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A Study of Shark Stealth Behavior in the Proximity of Divers

Open Journal of Animal Sciences 2015年第2期5卷 224-228页

作者： Erich Ritter raid amin Department of Mathematics and Statistics University of West Florida Pensacola USA Shark Research Institute Florida Office Pensacola USA

This study examines the approach patterns of sharks in the vicinity of human divers, focusing on the diver’s body orientation and a shark’s distance from the sea bed when approaching the diver. A standardized video method was used to record the scenario of diver(s) kneeling in the sand while being approached by sharks. This showed that sharks had a preference to move in from outside a diver’s field of vision while larger sharks stayed closer to the sea floor. This may simultaneously enhance camouflage while reducing potential escape routes for the approaching animal. This stealth behavior raises the question of how sharks may interpret humans when moving towards them.

关键词： Blind Spot Camouflage Escape Routes Shark Stealth

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Does the Type of Dive Mask Matter to a Shark?

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Open Journal of Animal Sciences 2020年第3期10卷 618-626页

作者： Erich Ritter raid amin Ellie Farquhar Department of Statistics and Mathematics University of West Florida Pensacola FL USA Shark Research Institute Princeton NJ USA PHS Science Research Pawling NY USA

Eye contact with a shark is a crucial element during an interaction with a diver. Different mask frames change the size of a diver’s available field of vision, and so make a person’s eyes unequally visible from different angles, particularly when comparing mirrored to regular glass. This study examined whether it matters to a shark if it can see a diver’s eyes when getting closer. The test-subjects changed masks in a random, timed routine, while the relative distance, the absolute distance between a shark and diver expressed in a fraction of the shark’s body length, between approaching shark and human was tallied. Sharks came significantly closer (p = 0.0139) when a diver’s eyes could not be detected, showing that they orient themselves and approach based on the human’s eyes. Given that human comprehension of sharks is rudimentary, every possible benefit, even a minimal one like choosing the most optimal mask, is recommended whenever approaching sharks are likely to be encountered.

关键词： Approach Eye Contact Interruption Mask Shark

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