{"id":74388,"date":"2021-10-19T19:00:00","date_gmt":"2021-10-19T22:00:00","guid":{"rendered":"http:\/\/patagoniambiental.com.ar\/info\/?p=74388"},"modified":"2021-10-19T18:46:01","modified_gmt":"2021-10-19T21:46:01","slug":"la-ballena-franca-austral-bajo-amenaza-por-el-calentamiento-de-los-oceanos","status":"publish","type":"post","link":"https:\/\/patagoniambiental.com.ar\/info\/la-ballena-franca-austral-bajo-amenaza-por-el-calentamiento-de-los-oceanos\/","title":{"rendered":"La ballena franca austral, bajo amenaza por el calentamiento de los oc\u00e9anos"},"content":{"rendered":"\n<!--more-->\n\n\n\n<p>Un estudio observ\u00f3 que la supervivencia de las hembras en etapa reproductiva est\u00e1 amenazadapor la disminuci\u00f3n del krill ant\u00e1rtico, su principal alimento. \u00abLuego de intensos eventos de El Ni\u00f1o, un alto porcentaje de hembras identificadas no volvieron a ser vistas\u00bb, detallaron.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.unidiversidad.com.ar\/cache\/ballena-franca-austral_1000_1100.jpg\" alt=\"La ballena franca austral, bajo amenaza por el calentamiento de los oc\u00e9anos\"\/><\/figure>\n\n\n\n<p>Foto: T\u00e9lam<\/p>\n\n\n\n<p><a href=\"https:\/\/www.unidiversidad.com.ar\/categorias\/index\/medio-ambiente\">MEDIO AMBIENTE<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.unidiversidad.com.ar\/categorias\/index\/medio-ambiente-tema\">MEDIO AMBIENTE<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.unidiversidad.com.ar\/tipo\/index\/Novedad\">UNIDIVERSIDAD<\/a><\/p>\n\n\n\n<p>Unidiversidad<\/p>\n\n\n\n<p>Publicado el&nbsp;19 de octubre de 2021<\/p>\n\n\n\n<p>Un reciente estudio describe por primera vez el&nbsp;<strong>efecto del cambio clim\u00e1tico sobre la supervivencia de las hembras de ballena franca austral en etapa reproductiva<\/strong>&nbsp;por la disminuci\u00f3n del krill ant\u00e1rtico, su principal alimento. \u00abAnalizando cinco d\u00e9cadas de datos de fotoidentificaci\u00f3n de&nbsp;<strong>ballenas francas australes<\/strong>&nbsp;de Pen\u00ednsula Vald\u00e9s, investigadores del Instituto de Conservaci\u00f3n de Ballenas (ICB), Ocean Alliance y un equipo internacional de colaboradores describieron por primera vez el efecto del cambio clim\u00e1tico sobre la supervivencia de las hembras de la especie\u00bb, dice el informe.<\/p>\n\n\n\n<p>Seg\u00fan la reciente publicaci\u00f3n en la p\u00e1gina oficial del ICB,<strong>&nbsp;\u00abla mortalidad aumenta luego de eventos de El Ni\u00f1o, pudiendo retrasar o incluso impedir la recuperaci\u00f3n de las poblaciones\u00bb.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.unidiversidad.com.ar\/cache\/humedales2_300_650_c.jpg\" alt=\"Argentina, entre los 30 pa\u00edses clave para recuperar la biodiversidad del planeta\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/www.unidiversidad.com.ar\/argentina-entre-los-30-paises-clave-para-recuperar-la-biodiversidad-del-planeta\">Argentina, entre los 30 pa\u00edses clave para recuperar la biodiversidad del planeta<\/a><\/h3>\n\n\n\n<p><a href=\"https:\/\/www.unidiversidad.com.ar\/categorias\/index\/medio-ambiente\">MEDIO AMBIENTE<\/a><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Ocurre que, luego de amamantar a sus cr\u00edas durante algunos meses, las ballenas pierden al menos el 25 % de su volumen corporal y necesitan recuperarlo con grandes masas de krill ant\u00e1rtico, lo que las hace altamente vulnerables si su alimento principal disminuye.<\/p><\/blockquote>\n\n\n\n<p>\u00abLuego de intensos eventos de&nbsp;<strong>El Ni\u00f1o<\/strong>, un alto porcentaje de hembras identificadas no volvieron a ser vistas en sus \u00e1reas de cr\u00eda, lo que podr\u00eda ocurrir porque las hembras reproductivas, luego de un a\u00f1o de gestaci\u00f3n seguido de otro a\u00f1o de lactancia, ser\u00edan las m\u00e1s vulnerables frente a la menor disponibilidad de krill\u00bb, se indica en el trabajo acad\u00e9mico. El estudio \u2013publicado adem\u00e1s por la revista&nbsp;<em>Science Advances<\/em>\u2013 fue liderado por la bi\u00f3loga Macarena Agrelo, investigadora del ICB y estudiante de doctorado del Programa de posgrado en Ecolog\u00eda de la Universidad Federal de Santa Catarina en Brasil, y cont\u00f3 con la colaboraci\u00f3n de investigadores de Argentina, Brasil, Reino Unido y Estados Unidos.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Para la conclusi\u00f3n, se analizaron cinco d\u00e9cadas de datos de fotoidentificaci\u00f3n de ballenas francas australes de Pen\u00ednsula Vald\u00e9s, sobre el extremo noreste del Chubut.<\/p><\/blockquote>\n\n\n\n<p>Se aplic\u00f3 el modelo de \u00abcaptura-recaptura\u00bb con las fotograf\u00edas de cada ballena en distintas temporadas que son tomadas por los vuelos, y qued\u00f3 en evidencia que, luego de intensos eventos de&nbsp;<strong>El Ni\u00f1o<\/strong>, un alto porcentaje de hembras identificadas no volvieron a ser vistas en sus \u00e1reas de cr\u00eda. Esto es posible porque desde 1971 se realizan anualmente relevamientos a\u00e9reos de fotoidentificaci\u00f3n para monitorear a la poblaci\u00f3n de&nbsp;<strong>ballenas francas<\/strong>&nbsp;que visitan las costas de Pen\u00ednsula Vald\u00e9s.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.unidiversidad.com.ar\/upload\/ballenas-peligro-de-extincion.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>Entre los muchos beneficios de contar con una base de datos tan amplia de identificaci\u00f3n individual a largo plazo, se destaca la posibilidad de evaluar c\u00f3mo la poblaci\u00f3n cambia a lo largo del tiempo y qu\u00e9 amenazas la afectan.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>En el mismo informe se consigna: \u00abLas ballenas juegan un rol fundamental en el ecosistema marino porque, al migrar desde las \u00e1reas de alimentaci\u00f3n, ricas en nutrientes, a las \u00e1reas de reproducci\u00f3n como Pen\u00ednsula Vald\u00e9s, act\u00faan como fertilizadoras de los oc\u00e9anos a trav\u00e9s de los nutrientes que aportan con sus heces, con lo que promueven la biodiversidad\u00bb.<\/p><\/blockquote>\n\n\n\n<p>Parad\u00f3jicamente, con su gran biomasa y vida longeva, las ballenas sustentan a la poblaci\u00f3n de krill de la que ellas mismas se alimentan al mantener sanas y productivas las redes tr\u00f3ficas del oc\u00e9ano, explica tambi\u00e9n el informe.<\/p>\n\n\n\n<p>El ICB pide que se tenga en cuenta \u00abel efecto que el cambio clim\u00e1tico tiene sobre las poblaciones de\u00a0<strong>ballenas<\/strong>, sobre todo frente a un escenario futuro de calentamiento global m\u00e1s intenso\u00bb. Los especialistas comparan la importancia de las ballenas en los oc\u00e9anos con la que tienen los bosques para la superficie continental, de all\u00ed que protegerlas es esencial para mitigar los efectos del cambio clim\u00e1tico.<\/p>\n\n\n\n<p>Fuente: https:\/\/www.unidiversidad.com.ar\/la-ballena-franca-austral-bajo-amenaza-por-el-calentamiento-de-los-oceanos<\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":6,"featured_media":74389,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","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":"","ast-disable-related-posts":"","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-5)","background-image":"","background-repeat":"repeat","background-position":"center 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