Een nieuw onderzoek zwengelt de discussie opnieuw aan. Why do zebras have black and white stripes? They found that beyond 50 meters (about 164 feet) in daylight or 30 meters (about 98 feet) at twilight, when most predators hunt, stripes can be seen by humans but are hard for zebra predators to distinguish. Want to bookmark your favourite articles and stories to read or reference later? Tim Caro, co-author of the study and a UC Davis professor of wildlife biology, said: “The results from this new study provide no support at all for the idea that the zebra’s stripes provide some type of anti-predator camouflaging effect. Findings from their study will be published Friday, Jan. 22, in the journal PLOS ONE. All rights reserved. In earlier studies, Caro and other colleagues have provided evidence suggesting that the zebra’s stripes provide an evolutionary advantage by discouraging biting flies, which are natural pests of zebras. “We, instead, carried out a series of calculations through which we were able to estimate the distances at which lions and spotted hyenas, as well as zebras, can see zebra stripes under daylight, twilight, or during a moonless night.". For other inquiries, Contact Us. “The most longstanding hypothesis for zebra striping is crypsis, or camouflaging, but until now the question has always been framed through human eyes,” said the study’s lead author, Amanda Melin, an assistant professor of biological anthropology at the University of Calgary, Canada. De afgelopen jaren is de ene na de andere hypothese opgeworpen. De onderzoekers bestudeerden zebra’s die in Tanzania leefden. Zo stal ruimtesonde OSIRIS-REx wat materiaal van planetoïde Bennu, De pest greep in de 17e eeuw vier keer sneller om zich heen dan 300 jaar eerder, Vrijwel onbreekbare kever geeft zelfs geen krimp als er een auto overheen rijdt, Omstreden sterrenstelsel blijkt toch niet voor 99,99 procent uit donkere materie te bestaan, Wetenschap onthult hoe het coronavirus onze cellen kraakt, Corona kaart internationaal (John Hopkins). We simulated a biologically motivated motion detection algorithm to analyse motion signals generated by different areas on a zebra's body during displacements of their retinal images. A zebra's stripes are known to protect it from blood-sucking insects, as well as acting as camouflage. While zebras can see stripes over further distances than their predators can, scientists noted other species, closely related to the zebra, are highly social and able to recognise each other easily despite having no striping. "The Sun", "Sun", "Sun Online" are registered trademarks or trade names of News Group Newspapers Limited. Ze wijzen erop dat er in deze gebieden genoeg dieren leven die nauw verwant zijn aan de zebra, zeer sociaal zijn en ondanks dat ze geen strepen hebben, toch prima in staat zijn om elkaar te herkennen.

In open, treeless habitats - where zebras spend the majority of their time - researchers found lions could see the outline of striped zebras just as easily as they could see similar size prey without the monochrome pattern. By continuing you agree to the use of cookies.
The functional significance of the zebra coat stripe pattern is one of the oldest questions in evolutionary biology, having troubled scientists ever since Charles Darwin and Alfred Russel Wallace first disagreed on the subject.
Op basis daarvan schatten ze vanaf welke afstand leeuwen en hyena’s overdag, in de schemering en ‘s nachts in staat waren om de strepen van de zebra te zien. To see all content on The Sun, please use the Site Map. On moonless nights the stripes are difficult for all species to see beyond nine metres. Connecting our research and expertise to the effort to feed a growing population under a changing climate. How did zebras get their stripes? Overdag blijken de meeste roofdieren de strepen van een afstandje van zo’n vijftig meter te kunnen zien. Ze bekeken de zebra’s met speciale filters die de zebra’s lieten zien zoals leeuwen en hyena’s ze zien. Copyright © 2020 Elsevier B.V. or its licensors or contributors. While zebras can see stripes over somewhat further distances than their predators can, the researchers also noted that other species of animals that are closely related to the zebra are highly social and able to recognize other individuals of their species, despite having no striping to distinguish them. While different theories have been put forward to address this question, the idea that the stripes act to confuse or ‘dazzle’ observers remains one of the most plausible. To test the hypothesis that stripes camouflage the zebras against the backdrop of their natural environment, the researchers passed digital images taken in the field in Tanzania through spatial and color filters that simulated how the zebras would appear to their main predators — lions and spotted hyenas — as well as to other zebras. Zoologists believe stripes offer zebras protection from predators in a couple of different ways. Advancing the study of medicine as a worldwide leader in human health and veterinary sciences. However, the common consensus that zebra stripes are used as camouflage to protect them from predators has been refuted in a new study. Ze wilden zo achterhalen of de strepen een sociale functie konden hebben en zebra’s elkaar bijvoorbeeld aan hun strepen konden herkennen. Wetenschappers hebben de zebra door de ogen van zijn natuurlijke vijanden – de leeuw en de hyena – bekeken en stellen op basis van dat onderzoek dat de strepen van de zebra geen camouflagefunctie hebben. De leeuw en hyena “Instead, we reject this long-standing hypothesis that was debated by Charles Darwin and Alfred Russell Wallace.”. Please be respectful when making a comment and adhere to our Community Guidelines. Copyright © 2013 Elsevier GmbH. The black-and-white beasts evolved their distinctive coat to help them dodge blood-sucking parasites on the plains of Africa. Zebra's stripes make it tricky for horse flies to land. There’s no way to look back into evolutionary history and pinpoint the reason for the wild equids' distinctive decorations. If you’ve always thought of a zebra’s stripes as offering some type of camouflaging protection against predators, it’s time to think again, suggest scientists at the University of Calgary and UC Davis. De strepen zouden dienst doen als camouflage, ze zouden steekvliegen op afstand houden of een sociale functie hebben. University of California, Davis, One Shields Avenue, Davis, CA 95616 | 530-752-1011. We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. Funding for the study was provided by the Wenner Gren Foundation, the National Sciences and Research Council of Canada, the National Geographic Society and UC Davis. Zebra Stripes Not for Camouflage, New Study Finds, International Baccalaureate (IB) Higher Level Examination Credit, Graduate and Professional School Students, UC Davis Health Stadium Commencement Ceremonies, Undergraduate Graduation Filing Deadlines, Commencement Schedule and Graduation Celebrations, College of Agricultural and Environmental Sciences, Center for Professional Practice of Nursing (CPPN), Robert Arneson: Serious Ideas Behind that Humor, Why zebras have stripes: The debate goes on, Scientists solve the riddle of zebras’ stripes, Unfold Podcast, Episode 4, E-commerce and Climate Change, Unfold Podcast Launches Season 2 Focused on Climate Change, Wildfire on the Rise Since 1984 in Northern California’s Coastal Ranges, Plastic Found in Southern Right Whale in Argentina, ‘CRISPR and Coronavirus’: Hear From Nobel Winner Jennifer Doudna, UC Davis Continuing and Professional Education. Zebra stripes are not for camouflage, scientists confirm.

The stripes on zebras have been found to repel flies.

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