Regresar
Resumen del producto
García-Romero, F., M., Y Cortés, H., Rochín-Bañaga, J., Bollmann, F., Aguirre Bahena, R., Lara-Lara & J.C., Herguera
(2017).
Vertical fluxes of coccolithophores and foraminifera and their contributions to CaCO3 flux off the coast of Ensenada, Mexico.
Ciencias Marinas.
43(4): 269-284.
DOI: 10.7773/cm.v43i4.2765.
Vertical fluxes of coccolithophores and foraminifera and their contributions to CaCO3 flux off the coast of Ensenada, Mexico
Felipe García-Romero 1, Mara Y Cortés 2, Heriberto Rochín-Bañaga 3, Jörg Bollmann 3, Fernando Aguirre Bahena 4, Ruben Lara-Lara 5 y Juan C. Herguera 5
1 Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas
2 Departamento de Geología. Universidad Autónoma de Baja California Sur
3 Department of Earth Sciences. University of Toronto
4 Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Departamento de Oceanoloogía
5 Centro de Investigación Científica y de Educación Superior de Ensenada
Coccoliths and foraminifera fluxes and their contributions to CaCO3 were estimated by analyzing the materialcollected by a sediment trap installed in the area adjacent to Ensenada, Baja California (Mexico). Coccoliths wereidentified 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.
Palabras clave: coccolith fluxes; foraminifera fluxes; CaCO3 fluxes; Sediment traps; Baja California
Para obtener una copia del documento contacta la personal de la biblioteca a través del correo bibliocicimar{a}ipn.mx
Regresar