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URL: http://www.ox.ac.uk/news/2019-06-12-elephants-walk-more-direct-paths-under-risk-poaching
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Title: Elephants walk more direct paths under risk of poaching | University of Oxford
Description: Elephants move faster and straighter when moving through risky areas, researchers have discovered, meandering more when safer.
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Texto: Elephants walk more direct paths under risk of poaching | University of Oxford Skip to main content Home Home Admissions Undergraduate Graduate Continuing education Research Divisions Research impact Libraries Innovation and Partnership Support for researchers Research in conversation Public Engagement with Research News & Events Events Science Blog Arts Blog Oxford and Brexit News releases for journalists Filming in Oxford Find An Expert About Organisation Facts and figures Oxford people Oxford Access International Oxford Building Our Future Jobs 牛津大学 Search News & Events Events Regular events in the University Year Race and the Curriculum Women of Achievement Science Blog Arts Blog Oxford and Brexit Latest University updates University to pay settlement fees for all EU staff EU referendum and Brexit: Analysis News releases for journalists Filming in Oxford Find An Expert Elephants move faster and straighter when moving through risky areas says a new study Credit: Nina Constable/Save the Elephants Published 12 Jun 2019 Share This Tweet Share on Facebook Share on LinkedIn Share on Reddit Home News Elephants walk more direct paths under risk of poaching Elephants walk more direct paths under risk of poaching Research Elephants move faster and straighter when moving through risky areas, researchers have discovered, meandering more when safer. The study by Save the Elephants , the University of Oxford and the University of Twente, further builds our understanding of how elephants adapt to the threat of poaching and other hostile contact with humans. Elephants often move between feeding areas that are tens of miles apart, through a landscape that carries varying levels of danger. Previous research has shown that as they move from one part of their home range to another one, they walk fast, slowing to their usual speed when they arrive. Last year, a study by the same authors showed that elephants in risky areas shift their peak activity time from day to night. Elephants moving through northern Kenya in the Samburu-Laikipia ecosystem were tracked using GPS collars between 2004 and 2014, a period when ivory poaching surged in the area. The risk to elephants varies as they pass between national reserves, community conservancies and zones of inter-tribal conflict, and is measured thanks to a UN-mandated programme called Monitoring of Illegal Killing of Elephants (MIKE), which counts elephant carcasses and records the proportion killed illegally The investigation, led by Festus Ihwagi of Save the Elephants while studying for his PhD at the University of Twente, used the tracking data to measure the ‘tortuosity’ of an elephant’s path by combining the speed of travel with turning angles when they are in the prime feeding areas.  As well as looking at elephants that moved  from one area to another, the study also looked at elephants who had stayed in one area that had become either more or less risky over time. These non-migratory elephants also changed their tortuosity in response to threat level. Lead author Festus Ihwagi, said: 'A reduction in path tortuosity implies reduced searching intensity per unit area, which in the long run might have negative implications in the foraging success of elephants in risky landscapes. Changes in path tortuosity can also serve as a useful proxy for changes in levels of illegal killing at the site level.' GPS tracking technology is used across Africa to help guide the deployment of ranger patrols (some 350 elephants are monitored by organisations using the Save the Elephants Tracking App, powered by Vulcan).  By monitoring this data for  changes in tortuosity, managers could be alerted that the elephants are experienced increased risk. The discovery could be used to give remote warning that elephants are experienced increased risk, thanks to widespread use of GPS tracking technology on elephants.   Iain Douglas-Hamilton, founder of Save the Elephants and Senior Research Associate at Oxford University’s Department of Zoology, said: 'Elephants adapt to their landscape with great sensitivity. When the risk is high, they diminish their meandering in search of food and aim to get from one point to the next in safety. By better understanding the decisions that elephants make, we can understand their needs and so help secure their future.'  The Samburu-Laikipia landscape is home to over 8,000 elephants. Save the Elephants has been studying them for over 20 years, deploying over 150 tracking collars in this time. For this study five female elephants and six males were tracked for varying lengths of time ranging from two to eight years, with their GPS position recorded hourly. In general, male elephants walk with marginally higher tortuosity than females, but poaching levels influenced the path tortuosity of both sexes similarly. Females, who live in closely-knit families, often have young calves with them and are usually more risk-averse than bull elephants, which explains their generally lower tortuosity. Key findings from the study include: Elephants in areas of high-level poaching walk with straighter paths than when in less dangerous areas. As the illegal killing of elephants increased in parts of Northern Kenya, the elephants reduced their path tortuosity Males generally walk with higher tortuosity, but both male and female elephants similarly responded to poaching by reducing their overall tortuosity. This change in elephant behaviour is adaptive to avoid risk, but has a potentially negative effect on the foraging success of elephants in risky landscapes. Read the Path Tortuosity study published online in the Journal of Wildlife Management and Wildlife Monographs . 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