Radiolarios (Protozoa, Actinopoda) Sedimentados en El Puerto De Caldera (27°04' S; 70°51' W), Chile

Zapata, Jaime; Olivares, Jorge

doi:10.4067/s0717-65382005000100009

Cited by 2 publications

(5 citation statements)

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“…Among the radiolarians with a morphology similar to that obtained for the strontium biomorphs are Actinomma antarcticum, Carposphaera melitomma, Cenosphaera compacta, Acrosphaera murrayana, Stylochlamydium venustum, Cubotholus sp. “A,” and Hollandosphaera hexagonia, among others. , For diatoms, the strontium biomorphs presented high similarity with species Dinothrix pseudoparadoxa, and with genera Puncticulata, Cyclotella, Discostella, Stephanodiscus, Melosira, and Orthoseira sp. , The occurrence of this type of characteristic morphologies by the barium or strontium biomorphs was at a high concentration of CO 2 . These morphologies are pretty similar to those of radiolarians, diatoms, and foraminifers.…”

Section: Resultsmentioning

confidence: 86%

“…"A," and Hollandosphaera hexagonia, among others. 68,83 For diatoms, the strontium biomorphs presented high similarity with species Dinothrix pseudoparadoxa, and with genera Puncticulata, Cyclotella, Discostella, Stephanodiscus, Melosira, and Orthoseira sp. 77,84 The occurrence of this type of characteristic morphologies by the barium or strontium biomorphs was at a high concentration of CO 2 .…”

Section: Barium and Strontium Biomorphs Adopt The Morphology Of Radio...mentioning

confidence: 99%

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Influence of Different Types of Clay Minerals on the Shape and Form of Silica-Carbonates (Biomorphs) of Ca(II), Ba(II), and Sr(II)

Cuéllar‐Cruz

Ramírez-Cardona

Islas

et al. 2022

ACS Earth Space Chem.

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The array of atmospheric and chemical conditions that prevailed during the Precambrian era favored the origin of life in our planet. The minerals and rocks that existed in that era catalyzed the synthesis of the first biomolecules. It has been shown that mineral clays possess the best-suited mineral surface to study the polymerization of protobiomolecules because they catalyze the binding of monomers to form peptides and nucleic acids and foster the binding between them. Inorganic structures exist formed by silica-carbonates of calcium, barium, or strontium, called biomorphs, which emulate the morphological structure of diverse organisms. Some of these morphologies resemble several of the microfossils found in the Precambrian cherts. Notwithstanding, it has not been documented yet whether biomorphs are a consequence of the dissolution of clays in alkaline environments (rich in alkaline earth metals) during the initial stages of the Earth, which would favor the hypothesis that the biomorphs or cherts existed since that time. To know whether biomorphs could have been embedded within minerals or in diverse types of clays and contributed to the synthesis of protobiomolecules, we aimed at synthesizing biomorphs in the presence of different clays of natural origin in two synthesis conditions that resemble both the atmosphere of the Precambrian era and that of the current time, regarding the CO2 concentration. Our results revealed that in the condition emulating the Precambrian, polymorphs of calcite, aragonite, and vaterite were formed. The barium and strontium biomorphs adopted the morphology of radiolarians, diatoms, and foraminifers in this same condition, indicating that they could be the first structure of these organisms. Results also revealed that the clays present in the Precambrian together with the prevailing environmental conditions played a preponderant role as catalyzers in the structural morphology, chemical composition, and crystalline habit adopted by the first organisms. Biomorphs could have been the first inorganic structures with a structural order and characteristic shape (preserving biomolecules in their interior when they were formed) that were synthetized in the early era of our planet, but they have not been dated as a fossil registry.

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Section: Resultsmentioning

confidence: 86%

Section: Barium and Strontium Biomorphs Adopt The Morphology Of Radio...mentioning

confidence: 99%

Influence of Different Types of Clay Minerals on the Shape and Form of Silica-Carbonates (Biomorphs) of Ca(II), Ba(II), and Sr(II)

Cuéllar‐Cruz

Ramírez-Cardona

Islas

et al. 2022

ACS Earth Space Chem.

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“…Esto coincide con el trabajo realizado por Zapata & Olivares (2005) en los sedimentos de Caldera, Norte de Chile, donde encuentran un claro predominio de este Orden, al igual que en otras partes del mundo (e.g. Benson 1966;Kling & Boltovskoy 1995;Grupta et al 2002;Yamashita et al 2002;Nimmergut & Abelmann 2002).…”

Section: Discusionunclassified

“…Benson 1966;Kling & Boltovskoy 1995;Grupta et al 2002;Yamashita et al 2002;Nimmergut & Abelmann 2002). La especie más abundante encontrada en este estudio es Cenosphaera cristata, pero existe mucha confusión a cerca de su clasificación, por lo que en este estudio sólo se buscó bibliografía asociada al Género Cenosphaera, el cual, de acuerdo a los datos recopilados, se distribuye en los sedimentos superficiales del fondo marino de la Bahía de la Paz, México (Alvarez & Murillo 1989), relacionada a procesos de surgencias, también en los sedimentos del Norte de Chile (Zapata & Olivares 2005), Golfo de California (Benson 1966), Este Ecuatorial del Océano Pacífico (Boltovskoy & Jankilevich 1985), Noreste tropical del Océano Atlántico (Boltovskoy & Uliana 1996). Frente a Concepción, como la mayoría de las especies encontradas en este estudio, este género alcanza su mayor abundancia, por lo que podría estar relacionado a zonas de alta productividad, tal como en Bahía de la Paz y el Golfo de California.…”

Section: Discusionunclassified

“…En Chile la primera información que se tiene de los radiolarios corresponde al estudio realizado por Haeckel (1887) con material recolectado por el Challenger (1873-1876). Zapata & Olivares (2005) describieron e ilustraron 30 especies de radiolarios en Caldera. También en la misma zona norte Zapata & Rojas (2006) describen e ilustran 60 especies de Polycystinos.…”

Section: Introduccionunclassified

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Radiolarios Polycystina (Protozoa: Nassellaria Y Spumellaria) Sedimentados en La Zona Centro-Sur De Chile (36°- 43° S)

Margarita

Giglio

2008

Gayana (Concepc.)

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RESUMENLos radiolarios son protozoos planctónicos marinos, los cuales, a pesar de ser sólo una célula, son sofisticados y complejos organismos. La Subclase Radiolaria está formada por 2 superórdenes: Trypilea y Polycystina, siendo el último el más estudiado, pues su esqueleto de opal es más resistente a la disolución en agua de mar y por ende, más comúnmente preservados en el registro fósil. Los radiolarios han sido usados como una útil herramienta oceanográfica, bioestratigráfica y paleoambiental, gracias a su esqueleto de sílice y a su gran rango geológico. En nuestro país el conocimiento de este grupo es muy escaso, es por esto que el presente trabajo, tiene como principal objetivo, aportar con la identificación y descripción de especies de radiolarios Polycystinos, no antes registrados para esta zona en particular. El material fue recolectado por la Expedición PUCK R/V Sonne Cruise SO-156 Valparaíso-Chiloé-Talcahuano realizada en mayo de 2001. Se analizaron 20 muestras tomadas entre 125 y 3.485 m de profundidad, distribuidas desde Concepción hasta Chiloé (36º-43ºS). Se identificaron un total de 28 especies pertenecientes a 20 géneros y a 9 familias. La mayor cantidad de individuos fue encontrada en la estación 3 frente a Concepción a 798 m de profundidad, lo que se asocia a los periodos de surgencias estacionales y a procesos de sedimentación de las testas y disolución del opal relativamente cortos. Hacia el sur disminuye notablemente la abundancia de ambos órdenes estudiados. PALABRAS CLAVES: Radiolarios, Polycystina, Nassellaria y Spumellaria, recientes, opal, Pacífico sureste, Chile. ABSTRACTThe radiolarians are planktonic marine protozoans, which although be only one cell, are sophisticated and complex organisms. The Subclass Radiolaria is formed by two superorders: Trypilea and Polycystina, this last is the most studied, because its skeleton from opal is resistent to the sea water disolution and for this reason are preserved in the fosil record. The radiolarians have been used like a useful oceanographic, biostratigraphic and paleoambiental tool for their silica skeleton and large geologic range. In our country the knowledge of this group is poor, for this reason the present work has the objective to contribute with the indentification and description of Polycystins radiolarians not described and recorded before for this particular zone. The material used was obtained to the PUCK R/V Sonne Cruise SO-156 Valparaíso-Chiloé-Talcahuano Expedition realized in may of 2001. The 20 samples were obtained with a multicore between 125 and 3.485 m depth distributed from Concepción to Chiloé (36°-43°S). Were idientified 28 species appertaining to 20 genus and 9 families. The major amount of individuals was found in the station 3 in front of Concepción to 789 m depth, this could be associated at the seasonals upwelling periods and process to sedimentation of the shells and opal disolution relatively short. Southward decrease the abundance of the two orders studied.

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Radiolarios (Protozoa, Actinopoda) Sedimentados en El Puerto De Caldera (27°04' S; 70°51' W), Chile

Cited by 2 publications

References 13 publications

Influence of Different Types of Clay Minerals on the Shape and Form of Silica-Carbonates (Biomorphs) of Ca(II), Ba(II), and Sr(II)

Influence of Different Types of Clay Minerals on the Shape and Form of Silica-Carbonates (Biomorphs) of Ca(II), Ba(II), and Sr(II)

Radiolarios Polycystina (Protozoa: Nassellaria Y Spumellaria) Sedimentados en La Zona Centro-Sur De Chile (36°- 43° S)

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