{"id":17908,"date":"2018-03-09T09:06:12","date_gmt":"2018-03-09T09:06:12","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/edad-y-reproduccion-en-el-milano-negro-milvus-migrans\/"},"modified":"2018-03-09T09:06:12","modified_gmt":"2018-03-09T09:06:12","slug":"edad-y-reproduccion-en-el-milano-negro-milvus-migrans","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ciencias-de-la-vida\/edad-y-reproduccion-en-el-milano-negro-milvus-migrans\/","title":{"rendered":"Edad y reproducci\u00f3n en el milano negro (milvus migrans)"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Julio Blas Garc\u00eda <\/strong><\/h2>\n<p>Se estudiaron los patrones y mecanismos que generan tasas de reproducci\u00f3n dependientes de la edad en aves, utilizando como modelo la poblaci\u00f3n de milano negro (milvus migrans) que se reproduce en las marismas del guadalquivir (do\u00f1ana). El seguimiento cient\u00edfico de esta poblaci\u00f3n (manteniendo durante el periodo 1986-2000) revel\u00f3 que la primera reproducci\u00f3n sucede al tercer a\u00f1o de edad por t\u00e9rmino medio, y se retrasa hasta los 7 a\u00f1os en los casos extremos. Adem\u00e1s, el \u00e9xito de los reproductores aument\u00f3 gradulamente entre 2 y 11 a\u00f1os de edad, y diminuy\u00f3 a continuaci\u00f3n.  los aumentos graduales de productividad fueron consistentes con la hip\u00f3tesis de la selecci\u00f3n (desaparici\u00f3n de los peores reproductores), y con la existencia de mejoras a nivel del individuo, relacionadas tanto de su edad cronol\u00f3gica como con su experiencia reproductiva previa.  las fechas de retorno migratorio prenupcial se adelantaron con la edad, y aunque los individuos j\u00f3venes de 1-2 a\u00f1os retomaron consistentemente m\u00e1s tarde, su menor eficiencia migratoria no explic\u00f3 por s\u00ed sola los retrasos en la edad de primera reproducci\u00f3n.  los j\u00f3venes no reproductores mostraron valores de condici\u00f3n corporal (estimada mediante residuos de peso sobre talla, y mediante el an\u00e1lisis de la bioqu\u00edmica plasm\u00e1tica) superiores a los observados en aves reproductoras, sugiriendo que \u00e9ste car\u00e1cter no es el mecanismo responsable de la reproducci\u00f3n retrasada.  con relaci\u00f3n a la fisiolog\u00eda endocrina, la concentraci\u00f3n de testosterona circulante en los machos, se mostr\u00f3 elevada durante los periodos sexuales de ciclo reproductor, y no se detectaron diferencias ligadas al estatus o la edad de los individuos. Adem\u00e1s, la secreci\u00f3n de testosterona en respuesta al tratamiento con hormona gnrh fue similar en machos reproductores y flotantes, sugiriendo que la madurez sexual no impide la reproducci\u00f3n de los juveniles. las hembras, mostraron concentraciones de estradio<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Edad y reproducci\u00f3n en el milano negro (milvus migrans)<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Edad y reproducci\u00f3n en el milano negro (milvus migrans) <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Julio Blas Garc\u00eda <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Aut\u00f3noma de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 28\/06\/2002<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Fernando Hiraldo Cano<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Francisco Suarez cardona <\/li>\n<li>guillermo Blanco hervas (vocal)<\/li>\n<li>Jos\u00e9 Luis Tella escobedo (vocal)<\/li>\n<li> Negro balsameda Juan  Jos\u00e9 (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Julio Blas Garc\u00eda Se estudiaron los patrones y mecanismos que generan tasas de reproducci\u00f3n dependientes de la [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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