{"id":57178,"date":"2018-03-09T22:44:58","date_gmt":"2018-03-09T22:44:58","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/magnitude-of-herbivory-in-posidonia-oceanica-and-factors-responsible-for-spatial-variation\/"},"modified":"2018-03-09T22:44:58","modified_gmt":"2018-03-09T22:44:58","slug":"magnitude-of-herbivory-in-posidonia-oceanica-and-factors-responsible-for-spatial-variation","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ciencias-de-la-vida\/magnitude-of-herbivory-in-posidonia-oceanica-and-factors-responsible-for-spatial-variation\/","title":{"rendered":"Magnitude of herbivory in posidonia oceanica and factors responsible for spatial variation"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Patricia Prado Villegas <\/strong><\/h2>\n<p>La reevaluaci\u00f3n a gran escala espacial (menor de 300 km) y mediante m\u00e9todos de cuantificaci\u00f3n directa, del impacto del herbivor\u00edsmo en los ecosistemas de posidonia oce\u00e1nica revela p\u00e9rdidas de biomasa foliar muy superiores a anteriores estimas basadas en m\u00e9todos indirectos (i.E., Frecuencia de marcas de acci\u00f3n).  en un promedio anual, los herb\u00edvoros causan la p\u00e9rdida de aproximaci\u00f3n el 57% de la producci\u00f3n foiliar, si bien existen grandes diferencias estacionales y las mayores presiones se producen durante el periodo estival. El pez sarpa salpa se erige como el herb\u00edvoro principal, con unas tasas de defoliaci\u00f3n de ca. 40% de la producci\u00f3n foliar anula (70% del herbivor\u00edsmo) seguido por el erizo del mar paracentrotus lividus (17% de la producci\u00f3n foliar y 30% del herbivor\u00edsmo). No obstante, se detecta tambi\u00e9n la existencia de una gran variabilidad espacial, con valores de presi\u00f3n de herbivor\u00edsmo que fluct\u00faan entre el 23 y m\u00e1s del 85% de la producci\u00f3n foliar en funci\u00f3n de la localidad. Entre los factores causantes de tales diferencias, la pesca y la disponibilidad de p.Oceanica como h\u00e1bitat y como recurso de alimentaci\u00f3n, fueron identificados como los m\u00e1s influyentes en la estructura poblacional de s.Salpa. El efecto de la presi\u00f3n pesquera resulta en una disminuci\u00f3n del n\u00famero de individuos y por tanto de la presi\u00f3n de herbivor\u00edsmo. Por el contrario, el efecto de la disponibilidad de p.Oceanica dentro de la extensi\u00f3n territorial de s.Salpa, causa su concentraci\u00f3n sobre el recurso, y por tanto, el incremento de la presi\u00f3n deherbivor\u00edsmo. Por lo que respecta al erizo de mar p.Lividus, el aporte de nuevos individuos a la poblaci\u00f3n se produce por dos proceso fundamental: la migraci\u00f3n desde el substrato rocoso en contacto con la pradera y al disponibilidad de estructura de mata del rizoma de p.Oceanica como elemento vinculado al refugio y\/o alimentaci\u00f3n de los estadios tempranos de esta especie y sin la cual no se detecta reclutamien<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Magnitude of herbivory in posidonia oceanica and factors responsible for spatial variation<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Magnitude of herbivory in posidonia oceanica and factors responsible for spatial variation <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Patricia Prado Villegas <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Barcelona<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 23\/02\/2007<\/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>Teresa Alcoverro  Pedrola<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: fran\u00ed\u00a7ois Boudouresque charles <\/li>\n<li>Jos\u00e9 lu\u00eds S\u00e1nchez lizaso (vocal)<\/li>\n<li>francesc xavier Turon barrera (vocal)<\/li>\n<li>enric Ballesteros sagarra (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Patricia Prado Villegas La reevaluaci\u00f3n a gran escala espacial (menor de 300 km) y mediante m\u00e9todos de [&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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