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Autor principal:	Nancy de La Cruz-Landero
Formato:	Artículo científico
Lenguaje:	es
Publicado:	Recursos Genéticos Forestales 2013
Materias:	Biología Manglar toxicidad metales pesados
Acceso en línea:	https://www.redalyc.org/articulo.oa?id=49728291003 https://www.redalyc.org/journal/497/49728291003/ https://www.redalyc.org/journal/497/49728291003/html/ https://www.redalyc.org/journal/497/49728291003/49728291003.epub https://www.redalyc.org/journal/497/49728291003/movil
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ACUMULACIÓN DE METALES PESADOS EN SEDIMENTOS DEL ECOSISTEMA MANGLAR EN LAGUNA DE TÉRMINOS, CAMPECHE, MÉXICO Nancy de La Cruz-Landero Ángel Alderete Chávez Sandra Laffón Leal Biología Manglar toxicidad metales pesados La acumulación de metales pesados en los ecosistemas tropicales causa severos problemas en el ambiente, daños severos en la cadena trófica y en las actividades productivas en general. Por ello el objetivo de este estudio fue determinar las concentraciones de Cadmio (Cd), Plomo (Pb) y Níquel (Ni) en sedimentos de manglares en el área de influencia Laguna de Términos en el estado de Campeche, los resultados obtenidos permiten señalar que en el sitio 4 se encontraron valores superiores a los permisibles para estos -1 metales con 0.75 y 16.05 mg/kg de Cd y Pb respectivamente, mientras en el sitio 2 Pb y Ni tienen las -1 -1 concentraciones más altas con 16.04 mg/kg y 82 mg/kg , al comparar las concentraciones se observaron diferencias mínimas significativas p<0.005. Aunque los niveles de toxicidad son tolerables, se advierte un aumento en las actividades humanas que utilizan estas áreas como vertederos. 2013 artículo científico 1405-7247 https://www.redalyc.org/articulo.oa?id=49728291003 https://www.redalyc.org/journal/497/49728291003/ https://www.redalyc.org/journal/497/49728291003/html/ https://www.redalyc.org/journal/497/49728291003/49728291003.epub https://www.redalyc.org/journal/497/49728291003/movil es http://www.redalyc.org/revista.oa?id=497 Foresta Veracruzana application/pdf Recursos Genéticos Forestales Foresta Veracruzana (México) Num.1 Vol.15

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @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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