{"id":125199,"date":"2012-08-22T10:40:26","date_gmt":"2012-08-22T13:40:26","guid":{"rendered":"http:\/\/revistapesquisa.fapesp.br\/?p=125199"},"modified":"2015-11-27T13:21:05","modified_gmt":"2015-11-27T15:21:05","slug":"natural-radiator","status":"publish","type":"post","link":"https:\/\/revistapesquisa.fapesp.br\/en\/natural-radiator\/","title":{"rendered":"Natural radiator"},"content":{"rendered":"
\"From

thiago filadelpho<\/span>From up close you can see the vessels that supply the beakthiago filadelpho<\/span><\/p><\/div>\n

When the heat is intense, we rush to open the windows to get relief from the breeze. At the other extreme, when temperatures are low, we run to close the windows to quickly help warm up the room. This is exactly how the toucan\u2019s beak works, like an \u201cefficient thermal window, nearly the size of the area to be regulated,\u201d according to biologist Augusto Abe at the S\u00e3o Paulo State University (Unesp) at Rio Claro, who compares the toucan\u2019s beak to \u201ca powerful car radiator.\u201d Their capacity to regulate temperatures was announced in July 2009 in a study conducted by the team led by Abe in partnership with Canadian Glenn Tattersall from Brock University, published in Science magazine. In order to reach this conclusion, however, the team had to travel a circuitous, and inquisitive, route.<\/p>\n

The story began in 1985 when Abe received a toucan as a gift. Although the bird had no official name, the biologist\u2019s closest friends called it \u2018Amadeus\u2019. As it settled down for the night, Amadeus would turn its head around and tuck its beak under its tail, using its wings as blankets. The scene attracted the attention of the biologist who, when touching the beak, found that it was warm. He therefore thought that all the trouble the toucan went through was a trick that allowed it to keep its body warm. At that time, however, Abe did not have the appropriate equipment needed to measure the beak\u2019s temperature and study it in more detail. But the sight of the bird covering and protecting itself for sleeping stuck in the biologist\u2019s mind.<\/p>\n

In 2003, the Unesp team received a visit from Tattersall, with whom Abe had already been in partnership on several projects. In his suitcase, the Canadian carried an infrared camera, which on that occasion was to be used to evaluate heat production in snakes after feeding. An idea suddenly occurred to Abe who, without wasting another minute, took his Canadian colleague to the zoo in Americana, a city in the interior of S\u00e3o Paulo state (Campinas region) that housed a toucan vivarium. They took several pictures of the bird with the special camera. \u201cThe outcome was frustrating because nothing happened,\u201d Abe recalls. But as they were on their way out, they decided to take one last picture just to set their minds at ease. \u201cThat\u2019s when we noticed that the beak was quick to warm up and cool down,\u201d the Brazilian says. So they agreed to study toucan beaks together.<\/p>\n

\"Thermal

thiago filadelpho<\/span>Thermal image shows where the heat is concentrated (in yellow<\/em>)thiago filadelpho<\/span><\/p><\/div>\n

In 2005, they began to conduct studies in a climate-controlled enclosure in the laboratory, at temperatures between 10 and 25\u00b0C. There, a thermographic camera was installed to photograph toucans of the species Ramphastos toco, native to the Brazilian cerrado. The camera was responsible for producing images along the color spectrum, ranging from yellow (hotter) to blue (colder). The temperature was slowly increased or decreased over a 12-hour period each day.<\/p>\n

The pictures showed in great detail that when the ambient temperature was cold, the toucan cut off the flow of heat to the beak, which then cooled down to retain warmth in its body. Inversely, when the heat in the laboratory vivarium was intense, the toucan increased blood flow to the beak, which was responsible for dispersing the excess heat into the environment. Depending on the situation, the beak was able to disperse 25-400% of all the heat produced by the bird at rest. \u201cWe adjusted our previous thinking that the beak served only for feeding, peeling fruit or attacking other nests and we discovered that the organ has other relevant functions,\u201d says biologist Denis Andrade, co-author of the paper and researcher at Unesp Rio Claro. He believes this capability still needs to be studied more closely in order to obtain a more comprehensive understanding of the toucan\u2019s anatomy, ecology and evolution.<\/p>\n

The study was financed by the National Institute of Science and Technology (INCT) in Comparative Physiology, established and maintained by the National Council on Scientific and Technological Development (CNPq) and FAPESP, which sets up partnerships with the Coordinating Agency for the Improvement of Higher Education Personnel (Capes) and the National Bank for Economic and Social Development (BNDES) to promote and connect groups that operate on the frontiers of scientific knowledge and in areas that are of strategic interest to Brazil. There are currently 128 institutions like this throughout Brazil.<\/p>\n

In expanding upon the original project, the Rio Claro team was able to show that the toucan\u2019s ability to adapt to temperature changes is very quick \u2013 it takes about ten minutes for the birds to adjust and respond to ambient temperatures that drop sharply from 25 to 10\u00b0C. \u201cThis confirms that the beak is actually a very good thermal regulator,\u201c adds Andrade. By the end of the year the group hopes to publish promising new information about thermoregulation in wasps and flies.<\/p>\n

Project
\n<\/strong>National Institute of Science and Technology in Comparative Physiology (n\u00ba 2008\/57712-4<\/a>) (2009 2014);\u00a0Grant mechanism<\/strong> Thematic Project; Coordinator\u00a0<\/strong>Augusto Shinya Abe \u2013 Unesp\/Rio Claro; Investment <\/strong>R$ 1,084,648.98<\/p>\n

Scientific article<\/em>
\nTATTERSALL, G. J. et al<\/em>. Heat Exchange from the Toucan Bill Reveals a Controllable Vascular Thermal Radiator<\/a>, Science.<\/strong> v. 325, n. 5939, p. 468-70, 2009.<\/p>\n

From our archives
\n<\/strong>Efficient radiator –<\/em>\u00a0Issue 162 \u2013 August 2009
\nToucan beaks work like radiators –<\/em> Online – Issue \u2013 July 23, 2009<\/p>\n","protected":false},"excerpt":{"rendered":"The toucan\u2019s beak is an efficient heat sink","protected":false},"author":18,"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":[1237],"tags":[266],"coauthors":[109],"class_list":["post-125199","post","type-post","status-publish","format-standard","hentry","category-biology-special-2","tag-zoology"],"acf":[],"_links":{"self":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts\/125199","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\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/comments?post=125199"}],"version-history":[{"count":0,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts\/125199\/revisions"}],"wp:attachment":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/media?parent=125199"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/categories?post=125199"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/tags?post=125199"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/coauthors?post=125199"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}