Green turtles took varied routes between Great Barrier Reef nesting and feeding grounds

Satellite tracking found that turtles often used different paths on their journeys to nesting beaches and back to feeding areas.

Abstract editorial illustration accompanying the article: Green turtles took varied routes between Great Barrier Reef nesting and feeding grounds

Editorial illustration — not from the study.

Researchers used satellite tracking data from eight northern Great Barrier Reef green turtles to compare their journeys from feeding areas to nesting beaches with their return journeys. They mapped the routes and compared their distances, durations and speeds, as well as how much the outward and return paths overlapped.

Outward journeys averaged 372 kilometres, compared with 252 kilometres for return journeys. The routes overlapped by only 2% to 17%, indicating that the turtles did not consistently use the same paths in both directions.

Different routes, both ways

The turtles’ outward migrations to nesting beaches were significantly longer than their return migrations to feeding areas: an average of 372 ± 136 kilometres versus 252 ± 28 kilometres. Only 2% to 17% of each turtle’s outward and return routes overlapped when the researchers compared them within a 5-kilometre buffer. The results indicate that northern Great Barrier Reef green turtles use varied migration routes rather than one consistently reused path.

Why route variety matters

Conservation plans increasingly focus on protecting migration corridors. Because these turtles may take different routes in each direction, protecting only a single pathway could miss parts of their movements and the different human-related threats they may encounter across their range.

Evidence and limits

The study analysed satellite tracking data from eight individual green turtles and used mapping software to compare their outward and return journeys. Its findings apply to the tracked turtles from the northern Great Barrier Reef; the small number of individuals means the study cannot establish how widely these movement patterns occur among green turtles more generally. The abstract reports route distances and overlap, but does not provide the results of the comparisons for migration duration or speed.

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