<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0188-8897</journal-id>
<journal-title><![CDATA[Hidrobiológica]]></journal-title>
<abbrev-journal-title><![CDATA[Hidrobiológica]]></abbrev-journal-title>
<issn>0188-8897</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Metropolitana, División de Ciencias Biológicas y de la Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-88972017000300369</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Intervalos de parámetros no-conservativos en sistemas acuáticos costeros de México]]></article-title>
<article-title xml:lang="en"><![CDATA[Intervals of non-conservative parameters in aquatic coastal systems of Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lanza-Espino]]></surname>
<given-names><![CDATA[Guadalupe de la]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez-Mendieta]]></surname>
<given-names><![CDATA[Francisco José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Biología Laboratorio de Hidrobiología]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Metropolitana-Iztapalapa Departamento de Hidrobiología, DCBS Laboratorio de Ecosistemas Costeros]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<volume>27</volume>
<numero>3</numero>
<fpage>369</fpage>
<lpage>390</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-88972017000300369&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-88972017000300369&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-88972017000300369&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes:  Algunos investigadores, para clasificar el estado trófico del agua de sistemas costeros mexicanos, han usado normas, estándares o regulaciones creados para ambientes de otras latitudes y con características climáticas, geológicas y sociales distintas a las de México, debido al desconocimiento de la variación normal de los parámetros fisicoquímicos y biológicos del agua de dichos sistemas; incluso los valores que obtienen se llegan a comparar con normas mexicanas que han sido elaboradas para regular las aguas residuales de uso urbano o industrial descargadas a ríos y lagunas costeras. Los intervalos de concentración de los distintos elementos químicos, las metodologías y las unidades e interpretaciones de esas normativas no son similares a los de las aguas costeras de latitudes tropicales; por lo tanto, los resultados no reflejan de manera adecuada la realidad de los ambientes acuáticos costeros nacionales.  Objetivos:  Difundir las unidades y los in tervalos de variación espacio-temporal normales de los parámetros fisicoquímicos de lagunas, esteros, estuarios, marismas y bahías mexicanos.  Métodos:  Se realizó una amplia búsqueda de información con la finalidad de obtener la variación de los siguientes parámetros en la columna de agua: oxígeno disuelto, nutrientes (nitrogenados y fosforados inorgánicos) y el índice de la biomasa fitoplanctónica (referida como clorofila a), los cuales tienen significado ecológico y que en la acuicultura se consideran indicadores de calidad del agua.  Resultados:  Se presentan los valores promedio, mínimo y máximo de los parámetros analizados en 72 ambientes costeros de México desde 1968 hasta el 2015.  Conclusiones:  El análisis de la información mostró que los intervalos son resultado de las características ambientales de cada sistema acuático. Esta información servirá de referencia para futuros análisis o diagnósticos ambientales y evitará el empleo de normas de instancias extranjeras, cuyas características, tanto ambientales como socioeconómicas, son diferentes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: Due to the lack of knowledge of the normal variation of the physicochemical and biological water parame ters of Mexican coastal systems for classifying their trophic condition, some researchers have categorized these environ ments using norms, standards, or regulations created for environments of other climatic, geological, and social characte ristics, different from those of Mexico; in fact, these values have even been compared with Mexican norms developed for urban or industrial wastewater discharged into rivers and coastal lagoons. The concentration ranges of different chemical elements, methodologies, units, and interpretations of other countries&#8217; regulations are not similar to the conditions of the coastal waters of tropical latitudes and, therefore, their results do not adequately reflect the reality of national coastal aquatic environments.  Goals:  Contribute to the knowledge of the normal spatiotemporal ranges of physicochemical and biological parameters in lagoons, estuaries, marshes, and Mexican bays.  Methods: We conducted an extensive search of information that allowed us to determine normal ranges of variation for the following parameters: oxygen, nutrients (nitrogen and phosphorus) and phytoplankton biomass (chlorophyll a), which have ecological significance, and can even be considered by some as indicators of water quality.  Results:  We include the average, minimum, and maximum values of different variables of 72 coastal environments in Mexico based on studies carried out from 1968 to 2015.  Conclusions: The analysis of the information showed that the intervals are the result of local environmental characteristics that are unique for each system. This information will be helpful in the analysis or diagnosis in future environmental studies, and will avoid the use of foreign standards based on different environmental and socioeconomic characteristics.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Intervalos]]></kwd>
<kwd lng="es"><![CDATA[no conservativos]]></kwd>
<kwd lng="es"><![CDATA[sistemas costeros]]></kwd>
<kwd lng="en"><![CDATA[Intervals]]></kwd>
<kwd lng="en"><![CDATA[non-conservative parameters]]></kwd>
<kwd lng="en"><![CDATA[coastal systems]]></kwd>
</kwd-group>
</article-meta>
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