{"id":86482,"date":"2018-03-10T00:11:03","date_gmt":"2018-03-10T00:11:03","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/ecologa%c2%ada-de-la-culebra-viperina-natrix-maura-linnaeus-1758-en-el-delta-del-ebro\/"},"modified":"2018-03-10T00:11:03","modified_gmt":"2018-03-10T00:11:03","slug":"ecologa%c2%ada-de-la-culebra-viperina-natrix-maura-linnaeus-1758-en-el-delta-del-ebro","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ciencias-de-la-vida\/ecologa%c2%ada-de-la-culebra-viperina-natrix-maura-linnaeus-1758-en-el-delta-del-ebro\/","title":{"rendered":"Ecolog\u00eda de la culebra viperina, natrix maura (linnaeus, 1758), en el delta del ebro"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Xavier Santos Santir\u00f3 <\/strong><\/h2>\n<p>El delta del ebro es un ecosistema caracterizado por la existencia de una extensa superficie dedicada al cultivo de arroz. Entre sus diversa fauna, destaca la presencia de una poblaci\u00f3n de culebras viperinas (natrix maura). En este estudio se analiza la influencia del ciclo del cultivo del arroz, basado en variaciones bruscas del nivel del agua, sobre la biolog\u00eda de esta culebra de agua.  en relaci\u00f3n a la reproducci\u00f3n, los machos presentan una espermatog\u00e9nesis postnucial y las hembras una vitelog\u00e9nesis prenupcial, con un per\u00edodo de gravidez de mayo a agosto. En las hembras, los cuerpo grasos se reducen durante la vitelog\u00e9nesis y en los machos, tanto las c\u00f3pulas como la espermatog\u00e9nesis suponen un gasto energ\u00e9tico. En relaci\u00f3n a otras poblaciones de natrix maura, la fenolog\u00eda de la poblaci\u00f3n deltaica muestra un retraso de un mes. en abril las condiciones ambientales son buenas y las serpientes est\u00e1n activas, pero los arrozales est\u00e1n secos y el alimento es escaso. As\u00ed, las reservas de grasa en abril se reducen mucho y por ello las hembras no inician la vitelog\u00e9nesis hasta que aumentan sus reservas un mes m\u00e1s tarde, coincidiendo con un incremento del alimento disponible. Los cuerpos grasos son el dep\u00f3sito corporal m\u00e1s grande de l\u00edpidos, pero en h\u00edgado son abundantes en las hembras gr\u00e1vidas ya que almacenan vitelogenina.  la dieta de la culebra viperina se compone de ranas verdes (adultos y larvas), carpas y gambusias. Las culebras adultas consumen m\u00e1s ranas que los inmaduros y no consumen gambusias. Entre sexos, los machos consumen mayor n\u00famero de presas pero m\u00e1s peque\u00f1as, que las hembras. Todo ello sugiere el uso de diferentes recursos tr\u00f3ficos en relaci\u00f3n al tama\u00f1o de las culebras, las necesidades energ\u00e9ticas, etc.  entre los microh\u00e1bitats m\u00e1s usados destacan el agua, los pl\u00e1sticos y las piedras. En primavera, ocupan principalmente el agua, pero tambi\u00e9n se localizan bajo pl\u00e1sticos, mientras que en ver<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Ecolog\u00eda de la culebra viperina, natrix maura (linnaeus, 1758), en el delta del ebro<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Ecolog\u00eda de la culebra viperina, natrix maura (linnaeus, 1758), en el delta del ebro <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Xavier Santos Santir\u00f3 <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Barcelona<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 22\/09\/2000<\/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>Gustavo Adolfo Llorente Cabrera<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: jacinto Nadal puigdefabregas <\/li>\n<li>Juan  Manuel Pleguezuelos gomez (vocal)<\/li>\n<li>marc Cheylan (vocal)<\/li>\n<li>pedro Manuel Gal\u00e1n regalado (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Xavier Santos Santir\u00f3 El delta del ebro es un ecosistema caracterizado por la existencia de una extensa [&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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