<?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>S0034-77442025000300016</article-id>
<article-id pub-id-type="doi">10.15517/rev.biol.trop..v73is2.64525</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Differences in duet coordination influence territorial response on a year-round territorial bird species]]></article-title>
<article-title xml:lang="es"><![CDATA[Las diferencias en la coordinación de dúos influyen en la respuesta territorial de una especie de ave territorial durante todo el año]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sandoval]]></surname>
<given-names><![CDATA[Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Juárez]]></surname>
<given-names><![CDATA[Roselvy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bonilla-Badilla]]></surname>
<given-names><![CDATA[Katherine]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Graham]]></surname>
<given-names><![CDATA[Brendan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica Laboratorio de Ecología Urbana y Comunicación Animal ]]></institution>
<addr-line><![CDATA[Montes de Oca San José]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Costa Rica CIBET Colección de Bioacústica, Museo de Zoología]]></institution>
<addr-line><![CDATA[ San José]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,University of Lethbridge Department of Biological Sciences ]]></institution>
<addr-line><![CDATA[ Alberta]]></addr-line>
<country>Canada</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>05</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>05</month>
<year>2025</year>
</pub-date>
<volume>73</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442025000300016&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442025000300016&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442025000300016&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  Twelve functions have been assigned to avian vocal duets (e.g., maintaining contact, mate guarding, signaling quality, or resource defense). To separate between functions of duets it is necessary to take into account who is the receiver, the information coded by the sender, and if there is a conflict between pair members. Duets used for resource defense (e.g., territory) are a more aggressive signal than solo songs because they act as a joint defense signal that encode a pairs&#8217; strength or time together in the coordination of both individuals&#8217; song. Therefore, interacting pairs may use duet coordination to respond according to rival information.  Objective:  Our main objective in this study was to test whether the coordination in time and frequency of White-eared Ground-Sparrow (Melozone leucotis) pair duets influences the territorial response of conspecific pairs.  Methods:  We recorded 2-5 duets from 31 territorial pairs and measured duet coordination by dividing each ground-sparrow duet into three sections (include sections here) according to each individual&#8217;s contribution. In each section we measured frequency range and duration and the difference in frequency range and duration between the introductory and middle section, and the middle and terminal section of each duet. We then used a playback experiments to test pair response to duet coordination. Each pair were exposed to two types of duets: highly coordinated duets and a poorly coordinated duets.  Results:  We exposed 31 pairs to these two treatments during duet playbacks and measured their territorial response according to the simulated intruders&#8217; duet coordination. We found that pairs that produced highly coordinated duets approached faster and spent more time closer to all playbacks. By comparison, territorial pairs spent more time closer to the poorly coordinated duet stimulus. Total number of vocalization produced in response to duet stimuli were similar between stimuli and independent of the duet coordination of the territorial pairs.  Conclusions:  Our study indicates that, duet coordination in territorial pairs of White-eared Ground-sparrows is a good predictor of the strength in territorial defense and suggests that pairs used duet coordination to perceive the level of threat from an intruder.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  Se han asignado doce funciones a los duetos vocales de las aves (por ejemplo, mantener el contacto, proteger a la pareja, o defensa de recursos). Para separar las funciones de los duetos es necesario tener en cuenta quién es el receptor, la información codificada por el emisor y si existe algún conflicto entre los miembros de la pareja. Los duetos utilizados para la defensa de recursos (ej.: territorio) son una señal más agresiva que los cantos en solitario porque actúan como una señal de defensa conjunta que codifica la fuerza de una pareja o el tiempo que pasan juntos en la coordinación del canto de ambos individuos. Por lo tanto, las parejas pueden utilizar características de los duetos para responder de acuerdo con la información de una pareja rival.  Objetivo:  Nuestro principal objetivo en este estudio fue probar cómo la coordinación en tiempo y frecuencia de los duetos de las parejas de Melozone leucotis influencian la respuesta territorial de parejas conespecíficas.  Métodos:  Registramos de 2 a 5 duetos de 31 parejas territoriales y medimos la coordinación del dueto utilizando un método descrito anteriormente que dividió cada dueto de M. leucotis en tres secciones según la contribución de cada individuo. En cada sección medimos el rango de frecuencia, la duración y la diferencia en el rango de frecuencia y la duración entre la sección introductoria y media, y la sección media y terminal de cada dueto. Luego utilizamos experimentos de playback para probar la respuesta de la pareja a la coordinación del dueto. Cada pareja estuvo expuesta a dos tipos de dueto: duetos altamente coordinados y mal coordinados.  Resultados:  Expusimos a 31 parejas a estos dos tratamientos durante las reproducciones a dueto y medimos su respuesta territorial de acuerdo con la coordinación del dueto de los intrusos simulados. Descubrimos que las parejas que producían duetos altamente coordinados se acercaban más rápido y pasaban más tiempo cerca de todos los estímulos. En comparación, las parejas pasaron más tiempo más cerca del estímulo del dueto mal coordinado. El número total de vocalizaciones producidas en respuesta a estímulos de dueto fueron similares entre estímulos e independientes de la coordinación de dueto de las parejas territoriales.  Conclusiones:  Nuestro estudio indica que la coordinación del dueto en parejas territoriales de M. leucotis es un buen predictor de la defensa territorial y sugiere que las parejas utilizan la coordinación del dueto para percibir el nivel de amenaza de un intruso.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[acoustic communication]]></kwd>
<kwd lng="en"><![CDATA[duets]]></kwd>
<kwd lng="en"><![CDATA[duet coordination]]></kwd>
<kwd lng="en"><![CDATA[Passerellidae]]></kwd>
<kwd lng="en"><![CDATA[sparrows.]]></kwd>
<kwd lng="es"><![CDATA[comunicación acústica]]></kwd>
<kwd lng="es"><![CDATA[duetos]]></kwd>
<kwd lng="es"><![CDATA[coordinación de duetos]]></kwd>
<kwd lng="es"><![CDATA[Passerellidae]]></kwd>
<kwd lng="es"><![CDATA[gorriones.]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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