{"id":77795,"date":"2023-04-25T19:00:00","date_gmt":"2023-04-25T22:00:00","guid":{"rendered":"http:\/\/patagoniambiental.com.ar\/info\/?p=77795"},"modified":"2024-08-17T11:12:38","modified_gmt":"2024-08-17T14:12:38","slug":"investigan-la-muerte-masiva-de-mejillines-en-las-playas-de-puerto-madryn","status":"publish","type":"post","link":"https:\/\/patagoniambiental.com.ar\/info\/investigan-la-muerte-masiva-de-mejillines-en-las-playas-de-puerto-madryn\/","title":{"rendered":"Investigan la muerte masiva de mejillines en las playas de Puerto Madryn"},"content":{"rendered":"\n<!--more-->\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-por-alejandro-cannizzaro-segun-los-cientificos-del-instituto-de-biologia-de-organismos-marinos-el-aumento-de-las-temperaturas-en-el-aire-y-el-mar-la-presencia-de-especies-invasoras-la-contaminacion-y-el-turismo-constituyen-las-causas\">Por <a>Alejandro Cannizzaro<\/a>.-Seg\u00fan los cient\u00edficos del Instituto de Biolog\u00eda de Organismos Marinos, el aumento de las temperaturas en el aire y el mar, la presencia de especies invasoras, la contaminaci\u00f3n y el turismo constituyen las causas.<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.pagina12.com.ar\/styles\/focal_3_2_960x640\/public\/2023-04\/718127-20-a-20m-c3-a9ndez-20-281-29.jpg?h=c6980913&amp;itok=Ca1iqBH_\" alt=\"Perumytilus purpuratus es el nombre de la especie de mejillines que estudian. (Fuente: Mar\u00eda Marta M\u00e9ndez)\"\/><figcaption class=\"wp-element-caption\">Perumytilus purpuratus es el nombre de la especie de mejillines que estudian.. Imagen: Mar\u00eda Marta M\u00e9ndez<\/figcaption><\/figure>\n\n\n\n<p>Cient\u00edficos del Instituto de Biolog\u00eda de Organismos Marinos (IBIOMAR-Conicet) analizan las causas de la desaparici\u00f3n de mejillines en las playas de Puerto Madryn. Aunque es parecido a un mejill\u00f3n, se trata de una especie distinta. Hasta hace poco tiempo cubr\u00edan aproximadamente el 90 por ciento de la superficie que habitaban, pero en la actualidad es casi imposible encontrarlos. El aumento en la temperatura del aire y del agua del mar, el impacto del turismo, la contaminaci\u00f3n y las devastaciones que provocan especies invasoras &#8211;como el cangrejo verde, que se alimenta de estos animales&#8211; son algunas de las causas que explican este fen\u00f3meno.<\/p>\n\n\n\n<p>Cuando baja la marea, se asoma un mundo muy diverso de organismos marinos en las playas que est\u00e1n cubiertas de rocas. Hace algunos a\u00f1os era muy com\u00fan ver mejillines por todos lados. Sin embargo, la situaci\u00f3n actual es otra. \u201cHace una d\u00e9cada comenzamos a estudiar los mejillines y <strong>observ\u00e1bamos el impacto que ten\u00eda el turismo en esta comunidad mediante el pisoteo humano y el tr\u00e1nsito de veh\u00edculos<\/strong>, una actividad que disminuye dr\u00e1sticamente la cobertura\u201d, recuerda <strong>Mar\u00eda Mendez<\/strong>, investigadora del IBIOMAR.<\/p>\n\n\n\n<p><strong>En el verano de 2019 sucedi\u00f3 una mortandad masiva de mejillines, incluso en lugares donde la gente no pisaba<\/strong>. Adem\u00e1s, su cantidad sigui\u00f3 menguando durante la pandemia, cuando el turismo no estaba permitido y los veh\u00edculos no circulaban. \u201cAh\u00ed fue evidente que, adem\u00e1s del pisoteo, algo estaba sucediendo\u201d, destaca Mendez.<\/p>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-a-la-intemperie\">A la intemperie<\/h2>\n\n\n\n<p>As\u00ed, un equipo de especialistas comenz\u00f3 a evaluar cuestiones ambientales relacionadas al cambio clim\u00e1tico y <strong>observ\u00f3 un aumento de la temperatura del aire y del agua durante los \u00faltimos diez a\u00f1os<\/strong>. La cantidad de d\u00edas de mucho calor es cada vez m\u00e1s frecuente en la regi\u00f3n y los mejillines quedan cubiertos y descubiertos por el mar cada seis horas, seg\u00fan suba o baje el agua. Cuando est\u00e1n a la intemperie, cierran sus v\u00e1lvulas para protegerse y reducir cualquier tipo de interacci\u00f3n. No obstante, <strong>el aire caliente eleva su temperatura interna y no tienen manera de regularla<\/strong>.<\/p>\n\n\n\n<p>Seg\u00fan indica el equipo cient\u00edfico, <strong>no hay otros registros previos de mortandades tan grandes de estos animales en el mundo<\/strong>. \u201cDurante 2017 se registr\u00f3 una m\u00e1xima hist\u00f3rica en la temperatura del aire de 44.7 grados y al a\u00f1o siguiente comenz\u00f3 a disminuir la poblaci\u00f3n de mejillines\u201d, resalta Mendez.<\/p>\n\n\n\n<p>\u201cAnalizamos registros hist\u00f3ricos y observamos que <strong>llegaron a estar expuestos a temperaturas de m\u00e1s de 40 grados<\/strong>, cuando lo normal es que no excedan los 35 en el aire. Adem\u00e1s <strong>estuvieron expuestos a 24 grados de temperatura del agua, cuando raramente supera los 20<\/strong>\u201d, describe <strong>Juan Pablo Livore<\/strong>, integrante de la investigaci\u00f3n.<\/p>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-termometros-en-la-costa\">Term\u00f3metros en la costa<\/h2>\n\n\n\n<p>Durante 2022 los cient\u00edficos colocaron term\u00f3metros en la costa para medir de manera continua la temperatura del agua y del aire en el verano. Lo que har\u00e1n los investigadores es replicar esas subas en el laboratorio para poder observar los efectos que ocasionan sobre los mejillines.<\/p>\n\n\n\n<p>Sin embargo, es imposible se\u00f1alar una \u00fanica raz\u00f3n que explique su mortandad. \u201c<strong>Otro factor que incide en la baja de la cobertura es la llegada a estas playas en 2015 del cangrejo verde europeo<\/strong>, una especie invasora que es muy depredadora y se alimenta de mejillines\u201d, asegura Mendez.<\/p>\n\n\n\n<p>Adem\u00e1s, la cient\u00edfica destaca que otro motivo para comprender el fen\u00f3meno es <strong>el aumento de la contaminaci\u00f3n en relaci\u00f3n al incremento del tr\u00e1fico mar\u00edtimo en el Golfo Nuevo<\/strong>, ubicado al noreste de Chubut. Adem\u00e1s de los experimentos, estudiar\u00e1n el acuario y la cantidad de mejillines que consume el cangrejo verde para poder conocer su incidencia en las mortandades registradas.<\/p>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-filtradores-y-purificadores\">Filtradores y purificadores<\/h2>\n\n\n\n<p>Estos animales cumplen un rol importante dentro de las cadenas tr\u00f3ficas. Son las presas de muchos animales, principalmente aves y otros invertebrados. Adem\u00e1s, <strong>al ser organismos filtradores, colaboran en la purificaci\u00f3n del agua<\/strong>.<\/p>\n\n\n\n<p>\u201cSon especies formadoras de h\u00e1bitat. <strong>Lo que hacen es generar un ambiente con condiciones menos dif\u00edciles para que otras especies puedan vivir dentro de ese entramado que ellos forman<\/strong>. Cuando cubr\u00edan entre un 90 y 100 por ciento del sustrato, habitaban un mont\u00f3n de especies asociadas por debajo y entre los mejillines\u201d, afirma Livore.<\/p>\n\n\n\n<p>Fuente: Pagina 12<\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":77796,"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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