<?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>0120-0488</journal-id>
<journal-title><![CDATA[Revista Colombiana de Entomología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Colomb. Entomol.]]></abbrev-journal-title>
<issn>0120-0488</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Colombiana de Entomología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-04882007000200012</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Dinámica estacional de la estructura trófica de un ensamblaje de Coleoptera en la Amazonia Colombiana]]></article-title>
<article-title xml:lang="en"><![CDATA[Seasonal dynamics of the trophic structure of an assemblage of Coleoptera in the Colombian Amazon]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[ARI NORIEGA A]]></surname>
<given-names><![CDATA[JORGE]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[BOTERO]]></surname>
<given-names><![CDATA[JUAN PABLO]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[VIOLA]]></surname>
<given-names><![CDATA[MARCELO]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[FAGUA]]></surname>
<given-names><![CDATA[GIOVANNY]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Pontificia Universidad Javeriana Laboratorio de Entomología Unidad de Ecología y Sistemática - UNESIS]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Pontificia Universidad Javeriana  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2007</year>
</pub-date>
<volume>33</volume>
<numero>2</numero>
<fpage>157</fpage>
<lpage>164</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-04882007000200012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-04882007000200012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-04882007000200012&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Buscando entender los diferentes patrones de variación estacional de la estructura trófica del ensamblaje de coleópteros, se realizó un trabajo en la Amazonia Colombiana, durante tres años consecutivos en época de lluvia y de sequía, en bosque de tierra firme y várzea. Se realizaron transectos donde se instalaron trampas: de caída, Corner, Winkler, Malaise y adicionalmente se realizaron capturas manuales y zarandeo. El material se identificó a nivel de familia. Se capturaron 3.691 individuos, correspondientes a 32 familias. Las familias más abundantes en número de individuos fueron Scolytidae (31,7%), Scarabaeidae (222%) y Staphylinidae (18,1%). Los xilomicetófagos (32,1%) fueron el grupo dominante, seguido por los copro-necrófagos (22,3%), depredadores (21,7%) y herbívoros (11%). Al comparar entre años y entre hábitats se encontraron diferencias en la abundancia y composición de las familias, así como en el aporte de los roles tróficos. La época seca demuestra una tendencia al empobrecimiento. La marcada variación espacial y temporal entre estaciones y entre años, se asocia a la alta diversidad y estaría apoyando la hipótesis que el recambio estaría jugando un importante papel en la dilución de la competencia interespecífica por el recurso.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[To understand the different patterns of seasonal variation in the trophic structure of coleopteran assemblages, a study was conducted in the Colombian Amazon, over three consecutive years in wet and dry seasons, in both tropical rain forest and floodplains. Transect sampling was carried out with pitfall, Corner, Winkler, and Malaise traps as well as manual capture. The material was identified to family level. A total of 3,691 individuals was captured, corresponding to 32 families. The families most abundant in numbers of individuals were Scolytidae (31.7%), Scarabaeidae (22.2%), and Staphylinidae (18.1%). The xilomycetophages (32.1%) were the dominant group, followed by the copro-necrophages (22.3%), predators (21.7%) and herbivores (11%). A comparison among years and habitats revealed differences in the abundance and composition of the families, as well as in the contribution of the trophic roles. The dry season shows a tendency to impoverishment. The marked spatial and temporal variation among seasons and years is associated with high diversity and would support the hypothesis that seasonality plays an important role in diluting interspecific competition for resources.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Rol Trófico]]></kwd>
<kwd lng="es"><![CDATA[Bosque Húmedo Tropical]]></kwd>
<kwd lng="es"><![CDATA[Várzea]]></kwd>
<kwd lng="es"><![CDATA[Xilómicetófagos]]></kwd>
<kwd lng="es"><![CDATA[Scolytidae]]></kwd>
<kwd lng="en"><![CDATA[Trophic role]]></kwd>
<kwd lng="en"><![CDATA[Tropical Rain Forest]]></kwd>
<kwd lng="en"><![CDATA[Floodplain]]></kwd>
<kwd lng="en"><![CDATA[Xilomycethophages]]></kwd>
<kwd lng="en"><![CDATA[Scolytidae]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="verdana"> <font size="2" face="verdana">     <p align="right"><b>Secci&oacute;n Morfolog&iacute;a, Comportamiento, Ecolog&iacute;a    y Sistem&aacute;tica</b></p></font>     <p align="CENTER">&nbsp;</p>     <p align="CENTER"><font size="4" face="verdana"><b>Din&aacute;mica estacional    de la estructura tr&oacute;fica de un ensamblaje de Coleoptera en la Amazonia    Colombiana</b></font></p>     <p align="CENTER"><b><font size="3" face="verdana">Seasonal dynamics of the trophic  structure of an assemblage of Coleoptera in the Colombian Amazon</font></b></p> <font size="2" face="verdana">     <p>&nbsp;</p>     <p><b>JORGE ARI NORIEGA A.<sup>1</sup>, JUAN PABLO BOTERO<sup>2</sup>, MARCELO  VIOLA<sup>2</sup>, GIOVANNY FAGUA<sup>1</sup></b></p> </font></font>    <p><font size="2">f</font><font size="2" face="verdana"><sup>1</sup> Unidad de Ecolog&iacute;a y Sistem&aacute;tica - UNESIS. Laboratorio de Entomolog&iacute;a. Pontificia Universidad Javeriana. Carrera 7a No. 40 - 62. Bogot&aacute;, Colombia. <a href="mailto:jnorieg@hotmail.com">jnorieg@hotmail.com</a></font></p> <font size="2" face="verdana"><font size="2" face="verdana">    <p><sup>2</sup> Estudiantes de Biolog&iacute;a. Pontificia Universidad Javeriana. Direcci&oacute;n correspondencia: Cra. 7 No. 113-51 apto. 502. Bogot&aacute; - Colombia.</p> <hr size="1"> </font>     <p><font size="3" face="verdana"><b>Resumen</b></font>:<font size="2" face="verdana"> Buscando entender los diferentes patrones de variaci&oacute;n estacional de la estructura tr&oacute;fica del ensamblaje de   cole&oacute;pteros, se realiz&oacute; un trabajo en la Amazonia Colombiana, durante tres a&ntilde;os consecutivos en &eacute;poca de lluvia y de   sequ&iacute;a, en bosque de tierra firme y v&aacute;rzea. Se realizaron transectos donde se instalaron trampas: de ca&iacute;da, Corner,   Winkler, Malaise y adicionalmente se realizaron capturas manuales y zarandeo. El material se identific&oacute; a nivel de   familia. Se capturaron 3.691 individuos, correspondientes a 32 familias. Las familias m&aacute;s abundantes en n&uacute;mero de   individuos fueron Scolytidae (31,7%), Scarabaeidae (222%) y Staphylinidae (18,1%). Los xilomicet&oacute;fagos (32,1%)   fueron el grupo dominante, seguido por los copro-necr&oacute;fagos (22,3%), depredadores (21,7%) y herb&iacute;voros (11%). Al   comparar entre a&ntilde;os y entre h&aacute;bitats se encontraron diferencias en la abundancia y composici&oacute;n de las familias, as&iacute; como   en el aporte de los roles tr&oacute;ficos. La &eacute;poca seca demuestra una tendencia al empobrecimiento. La marcada variaci&oacute;n   espacial y temporal entre estaciones y entre a&ntilde;os, se asocia a la alta diversidad y estar&iacute;a apoyando la hip&oacute;tesis que el recambio estar&iacute;a jugando un importante papel en la diluci&oacute;n de la competencia interespec&iacute;fica por el recurso.</font></p>      ]]></body>
<body><![CDATA[<p><font size="3" face="verdana"><b>Palabras clave</b>:</font><font size="3" face="verdana"></font><font size="2" face="verdana"> Rol Tr&oacute;fico. Bosque H&uacute;medo Tropical. V&aacute;rzea. Xil&oacute;micet&oacute;fagos. Scolytidae.</font></p> <font size="2" face="verdana"> <hr size="1"> </font>     <p><font size="3" face="verdana"><b>Abstract</b>: </font> <font size="2" face="verdana"> To understand the different patterns of seasonal variation in the trophic structure of coleopteran assemblages,     a study was conducted in the Colombian Amazon, over three consecutive years in wet and dry seasons, in both tropical     rain forest and floodplains. Transect sampling was carried out with pitfall, Corner, Winkler, and Malaise traps as well as     manual capture. The material was identified to family level. A total of 3,691 individuals was captured, corresponding to     32 families. The families most abundant in numbers of individuals were Scolytidae (31.7%), Scarabaeidae (22.2%), and     Staphylinidae (18.1%). The xilomycetophages (32.1%) were the dominant group, followed by the copro-necrophages     (22.3%), predators (21.7%) and herbivores (11%). A comparison among years and habitats revealed differences in the     abundance and composition of the families, as well as in the contribution of the trophic roles. The dry season shows a     tendency to impoverishment. The marked spatial and temporal variation among seasons and years is associated with high     diversity and would support the hypothesis that seasonality plays an important role in diluting interspecific competition for resources.</font></p> </font>     <p><font size="3" face="verdana"><b>Key words</b>: </font><font size="2" face="verdana">Trophic role. Tropical Rain Forest. Floodplain. Xilomycethophages. Scolytidae.</font></p> <font size="2" face="verdana"> <hr size="1">     <p><font size="3"><b>Introducci&oacute;n</b></font></p>     <p>El orden Coleoptera presenta m&aacute;s de 400 mil especies descritas,   las cuales se encuentran contenidas en cerca de 166 familias   (Lawrence y Newton 1995), encontr&aacute;ndose en todos los   ecosistemas y representando todos los roles tr&oacute;ficos (Crowson   1981). La mayor&iacute;a de los cole&oacute;pteros son considerados   fit&oacute;fagos, present&aacute;ndose algunos roles poco comunes y muy   especializados como los micet&oacute;fagos o los queratin&oacute;fagos   (Arnett y Thomas 2000). A ra&iacute;z de esta estrecha relaci&oacute;n con   algunos procesos al interior de los ecosistemas, muchas familias   de cole&oacute;pteros han sido utilizadas como bioindicadores (Brown   1991; Pearson 1994; Halffter y Favila 1993), demostrando su   importancia en planes de conservaci&oacute;n como herramientas de   monitoreo (Brown 1991; Kremen <i>et al</i>. 1993).</p>     <p>Trabajos realizados por Erwin (1982, 1983) en bosques   neotropicales, proponen la existencia de una alta riqueza, que   puede alcanzar el valor de ocho millones de especies de   cole&oacute;pteros. Adicionalmente a este valor hay que destacar la   fuerte din&aacute;mica temporal y espacial, la cual en ciertas   localidades puede ser marcada causando un importante   incremento en la riqueza local (Erwin y Scott 1981). El   conocimiento de esta din&aacute;mica estacional en un determinado   ecosistema puede ofrecer informaci&oacute;n importante para la   generaci&oacute;n de estrategias y planes de conservaci&oacute;n enfocados   a mantener la funcionalidad del mismo (Pimm 2002; Tilman y   Downing 1994; Naeem et al. 1995; Johnson <i>et al</i>. 1996).  </p>     <p>En este sentido son escasos los trabajos que han intentado   acercarse al estudio de la estructura temporal del ensamblaje   de cole&oacute;pteros (Elton 1973; Krasnov y Ayal 1995; Zerm y   Joachim 2001; Crouau-Roy et al. 1992; Blom et al. 2002),   especialmente al an&aacute;lisis del efecto que los roles tr&oacute;ficos tienen   en el funcionamiento de un ecosistema (Mikkelson 1993;   Lawton 1995; Escobar y Chac&oacute;n de Ulloa 2000; Paarmann et   al. 2001; Arias-D&iacute;az et al. 2007). Algunos trabajos muy   espec&iacute;ficos en la amazon&iacute;a, se han acercado al estudio de ciertas   variables pero en grupos delimitados (Klein 1989; Pearson y   Cassola 1992). El &uacute;nico trabajo que hasta la actualidad ha   estudiado la estructura tr&oacute;fica del ensamblaje de cole&oacute;pteros   en la regi&oacute;n amaz&oacute;nica (Brasil - Amazonia Central) es la   investigaci&oacute;n de Didham <i>et al</i>. (1998).</p>     <p>Desde mediados del siglo pasado diferentes investigadores   han mostrado un profundo inter&eacute;s en estudiar la variaci&oacute;n estacional en insectos (Davis 1945; Dobzhansky y Pavan 1950), a pesar de ello, la mayor&iacute;a de los trabajos en el caso especifico de los cole&oacute;pteros, solo han abarcado algunas pocas familias o se han centrado en aspectos comportamentales puntuales (New 1979; Krasnov y Shenbrot 1997; Yahiro y Yano 1997; G&ouml;k y Dur&aacute;n 2004; Boyer et al. 2003). Igualmente son pocos los trabajos realizados en la regi&oacute;n tropical: Africa (Paarmann 1979), las Antillas (Gruner 1975), M&eacute;xico (Montes de Oca y Halffter 1995), Costa Rica (Janzen 1983), Panam&aacute; (Wolda y Estribi 1985; Chandler y Wolda 1986), Ecuador (Peck y Forsyth 1982) y Brasil (Pinheiro et al. 2002).</p>     <p>Para el caso de Colombia y especialmente en la regi&oacute;n   amaz&oacute;nica, son pocos los estudios realizados acerca de la   din&aacute;mica de insectos y menos en el orden Coleoptera. Vale la   pena resaltar el trabajo efectuado por Howden y Nealis (1975)   en Leticia (Amazonas - Colombia), los cuales trabajaron &uacute;nicamente con la familia Scarabaeidae comparando los   cambios entre dos a&ntilde;os de muestreo y el trabajo de Mart&iacute;n   Piera y Fern&aacute;ndez (1996), quienes estudiaron la variaci&oacute;n   estacional de cole&oacute;pteros en la regi&oacute;n de Chiribiquete (Caquet&aacute;-   Colombia).</p>     <p>Todo esto demuestra la escasa informaci&oacute;n acumulada,   tanto de la composici&oacute;n y estructura, como de la din&aacute;mica   espacial y temporal de esta provincia biogeogr&aacute;fica en el pa&iacute;s,   m&aacute;s aun si se resalta que en ninguno de los trabajos   mencionados se ha incluido un an&aacute;lisis de la din&aacute;mica a nivel   de los roles tr&oacute;ficos, por todo lo anterior este estudio se   constituye en el primer trabajo de este tipo para la amazonia   colombiana, donde se presenta por primera vez el acumulado   de tres a&ntilde;os de muestreo consecutivo.</p>     ]]></body>
<body><![CDATA[<p><font size="3"><b>Materiales y M&eacute;todos</b></font></p>     <p><b>&Aacute;rea de estudio</b>. El trabajo se llev&oacute; a cabo en la Amazon&iacute;a   Colombiana, en la Comunidad Monifue Amena (Resguardo   Ind&iacute;gena Ticuna-Uitoto), a 71 msnm (4&deg;06&rsquo;46,25&rdquo;S -   69&deg;55&rsquo;52,11&rdquo;W), a 9,5 km de la ciudad de Leticia,   Departamento del Amazonas - Colombia (<a href="#fig1">Fig. 1</a>). En esta zona   se presenta un ciclo pluvial monomodal, con una &eacute;poca de   sequ&iacute;a de junio a octubre. El muestreo se llev&oacute; a cabo en dos   unidades de paisaje: Bosque de Tierra Firme (BTF) y Bosque   Inundable o V&aacute;rzea, en &eacute;poca de lluvias (marzo-mayo) y en   &eacute;poca seca (septiembre-octubre), durante tres a&ntilde;os consecutivos: 2002, 2003 y 2004.</p>     <p>    <center><a name="fig1"></a><img src="img/revistas/rcen/v33n2/v33n2a12fig1.gif"></center> </p>     <p><b>Muestreo</b>. Los muestreos se realizaron con diferentes m&eacute;todos   de captura: trampas Pitfall, trampas Winkler, trampas Malaise,   recolecci&oacute;n manual y zarandeo; usando 924 trampas Pitfall,   12 Malaise, 24 Winkler, para un total de 576 horas efectivas (<a href="#fig2">Fig. 2</a>).</p>     <p>    <center><a name="fig2"></a><img src="img/revistas/rcen/v33n2/v33n2a12fig2.gif"></center> </p>     <p>Cada uno de los muestreos tuvo un periodo de 48 horas   por trampa, para los dos h&aacute;bitats. En cada &eacute;poca se realiz&oacute; un   muestreo consistente en la instalaci&oacute;n de un promedio de 10   transectos (&plusmn; 1, el n&uacute;mero de transectos vari&oacute; debido al n&uacute;mero   de personas que asist&iacute;an a cada uno de los muestreos) de 100   m, separados 20 m, en cada uno de los dos tipos de bosques.   Sobre el transecto se colocaron 11 trampas tipo pitfall de 9   onzas, separadas 10 m entre s&iacute;, cebadas con salchich&oacute;n en   descomposici&oacute;n y con alcohol como liquido preservante. Para   cada unidad, adicionalmente se seleccion&oacute; un &aacute;rea de 2 x 2 m,   la cual fue muestreada por tres personas durante una hora con jam&aacute;s y pinzas.Los muestreos y la colocaci&oacute;n de las trampas   se hicieron en horas de la ma&ntilde;ana en BTF y en horas de la   tarde en varzea.</p>     <p>Cerca de cada transecto, se seleccionaron cuatro &aacute;rboles   con un di&aacute;metro a la altura del pecho (DAP) de 8 cm, en los   cuales se efectuaron tres episodios seguidos de zarandeo sobre   una sabana blanca, en donde se recolect&oacute; todo lo que ca&iacute;a. Al   final de tres transectos alternados a una distancia de 20 m se   tom&oacute; un m<sup>2</sup> de tierra para pasarlo por un saco Winkler, en cada   uno de los bosques. Finalmente en cada unidad de paisaje, a   un m&iacute;nimo de 50 m de los transectos, se coloc&oacute; una trampa   Malaise de 200 x 100 x 50 cm, rasante al piso, que permaneci&oacute; 48 horas activa.</p>     <p> <b>Identificaci&oacute;n taxon&oacute;mica</b>. Los ejemplares recolectados se   mantuvieron en etanol al 70%, posteriormente se realiz&oacute; un   montaje en seco, con alfileres entomol&oacute;gicos, montando un   ejemplar por cada morfotipo encontrado. Con el material   montado se realiz&oacute; la identificaci&oacute;n a nivel de familia,   utilizando claves generales y especializadas en este grupo   (Costa Lima 1952; White 1983; Papp 1984; Bland y Jaques   1978; Arnett y Thomas 2000; Borror et al. 1989; Arnett et al.   1980; Arnett et al. 2002). El material finalmente fue etiquetado   para ser depositado en la Colecci&oacute;n Entomol&oacute;gica del Museo   de la Pontificia Universidad Javeriana. Es importante anotar   que en el muestreo de la &eacute;poca de lluvias del 2003, se presento   una p&eacute;rdida de material, ocasionada por un mal transporte del mismo.</p>     ]]></body>
<body><![CDATA[<p><b>Asignaci&oacute;n de los grupos tr&oacute;ficos</b>. Para la caracterizaci&oacute;n de   los roles tr&oacute;ficos de cada una de las familias, se realiz&oacute; una   revisi&oacute;n de la informaci&oacute;n de historia de vida y tendencias   alimenticias a partir de diferentes trabajos (Crowson 1968,   1981; Paulian 1988; Lawrence y Newton 1995; Arnett y   Thomas 2000; Arnett <i>et al</i>. 2002). A ra&iacute;z de encontrar   discrepancias entre los diferentes autores, especialmente   relacionadas con variaciones tr&oacute;ficas al interior de algunas   familias, se lleg&oacute; a un consenso, tomando la tendencia general.</p>     <p><b>An&aacute;lisis estad&iacute;stico</b>. Se realiz&oacute; una prueba de ANOVA, para   determinar la existencia de diferencias significativas entre los   a&ntilde;os, entre las &eacute;pocas de muestreo, entre los h&aacute;bitats y la   combinaci&oacute;n entre ellos, por medio del programa STATISTICA   v. 6. Adicionalmente a esto, se calcul&oacute; el &Iacute;ndice de Similitud   entre a&ntilde;os, &eacute;pocas y unidades de paisaje, utilizando el &iacute;ndice   de Sorensen como la medida de distancia para definir la   similitud y como m&eacute;todo de uni&oacute;n de grupos el promedio entre   grupos (UPGMA). Para la ordenaci&oacute;n de los muestreos se   utilizo un An&aacute;lisis de Correspondencia Rectificado (DCA), para   evidenciar gr&aacute;ficamente la existencia de agrupamientos, por medio del programa PC-ORD v. 4.</p>     <p><font size="3"><b>Resultados</b></font></p>     <p><b>Abundancia y riqueza</b>. Se capturaron un total de 3.691   individuos, distribuidos en 32 familias (<a href="#anex1">Anexo 1</a>), de las cuales   las m&aacute;s abundantes fueron Scolytidae (31,7%), Scarabaeidae   (22,2%) y Staphylinidae (18,1%). Se encontraron familias con   h&aacute;bitos generalistas temporales, que fueron capturados durante   todos los a&ntilde;os independientemente de la &eacute;poca de muestreo,   tales como Scolytidae, Staphylinidae, Scarabaeidae, Carabidae   y Nitidulidae; especialistas espaciales que solo se encontraron   en BTF como Cicindelidae o Noteridae y familias raras de las   cuales solo se capturaron uno o dos individuos como   Buprestidae, Coccinelidae, Dermestidae, Meloidae,   Oedemeridae y Anobiidae, en un solo periodo y un h&aacute;bitat   espec&iacute;fico.</p>     <p>    <center><a name="anex1"></a><img src="img/revistas/rcen/v33n2/v33n2a12anex1.gif"></center> </p>     <p> El a&ntilde;o que mayor abundancia present&oacute; fue el 2003 con un   total de 1366 individuos (37,01%), seguido del 2002 (1247,   33,78%) y el 2004 (1078, 29,21%). Con respecto a la riqueza,   no se presentaron grandes diferencias en cuanto al n&uacute;mero de   familias; el promedio de familias fue de 24 para los tres a&ntilde;os,   siendo el 2002 el menor a&ntilde;o con 23 familias y el 2004 el mayor   con 25 familias. En cuanto a la abundancia se encontraron   diferencias significativas entre los tres a&ntilde;os (F = 0,987; P &lt;   0,009).</p>     <p>Hubo mayor abundancia en la &eacute;poca de lluvias (2085,   56,49%), que en la &eacute;poca de sequ&iacute;a (1606, 43,51%), a   excepci&oacute;n de lo encontrado en el a&ntilde;o 2003 donde esta relaci&oacute;n   se invirti&oacute; (<a href="#fig3">Fig. 3</a>). Con respecto al n&uacute;mero de familias, se   present&oacute; una tendencia a aumentar en &eacute;poca seca (<a href="#fig3">Fig. 3</a>) y en   el h&aacute;bitat BTF (<a href="#fig4">Fig. 4</a>). El porcentaje total de individuos fue   mayor en BTF (2423, 65,9%) que en V&aacute;rzea (1259, 34,1%),   mostrando una tendencia a mantener la proporci&oacute;n a lo largo   de los diferentes muestreos (Fig. 3). Se encontraron diferencias   significativas entre las abundancias y las riquezas de los dos   h&aacute;bitats (F = 0,984; P &lt; 0,003), as&iacute; como entre las &eacute;pocas al   interior de los a&ntilde;os (F = 0,987; P &lt; 0,001).  </p>     <p>    <center><a name="fig3"></a><img src="img/revistas/rcen/v33n2/v33n2a12fig3.gif"></center> </p>     ]]></body>
<body><![CDATA[<p>    <center><a name="fig4"></a><img src="img/revistas/rcen/v33n2/v33n2a12fig4.gif"></center> </p>     <p>No se encontraron diferencias significativas entre las &eacute;pocas   de mayor o menor precipitaci&oacute;n; entre los h&aacute;bitats al interior   de cada a&ntilde;o y entre los h&aacute;bitats y las &eacute;pocas. El an&aacute;lisis de   similitud muestra una relaci&oacute;n (&gt; 85%) entre las &eacute;pocas de   lluvias de los a&ntilde;os 2003 y 2004, independientemente de la   unidad de paisaje y tambi&eacute;n una relaci&oacute;n (90%) entre las   unidades de paisaje durante la &eacute;poca de lluvias del a&ntilde;o 2002. El an&aacute;lisis de correspondencia tiende a agrupar los muestreos por a&ntilde;os y dentro de estos por unidad de paisaje (<a href="#fig5">Fig. 5</a>).</p>     <p>    <center><a name="fig5"></a><img src="img/revistas/rcen/v33n2/v33n2a12fig5.gif"></center> </p>     <p><b>Estructura tr&oacute;fica</b>. Se establecieron ocho roles tr&oacute;ficos a partir   de las familias recolectadas, dentro de los cuales el que present&oacute;   mayor abundancia correspondi&oacute; a los xilomicet&oacute;fagos (32,1%),   seguido por los copro-necr&oacute;fagos (22,3%) y los depredadores   (21,7%), mientras el resto de roles presentaron n&uacute;meros bajos   de individuos (<a href="#fig6">Fig. 6</a>A). Con respecto a la riqueza de familias   se encontraron valores diferentes reflejando una composici&oacute;n   no consistente con la abundancia; el rol que mayor n&uacute;mero de   familias present&oacute; fue el herb&iacute;voro con 13 (40,6%), seguido   por los depredadores con ocho (25%) y los sapr&oacute;fagos con   cuatro (12,5%), mientras el resto de roles presentaron un   n&uacute;mero bajo de familias (<a href="#fig6">Fig. 6</a>B). No se presentaron familias con h&aacute;bitos parasitoides.</p>     <p>    <center><a name="fig6"></a><img src="img/revistas/rcen/v33n2/v33n2a12fig6.gif"></center> </p>     <p><b>Estacionalidad   Abundancia y Riqueza</b>. En cuanto a la variaci&oacute;n de la   abundancia por &eacute;poca/a&ntilde;o, se observaron cambios en la   proporci&oacute;n para el a&ntilde;o 2002 y 2004 donde se present&oacute; una   mayor abundancia de individuos en la &eacute;poca de lluvias que en   la &eacute;poca seca, mientras que para el muestreo del a&ntilde;o 2003 la   relaci&oacute;n se invierte (<a href="#fig3">Fig. 3</a>). Para la variaci&oacute;n estacional de la   abundancia por unidad de paisaje/a&ntilde;o no se presentan   variaciones importantes; para los tres a&ntilde;os de muestreo BTF   siempre presenta una mayor abundancia de individuos que   V&aacute;rzea (<a href="#fig4">Fig. 4</a>).</p>     <p>En la variaci&oacute;n en la riqueza de familias por unidad de   paisaje/a&ntilde;o, BTF presenta una mayor riqueza de familias que   V&aacute;rzea (<a href="#fig4">Fig. 4</a>), mientras en el caso de las &eacute;pocas de mayor   precipitaci&oacute;n no se present&oacute; un patr&oacute;n evidente (<a href="#fig3">Fig. 3</a>).</p>     ]]></body>
<body><![CDATA[<p><b>Roles tr&oacute;ficos</b>.En cuanto a los roles tr&oacute;ficos y la estacionalidad,   se observaron algunos cambios importantes entre   los muestreos; para algunos roles como los xilomicet&oacute;fagos y   los copro-necr&oacute;fagos se observ&oacute; una marcada estacionalidad,   mientras que para los dem&aacute;s roles los valores de abundancia   fueron relativamente constantes (<a href="#fig7">Fig. 7</a>). Los roles raros como   queratin&oacute;fagos, xil&oacute;fagos y micet&oacute;fagos desaparecen para   algunos muestreos, especialmente en el 2003 y en la &eacute;poca de lluvias (<a href="#fig7">Fig. 7</a>).</p>     <p>    <center><a name="fig7"></a><img src="img/revistas/rcen/v33n2/v33n2a12fig7.gif"></center> </p>     <p><font size="3"><b>Discusi&oacute;n</b></font></p>     <p>Los resultados concuerdan con varios estudios que evidencian   una marcada estacionalidad de muchos grupos de insectos,   especialmente en el caso de los cole&oacute;pteros (Wolda 1978;   Janzen 1983; Wolda 1988; Chandler y Wolda 1986; Montes   de Oca y Halffter 1995), pero adicionalmente plantea que la   estacionalidad no solo est&aacute; relacionada con la abundancia y   riqueza de los ensamblajes sino con la funcionalidad de los   mismos. Al presentarse cambios en la estructura tr&oacute;fica, es de   esperar que determinados procesos funcionales se vean   afectados de igual manera (Didham et al. 1998; Boyer et al.   2003).</p>     <p>La mayor abundancia de los individuos en la &eacute;poca de   lluvias puede estar relacionada con una mayor oferta de recursos a nivel cualitativo y cuantitativo, que genera una mejor   disponibilidad espacio-temporal (Huston 1996). De igual forma   las condiciones clim&aacute;ticas son m&aacute;s favorables, como se   demuestra en algunos estudios a nivel neotropical (Lauer 1992;   Losos y CTFS Working Group 2004). Adicionalmente, otro   factor que podr&iacute;a influir es la agregaci&oacute;n espacial que se   produce en &eacute;poca seca de ciertos recursos, lo cual aumentar&iacute;a   la competencia interespecifica (Foster 1996). A todo lo anterior   hay que agregar la existencia de recursos espec&iacute;ficos que solo aparecen en &eacute;poca de lluvias, presentando una marcada   estacionalidad y condicionando a las especies que han   establecido relaciones estrechas a mantener estos mismos ciclos   (Garwood 1996; Leigh y Windsor 1996).  </p>     <p>Adis (1988) reporta una fuerte estacionalidad para los   bosques de la amazon&iacute;a central en Brasil, donde algunas   familias de cole&oacute;pteros aparecen solo en una determinada &eacute;poca del a&ntilde;o, similar a lo encontrado en este estudio. Aunque   algunos trabajos han arrojado una mayor riqueza y abundancia   en &eacute;poca seca (Watanabe y Ruaysoongnerm 1989), es evidente   que para el caso del neotr&oacute;pico y los bosques de la amazonia   la mayor abundancia y riqueza est&aacute;n estrechamente asociadas   con la llegada de las lluvias (Holt y Spain 1986; Frith y Frith   1990; Krasnov y Shenbrot 1997; G&ouml;k y Dur&aacute;n 2004; Boyer et   al. 2003).  </p>     <p>La baja riqueza de familias en la &eacute;poca seca puede estar   obedeciendo a diversos factores como la existencia de grupos especializados a estas condiciones o a recursos espec&iacute;ficos de   esta &eacute;poca (Losos 2004; Levings y Windsor 1996). Tambi&eacute;n es   posible considerar que las familias que aparecen en esta &eacute;poca   sean malas competidoras, las cuales estar&iacute;an optando por una   estrategia suboptima en una &eacute;poca m&aacute;s dif&iacute;cil, pero con una   menor competencia. Es interesante anotar que las familias   presentes en esta &eacute;poca son herb&iacute;voras, benefici&aacute;ndose del estr&eacute;s   h&iacute;drico que podr&iacute;a disminuir los mecanismos de defensa de   algunas plantas (Waterman y McKey 1992), d&aacute;ndoles una ventaja   sobre la calidad del recurso existente, aumentando la diversidad,   pero manteniendo poblaciones bajas.  </p>     <p>Las diferencias encontradas en el n&uacute;mero de familias e   individuos entre BTF y V&aacute;rzea, responden a una mayor   complejidad estructural a nivel vegetal presente en BTF   (Duivenvoorden 1996), lo cual genera no solo una mayor   cantidad y diversidad de recursos, sino microh&aacute;bitats   potenciales, en donde por ejemplo las presas pueden escapar   de los depredadores (Prance 1992; Huston 1996; Losos y CTFS   Working Group 2004). Es importante mencionar que el &aacute;rea   de cobertura de BTF es mucho mayor que el &aacute;rea de la V&aacute;rzea,   lo cual puede llegar a afectar los valores encontrados,   especialmente en el caso de las abundancias totales por h&aacute;bitat. Algunos trabajos han evidenciado que tanto la composici&oacute;n   vegetal del bosque como la composici&oacute;n de los artr&oacute;podos   puede verse afectada por las inundaciones (Beck 1972; Gasdorf   y Goodnight 1963; Uetz et al. 1979), como se reporta para   este estudio. A pesar de ello, algunas especies pueden escapar   a las inundaciones, por medio de migraciones verticales,   sobreviviendo debajo del agua, o coordinando sus ciclos para   reproducirse cuando el suelo est&aacute; seco (Irmler 1979; Paarmann   1982; Adis 1988). Tambi&eacute;n es posible que se presenten   migraciones de V&aacute;rzea a BTF en la &eacute;poca de inundaciones   (Uetz et al. 1979).  </p>     <p>Mientras menor sea la inundaci&oacute;n y entre menos eventos   de inundaci&oacute;n existan en el a&ntilde;o, mayor es la riqueza encontrada,   por lo que los valores de riqueza fluctuar&iacute;an m&aacute;s en zonas con   fuertes inundaciones peri&oacute;dicas (Uetz et al. 1979). Algunas   especies y familias pueden estar coordinadas con el inicio de   la &eacute;poca de lluvias (Morais 1985; Adis 1988), mientras que   otras pueden presentar rangos m&aacute;s amplios, especialmente   aquellas especies con una alta capacidad de desplazamiento   (Uetz et al. 1979), como suceder&iacute;a en este estudio con la familia   Scarabaeidae.</p>     ]]></body>
<body><![CDATA[<p>Aunque algunos autores proponen que la presencia de   disturbios intermedios peri&oacute;dicos puede aumentar la diversidad   de un lugar (Connell y Slatyer 1977), la existencia de periodos   de inundaci&oacute;n en la V&aacute;rzea, es sin duda un evento que impide   su utilizaci&oacute;n por parte de los insectos, ya que son pocos los   grupos que pueden adaptarse a este r&eacute;gimen, lo cual explicar&iacute;a   porqu&eacute; la diversidad disminuye dr&aacute;sticamente en esta &eacute;poca   (Uetz et al. 1979). Las diferencias entre a&ntilde;os podr&iacute;an atribuirse   a variaciones clim&aacute;ticas, tanto por desplazamiento de los   periodos de lluvias, como por la intensidad de los mismos   (Lauer 1992). De igual manera, aunque los muestreos se   realizaron en las mismas &aacute;reas, variaciones en la ubicaci&oacute;n   microespacial del muestreo pueden afectar la abundancia y   riqueza de lo capturado (Melbourne 1999).</p>     <p>Otro aspecto que puede estar afectando las variaciones entre   los a&ntilde;os, es la existencia de ciclos ambientales o biol&oacute;gicos   que trascienden la temporalidad anual, presentando intervalos   m&aacute;s amplios de los tres a&ntilde;os de muestreo. Igualmente es posible   que con las fuertes din&aacute;micas existentes en los bosques   neotropicales (Losos y CTFS Working Group 2004; Leigh et   al. 1996; Vallego et al. 1996), se hayan muestreado ensamblajes   diferentes, tanto por la escogencia de microh&aacute;bitats diferentes,   como por eventos aleatorios que ocasionen una mayor   heterogeneidad al interior de cada a&ntilde;o.</p>     <p>En relaci&oacute;n con los roles tr&oacute;ficos, se ha evidenciado una   marcada estacionalidad de diferentes recursos (Leigh y   Windsor 1996), como es el caso de la hojarasca y la madera,   recursos que son m&aacute;s f&aacute;ciles de degradar en &eacute;poca h&uacute;meda   por hongos, mientras que en &eacute;poca seca los xil&oacute;fagos y   xilomicetofagos pueden dominar el recurso, generando una   fuerte competencia y una din&aacute;mica marcada entre estos dos   grupos (Bagyaray 1992; Brokaw 1996; Esser y Lieth 1992;   Swift y Anderson 1992). En este sentido el rol menos afectado   por la precipitaci&oacute;n ser&iacute;a el de los depredadores, aunque a nivel   general en &eacute;poca seca la mayor&iacute;a de los roles disminuyen por   la falta de una humedad adecuada para llevar a cabo algunas   funciones, como en el caso de los copr&oacute;fagos donde el   excremento llega a ser inutilizable (Cambefort y Hanski 1991).</p>     <p>Existe un mayor n&uacute;mero de individuos asociados a aquellos   recursos que presentan mayor abundancia, por lo que los   recursos ef&iacute;meros en espacio y tiempo, presentan una mayor   cantidad de roles pero pocos individuos (Hanski 1990; Hanski y Cambefort 1991). En este sentido podr&iacute;a pensarse que los   roles dominantes, que no desaparecen en el tiempo, tienen una   mayor importancia para el constante funcionamiento del   ecosistema, aunque la desaparici&oacute;n de roles no tan comunes,   podr&iacute;a afectar los procesos en una escala temporal a largo plazo.</p>     <p>Aquellos roles tr&oacute;ficos raros o asociados a recursos poco   abundantes, tendr&iacute;an una mayor posibilidad de presentar   extinciones locales al ser m&aacute;s susceptibles (Larsen et al. 2005),   por lo que deber&iacute;an ser grupos bandera en estrategias de   conservaci&oacute;n. Algo similar estar&iacute;a sucediendo con niveles   tr&oacute;ficos superiores, los cuales presentan una mayor   susceptibilidad a la extinci&oacute;n que grupos basales (Holt 1996).   En este sentido debe plantearse el uso de especies funcionales,   que aporten informaci&oacute;n m&aacute;s completa sobre el estado de   conservaci&oacute;n de un h&aacute;bitat, ya que es posible que ciertas   especies aparezcan o desaparezcan, sin afectar el equilibrio   funcional, pero la desaparici&oacute;n de un rol puede ocasionar   cambios en el ecosistema. Como propone Didham et al. (1998)   los depredadores son un grupo que se incrementa con eventos de disturbio, siendo un interesante grupo de monitoreo.</p>     <p><b>Lineamientos de investigaci&oacute;n</b>. Es importante corroborar los   resultados con otros grupos megadiversos como himen&oacute;pteros,   donde se puedan establecer roles tr&oacute;ficos semejantes, as&iacute; como   replicar este estudio a diferentes rangos latitudinales donde se   comparen los resultados. Se sugiere igualmente el tener   unidades de muestreo m&aacute;s espec&iacute;ficas en el tiempo, realizando   recolecciones mensuales, con el objetivo de verificar si las   variaciones entre cada uno de los periodos escogidos obedecen   a patrones generales o son eventos puntuales.  </p>     <p>Deben seguirse acumulando datos de esta localidad, con el     fin de poder detectar cambios a una escala temporal mayor. Otro aspecto que podr&iacute;a tenerse en cuenta es la asignaci&oacute;n   m&aacute;s espec&iacute;fica de los roles tr&oacute;ficos, ya que en algunos grupos   es algo general, present&aacute;ndose variaciones a nivel especifico   como es el caso de Staphylinidae, Curculionidae y Tenebrionidae,   por lo que en un an&aacute;lisis m&aacute;s detallado (morfoespecies,   g&eacute;neros o especies) podr&iacute;an evidenciarse cambios   m&aacute;s sutiles en las din&aacute;micas estacionales.</p>     <p>Se recomienda incluir otros microhabitats no muestreados,   que podr&iacute;an estar albergando otra fauna, especialmente en la   &eacute;poca de verano, como es el caso de las bromelias (Paoleiti et   al. 1991), o del dosel, donde se ha demostrado su importante   aporte a la estructura del ensamblaje (Erwin 1983; Watanabe   y Ruaysoongnerm 1989, Lowman et al. 1996). Igualmente se   deber&iacute;an incluir otras &aacute;reas de muestreo como la Chagra, donde   las din&aacute;micas estacionales pueden diferir e implementar otros m&eacute;todos de captura no utilizados.</p>     <p>Finalmente este estudio demuestra que existe una fuerte   din&aacute;mica estacional en la riqueza de las familias encontradas,   lo cual puede estar muy relacionado con la din&aacute;mica propia de   los recursos o con un mecanismo de diluci&oacute;n de la competencia.   A pesar de presentarse esta fuerte din&aacute;mica estacional, la   estructura de los roles tr&oacute;ficos se mantiene relativamente   estable, lo cual est&aacute; se&ntilde;alando la importancia de la regulaci&oacute;n   de los mismos con respecto a la funcionalidad de un ecosistema;   a pesar de aparecer y desaparecer diferentes familias del   ensamblaje, siguen existiendo familias que cumplen con los   roles necesarios para mantener esta funcionalidad en el ecosistema.</p>     <p><font size="3"><b>Agradecimientos</b></font></p>     ]]></body>
<body><![CDATA[<p>A todos los estudiantes que contribuyeron en el trabajo de   campo, durante los tres a&ntilde;os de muestreo. A la comunidad   ind&iacute;gena Monifue-Amena por la hospitalidad brindada durante   la elaboraci&oacute;n de los muestreos. A dos revisores an&oacute;nimos y al   editor de la revista por todos sus comentarios y aportes los   cuales fueron sumamente valiosos para mejorar la calidad del   manuscrito. Este trabajo se realiz&oacute; bajo el convenio No. 1662,   entre CorpoAmazon&iacute;a, Comunidad Monifue-Amena y Pontificia Universidad Javeriana.</p>     <p><font size="3"><b>Literatura Citada</b></font></p>     <!-- ref --><p>ADIS, J. 1988. Comparative ecological studies of the terrestrial arthropod   fauna in central Amazonian inundation forests. 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