Researchers identify Galápagos green sea turtles staying in local waters

Researchers have identified a population of green sea turtles in the Galápagos Islands that does not appear to move from there, greenme.it reported on October 3, 2026. While marine turtles are widely known to travel thousands of kilometers across open waters using the earth's magnetic field, the sun, and ocean currents before returning to their natal beaches to breed, a research team led by the University of the Sunshine Coast in Australia discovered that these island turtles remain within local waters year-round.

University of the Sunshine Coast Tracking Reveals Stationary Galápagos Turtles

The discovery emerged from a three-year monitoring study conducted within the 198,000-square-kilometer Galápagos Marine Reserve. John W. Rowe, a coauthor of the research, stated that scientists expected the animals to migrate toward distant western Pacific beaches for reproduction. Instead, tracking data showed that none of the tagged turtles left the reserve during the entire monitoring period.

In 2015, the research team fitted electronic satellite transmitters to nine adult specimens in shallow coastal waters near four islands. The monitored group comprised seven males and two females. Tracking durations reached up to 418 days per animal, ending when transmitters detached or stopped transmitting signals.

Turtles Prefer Shallow Coastal Habitats Near Islands

The tracking data demonstrated a strong preference for shallow coastal habitats, with most individuals staying close to the islands despite occasional wanderings of up to 25 kilometers offshore. Five of the nine turtles spent the majority of the study period near a single island. Specific movement patterns varied among the subjects: Bernardo and Sara traveled between Isabela and San Cristóbal islands, while Leandro moved between Isabela and Española.

Ainoa exhibited the most extensive travel within the archipelago, moving from San Cristóbal to Santa Cruz and subsequently to Isabela. The researchers also documented a seasonal component to these localized movements, noting that travel between different islands occurred exclusively during the cooler months from April to October.

Genetic Forms and Dietary Habits in the Archipelago

The Galápagos Islands represent the only known location where two genetically distinct forms of sea turtles share the same waters. Green turtles, which typically inhabit tropical and subtropical zones of the western Pacific, mingle alongside black turtles found in the eastern Pacific, west of the Americas and south of Southern California. Adult green turtles are primarily vegetarian, shifting from a mixed diet in youth to feed mainly on marine plants and algae as they mature. Scientists observed that young green turtles grow faster than black turtles, indicating potential physiological differences that remain under investigation.

The findings were published following the conclusion of fieldwork that tracked the nine adult specimens through their shallow-water habitats. Researchers continue to examine the physiological and environmental factors keeping these populations anchored to the Galápagos Marine Reserve.