{"id":7360,"date":"2026-11-08T03:54:19","date_gmt":"2026-11-08T08:54:19","guid":{"rendered":"https:\/\/canasanta.ca\/?p=7360"},"modified":"2026-11-08T03:54:19","modified_gmt":"2026-11-08T08:54:19","slug":"avispas-darwin-evolucion-sin-retorno","status":"publish","type":"post","link":"https:\/\/canasanta.ca\/en\/ciencia\/avispas-darwin-evolucion-sin-retorno\/","title":{"rendered":"LAS AVISPAS QUE NO PUEDEN VOLVER ATR\u00c1S"},"content":{"rendered":"

Las avispas parasitoides que inquietaron a Charles Darwin<\/strong> han ofrecido una respuesta inesperada a una pregunta fundamental de la biolog\u00eda: \u00bfpuede la evoluci\u00f3n regresar al punto de partida? Una investigaci\u00f3n sobre 697 especies de la familia Ichneumonidae<\/em> indica que ciertas estrategias de reproducci\u00f3n aparecieron muchas veces de manera independiente, pero casi nunca recorrieron el camino inverso.<\/p>\n

El estudio, difundido el 6 de noviembre de 2026 por el Museo de Historia Natural de Berl\u00edn<\/strong> y publicado en la revista cient\u00edfica Current Biology<\/em>, examina c\u00f3mo estas avispas utilizan otros animales para alimentar a sus cr\u00edas. Sus conclusiones no significan que toda evoluci\u00f3n sea irreversible: describen patrones concretos observados en un grupo extraordinariamente diverso de insectos.<\/p>\n

Estas avispas depositan sus huevos sobre el cuerpo o dentro de otros artr\u00f3podos, como orugas, escarabajos y ara\u00f1as. Cuando nacen, las larvas se alimentan de su hu\u00e9sped. Algunas especies lo paralizan antes de poner los huevos; otras permiten que permanezca vivo, se mueva y contin\u00fae creciendo mientras el parasitoide se desarrolla.<\/p>\n

UN EXPERIMENTO NATURAL DE 697 ESPECIES<\/h2>\n

El contraste entre esas estrategias permiti\u00f3 a los cient\u00edficos reconstruir una parte de la historia evolutiva del grupo. En lugar de estudiar una sola especie, compararon informaci\u00f3n gen\u00e9tica representativa de los grandes linajes de avispas de Darwin.<\/p>\n

Los investigadores detectaron que el paso desde la estrategia de paralizar al hu\u00e9sped hacia la explotaci\u00f3n de hu\u00e9spedes que contin\u00faan desarroll\u00e1ndose ocurri\u00f3 al menos 23 veces de forma independiente. Sin embargo, en la reconstrucci\u00f3n evolutiva no encontraron pruebas de que los linajes hubieran regresado a la estrategia ancestral de par\u00e1lisis.<\/p>\n

Tambi\u00e9n observaron que el desarrollo de las larvas dentro del hu\u00e9sped, en lugar de hacerlo externamente, surgi\u00f3 repetidas veces y que las reversiones fueron poco frecuentes. Ambos resultados apuntan a restricciones hist\u00f3ricas que pueden condicionar las opciones futuras de una especie.<\/p>\n

\"Avispa
Avispa icneum\u00f3nida. Fotograf\u00eda de contexto: Ngan Nguyen \/ Unsplash.<\/figcaption><\/figure>\n

CUANDO EL PASADO LIMITA EL FUTURO<\/h2>\n

El investigador Bernardo F. Santos<\/strong>, primer autor del trabajo, compara ese fen\u00f3meno con un mecanismo de trinquete: permite avanzar en una direcci\u00f3n, pero dificulta retroceder. La comparaci\u00f3n describe una tendencia evolutiva, no una ley universal ni una imposibilidad absoluta de cambio.<\/p>\n

Las adaptaciones necesarias para vivir dentro de un organismo que sigue creciendo pueden involucrar modificaciones del desarrollo, del comportamiento y de las interacciones fisiol\u00f3gicas con el hu\u00e9sped. Una vez acumulados esos cambios, recuperar una estrategia anterior podr\u00eda exigir transformaciones adicionales que la selecci\u00f3n natural no favorece.<\/p>\n

Una de las implicaciones del estudio es que la evoluci\u00f3n combina repetici\u00f3n y dependencia del pasado. Distintos linajes pueden llegar por separado a soluciones similares cuando enfrentan problemas parecidos; al mismo tiempo, sus decisiones evolutivas previas delimitan qu\u00e9 soluciones quedan disponibles despu\u00e9s.<\/p>\n

Esta conclusi\u00f3n debe interpretarse con cautela. El equipo infiri\u00f3 transiciones antiguas a partir de relaciones gen\u00e9ticas entre especies actuales; no observ\u00f3 directamente cada cambio durante millones de a\u00f1os. La ausencia de reversiones detectadas en una reconstrucci\u00f3n tampoco demuestra que jam\u00e1s puedan ocurrir.<\/p>\n

<\/div>\n

EL ENIGMA QUE INQUIET\u00d3 A DARWIN<\/h2>\n

El nombre popular de estas avispas recuerda una reflexi\u00f3n del propio Darwin. En una carta enviada en 1860 al bot\u00e1nico estadounidense Asa Gray<\/strong>, el naturalista expres\u00f3 su desconcierto ante la existencia de insectos cuyas larvas se alimentaban del interior de orugas vivas. Aquella observaci\u00f3n acabar\u00eda asoci\u00e1ndose a uno de los ejemplos m\u00e1s perturbadores de la selecci\u00f3n natural.<\/p>\n

Hoy se conocen m\u00e1s de 25.000 especies descritas de esta familia. Su enorme variedad de hu\u00e9spedes y formas de reproducci\u00f3n las convierte en un laboratorio natural para estudiar la especializaci\u00f3n, la diversidad y los l\u00edmites del cambio evolutivo.<\/p>\n

El nuevo trabajo no propone que la naturaleza avance hacia una meta predeterminada. Sugiere algo m\u00e1s preciso: el pasado biol\u00f3gico importa. Una innovaci\u00f3n puede abrir oportunidades inmediatas y, al mismo tiempo, volver menos accesibles rutas que antes estaban disponibles. La evoluci\u00f3n, en ese sentido, no siempre conserva una puerta de regreso.<\/p>","protected":false},"excerpt":{"rendered":"

Un an\u00e1lisis gen\u00e9tico de 697 especies revela que algunas estrategias de las avispas parasitoides surgieron repetidamente, pero casi nunca se revirtieron.<\/p>","protected":false},"author":284226809,"featured_media":7358,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","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},"jetpack_post_was_ever_published":false},"categories":[33205457,3213],"tags":[33208738,33208739,33208740],"class_list":["post-7360","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-al-dia","category-ciencia","tag-avispas-parasitoides","tag-evolucion-biologica","tag-ichneumonidae"],"acf":{"introduccion":"","fuentes_y_referencias":"Santos, B. 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