{"id":7553,"date":"2020-08-18T18:50:07","date_gmt":"2020-08-18T21:50:07","guid":{"rendered":"https:\/\/biologo.com.br\/bio\/?p=7553"},"modified":"2020-08-18T18:54:36","modified_gmt":"2020-08-18T21:54:36","slug":"os-narvais","status":"publish","type":"post","link":"https:\/\/biologo.com.br\/bio\/os-narvais\/","title":{"rendered":"Os Narvais"},"content":{"rendered":"<p><span style=\"font-size: 14pt; color: #000000;\"><span style=\"color: #3366ff;\"><strong>Os Narvais: <\/strong><span style=\"color: #000000;\">O narval \u00e9 uma baleia dentada de tamanho m\u00e9dio e o animal com os maiores caninos. <\/span><\/span><\/span><\/p>\n<p><span style=\"font-size: 14pt; color: #000000;\"><span style=\"color: #3366ff;\"><span style=\"color: #000000;\">\u00c9 uma das duas esp\u00e9cies vivas de baleias da fam\u00edlia Monodontidae, junto com a baleia beluga. Os narvais machos s\u00e3o distinguidos por uma presa helicoidal longa e reta que, na verdade, \u00e9 um canino superior esquerdo alongado.<\/span><\/span><\/span><\/p>\n<h2><span style=\"font-family: 'courier new', courier, monospace; font-size: 24pt; color: #000000;\"><strong>Os Narvais<\/strong><\/span><\/h2>\n<p><span style=\"font-size: 8pt; color: #000000;\">18\/8\/2020 ::\u00a0 Pesquisa FAPESP. \u00a0<span style=\"color: #999999;\"><a style=\"color: #999999;\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/\" target=\"_blank\" rel=\"noopener noreferrer\">CC BY-ND 4.0<\/a><\/span><\/span><\/p>\n<p><span style=\"color: #000000;\"><span style=\"font-family: georgia, palatino, serif; font-size: 24pt;\"><strong>O<\/strong><\/span>s narvais (<em>Monodon monoceros<\/em>), uma esp\u00e9cie de baleia com um corpo de at\u00e9 4 metros de comprimento que vive nas \u00e1guas do \u00c1rtico e da Groenl\u00e2ndia, impressionam pela longa presa helicoidal que apenas os machos exibem e pode chegar a 3 m. Altamente inervada e oca, a presa \u00e9 na verdade um prolongamento do dente canino superior esquerdo. <\/span><\/p>\n<figure id=\"attachment_7554\" aria-describedby=\"caption-attachment-7554\" style=\"width: 300px\" class=\"wp-caption alignright\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"7554\" data-permalink=\"https:\/\/biologo.com.br\/bio\/os-narvais\/os-narvais-monodon-monoceros\/\" data-orig-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2020\/08\/Os-narvais-Monodon-monoceros.jpg?fit=631%2C351&amp;ssl=1\" data-orig-size=\"631,351\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Os-narvais-Monodon-monoceros\" data-image-description=\"&lt;p&gt;Os narvais (Monodon monoceros). O narval (do ingl\u00eas narwhal, narwal; noruegu\u00eas e dinamarqu\u00eas narhval e sueco narval) \u00e9 uma baleia dentada de tamanho m\u00e9dio e o animal com os maiores caninos. Vive durante todo o ano no \u00c1rtico. \u00c9 uma das duas esp\u00e9cies vivas de baleias da fam\u00edlia Monodontidae, junto com a baleia beluga. Os narvais machos s\u00e3o distinguidos por uma,presa helicoidal longa e reta que, na verdade, \u00e9 um canino superior esquerdo alongado. Encontrada principalmente no \u00e1rtico canadense e \u00e1guas da Gronel\u00e2ndia, raramente ao sul de 65\u00b0 N de latitude, os narval s\u00e3o predadores do \u00e1rtico excepcionalmente especializados. No inverno, se alimentam de presas bent\u00f4nicas, principalmente peixes chatos, em profundidades de at\u00e9 1500 m sob densos blocos de gelo. Narvais foram ca\u00e7adas por mais de mil anos pelos povos inu\u00edtes no norte do Canad\u00e1 e da Gronel\u00e2ndia devido \u00e0 sua carne e marfim, e uma ca\u00e7a de subsist\u00eancia regulamentada continua at\u00e9 hoje. Ainda que as popula\u00e7\u00f5es pare\u00e7am est\u00e1veis\u200b\u200b, a narval \u00e9 particularmente vulner\u00e1vel \u200b\u200b\u00e0s altera\u00e7\u00f5es clim\u00e1ticas, devido a uma distribui\u00e7\u00e3o geogr\u00e1fica restrita e dieta especializada.&lt;\/p&gt;\n\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2020\/08\/Os-narvais-Monodon-monoceros.jpg?fit=631%2C351&amp;ssl=1\" class=\"wp-image-7554 size-medium\" src=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2020\/08\/Os-narvais-Monodon-monoceros.jpg?resize=300%2C167&#038;ssl=1\" alt=\"Os narvais (Monodon monoceros)\" width=\"300\" height=\"167\" srcset=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2020\/08\/Os-narvais-Monodon-monoceros.jpg?resize=300%2C167&amp;ssl=1 300w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2020\/08\/Os-narvais-Monodon-monoceros.jpg?w=631&amp;ssl=1 631w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><figcaption id=\"caption-attachment-7554\" class=\"wp-caption-text\"><span style=\"font-size: 10pt; color: #000000;\"><em>Monodon monoceros<\/em>: uma das duas esp\u00e9cies vivas de baleias da fam\u00edlia Monodontidae<\/span><\/figcaption><\/figure>\n<p><span style=\"color: #000000;\">Bi\u00f3logos da Universidade Estadual do Arizona, Estados Unidos, do Instituto de Recursos Naturais da Groenl\u00e2ndia e da Universidade Federal de S\u00e3o Paulo (Unifesp) examinaram a medida das presas de 245 machos coletadas na Groenl\u00e2ndia de 1983 a 2018 e conclu\u00edram que essa parte do corpo poderia atuar na sele\u00e7\u00e3o sexual.<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 14pt; color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/biologo.com.br\/bio\/documentarios-de-biologia-marinha\/\">Document\u00e1rios de Biologia Marinha<\/a><\/span><\/li>\n<li><span style=\"font-size: 14pt; color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/biologo.com.br\/bio\/mamiferos-marinhos\/\">Mam\u00edferos marinhos<\/a><\/span><\/li>\n<li><span style=\"color: #0000ff; font-size: 14pt;\"><a style=\"color: #0000ff;\" href=\"https:\/\/biologo.com.br\/bio\/origem-dos-mamiferos\/\">Origem dos mam\u00edferos<\/a><\/span><\/li>\n<\/ul>\n<div class=\"jetpack-video-wrapper\"><iframe loading=\"lazy\" title=\"#NossoPlaneta Bastidores: baleia narval\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/9n9mYkZfV0w?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/div>\n<h3><span style=\"font-family: 'courier new', courier, monospace; font-size: 12pt; color: #000000;\"><strong>Quanto maior a presa, melhor<\/strong><\/span><\/h3>\n<figure id=\"attachment_6143\" aria-describedby=\"caption-attachment-6143\" style=\"width: 150px\" class=\"wp-caption alignright\"><a style=\"color: #000000;\" href=\"https:\/\/biologo.com.br\/bio\/oceano-aberto\/\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"6143\" data-permalink=\"https:\/\/biologo.com.br\/bio\/oceano-aberto\/oceano-aberto\/\" data-orig-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2019\/07\/Oceano-Aberto.jpg?fit=631%2C351&amp;ssl=1\" data-orig-size=\"631,351\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Oceano-Aberto\" data-image-description=\"&lt;p&gt;Oceano Aberto. Baleia, whale, corcunda&lt;\/p&gt;\n\" data-image-caption=\"&lt;p&gt;Oceano Aberto&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2019\/07\/Oceano-Aberto.jpg?fit=631%2C351&amp;ssl=1\" class=\"wp-image-6143 size-thumbnail\" src=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2019\/07\/Oceano-Aberto.jpg?resize=150%2C150&#038;ssl=1\" alt=\"Oceano Aberto\" width=\"150\" height=\"150\" srcset=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2019\/07\/Oceano-Aberto.jpg?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2019\/07\/Oceano-Aberto.jpg?zoom=2&amp;resize=150%2C150&amp;ssl=1 300w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2019\/07\/Oceano-Aberto.jpg?zoom=3&amp;resize=150%2C150&amp;ssl=1 450w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a><figcaption id=\"caption-attachment-6143\" class=\"wp-caption-text\"><span style=\"font-size: 8pt; color: #000000;\">Veja temb\u00e9m: <a style=\"color: #000000;\" href=\"https:\/\/biologo.com.br\/bio\/oceano-aberto\/\">Oceano Aberto<\/a><\/span><\/figcaption><\/figure>\n<p><span style=\"color: #000000;\">\u201cAs presas s\u00e3o exibidas para outros machos, possivelmente para evitar confrontos agressivos mais intensos\u201d, diz Alexandre Palaoro, da Unifesp, um dos autores do estudo.<\/span><\/p>\n<p><span style=\"color: #000000;\">Al\u00e9m disso, a f\u00eamea possivelmente se acasala com o macho de maior presa (<em>Biology Letters<\/em>, 18 de mar\u00e7o). As presas quebradas, cicatrizes na cabe\u00e7a e cr\u00e2nios rachados dos esqueletos j\u00e1 haviam sugerido que esses prolongamentos poderiam servir para disputas territoriais entre machos.<\/span><\/p>\n<p><span style=\"color: #000000;\"><span style=\"font-size: 10pt;\">Fonte: <a style=\"color: #000000;\" href=\"https:\/\/revistapesquisa.fapesp.br\/\" target=\"_blank\" rel=\"noopener noreferrer\">Revista Fapesp<\/a> &gt;\u00a0<\/span><\/span><span style=\"font-size: 10pt;\"><a title=\"Quanto maior a presa, melhor\" href=\"https:\/\/revistapesquisa.fapesp.br\/quanto-maior-a-presa-melhor\/\">Quanto maior a presa, melhor<\/a><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Os Narvais: O narval \u00e9 uma baleia dentada de tamanho m\u00e9dio e o animal com os maiores caninos. \u00c9 uma<\/p>\n","protected":false},"author":1,"featured_media":7554,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"Os narvais (Monodon monoceros), uma esp\u00e9cie de baleia com um corpo de at\u00e9 4 metros (m) de comprimento que vive nas \u00e1guas do \u00c1rtico e da Groenl\u00e2ndia, impressionam pela longa presa helicoidal que apenas os machos exibem e pode chegar a 3 m.","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[4,25,27],"tags":[],"class_list":["post-7553","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-biologiamarinha","category-mamiferos","category-zoologia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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