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Zaytsev, Oleg; Cervantes‐Duarte, Rafael; Montante, Orzo Sánchez; García, Artemio Gallegos

doi:10.1023/a:1025544700632

Cited by 145 publications

(56 citation statements)

References 13 publications

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“…The sea surface temperature (SST) varies from a minimum in March-April (16-21°C) to a maximum in July-October (22-28°C; Moderate Resolution Imaging Spectroradiometer [MODIS]-Aqua, 2014). Primary productivity along the Baja California margin varies according to nutrient availability and coastal upwelling that is more intense in spring (April-June) than the rest of the annual cycle (Marchitto et al, 2010;Zaytsel et al, 2003). The higher chlorophyll concentration (total Chl-a) occurs during the cold seasons and the lowest concentration during the warm seasons (≤0.03-14.94 mg/m 3 and 0.02-3.31 mg/m 3 , respectively; Martinez-Almeida et al, 2014; MODIS-Aqua, 2014).…”

Section: Modern Ocean and Climate Settingsmentioning

confidence: 99%

“…Today in the NE Tropical Pacific off BCP, the wind-driven coastal upwelling is one important mechanism that injects nutrients into the euphotic zone (Zaytsel et al, 2003). An additional component is the California Current carrying cold and nutritive waters throughout the coastal region (González-Rodríguez et al, 2012).…”

Section: Paleoceanography and Paleoclimatologymentioning

confidence: 99%

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A 14‐ka Record of Dust Input and Phytoplankton Regime Changes in the Subtropical NE Pacific: Oceanic and Terrestrial Processes Linked by Teleconnections at Suborbital Scales

Arellano‐Torres

Álvarez-Covelli

Kasper‐Zubillaga³

et al. 2019

Paleoceanog and Paleoclimatol

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We study shifts in phytoplankton proxies linked to terrigenous inputs and teleconnections in a core from Soledad Basin, Gulf of Ulloa, NW Mexico, spanning the end of the deglaciation and the Holocene. We used biogenic opal (% opal), organic carbon (% total organic carbon [TOC]), and inorganic carbon (% CaCO3) as proxies of productivity and opal/TOC and CaCO3/TOC ratios as proxies of nutrient uptake and C‐export by siliceous and carbonate organisms. We reconstructed terrestrial inputs and identified authigenic gypsum. Based on opal/TOC and CaCO3/TOC ratios, we found periodic changes of ~0.5, 1.1–1.8 ka cycle in phytoplankton proxies exporting siliceous and carbonate skeletal debris to the sediments. An increase in carbonate organisms occurred during 14–8.7 ka, corresponding to reduced El Niño–Southern Oscillation (ENSO)‐like variability, in parallel to the northward displacement of the Intertropical Convergence Zone (ITCZ) and an overall negative phase of the Pacific Decadal Oscillation (PDO). An increase in siliceous organisms occurred between 6 and 3 ka, coincident with strong ENSO‐like conditions, southern migration of ITCZ, and less intense but more frequent positive PDO‐hydrological variability. Grain size analyses show significant amounts of fine fraction (dust <6.6 μm) present during the early‐ to mid‐Holocene in agreement to extreme weather on land, with episodes of eolian and fluvial transport to the sea. The ENSO‐like variations influenced biological C‐export producers on a scale of 1.1–1.8 ka, but PDO‐related variability is uncertain. We suggest that Holocene drivers for phytoplankton successions are changes in insolation, ITCZ migration, California Current upwelling, nutrient inputs by advection, and terrestrial sources.

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Section: Modern Ocean and Climate Settingsmentioning

confidence: 99%

Section: Paleoceanography and Paleoclimatologymentioning

confidence: 99%

A 14‐ka Record of Dust Input and Phytoplankton Regime Changes in the Subtropical NE Pacific: Oceanic and Terrestrial Processes Linked by Teleconnections at Suborbital Scales

Arellano‐Torres

Álvarez-Covelli

Kasper‐Zubillaga³

et al. 2019

Paleoceanog and Paleoclimatol

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“…En este trabajo la correlación negativa del Cd (p > 0.05) con los demás metales puede deberse a que el 99 % de Cd presente en aguas superficiales en la región del Golfo de California tiene un origen natural relacionado con procesos físicos de surgencias y advección de aguas, mientras que sólo el 1 % proviene de fuentes antrópi-cas (Sañudo-Wilhelmy y Flegal 1991). En las lagunas en estudio, las surgencias tienen eventos pulsátiles de afloramiento de aguas subsuperficiales anualmente entre octubre y marzo (Zaytsev et al 2003). Durante 1 TEL = máxima concentración a la cual ningún efecto es observado (Buchman 2008) 2 ERM = probabilidad de presentarse efectos adversos en el 50 % de las observaciones (Buchman 2008) 3 AET = nivel de efecto aparente (Buchman 2008) 4 log 10 ICM = logaritmo del índice de contaminación metálica Media ± error estándar, mínimo y máximo.…”

Section: Discusión Elementos Traza En Sedimentosunclassified

Calidad De Sedimentos Asociada a Actividades Antrópicas en Lagunas Costeras Semiáridas Subtropicales De La Costa Central Este Del Golfo De California

González¹,

Arreola-Lizárraga²,

Hernández

et al. 2017

Rev. Int. Contam. Ambie.

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Palabras clave: elementos traza, sedimentos estuarinos, índices de contaminación, agricultura, acuicultura RESUMEN La calidad de los sedimentos superficiales de las lagunas costeras Lobos y Tóbari, ambas receptoras de efluentes del Valle del Yaqui, en el Golfo de California, México, fue evaluada. Las concentraciones de níquel, zinc, cobre, cadmio, manganeso, plomo y hierro fueron determinadas en sedimentos de estas lagunas y del estero el Soldado que es un área natural protegida sin descargas antrópicas. El índice de contaminación metálica (ICM), el factor de enriquecimiento (FE) y el índice de geoacumulación (I geo ) fueron calculados. Se utilizaron los valores guía de calidad de sedimento (SQV, por sus siglas en inglés) para valorar el potencial riesgo a la salud de la biota. La laguna Lobos presentó la media de concentración más alta de zinc (70.1 µg/g) y cobre (16.3 µg/g), Tóbari la más alta de manganeso (747 µg/g) y El Soldado la más baja de hierro (1.05 %), así como también el menor ICM. Tanto en la laguna Lobos como en la Tóbari, el manganeso fue el único elemento que presentó un FE que indica influencia antropogénica y un I geo que corresponde a moderado. Los sitios más afectados en ambas lagunas fueron los más cercanos a las zonas agrícolas. Los SQV sugieren que en los sitios con concentraciones de níquel > 51.6μg/g (registrado en un sitio en Lobos) y de manganeso > 260μg/g (Lobos y Tóbari), deben establecerse medidas de mitigación. Lo anterior, dado que a esos niveles, dichos elementos pueden causar efectos adversos y deterioro del habitat que las especies utilizan para su reproducción, crianza y/o protección en estos ecosistemas costeros.

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“…The peninsula extends 1,100 km from intra tropical to low temperate latitudes, and is affected, on north–south and east–west gradients, by tropical, temperate, regional, and local circulations (Dettinger 2004; Douglas et al 1993; Farfán 2005; Salinas-Zavala et al 2002). The east–west gradient is sustained by the warm waters of the Gulf of California, contrasting with the cool current and upwellings along the Pacific coast (Zaytsev et al 2003). The center of the peninsula, comprising the Vizcaíno subregion of the Sonoran Desert (Shreve 1964), is notable for the variety of plant life forms in most areas (Peinado et al 2005; Shreve 1964; Turner and Brown 1982).…”

Section: Introductionmentioning

confidence: 99%

Vegetation response to hydrologic and geomorphic factors in an arid region of the Baja California Peninsula

Rodríguez-Moreno

Bullock

2013

Environ Monit Assess

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Remotely sensed imageries were used to analyze the response of desert vegetation to physiographic factors and accumulated precipitation in drier and wetter years within a region of >16,500 km2 sampled with 5,000 random pixels of 30 m. Vegetation development was indexed by the annual maximum values for greenness (SAVI) and canopy water content (NDII). Precipitation was interpolated from the 0.25° grid of the Tropical Rainfall Measurement Mission satellite-based estimates, showing a regional average of ∼55 mm in the wetter year. The vegetation indices were only weakly related to total precipitation, often in a negative sense. Terrain factors that most often affected the vegetation indices, in multiple regression models, were Topographic Wetness Index, elevation, and slope gradient; these often had different signs for SAVI and for NDII. Models for NDII on intrusive igneous rocks gave better results than on extrusive igneous rocks. The strongest patterns in vegetation development were the contrast among Pacific coast, Cordillera, and Gulf coast subregions and the generally stronger results for NDII than SAVI.

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Untitled

Cited by 145 publications

References 13 publications

A 14‐ka Record of Dust Input and Phytoplankton Regime Changes in the Subtropical NE Pacific: Oceanic and Terrestrial Processes Linked by Teleconnections at Suborbital Scales

A 14‐ka Record of Dust Input and Phytoplankton Regime Changes in the Subtropical NE Pacific: Oceanic and Terrestrial Processes Linked by Teleconnections at Suborbital Scales

Calidad De Sedimentos Asociada a Actividades Antrópicas en Lagunas Costeras Semiáridas Subtropicales De La Costa Central Este Del Golfo De California

Vegetation response to hydrologic and geomorphic factors in an arid region of the Baja California Peninsula

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