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Bibliographic Details
Main Author:	A. Muñoz Barbosa
Format:	Artículo científico
Language:	es
Published:	Universidad Autónoma de Baja California 2003
Subjects:	Ciencias de la Tierra Metales mejillones costa noroccidental de Baja California
Online Access:	https://www.redalyc.org/articulo.oa?id=48029104
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Variabilidad geográfica de la concentración de Hg, Co, Fe y Ni en mejillones Mytilus californianus (Conrad, 1837) de la costa de Baja California A. Muñoz Barbosa E. A. Gutiérrez Galindo Ciencias de la Tierra Metales mejillones costa noroccidental de Baja California En este estudio se determinó la distribución espacial de la contaminación por Hg, Fe, Co y Ni en la costa noroccidental deBaja California mediante el uso del mejillón Mytilus californianus como biomonitor. Durante febrero y julio de 1994 serealizaron muestreos de mejillones en ocho localidades situadas a lo largo de 300 km de costa, desde Punta Bandera (10 km al surde la frontera México-EUA) hasta San Quintín (300 km al sur de la frontera). La distribución espacial de Hg presentó ungradiente norte-sur desde Punta Bandera (0.331 µg g1) hasta San Quintín (0.094 µg g1). Este gradiente sugiere que ladistribución de Hg es afectada por las actividades antropogénicas cercanas a la frontera México-EUA. El Co presentó unadistribución espacial con concentraciones significativamente mayores (P < 0.01) en Piedra Blanca (2.98 µg g1) y San Quintín(2.26 µg g1). El Ni mostró una distribución espacial irregular, con concentraciones mayores en Punta Bandera (2.07 µg g1) ySan Quintín (1.83 µg g1). El Fe presentó mayores concentraciones de Punta Banda a Bajamar en febrero (504515 µg g1); aexcepción de Punta China (1142 µg g1), localidad caracterizada por la extracción de material pétreo para el uso de la industriacementera, las estaciones del centro del área de estudio presentan menores concentraciones de este metal. No se observaroncorrelaciones significativas entre los metales y las variables biológicas de los mejillones analizados. En el análisis deagrupamiento (clusters) entre metales, el Hg se asoció a elementos descritos en otro estudio (Ag y Pb) los cuales mostraron estarinfluenciados antropogénicamente. El análisis de agrupamiento entre localidades de muestreo resultó en la integración de treszonas geográfica, las cuales pueden ser definidas como zona contaminada, zona de transición y zona limpia. 2003 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48029104 es http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.1 Vol.29

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* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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