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2 resultados encontrados para: AUTOR: Shumilin, Evgueni
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Vertical variability of benthic foraminifera and trace elements in a tropical coastal lagoon in the Gulf of California
Sánchez, Alberto (autor) ; Gómez León, Adriana (autora) ; Pérez Tribouillier, Habacuc (autor) ; Rey Villiers, Néstor (autor) ; Ortíz Hernández, Ma. Concepción (autora) ; Rodríguez Figueroa, Griselda Margarita (autora) ; Shumilin, Evgueni (autor) ;
Disponible en línea
Contenido en: Marine Pollution Bulletin Volumen 158, artículo número 111417 (September 2020), p. 1-9 ISSN: 0025-326X
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Population growth around water bodies is deteriorating environmental quality. The benthic foraminiferal and trace element concentration in a pair of short sediment cores were used to establish the quality of the sedimentary environment in a tropical coastal lagoon in the southwestern Gulf of California. From 25 cm depth towards the surface of the sediment core, Ammonia beccarii was dominant over nontolerant species and the concentrations of V, Ni, Co, Zn, Cu, Hg and Pb in the sediments increased compared with the lower depth intervals. This finding suggests a deterioration in the environmental quality of the lagoon since 1980, associated with an increase in the sizes of the population and vehicle fleet in the city of La Paz, Baja California Sur, and with the operation of three fossil fuel-based thermoelectric plants since 1985.

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Evidence of intense suboxia and anoxia in a tropical bay of the Gulf of California
Sánchez, Alberto (autor) ; Rodríguez Figueroa, Griselda Margarita (autora) ; Shumilin, Evgueni N. (coaut.) ; Ortíz Hernández, Ma. Concepción (autora) ;
Contenido en: Continental Shelf Research Vol. 168 (September 2018), p. 21-27 ISSN: 0278-4343
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The expansion of the upper boundary of the oxygen minimum zone (OMZ) has been associated with the low solubility of oxygen in the surface ocean due to global warming in tropical regions. However, sedimentary records of δ15N of sinking particulate organic matter and sediments suggest that oxygen solubility is controlled by oceanographic forcing in the tropical equatorial region. To determine the intensification of the OMZ within its upper border, δ15N analysis of the organic matter in superficial sediments of La Paz Bay was carried out. In the present work, 115 samples of superficial sediment were collected in the interval of 2–407 m depth in La Paz Bay. The surface sediments were analysed for the nitrogen isotopic composition of their organic matter. Hypoxia conditions (< 60 μM) at 100 m to depth suggest an intense denitrification of the water column that it was reflected in the sedimentary δ15N. The δ15N of the organic matter is 1.5‰ greater in the bay than in the mouth of the Gulf of California, indicating greater denitrification towards the interior of the bay with respect to the gulf mouth. The intense suboxia/anoxia conditions have been maintained due to a well-mixed water column that promotes exported productivity in La Paz Bay.