{"id":6890,"date":"2015-04-09T08:35:00","date_gmt":"2015-04-09T08:35:00","guid":{"rendered":"http:\/\/blogs.funiber.org\/pt\/?p=6890"},"modified":"2015-05-28T08:35:45","modified_gmt":"2015-05-28T08:35:45","slug":"funiber-ursos-polares-ameacados-pela-poluicao","status":"publish","type":"post","link":"https:\/\/www.funiber.blog\/pt\/meio-ambiente\/2015\/04\/09\/funiber-ursos-polares-ameacados-pela-poluicao","title":{"rendered":"Ursos polares amea\u00e7ados pela polui\u00e7\u00e3o"},"content":{"rendered":"<p>Os seres humanos costumam jogar, anualmente, toneladas de pl\u00e1stico no oceano e o ac\u00famulo de res\u00edduos originou uma <a title=\"Grande Por\u00e7\u00e3o de Lixo\" href=\"http:\/\/pt.wikipedia.org\/wiki\/Grande_Por%C3%A7%C3%A3o_de_Lixo_do_Pac%C3%ADfico\" target=\"_blank\">\u201cilha de lixo\u201d<\/a> entre os Estados Unidos e o Jap\u00e3o. Os <strong>pl\u00e1sticos desintegram-se em pequenas part\u00edculas<\/strong> e estes <strong>poluentes est\u00e3o afetando a sa\u00fade e o sistema reprodutivo dos ursos polares (<i>Ursus maritimus<\/i>)<\/strong>. A exposi\u00e7\u00e3o \u00e0 polui\u00e7\u00e3o causada pelo homem agora \u00e9 somada \u00e0 redu\u00e7\u00e3o do gelo polar, ao estresse nutricional e ao aquecimento global.<!--more--><\/p>\n<p>Mar\u00eda Jesus Obreg\u00f3n, pesquisadora do Biomedical Research Institute, explica que \u201ca <strong>sa\u00fade dos ursos polares est\u00e1 sendo atacada por todos os lados, mas especialmente pela exposi\u00e7\u00e3o a poluentes ambientais<\/strong>\u201d. O estudo foi publicado na revista Environmental Research.<\/p>\n<p><strong>Amea\u00e7as<\/strong><br \/>\nOs pesquisadores identificaram as seguintes amea\u00e7as para a sa\u00fade dos ursos polares:<br \/>\n<strong>\u2013 Mudan\u00e7a clim\u00e1tica e aquecimento global.<\/strong><br \/>\n<strong>\u2013 Estresse nutricional.<\/strong><br \/>\n<strong>\u2013 Exposi\u00e7\u00e3o a poluentes.<\/strong><br \/>\n<strong>\u2013 Estresse psicol\u00f3gico cr\u00f4nico.<\/strong><br \/>\n<strong>\u2013 Doen\u00e7as e parasitas.<\/strong><br \/>\n<strong>\u2013 Aumento da exposi\u00e7\u00e3o aos competidores.<\/strong><\/p>\n<p>Os cientistas enfatizaram que a exposi\u00e7\u00e3o a poluentes \u00e9, em ordem de import\u00e2ncia, a terceira maior amea\u00e7a.<\/p>\n<p>O estudo, realizado por cientistas da Noruega, aponta que a polui\u00e7\u00e3o causada por pl\u00e1sticos e poluentes ambientais est\u00e1 afetando o sistema end\u00f3crino e o sistema reprodutivo destes mam\u00edferos, que &#8220;\u00e9 especialmente relevante nesta esp\u00e9cie em vias de extin\u00e7\u00e3o&#8221;, acrescenta Obreg\u00f3n.<\/p>\n<p>Os cientistas indicaram que os ursos que habitam a regi\u00e3o da Groenl\u00e2ndia est\u00e3o expostos a n\u00edveis crescentes de poluentes. Os compostos organoclorados e os pesticidas t\u00eam um efeito sobre a produ\u00e7\u00e3o de horm\u00f4nios da tireoide, os tecidos e a enzima deiodinase, que \u00e9 respons\u00e1vel pela estabiliza\u00e7\u00e3o dos horm\u00f4nios da tireoide destes animais.<\/p>\n<p>Neste estudo, foram analisados mais de 50 poluentes organo-halogenados e seus metabolismos no plasma e nos tecidos dos ursos. Estudos anteriores demonstraram a rela\u00e7\u00e3o entre a presen\u00e7a de poluentes e a altera\u00e7\u00e3o dos n\u00edveis plasm\u00e1ticos dos horm\u00f4nios produzidos pela tireoide de animais da fauna selvagem do \u00c1rtico, mas \u00e9 a primeira vez que se estabelece uma rela\u00e7\u00e3o com a altera\u00e7\u00e3o dos tecidos.<\/p>\n<p>Fonte:<br \/>\n<a href=\"http:\/\/www.sciencedaily.com\/releases\/2015\/04\/150407085025.htm\" target=\"_blank\">http:\/\/www.sciencedaily.com\/releases\/2015\/04\/150407085025.htm<\/a><\/p>\n<p>Detalhes sobre a \u201cilha de lixo\u201d:<br \/>\n<a href=\"http:\/\/es.wikipedia.org\/wiki\/Isla_de_basura\" target=\"_blank\">http:\/\/es.wikipedia.org\/wiki\/Isla_de_basura<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Os seres humanos costumam jogar, anualmente, toneladas de pl\u00e1stico no oceano e o ac\u00famulo de res\u00edduos originou uma \u201cilha de lixo\u201d entre os Estados Unidos e o Jap\u00e3o. Os pl\u00e1sticos desintegram-se em pequenas part\u00edculas e estes poluentes est\u00e3o afetando a sa\u00fade e o sistema reprodutivo dos ursos polares (Ursus maritimus). A exposi\u00e7\u00e3o \u00e0 polui\u00e7\u00e3o causada [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":6891,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_newsletter_tier_id":0,"footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[2],"tags":[213,254],"jetpack_publicize_connections":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ursos polares amea\u00e7ados pela polui\u00e7\u00e3o - FuniBlogs - FUNIBER<\/title>\n<meta name=\"robots\" content=\"noindex, nofollow\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ursos polares amea\u00e7ados pela polui\u00e7\u00e3o - FuniBlogs - FUNIBER\" \/>\n<meta property=\"og:description\" content=\"Os seres humanos costumam jogar, anualmente, toneladas de pl\u00e1stico no oceano e o ac\u00famulo de res\u00edduos originou uma \u201cilha de lixo\u201d entre os Estados Unidos e o Jap\u00e3o. Os pl\u00e1sticos desintegram-se em pequenas part\u00edculas e estes poluentes est\u00e3o afetando a sa\u00fade e o sistema reprodutivo dos ursos polares (Ursus maritimus). 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