO3 was determined by coulometry. A total of 33 species of coccoliths were recorded; the most abundant species were Emiliania huxleyi type A, Gephyrocapsa oceanica (Equatorial), E. huxleyi type B, and G. oceanica (Larger), contributing 74% of total coccolith flux. The maximum flux of coccoliths was 1,539 × 106 m–2·d–1 in sample A-8, the minimum zero in sample A-10, and the average 1,028 × 106 m–2·d–1. Coccolith contribution to CaCO3 content ranged from 0.14 mg·m–2·d–1 in sample A-12 to 25.00 mg·m–2·d–1 in sample A-1, with an average of 5.60 mg·m–2·d–1. Helicosphaera carteri made the highest contribution with 10.00 mg·m–2·d–1 in sample A-1, and the rest of the species contributed <7.00 mg·m–2·d–1. Six genera of planktonic foraminifera were identified: Globigerina, Neogloboquadrina, Globorotalia, Pulleniatina, Globigerinoides, and Orbulina. The maximum flux of foraminifera was recorded in summer (513 m–2·d–1) and the minimum in spring (9 m–2·d–1). Benthic foraminifera were found to make an important contribution, even greater than the contribution from planktonic foraminifera, reflecting horizontal resuspension and/or transport processes. CaCO3 contributions by coccoliths and foraminifera were <1% of total CaCO3, and the rest was contributed by fragments of the other calcareous groups. 
publisher Iniversidad Autónoma de Baja California
publishDate 2017
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2765
_version_ 1797332412633448448
spelling oai:cienciasmarinas.com.mx:article-27652024-04-05T20:26:39Z Vertical fluxes of coccolithophores and foraminifera and their contributions to CaCO3 flux off the coast of Ensenada, Mexico Flujos verticales de cocolitóforos y foraminíferos y su contribución al flujo de CaCO3 frente a la costa de Ensenada, México García-Romero, Felipe Cortés, Mara Y Rochín-Bañaga, Heriberto Bollmann, Jörg Aguirre-Bahena, Fernando Lara-Lara, Rubén Herguera, Juan C Coccoliths and foraminifera fluxes and their contributions to CaCO3 were estimated by analyzing the material collected by a sediment trap installed in the area adjacent to Ensenada, Baja California (Mexico). Coccoliths were identified and counted from images obtained with a Zeiss-Supra 55VP scanning electron microscope. Foraminifera were identified and analyzed with a Leica EZ4 stereoscope. Total CaCO3 was determined by coulometry. A total of 33 species of coccoliths were recorded; the most abundant species were Emiliania huxleyi type A, Gephyrocapsa oceanica (Equatorial), E. huxleyi type B, and G. oceanica (Larger), contributing 74% of total coccolith flux. The maximum flux of coccoliths was 1,539 × 106 m–2·d–1 in sample A-8, the minimum zero in sample A-10, and the average 1,028 × 106 m–2·d–1. Coccolith contribution to CaCO3 content ranged from 0.14 mg·m–2·d–1 in sample A-12 to 25.00 mg·m–2·d–1 in sample A-1, with an average of 5.60 mg·m–2·d–1. Helicosphaera carteri made the highest contribution with 10.00 mg·m–2·d–1 in sample A-1, and the rest of the species contributed <7.00 mg·m–2·d–1. Six genera of planktonic foraminifera were identified: Globigerina, Neogloboquadrina, Globorotalia, Pulleniatina, Globigerinoides, and Orbulina. The maximum flux of foraminifera was recorded in summer (513 m–2·d–1) and the minimum in spring (9 m–2·d–1). Benthic foraminifera were found to make an important contribution, even greater than the contribution from planktonic foraminifera, reflecting horizontal resuspension and/or transport processes. CaCO3 contributions by coccoliths and foraminifera were <1% of total CaCO3, and the rest was contributed by fragments of the other calcareous groups.  Se estimaron los flujos de cocolitos y foraminíferos y su contribución al flujo de CaCO3 mediante el análisis del material recolectado por una trampa de sedimentos instalada en la zona adyacente a Ensenada, Baja California (México). La identificación y el conteo de cocolitos se realizó a partir de imágenes obtenidas con un microscopio electrónico de barrido Zeiss-Supra VP55. Los foraminíferos se identificaron y analizaron con un estereoscopio Leica EZ4. El CaCO3 total se determinó por coulometría. Se registraron 33 especies de cocolitos; las especies más abundantes fueron Emiliania huxleyi tipo A, Gephyrocapsa oceanica (Equatorial), E. huxleyi tipo B y G. oceanica (Larger), que juntas contribuyeron con el 74% del flujo total de cocolitos. El flujo de cocolitos máximo fue de 1,539 × 106 m–2·d–1 en la muestra A-8, el mínimo de cero en la muestra A-10 y el promedio de 1,028 × 106 m–2·d–1. El aporte de CaCO3 por cocolitos osciló desde 0.14 mg·m–2·d–1 en la muestra A-12 hasta 25.00 mg·m–2·d–1 en la muestra A-1, con un promedio de 5.60 mg·m–2·d–1. Helicosphaera carteri presentó el mayor aporte con 10.00 mg·m–2·d–1 en la muestra A-1, y la contribución del resto de las especies fue <7.00 mg·m–2·d–1. Se identificaron 6 géneros de foraminíferos planctónicos: Globigerina, Neogloboquadrina, Globorotalia, Pulleniatina, Globigerinoides y Orbulina. El flujo de testas máximo se registró en el verano (513 m–2·d–1) y el mínimo en la primavera (9 m–2·d–1). Se encontró un aporte importante de foraminíferos bentónicos que inclusive fue mayor que el de foraminíferos planctónicos, lo cual refleja procesos de resuspensión y/o transporte horizontales. El aporte de CaCO3 por cocolitos y foraminíferos fue <1% del CaCO3 total, pues el resto fue aportado por carbonatados de otros grupos calcáreos. Iniversidad Autónoma de Baja California 2017-12-22 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf text/xml text/xml https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2765 10.7773/cm.v43i4.2765 Ciencias Marinas; Vol. 43 No. 4 (2017); 269–284 Ciencias Marinas; Vol. 43 Núm. 4 (2017); 269–284 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2765/1951 https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2765/420420609 https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2765/420420785 Copyright (c) 2017 Ciencias Marinas https://creativecommons.org/licenses/by/4.0

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