Coccolith Sr/Ca is a robust temperature and growth rate indicator that withstands dynamic microbial interactions

Abstract

Coccolithophores are a highly diverse group of single-celled marine algae belonging to the haptophyte clade (Jordan & Chamberlain, 1997;de Vargas et al., 2007). They evolved over 200 million years ago and have flourished in the world oceans ever since (Bown, 1985;Mai et al., 1997). Their name is derived from the elaborate CaCO 3 platelets, termed coccoliths, that cover the algal cell (Young et al., 1992). The coccoliths are produced intracellularly in a designated compartment termed the coccolith vesicle and are ejected onto the

Bacteria contribute exopolysaccharides to an algal-bacterial joint extracellular matrix

“…Although less complex than algal exudates, this approach simplifies the process of gaining mechanistic insights by overcoming the chemical complexity of exudates. Altogether, our findings highlight the multifaceted role of algal exudates, In this algal strain, only roughly 20% of cells are calcified 88 . Scale bar corresponds to 5 μm.…”

“…White particles in the DIC images are algal calcified coccoliths. In this algal strain, only roughly 20% of cells are calcified 88 . Scale bar corresponds to 5 µm.…”

Coccolith-calcite Sr/Ca as a proxy for transient export production related to Saharan dust deposition in the tropical North Atlantic

“…Previous sediment-trap records in the Sargasso Sea and Arabian Sea 30 , and in the Eastern Mediterranean 32 have already provided relevant indications about nutrient limitation of coccolithophore in situ productivity versus coccolith export efficiency out of the photic zone based on coccolith Sr/Ca ratios. Auliaherliaty et al 33 further demonstrate that Sr/Ca are not impacted by bacterial influences on algal physiology, thereby reinforcing the robustness of this ratio as a productivity proxy.

Figure 1 Location of trap mooring site M4 ( A ), and a schematic representation of the main surface currents in the equatorial Atlantic Ocean, with the inset showing the seasonal eastward retroflection of the North Brazilian Current (NBC) during boreal summer ( B ) (adapted from 8 , 36 ).

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Nanofósiles calcáreos de la Formación Los Molles al sur de la Dorsal de Huincul, Cuenca Neuquina, Argentina: bioestratigrafía y reconstrucciones paleobiogeográficas para el Jurásico Temprano-Medio (Pliensbachiano-Aaleniano)

“…En consonancia con los aspectos previamente comentados, los nanofósiles calcáreos consituyen importantes indicadores de cambios físicos y químicos que ocurrieron en la parte superior de la columna de agua, conviertiéndose así en una valiosa fuente de información sobre condiciones paleoambientales. Numerosas contribucio nes enfocadas en este grupo arrojan luz sobre fluctuaciones en el nivel del mar, paleotempertauras, paleoproductividad primaria y disponibilidad de nutrientes (e.g., Wind y Wise, 1978;Baumann et al, 1999;Bornemann et al, 2005;Mattioli et al, 2008Mattioli et al, , 2009Tiraboschi et al, 2009;Mutterlose y Bottini, 2013;Aguado et al, 2014;Bottini et al, 2015;Botinni y Erba, 2018;Menini et al, 2017;Faucher et al, 2019;Choudhari et al, 2019;Baghli et al, 2022;Chan et al, 2022;Eliason y Segev, 2022;Godbillot et al, 2022), así como las preferencias paleoecológicas y respuestas morfológicas de algunas especies (e.g., Roth y Krumbach, 1986;Bralower, 1988;Watkins, 1989;Erba, 1994;Herrle y Mutterlose, 2003;Tremolada et al, 2006;Bottini y Mutterlose, 2012;Gollain et al, 2019;Mattioli et al, 2004a;Olivier et al, 2004;Giraud et al, 2006;Giraud, 2009;Saruwatari et al, 2016;Ferreira et al, 2017;Al-Mojel et al, 2020;Linge Johnsen y Bollmann, 2020).…”