{"id":16001,"date":"2018-04-21T14:59:12","date_gmt":"2018-04-21T10:29:12","guid":{"rendered":"http:\/\/nasimword.ir\/?p=16001"},"modified":"2018-04-21T14:59:12","modified_gmt":"2018-04-21T10:29:12","slug":"bajau-sea-nomads-have-genetically-evolved-to-become-expert-free-divers","status":"publish","type":"post","link":"https:\/\/nasimword.ir\/?p=16001&lang=en","title":{"rendered":"Bajau ‘Sea Nomads’ have genetically evolved to become expert free-divers"},"content":{"rendered":"

\"Bajau\"<\/a><\/p>\n

The Indigenous Bajau people of South-East Asia have developed big spleens through natural selection, allowing them to dive to great depths, a study found.<\/p>\n

Researchers said their findings concerning the Bajau’s genetic adaptation adds a new example “to the list of remarkable genetic adaptations humans have experienced in recent evolutionary history”.<\/p>\n

Also known as \u201cSea Nomads,\u201d they are marine hunter-gatherers living off shellfish from the seabed, traditionally living a nomadic existence as their name suggests.<\/p>\n

The Bajau are renowned for their extraordinary breath-holding abilities \u2014 they are capable of diving up to 70m with nothing more than a set of weights and a pair of wooden goggles \u2014 however, it was previously unknown whether this has a genetic basis.<\/p>\n

New research, published in academic journal Cell30386-6), found the Bajau had large spleens, allowing them to dive to great depths.<\/p>\n

Their larger spleens provided an oxygen reservoir for diving.<\/p>\n

Researchers found that when diving in a traditional way they could spend around 60% of their time underwater, diving to great depths.<\/p>\n

To find out if the Bajau’s extraordinary diving skills were based on a genetic adaptation, they firstly compared the Sea Nomads to their neighbours.<\/p>\n

They found the Bajau, both divers and non-divers, had significantly larger spleens than their close geographic and genetic neighbours, the Saluan.<\/p>\n

In fact, the Bajau’s spleens were on average 50% larger than the Saluan, who interact minimally with the marine environment.<\/p>\n

Looking for a genetic basis for the size difference, researchers then scanned both groups’ genomes and compared them for areas that had been under natural selection.<\/p>\n

A site on a gene known as PDE10A differed greatly between the groups and was found to correlate with the Bajau’s larger spleen size.<\/p>\n

This finding concerning the Bajau might be medically relevant in understanding hypoxia adaptations \u2014 adaptations to low oxygen \u2014 which the study calls “a pertinent medical issue”.<\/p>\n

The Sea Nomads have been travelling the Southeast Asian seas on houseboats for over 1,000 years.<\/p>\n

Rough estimates suggest they are around 1 million in population and live across the southern Philippines, Malaysia and Indonesia.<\/p>\n","protected":false},"excerpt":{"rendered":"

The Indigenous Bajau people of South-East Asia have developed big spleens through natural selection, allowing them to dive to great depths, a study found. Researchers said their findings concerning the Bajau’s genetic adaptation adds a new example “to the list of remarkable genetic adaptations humans have experienced in recent evolutionary history”. Also known as \u201cSea …<\/p>\n","protected":false},"author":25,"featured_media":16002,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[5951],"tags":[],"yoast_head":"\nBajau 'Sea Nomads' have genetically evolved to become expert free-divers - Nasim Word<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/nasimword.ir\/?p=16001&lang=en\" \/>\n<meta property=\"og:locale\" content=\"fa_IR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Bajau 'Sea Nomads' have genetically evolved to become expert free-divers - Nasim Word\" \/>\n<meta property=\"og:description\" content=\"The Indigenous Bajau people of South-East Asia have developed big spleens through natural selection, allowing them to dive to great depths, a study found. Researchers said their findings concerning the Bajau’s genetic adaptation adds a new example “to the list of remarkable genetic adaptations humans have experienced in recent evolutionary history”. 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