<?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>1605-2528</journal-id>
<journal-title><![CDATA[Ecología en Bolivia]]></journal-title>
<abbrev-journal-title><![CDATA[Ecología en Bolivia]]></abbrev-journal-title>
<issn>1605-2528</issn>
<publisher>
<publisher-name><![CDATA[Plural Editores ]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1605-25281996000300065</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Líquenes del Valle de La Paz como bioindicadores de contaminación atmosférica]]></article-title>
<article-title xml:lang="en"><![CDATA[Lichens from the valley of La Paz as bioindicators of atmospheric pollution]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Anze Martin]]></surname>
<given-names><![CDATA[Gary Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Casilla  ]]></institution>
<addr-line><![CDATA[La Paz ]]></addr-line>
<country>Bolivia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>1996</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>1996</year>
</pub-date>
<numero>28</numero>
<fpage>65</fpage>
<lpage>80</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.bo/scielo.php?script=sci_arttext&amp;pid=S1605-25281996000300065&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.bo/scielo.php?script=sci_abstract&amp;pid=S1605-25281996000300065&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.bo/scielo.php?script=sci_pdf&amp;pid=S1605-25281996000300065&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Este estudio pretende contribuir al diagnóstico de la contaminación atmosférica por dióxido de azufre en la ciudad de La Paz, utilizando la bioindicación como un método sencillo, económico y accesible a nuestras condiciones de trabajo. Como resultado de la investigación, se pudo establecer que en los alrededores de la ciudad de La Paz, existe una rica flora de líquenes, con un gran potencial para la realización de estudios de bioindicación. A través de las pruebas realizadas se evidenció que Usnea cf. subfloridana Stirt. y Stereocaulon ramulosum (Sw.) Rausch. son las especies más apropiadas para ser utilizadas como bioindicadores, pues han mostrado signos apreciables de su sensibilidad a los niveles atmosféricos de SO2, experimentando disminución gradual de la respiración y/o cambios detectables en aspecto y morfología. En relación al estudio de biomonitoreo, se evidenciaron, a lo largo del eje troncal de la ciudad (San Francisco - Següencoma) problemas de calidad del aire, porque se observó disminución de la respiración en los ejemplares de líquenes utilizados, con la misma intensidad en los diferentes puntos de exposición. Aunque no se pudo establecer con precisión que el dióxido de azufre sea el único responsable, los ensayos de laboratorio apoyan la idea de que la concentración atmosférica de este compuesto tiene relación con los cambios fisiológicos observados en los líquenes de prueba.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This work pretends to contribute to the diagnosis of sulphur dioxide atmospheric pollution in La Paz, using bioindication as a simple, economic and accessible method considering our working environment. The results establish that in the surroundings of the city and other valleys rich lichen communities can be found with great potential for the development of bioindication research. Through the tests executed it was found that Usnea cf. subfloridana Stirt. and Stereocaulon ramulosum (Sw.) Räusch. are the most suitable species to be used as bioindicators with physiological response to atmospheric sulphur dioxide. With the active biomonitoring essay it was established that trough the principal axis of the city (San Francisco - Següencoma) there are atmospheric pollutíon problems that can by seen by the physiological response of the exposed lichens. Although it is very difflcult to affirm that sulphur dioxide is the only responsible for the reported damage, considering the similitude of the symptoms (depression of respiration rates) with those reported in the laboratory tests, it can be established that atmospheric levels of sulphur dioxide must be related with the reported changes.]]></p></abstract>
</article-meta>
</front><back>
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