Few studies have looked at movements of ocean predators like sharks in relation to urbanization, Hammerschlag said. Since land predators like wolves are "urban avoiders," or animals that are sensitive to human disturbance, the researchers assumed sharks would be too.
"By spending so much time close to shore, sharks are at risk of exposure to toxic pollutants as well as fishing, which could impact their health and survival," Hammerschlag said. Several hammerhead sharks circled some beachgoers at a Pensacola, Florida beach over the Memorial weekend. The study of tracked sharks near Miami noted that the ocean predators’ frequent use of urban areas may put humans at a higher risk of shark encounters. The researchers said this is especially the case "in areas where sharks may be attracted to scavenge on fish discards."
"At these marinas, anglers returning from a day of fishing commonly discard fish carcasses after removing the filets, even at marinas with no-discard regulations in place," the study notes. "Sharks are regularly seen in marinas scavenging on these fish carcasses, which may be attracting or aggregating sharks to these locations."
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