Olive ridley sea turtles have been observed nesting on California's Orange County beaches for the first time on record. Two separate female turtles laid eggs on Seal Beach and Huntington Beach in the past week.
Justin Viezbicke, California stranding coordinator for the National Oceanic and Atmospheric Association (Noaa), confirmed that this is the first documented case of a turtle nesting on the west coast. Olive ridley turtles typically lay eggs further south in Mexico and Central America.
Scientists are exploring various theories for this northward shift, including warmer coastal waters, El Niño effects, or the turtles being blown off course by a recent hurricane. Lance Adams, an aquarium veterinarian, suggested it could signal a broader northward shift in nesting patterns, potentially driven by climate change and warming ocean temperatures in their usual nesting areas.
The sex of olive ridley turtles is determined by egg incubation temperatures, with warmer conditions producing more females. Adams noted that temperatures above 87.8F result in almost all female turtles, suggesting a need for cooler nesting areas for a balanced population.
The new nests have been fenced off for protection, but local officials face challenges from predators and anticipated hurricane swells and high tides next week, which could wash away parts of the beach. The nesting season is ongoing, and additional nesting activity could occur in the next 30 to 90 days.