News — FT. LAUDERDALE-DAVIE, Fla. --- Stingrays living in one of the world鈥檚 most famous and heavily visited ecotourism sites 鈥� Stingray City/Sandbar in the Cayman Islands 鈥� have profoundly changed their ways, raising questions about the impact of so-called 鈥渋nteractive ecotourism鈥� on marine wildlife, reports a new study published March 18 in the journal PLOS ONE.
Researchers from Nova Southeastern University鈥檚 Guy Harvey Research Institute in Hollywood, Fla. and the University of Rhode Island studied the southern stingray population of Stingray City 鈥� a sandbar in the Cayman Islands that draws nearly a million visitors each year to feed, pet and swim with its stingrays 鈥� to assess how the intensive ecotourism has affected the animals鈥� behavior.
鈥淢easuring that impact is important because there鈥檚 a lot of interest in creating more of these interactive ecotourism operations, but we know little about the life histories of the animals involved or how they might change,鈥� said study co-author Guy Harvey, who initiated the project.
The researchers found that Stingray City鈥檚 stingrays show distinctly different patterns of activity than their wild counterparts, who don鈥檛 enjoy daily feedings or close human contact.
鈥淲e saw some very clear and very prominent behavioral changes, and were surprised by how these large animals had essentially become homebodies in a tiny area,鈥� said study co-author Mahmood Shivji, director of the Guy Harvey Research Institute and NSU Oceanographic Center professor, who led the study.
Wild stingrays are active at night and solitary 鈥� they forage through the night over large distances to find food, and rarely cross paths with other stingrays. To see if Stingray City鈥檚 fed stingrays stray from this behavior, Mark Corcoran, lead author of the study who did the research as part of his graduate work at NSU, and the research team tagged and monitored both wild and fed stingrays over the course of two years and compared their patterns of movement.
They found that fed stingrays swapped their normal nighttime foraging for daytime feeding, and in contrast to their wild counterparts, began to rest at night. They also didn鈥檛 mind rubbing shoulders with their neighbors: At least 164 stingrays abandoned the species鈥� normal solitary behavior, crowding together in less than a quarter square mile of space at Stingray City. They even formed schools and fed together. The fed stingrays mated and became pregnant year-round, instead of during a specific mating season, and also showed signs of unusual aggression, biting each other more frequently than their wild counterparts.
These results suggest that human-provided food can dramatically change how even large, highly mobile ocean animals behave 鈥� with potentially serious consequences, the researchers conclude.
鈥淭here are likely to be some health costs that come with these behavior changes, and they could be detrimental to the animals鈥� well-being in the long term,鈥� Shivji said. Stingray City means big business in the Cayman Islands, where each stingray generates as much as $500,000 annually in tourism income, Harvey said. The team plans to continue to monitor Stingray City鈥檚 population to track its health 鈥� and the industry鈥檚 impact 鈥� over time.
鈥淩ight now, these animals have no protection at all,鈥� Harvey said. 鈥淲ithout more studies like these, we won鈥檛 know what that means for the wildlife or if we need to take action. It鈥檚 unclear how much of the stingray鈥檚 daily diet comes from tourism provided food, but the good news is we have seen the animals forage when tourists are absent suggesting that these animal are not completely dependent on these handouts.鈥�
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About Guy Harvey: Guy Harvey is a marine wildlife artist and conservationist who earned a Ph.D. in Fisheries Biology. His depictions of marine life, especially of sportfish such as marlin, are very popular with sport fishermen and have been reproduced in prints, posters, t-shirts, jewelry, clothing, and other consumer items. Harvey is also a very vocal and active advocate for marine conservation, having established the Guy Harvey Research Institute at Nova Southeastern University of Fort Lauderdale, Florida as well as the Guy Harvey Ocean Foundation, an organization that funds marine conservation research and educational initiatives.www.guyharvey.com
About Nova Southeastern University鈥檚 Guy Harvey Research Institute: Established in 1999, the Guy Harvey Research Institute (GHRI) at NSU is a collaboration between the renowned marine artist, scientist and explorer, Dr. Guy Harvey, and Nova Southeastern University's Oceanographic Center. The mission of the GHRI is to provide the scientific information necessary to understand, conserve, and effectively manage the world's marine fishes and their ecosystems. The GHRI is one of only a handful of private organizations dedicated exclusively to the science-based conservation of marine fish populations and biodiversity. The research, education and outreach activities of the GHRI are supported by the Guy Harvey Ocean Foundation, AFTCO Inc., extramural research grants, philanthropic donations by private businesses and individuals, and NSU.
About Nova Southeastern University: Situated on 300 beautiful acres in Davie, Florida, Nova Southeastern University is a dynamic fully accredited research institution dedicated to providing high-quality educational programs at all levels. NSU is the eighth largest not-for-profit independent institution nationally with more than 28,000 students. NSU awards associate鈥檚, bachelor鈥檚, master鈥檚, specialist, doctoral and first-professional degrees in a wide range of fields. Classified as a research university with 鈥渉igh research activity鈥� by the Carnegie Foundation for the Advancement of Teaching, NSU is one of only 37 universities nationwide to also be awarded Carnegie鈥檚 Community Engagement Classification.
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