{"id":4575,"date":"2025-03-17T08:38:25","date_gmt":"2025-03-17T12:38:25","guid":{"rendered":"https:\/\/ncseagrant.ncsu.edu\/hooklinescience\/?p=4575"},"modified":"2025-03-17T08:38:27","modified_gmt":"2025-03-17T12:38:27","slug":"can-we-predict-where-to-find-cold-stunned-sea-turtles","status":"publish","type":"post","link":"https:\/\/ncseagrant.ncsu.edu\/hooklinescience\/can-we-predict-where-to-find-cold-stunned-sea-turtles\/","title":{"rendered":"Can we predict where to find cold-stunned sea turtles?"},"content":{"rendered":"\n\n\n\n\n

New research could help optimize sea turtle search and rescue.<\/em><\/strong><\/p>\n\n\n\n

According to weather reports, the Outer Banks experienced record cold temperatures in January 2025, with some areas seeing significant snowfall due to a rare Southeastern winter storm.\u00a0<\/p>\n\n\n\n

Wintry weather doesn\u2019t just pose a risk to humans; sea turtles can become \u201ccold-stunned.\u201d Each year from December to February (or later), organizations like the Network for Endangered Sea Turtles and the N.C. Aquarium on Roanoke Island care for cold-stunned sea turtles in northeast North Carolina. Since December, staff and volunteers have rescued nearly 800 turtles, breaking a 2016 record of 600.\u00a0<\/p>\n\n\n\n

Research Need<\/strong><\/p>\n\n\n\n

Cold-stunning is a condition in which sea turtles become lethargic and are eventually unable to swim or eat. Wind and waves wash the lifeless bodies ashore. <\/p>\n\n\n\n

As reptiles, sea turtles are not able to regulate their body temperature like humans. If temperatures remain low or turtles are not rescued, they will die. <\/p>\n\n\n\n

Cold-stunning events in U.S. coastal areas on the Atlantic and Gulf of Mexico can affect thousands of sea turtles. Understanding the effects of wind and water currents on the potential stranding locations of cold-stunned sea turtles would increase chances of successful recovery of the turtles before they die.<\/p>\n\n\n\n

What did they study?<\/strong><\/p>\n\n\n\n

Biologists believe cold-stunning most often occurs in shallow bays and lagoons where water temperatures can fall quickly, as well as in areas with limited or obstructed access to warmer water due to the surrounding land. A team of scientists used Cape Cod Bay, surrounded by the hook-shaped peninsula of Cape Cod, Massachusetts, to study stranding \u201chotspots\u201d \u2014 areas where strandings occur most frequently.<\/p>\n\n\n\n

The team used four types of drifters \u2014 floats that move horizontally with water currents \u2014 and outfitted each with a satellite transmitter to record its path. The design of two of those drifters uniquely mimicked the size and shape of sea turtles that typically experience cold stun events; one drifter floated at the surface, and the other sank to the bottom, so researchers could examine the influence of deeper currents on the movements of cold-stunned sea turtles. <\/p>\n\n\n\n

Six drifter deployments took place ahead of storm fronts when temperatures were expected to drop below the cold-stunning threshold.<\/p>\n\n\n\n

What did they find?<\/strong><\/p>\n\n\n\n

There were stark differences in the paths of the different types of drifters. Hotspots for the strandings of the bottom<\/em> turtle-style drifters were different from the hotspots of the surface<\/em> turtle-style drifters.<\/p>\n\n\n\n

When comparing the sea turtle-shaped drifter strandings to reported cold-stunned sea turtle strandings from the region\u2019s Sea Turtle Stranding and Salvage Network, the researchers saw an overlap in the locations overall but not<\/em> in hotspots that the drifters\u2019 movements predicted.<\/p>\n\n\n\n

What else did they find?<\/strong><\/p>\n\n\n\n

Turtle-style bottom drifters took roughly 10 times as long to strand, providing clues as to the timing and condition of cold-stunned sea turtles. It appears free-drifting, cold-stun turtles will be transported to different regions of the coast depending on the depth of water at the point of their cold-stunning. <\/p>\n\n\n\n

Rescue volunteers have witnessed cold-stunned sea turtles stranding in pulses following cold fronts. Earlier waves arrive with most turtles alive versus later pulses, which arrive with most turtles deceased. These findings from this study suggest that the turtles that strand later originally could have been submerged.\u00a0<\/p>\n\n\n\n

So what?<\/strong><\/p>\n\n\n\n

The sea-turtle-shaped surface drifter behaved distinctly different from the traditional drifters scientists have been using to study currents and sea turtle stranding locations. Traditional drifters are not representative of sea turtle size and shape and do not assess how bottom currents affect stranding locations. <\/p>\n\n\n\n

Reading<\/strong><\/p>\n\n\n\n

Page FM, Manning J, Howard L, Healey R, Karraker NE. 2023. Developing bottom drifters to better understand the stranding locations of cold-stunned sea turtles in Cape Cod Bay, Massachusetts. PeerJ<\/em>11:e15866 https:\/\/doi.org\/10.7717\/peerj.15866<\/a><\/p>\n\n\n\n

This material is based upon work conducted by a researcher supported by the National Science Foundation Graduate Research Fellowship Program. Funding for supplies was provided by the Sophie Danforth Conservation Biology Fund, awarded by Roger Williams Park Zoo, and the University of Rhode Island Enhancement of Graduate Research Award.\u00a0<\/em><\/p>\n\n\n\n

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