{"id":127467,"date":"2013-08-15T15:35:44","date_gmt":"2013-08-15T18:35:44","guid":{"rendered":"http:\/\/revistapesquisa.fapesp.br\/?p=127467"},"modified":"2013-08-23T18:38:50","modified_gmt":"2013-08-23T21:38:50","slug":"why-are-the-whales-dying-2","status":"publish","type":"post","link":"https:\/\/revistapesquisa.fapesp.br\/en\/why-are-the-whales-dying-2\/","title":{"rendered":"Why are the whales dying?"},"content":{"rendered":"

Published in March 2013<\/em><\/p>\n

\"A

Humpback Whale Project (PBJ)<\/span>A specimen being analyzed on a beach in AbrolhosHumpback Whale Project (PBJ)<\/span><\/p><\/div>\n

A\u00a0joint effort by researchers from the states of S\u00e3o Paulo and Bahia has been looking into the lives \u2014 and deaths \u2014 of humpback whales (Megaptera novaeangliae<\/em>) along the Brazilian coast. Every year, between July and November, these huge cetaceans swim north from freezing cold Antarctic seas into their breeding grounds in the warm tropical waters off the Brazilian coast. Although this migration route is well known, there is little information about the health of these whales and the reasons why they become ill. There is a simple reason for this: it is not easy to collect tissue samples under adequate conditions to estimate the health status of these marine mammals because they can grow to 16 meters in length, weigh up to 40 metric tons, and are constantly on the move.<\/p>\n

Two groups of veterinarians from the University of S\u00e3o Paulo (USP) and the Petrobras-funded Humpback Whale Project (PBJ) are working to change that scenario. The group, led by Jos\u00e9 Luiz Cat\u00e3o Dias (USP) began systematically collecting skin samples and biological material expelled by the whales through their blowholes. By analyzing tissue from live animals and material extracted from the bones of whales stranded along the shore, the researchers plan to record the state of health of Brazilian humpback whales.<\/p>\n

\u201cWe are using the biological material collected from live animals to investigate various pathogens,\u201d says Cat\u00e3o. His group is also analyzing the project\u2019s collection of photos taken during field expeditions to check whether the monitored animals gained or lost weight, developed skin lesions, or gave birth. \u201cWe want to understand the health dynamics of the whales and how human activities can influence them, and thus contribute to whale stranding and death,\u201d Cat\u00e3o affirms.<\/p>\n

Lesions and Malformations<\/strong><\/p>\n

\"Humpback

Humpback Whale Project (PBJ)<\/span><\/a> Humpback whale during typical leapHumpback Whale Project (PBJ)<\/span><\/p><\/div>\n

In early November 2012, Cat\u00e3o and K\u00e1tia Groch, his doctoral student at USP, in collaboration with veterinarians Milton Marcondes and Adriana Colosio (PBJ) published the project\u2019s initial results in the journal Diseases of Aquatic Organisms<\/em>. According to the researchers, the paper is one of the world\u2019s largest inventories of skeletal abnormalities in humpback whales. In their work, they analyzed the bones of 49 animals stranded between 2002 and 2011 in the Abrolhos region of southern Bahia State.<\/p>\n

Of the 49 whales, 12 presented at least one type of skeletal problem. Five whales had birth defects; four had inflammatory lesions; five displayed degenerative changes; and four showed signs of trauma (possibly from collisions with boats, in several cases). \u201cAnalyzing the bone changes of these animals could provide valuable data about the life history of whales and their pathological conditions,\u201d says Groch. \u201cSome of these changes may have contributed to the whales getting stranded, especially the lesions in the tail region, which we found on two animals,\u201d she explains.<\/p>\n

The researchers believe that constant monitoring is the only way to understand the extent to which these animals are affected by exploitation and modification of the marine environment, which might increase further when subsalt oil exploration is fully underway. \u201cWhales and dolphins are indicators of marine ecosystem health. The results of these studies are essential for understanding the threats to whale populations and to provide supporting data for public policies designed for their protection,\u201d says Groch.<\/p>\n

Whale hunting was permitted in Brazil until three decades ago, when it was banned by Federal Law No. 7,643. In 2008, Decree No. 6,698 declared Brazil\u2019s marine jurisdictional waters to be a \u201cwhale and dolphin sanctuary.\u201d The country\u2019s current legislation for whale protection is very good. \u201cWhales already face major natural challenges just keeping themselves alive. Protection policies can only be effective with efficient oversight and by reconciling economic growth, exploitation of marine resources, and environmental preservation,\u201d Groch affirms.<\/p>\n

Project<\/strong>
\nAnalysis of health aspects of humpback whales (Megaptera novaeangliae) in the southeastern and northeastern Brazilian coast, with special emphasis on anthropogenic interactions \u2013 No. 2011\/08357-0; Grant mechanism<\/strong> Regular Line of Research Project Award ; Coordinator\u00a0<\/strong>Jos\u00e9 Luiz Cat\u00e3o Dias\/FMVZ-USP; Investment R$67,661.40 (FAPESP).<\/p>\n

Scientific articles<\/em>
\nGROCH, K. R. et al<\/em>. Skeletal abnormalities in humpback whales Megaptera novaeangliae stranded in the Brazilian breeding ground. Diseases of Aquatic Organisms<\/strong>. 8 Nov 2012.<\/p>\n","protected":false},"excerpt":{"rendered":"Why are the whales dying?","protected":false},"author":475,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[159],"tags":[],"coauthors":[785],"class_list":["post-127467","post","type-post","status-publish","format-standard","hentry","category-science"],"acf":[],"_links":{"self":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts\/127467","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/users\/475"}],"replies":[{"embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/comments?post=127467"}],"version-history":[{"count":0,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts\/127467\/revisions"}],"wp:attachment":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/media?parent=127467"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/categories?post=127467"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/tags?post=127467"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/coauthors?post=127467"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}