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Ecological Zonation of phytoplankton and Biomass Based on Bio-Optical parameters off Baja California during Three summer seasons

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Open Journal of Marine science 2019年第3期9卷 121-136页

作者： sánchez-p.rez elvia denisse Millán-Núnez Eduardo Department of Marine Ecology Centro de Investigación Científica y de Educación Superior de EnsenadaEnsenadaMéxico Department of plankton and Marine Ecology CONACyT-Instituto Politécnico Nacional-Centro Interdisciplinario de Ciencias MarinasLa PazMéxico

An ecological zonation of phytoplankton was determined from its normalized spectral absorption shape (aphn) during the summers of 2001-02-03 off the west coast of Baja California. In the first two seasons, the highest abundances of the main taxonomic groups of phytoplankton were detected towards the coastal stations, but for 2003, diatoms showed higher abundances towards the oceanic region. The ecological provinces (pv) were the footprint of the zonation in the structure of the phytoplankton community;likewise, it was observed that the spectral shape was independent of the chlorophyll-a (mg·m-3). The effect of coastal upwelling south of Vizcaíno Bay favored the increase of phytoplankton cells. However, the composition of the community decreased in cells abundance and diversity due to the influence of the phenomenon called El Nino “débil” reported to the south of the California Current for the years 2002-03.

关键词： Ecological Zonation phytoplankton Bio-Optics El Nino Débil

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Influence of Humidity on Yield stress Determination by slump Test of slip-prone Clayey soils and Their Relation with the Chemical properties

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Advances in Materials physics and Chemistry 2012年第4期2卷 102-105页

作者： Arturo F. Méndez-sánchez Ana M. paniagua-Mercado Karen E. Nieto-Zepeda Leonor p.rez-Trejo elvia Diaz Valdés Concepción Mejía García Escuela superior de Física y Matemáticas Instituto Politécnico Nacional Edif. 9 Unidad Profesional Adolfo López Mateos Col. Lindavista C. P. 07738 México D. F. México.

In this work, the yield stress evaluation as a function of water content for slip-prone clayey soils is studied in order to understand how yield stress decreases as water content increases, and their relation with the chemical properties. The clayey soil samples were taken from the region of Teziutlán-puebla-Mexico. Yield stress was calculated using the slump test in cylindrical geometry. Results show three zones. The first one shows an exponential decrement on yield stress due to lower water content in accord with clayey soils with high content of illita, followed by a second region where yield stress decreases dramatically at a certain critical water concentration, and the third one where yield stress dependence is not well-defined since the clayey soil flow is seen. Finally, it is discussed how yield stress variation due to the water increment influences the landslide risk increment.

关键词： Clayey soil Yield stress slump Test Microstructure Illita

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