{"id":6897,"date":"2021-03-19T12:19:32","date_gmt":"2021-03-19T12:19:32","guid":{"rendered":"https:\/\/dailyrapidnews.com\/eng\/?p=6897"},"modified":"2021-03-19T12:19:32","modified_gmt":"2021-03-19T12:19:32","slug":"scientists-dont-know-why-all-these-sea-creatures-are-swimming-in-circles","status":"publish","type":"post","link":"https:\/\/dailyrapidnews.com\/eng\/2021\/03\/19\/scientists-dont-know-why-all-these-sea-creatures-are-swimming-in-circles\/","title":{"rendered":"Scientists Don’t Know Why All These Sea Creatures Are Swimming in Circles"},"content":{"rendered":"
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Marine researchers in Japan and elsewhere have discovered yet another enigma of the aquatic world. In a new paper out Thursday, they detail their finding that various species of large sea animals, from turtles to sharks to seals, swim in circles for no clear reason. This circling could have several purposes for the animals, such as aiding their navigation or foraging for food, the researchers say.<\/p>\n

\"Ocean-animals-swim-in-circles-but-scientists-Scientists-Dont-Know-Why-All-These-Sea-Creatures-Are-Swimming-in-Circles-rapidnews-dailyrapid\"<\/p>\n

According to the researchers, recent advances in technology have allowed scientists to get a fuller picture of how animals in the ocean move through their environment with much better precision than before. Lead author Tomoko Narazaki, from the University of Tokyo, and her colleagues decided to put this tech to good use by looking at the movements of green sea turtles during their nesting season, when female turtles return to their birthplace to lay eggs.<\/p>\n

They moved turtles from their nesting location to elsewhere, so that they could observe how they navigated back to the original spot. But once they did, they spotted a peculiar pattern: the turtles would often circle at a relatively constant speed at least twice around, then go back to their normal swimming as they ventured back home.<\/p>\n

Curious, Narazaki told others in her field about the discovery. Eventually, she teamed up with some of these researchers to look back at movement data that had been collected earlier about a range of other marine animals across different branches of the evolutionary tree. And sure enough, they found the same sort of circling behavior pop up repeatedly. These circling animals included fish (tiger sharks), birds (king penguins), and mammals (Antarctic fur seals and Cuvier\u2019s beaked whales).<\/p>\n

Their work is\u00a0published\u00a0in iScience.<\/p>\n

\u201cAll of the data used in our study was initially collected for different purposes (e.g., to study foraging behavior of sharks etc.). Data of each species was analyzed by different co-authors for different aspects,\u201d Narazaki told Gizmodo in an email. \u201cSo, it took a while for us to realize that this circling is a common behavior across many species\u2014until we collaborated.\u201d<\/p>\n

On the surface, circling is hardly practical for these animals\u2019 survival, since the most energy-efficient way to travel anywhere in the ocean is usually a straight line. So that probably means it has one or more important functions that are worth the extra effort. Right now, though, all the team has are some educated guesses as to what\u2019s going on, which may vary between different species.<\/p>\n

\"Ocean-animals-swim-in-circles-but-scientists-Scientists-Dont-Know-Why-All-These-Sea-Creatures-Are-Swimming-in-Circles-rapidnews-dailyrapid-dailyrapidnews\"<\/p>\n

The sharks, for instance, seem to circle most often around where they get food, indicating that it provides some advantage in hunting. Meanwhile, other research has\u00a0shown\u00a0that some species of whales will use circling in groups as a way to create \u201cbubble nets\u201d to catch their small fish prey. But feeding likely isn\u2019t the only purpose for circling.<\/p>\n

In at least one male tiger shark, the team found evidence that circling was part of its courtship ritual in front of a female. Seals and penguins seem to circle most often near the water\u2019s surface or outside of their typical foraging hours, both of which indicate it isn\u2019t part of their feeding technique. The team also cited earlier research that found northern elephant seals will circle during their drift dives\u2014lazy, passive dives that help them rest or process their last meal.<\/p>\n

In the turtles, the circling may help them reorient their navigation skills, which rely on smell, sight, and sensing magnetic fields. The turtles would frequently circle just before the last stretch of their journey, and for a while, too. One turtle was observed to circle a whopping 76 times before moving on.<\/p>\n

\u201cGiven that similar circling behavior was observed across a wide variety of marine megafauna taxa, it might be possible that it is a behavioral convergence having similar purposes,\u201d Narazaki said. \u201cBut, for now, the purpose and the function of this behavior remain unknown.\u201d<\/p>\n

Of course, we know that lots of animals on land circle for various reasons (just ask your\u00a0nearest dog before he poops). But the obscurity of the vast ocean means there are probably all sorts of behaviors commonplace among these animals that we simply haven\u2019t gotten to see yet. By studying the how and why of marine circling more closely, the researchers hope to illuminate this almost alien world a bit more.<\/p>\n

\u201cFor the next step, we would like to examine animal movements in relation to animals\u2019 internal state and environmental conditions to examine why they circle,\u201d Narazaki said. \u201cSome hypothesis-testing experiments would be necessary to understand the function and mechanism underlying circling movements.\u201d<\/p>\n<\/div>\n

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Marine researchers in Japan and elsewhere have discovered yet another enigma of the aquatic world.<\/p>\n","protected":false},"author":1,"featured_media":6899,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":""},"categories":[5],"tags":[],"class_list":["post-6897","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science"],"yoast_head":"\nScientists Don't Know Why All These Sea Creatures Swim in Circles<\/title>\n<meta name=\"description\" content=\"Marine researchers in Japan and elsewhere have discovered yet another enigma of the aquatic world. 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A hidden world of aquatic life 500m beneath the ice in Antarctica has been discovered, complete with shrimp-like creatures in a vast cathedral-like cavern. New\u2026","rel":"","context":"In "News"","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":11538,"url":"https:\/\/dailyrapidnews.com\/eng\/2021\/05\/29\/bats-know-the-speed-of-sound-from-birth-scientists-discovery\/","url_meta":{"origin":6897,"position":5},"title":"Bats know the speed of sound from birth, scientists discovery","date":"May 29, 2021","format":false,"excerpt":"A new Tel Aviv University study has revealed, for the first time, that bats know the speed of sound from birth. In order to prove this, the researchers raised bats from the time of their birth in a helium-enriched environment in which the speed of sound is higher than normal.\u2026","rel":"","context":"In "Science"","img":{"alt_text":"bats-already-know-echolocation-since-birth-unlike-other-animals-research-reveals-rapidnews","src":"https:\/\/i0.wp.com\/dailyrapidnews.com\/eng\/wp-content\/uploads\/2021\/05\/bats-already-know-echolocation-since-birth-unlike-other-animals-research-reveals-rapidnews-e1622290227434.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]}],"_links":{"self":[{"href":"https:\/\/dailyrapidnews.com\/eng\/wp-json\/wp\/v2\/posts\/6897","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dailyrapidnews.com\/eng\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dailyrapidnews.com\/eng\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dailyrapidnews.com\/eng\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dailyrapidnews.com\/eng\/wp-json\/wp\/v2\/comments?post=6897"}],"version-history":[{"count":1,"href":"https:\/\/dailyrapidnews.com\/eng\/wp-json\/wp\/v2\/posts\/6897\/revisions"}],"predecessor-version":[{"id":6902,"href":"https:\/\/dailyrapidnews.com\/eng\/wp-json\/wp\/v2\/posts\/6897\/revisions\/6902"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dailyrapidnews.com\/eng\/wp-json\/wp\/v2\/media\/6899"}],"wp:attachment":[{"href":"https:\/\/dailyrapidnews.com\/eng\/wp-json\/wp\/v2\/media?parent=6897"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dailyrapidnews.com\/eng\/wp-json\/wp\/v2\/categories?post=6897"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dailyrapidnews.com\/eng\/wp-json\/wp\/v2\/tags?post=6897"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}