<?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>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442018000100403</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v66i1.29502</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Population fluctuation of Schistocerca piceifrons piceifrons (Orthoptera: Acrididae) in the Yucatán Península and its relation with the environmental conditions]]></article-title>
<article-title xml:lang="es"><![CDATA[Fluctuación poblacional de Schistocerca piceifrons piceifrons (Orthoptera: Acrididae) en la Península de Yucatán y su relación con las condiciones climáticas]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Poot-Pech]]></surname>
<given-names><![CDATA[Mario A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-Sánchez]]></surname>
<given-names><![CDATA[Esau]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gamboa-Angulo]]></surname>
<given-names><![CDATA[Marcela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ballina-Gómez]]></surname>
<given-names><![CDATA[Horacio S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes-Ramírez]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Tecnológico de Conkal  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro de Investigación Científica de Yucatán  ]]></institution>
<addr-line><![CDATA[Mérida Yucatán]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2018</year>
</pub-date>
<volume>66</volume>
<numero>1</numero>
<fpage>403</fpage>
<lpage>414</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442018000100403&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442018000100403&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442018000100403&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The Central American Locust Schistocerca piceifrons piceifrons is one of the most damaging plant pest in Mexico and Central America. The present work was carried out to evaluate the seasonal population fluctuation of S. p. piceifrons and vegetation diversity and their association with weather factors and edaphic conditions in the gregarious zone of the Yucatán Península. The study was performed in seven sites during three seasons: North-wind (December 2013), rainy (June 2014) and dry (April 2014). The locust density was sampled in transect of 100 m2, as well as the vegetation in 16 m2: plant species richness (PSR) and relative species density (RSD), and analyzed by generalized linear models. Additionally, soil samples were obtained at 10 cm depth into a 4 × 6 m quadrat, land use in the sites was classified and temperature, precipitation and evaporation of each site were obtained from the database and they were analyzed with multiple factor analysis. The population density of S. p. piceifrons was higher in the sites Panaba, Tizimin, Tunkas and Cenotillo (F= 74.3, P &lt; 0.0001). Characterization of vegetation showed that PSR and RSD were higher during the rainy season relative to those in the dry season (F= 50.4, P &lt; 0.0001). RSD was identified as the most important group associated with locust density (0.86), followed by isotherm/isohyets (0.63), maximum precipitation and temperature (0.60), as well as the land use (0.65); no correlation between locust density and soil characteristics was found. Locust density was positively correlated with the abundance of the grass Panicum maximum (Sr2= 0.85, PC5= 0.87). This work shows that the population of S. p. piceifrons is high in the rainy season and influenced primarily by the abundance of the grass P. maximum and the precipitation. The results indicate that surveys for early detection and control of the locust on the Yucatán Península can focus on areas with the grass P. maximum to predict risk areas and target survey efforts. Rev. Biol. Trop. 66(1): 403-414. Epub 2018 March 01.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La langosta Centroamericana Schistocerca piceifrons piceifrons es una de las plagas más dañinas en México y Centroamérica. El presente trabajo se realizó para evaluar la fluctuación estacional de poblaciones de S. p. piceifrons y su asociación con la diversidad de vegetación, factores climáticos y edáficos en la zona gregarígena de la Península de Yucatán. Se seleccionaron siete sitios y se muestrearon a lo largo de tres estaciones: nortes (diciembre 2013), lluvias (junio 2014) y sequías (abril 2014). La densidad poblacional de la langosta fue muestreada en transectos de 100 m2, así como la vegetación en 16 m2 obteniendo la riqueza de especies vegetales (REV) y la densidad relativa de especies (DRE), y fueron analizadas por modelos lineales generalizados. Adicionalmente se obtuvieron muestras de suelo de 10 cm de profundidad en un área de 4 × 6 m, se clasificó el uso del suelo de cada sitio y se obtuvieron en una base de datos las condiciones de temperatura, precipitación y evaporación para cada sitio, estos datos se analizaron con análisis de factores múltiples. La densidad poblacional de S. p. piceifrons fue mayor en los sitios de Panaba, Tizimin, Tunkas y Cenotillo (F= 74.3, P &lt; 0.0001). La caracterización de la vegetación mostró que la REV y la DRE fueron mayores en la estación de lluvias que en la de sequías (F= 50.4, P &lt; 0.0001). La DRE fue el grupo más importante asociado a la densidad de la langosta (0.86), seguido por las isotermas/isoyetas (0.63) y la precipitación-temperatura máxima (0.60), así como el uso del suelo (0.65); no hubo correlación con las características del suelo. La densidad de la langosta fue correlacionada positivamente con la abundancia del pasto Panicum maximum (Sr2= 0.85, PC5= 0.87). El estudio mostró que las poblaciones de S. p. piceifrons fueron mayores en la estación lluviosa e influenciadas principalmente por la abundancia del pasto P. maximum y la precipitación. Los resultados indican que las exploraciones, la detección temprana y el control de la langosta en la Península de Yucatán puede enfocarse sobre áreas cultivadas con P. maximum para predecir áreas con riesgo y eficientar los recursos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[locust density]]></kwd>
<kwd lng="en"><![CDATA[plant community]]></kwd>
<kwd lng="en"><![CDATA[plant-insect interaction]]></kwd>
<kwd lng="en"><![CDATA[soil conditions]]></kwd>
<kwd lng="en"><![CDATA[weather factors]]></kwd>
<kwd lng="es"><![CDATA[densidad de langosta]]></kwd>
<kwd lng="es"><![CDATA[comunidad de plantas]]></kwd>
<kwd lng="es"><![CDATA[interacción planta-insecto]]></kwd>
<kwd lng="es"><![CDATA[condiciones del suelo]]></kwd>
<kwd lng="es"><![CDATA[factores climáticos]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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