{"id":61220,"date":"2015-02-03T22:10:10","date_gmt":"2015-02-03T22:10:10","guid":{"rendered":"https:\/\/www.chronobiology.com\/survival-of-the-fittest-mexican-tetra-loses-circadian-rhythm-to-adapt-2\/"},"modified":"2024-07-19T12:51:25","modified_gmt":"2024-07-19T19:51:25","slug":"la-supervivencia-del-m-s-apto-el-pez-tetra-mexicano-pierde-el-ritmo-circadiano-para-adaptarse","status":"publish","type":"post","link":"https:\/\/dev.chronobiology.com\/es\/la-supervivencia-del-m-s-apto-el-pez-tetra-mexicano-pierde-el-ritmo-circadiano-para-adaptarse\/","title":{"rendered":"La supervivencia del m\u00e1s apto: El pez tetra mexicano pierde el ritmo circadiano para adaptarse"},"content":{"rendered":"<h2>Relojes internos de humanos y peces<\/h2>\n<p><a href=\"https:\/\/www.chronobiology.com\/wp-content\/uploads\/2015\/02\/survival-of-the-fittest-mexican-tetra-loses-circadian-rhythm-to-adapt-2.jpg\"><img decoding=\"async\" class=\"alignright size-medium wp-image-5620\" src=\"https:\/\/www.chronobiology.com\/wp-content\/uploads\/2015\/02\/survival-of-the-fittest-mexican-tetra-loses-circadian-rhythm-to-adapt-2-300x233.jpg\" alt=\"Survival of the Fittest, Mexican Tetra, Circadian Rhythm\" width=\"300\" height=\"233\" srcset=\"https:\/\/www.chronobiology.com\/wp-content\/uploads\/2015\/02\/survival-of-the-fittest-mexican-tetra-loses-circadian-rhythm-to-adapt-2-300x233.jpg 300w, https:\/\/www.chronobiology.com\/wp-content\/uploads\/2015\/02\/survival-of-the-fittest-mexican-tetra-loses-circadian-rhythm-to-adapt-2-768x595.jpg 768w, https:\/\/www.chronobiology.com\/wp-content\/uploads\/2015\/02\/survival-of-the-fittest-mexican-tetra-loses-circadian-rhythm-to-adapt-2.jpg 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a>La vida de los seres humanos est\u00e1 regulada por sus <a href=\"https:\/\/www.chronobiology.com\/about-chronobiology\/#CircadianRhythm\" target=\"_blank\" rel=\"noopener\">ritmos circadianos<\/a>, o ciclos de 24 horas. Este ritmo afecta a todas las formas de vida, pero \u00bfse ha parado a pensar en una vida sin este reloj? Recientemente, investigadores del Departamento de Biolog\u00eda de la Universidad de Lund (Suecia) han estudiado <a href=\"http:\/\/journals.plos.org\/plosone\/article?id=10.1371\/journal.pone.0107877#s1\" target=\"_blank\" rel=\"noopener\">una especie que ha eliminado la necesidad de su reloj interno para conservar energ\u00eda<\/a>. Sin embargo, s\u00f3lo se les encuentra nadando en cuevas oscuras porque son una especie de peces. Aunque la mayor\u00eda reconoce a los peces tetra porque son habituales en las tiendas de mascotas, los bi\u00f3logos Damian Moran, Rowan Softley y Eric J. Warrant han estudiado a sus hom\u00f3logos ciegos, los peces tetra mexicanos. Estos peces, conocidos por su nombre cient\u00edfico Astyanax Mexicanus y tambi\u00e9n llamados peces cueva ciegos, son nativos de la ecozona ne\u00e1rtica y pueden encontrarse en ciertos r\u00edos de Texas y de las zonas central y oriental de M\u00e9xico. Los bi\u00f3logos de la Universidad de Lund, en un intento de llenar el vac\u00edo existente sobre c\u00f3mo se ha adaptado el tetra mexicano a su nuevo h\u00e1bitat, se centraron espec\u00edficamente en c\u00f3mo gasta energ\u00eda en comparaci\u00f3n con su forma de nadar en la superficie.<\/p>\n<h2>El otro tetra<\/h2>\n<p>Con el tiempo, la evoluci\u00f3n ha creado una nueva forma de tetra. El tetra mexicano vive en cuevas oscuras, carece de ojos y es albino por falta de pigmento en la piel. La evoluci\u00f3n tambi\u00e9n ha cambiado la forma de moverse de este pez. Al carecer de vista, el tetra mexicano tiene l\u00edneas laterales en el cuerpo que son sensibles a los cambios de presi\u00f3n del agua. La oscuridad total de su h\u00e1bitat le ha permitido renunciar a su ritmo circadiano. Este ritmo es t\u00edpico del tetra de superficie. Sin embargo, el tetra mexicano ha evolucionado y ya no necesita este reloj interno. El tetra mexicano vive entre el sue\u00f1o y la vigilia. Su falta de ritmo circadiano le permite conservar m\u00e1s energ\u00eda que sus cong\u00e9neres.<\/p>\n<h2>Un estudio de cronobiolog\u00eda<\/h2>\n<p><a href=\"https:\/\/www.chronobiology.com\/wp-content\/uploads\/2015\/02\/survival-of-the-fittest-mexican-tetra-loses-circadian-rhythm-to-adapt-3.jpg\"><img decoding=\"async\" class=\"alignright size-medium wp-image-5621\" src=\"https:\/\/www.chronobiology.com\/wp-content\/uploads\/2015\/02\/survival-of-the-fittest-mexican-tetra-loses-circadian-rhythm-to-adapt-3-300x300.jpg\" alt=\"Survival of the Fittest, Mexican Tetra, Circadian Rhythm\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.chronobiology.com\/wp-content\/uploads\/2015\/02\/survival-of-the-fittest-mexican-tetra-loses-circadian-rhythm-to-adapt-3-300x300.jpg 300w, https:\/\/www.chronobiology.com\/wp-content\/uploads\/2015\/02\/survival-of-the-fittest-mexican-tetra-loses-circadian-rhythm-to-adapt-3-150x150.jpg 150w, https:\/\/www.chronobiology.com\/wp-content\/uploads\/2015\/02\/survival-of-the-fittest-mexican-tetra-loses-circadian-rhythm-to-adapt-3-768x771.jpg 768w, https:\/\/www.chronobiology.com\/wp-content\/uploads\/2015\/02\/survival-of-the-fittest-mexican-tetra-loses-circadian-rhythm-to-adapt-3.jpg 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><a href=\"https:\/\/www.chronobiology.com\/\">La cronobiolog\u00eda<\/a> estudia los ritmos fisiol\u00f3gicos naturales que se producen en cada organismo vivo. Moran, Softley y Warrant utilizaron este tipo de estudio para observar al tetra mexicano y descubrir su falta de ritmo circadiano.<\/p>\n<p>Antes de este estudio, exist\u00eda informaci\u00f3n sobre c\u00f3mo el tetra mexicano se ha adaptado a su entorno y es capaz de encontrar alimento incluso con su falta de vista. Sin embargo, se dispon\u00eda de poca informaci\u00f3n sobre las diferencias en su fisiolog\u00eda y uso de la energ\u00eda en comparaci\u00f3n con el tetra que vive en la superficie. Los tres bi\u00f3logos descubrieron tambi\u00e9n que los estudios anteriores no ten\u00edan en cuenta la importancia de la luz en la tasa metab\u00f3lica del pez. Durante su estudio, los bi\u00f3logos midieron el consumo de energ\u00eda de ambas formas de pez creando un canal de agua para regular la velocidad de nataci\u00f3n. Este proceso se observ\u00f3 bajo ciclos de luz y oscuridad y tambi\u00e9n en completa oscuridad para ver si su tasa metab\u00f3lica estaba controlada por sus ritmos circadianos. La muestra incluy\u00f3 31 peces y se recogieron 9401 mediciones del consumo de ox\u00edgeno. Las tasas metab\u00f3licas de ambos peces disminu\u00edan a medida que cambiaban las condiciones. Bas\u00e1ndose en la informaci\u00f3n de sus muestras, los bi\u00f3logos descubrieron que los niveles de ox\u00edgeno y metab\u00f3licos de la forma superficial aumentaban durante el d\u00eda, y los de los peces mexicanos tend\u00edan a mantenerse iguales tanto de d\u00eda como de noche.<\/p>\n<p>Durante los periodos de oscuridad, el metabolismo de los peces de la superficie disminu\u00eda para conservar la energ\u00eda necesaria para el d\u00eda. El pez ciego de la cueva no experiment\u00f3 el mismo aumento diurno en el consumo de ox\u00edgeno. Su metabolismo permaneci\u00f3 invariable independientemente del ciclo d\u00eda\/noche. Debido a esta diferencia, el tetra mexicano ahorra un 27% m\u00e1s de energ\u00eda que su hom\u00f3logo. Adem\u00e1s, cuando la forma que vive en la superficie fue puesta en la misma oscuridad, utiliz\u00f3 un 38 por ciento m\u00e1s de su energ\u00eda en el mismo entorno. Los resultados llevaron a los bi\u00f3logos a creer que la posesi\u00f3n de vista por parte del pez de superficie no afectaba al gasto energ\u00e9tico, sino que era la falta de ritmo circadiano en el tetra mexicano lo que explicaba su menor uso de energ\u00eda. La evoluci\u00f3n ha dado al tetra mexicano ciego una forma de adaptarse a su entorno en las cuevas completamente negras.<\/p>\n<h2>Lo que esta informaci\u00f3n significa para otras especies<\/h2>\n<p>Existen pocas investigaciones sobre estudios de la tasa metab\u00f3lica controlada por la actividad. En la mayor\u00eda de las investigaciones existentes, no era posible que el animal mantuviera un mismo nivel de actividad durante varios d\u00edas. Para los animales con patrones circadianos en su nivel de actividad, localizaci\u00f3n de alimento e ingesti\u00f3n, su reloj circadiano les permite prever las reacciones metab\u00f3licas y responder de forma m\u00e1s productiva. El tetra mexicano utilizaba un m\u00e9todo de ahorro de energ\u00eda en su h\u00e1bitat, donde el alimento es limitado. Este estudio permiti\u00f3 a los bi\u00f3logos profundizar en la relaci\u00f3n entre el metabolismo energ\u00e9tico y el ritmo circadiano. Este estudio nos da una idea m\u00e1s clara de c\u00f3mo podr\u00eda ser una vida sin ritmo circadiano d\u00eda\/noche. Cuanto m\u00e1s sepamos sobre los ritmos circadianos, m\u00e1s cerca estaremos de utilizar esos conocimientos para combatir las alteraciones del organismo que provocan enfermedades tanto en animales como en humanos.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Relojes internos de humanos y peces La vida de los seres humanos est\u00e1 regulada por sus ritmos circadianos, o ciclos de 24 horas. Este ritmo afecta a todas las formas de vida, pero \u00bfse ha parado a pensar en una vida sin este reloj? Recientemente, investigadores del Departamento de Biolog\u00eda de la Universidad de Lund [&hellip;]<\/p>\n","protected":false},"author":15,"featured_media":23083,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[205,212],"tags":[],"class_list":{"0":"post-61220","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-energia-es","8":"category-metabolismo-es","9":"entry"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.4 (Yoast SEO v23.4) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>La supervivencia del m\u00e1s apto: El pez tetra mexicano pierde el ritmo 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