California sea lion population rebounded to new highs

California sea lions have fully rebounded under the protection of the Marine Mammal Protection Act, with their population on the West Coast reaching carrying capacity in 2008 before unusually warm ocean conditions reduced their numbers, according to the first comprehensive population assessment of the species.

Drones confirm importance of Costa Rican waters for sea turtles

A new drone-enabled population survey – the first ever on sea turtles – shows that larger-than-anticipated numbers of turtles aggregate in waters off Costa Rica’s Ostional National Wildlife Refuge, making it one of the most important nesting beaches in the world. Scientists estimate turtle densities may reach up to 2,086 animals per square kilometer.

Ocean Acidification Changing Mussel Shell Structure

For thousands of years, California mussel shells have been made up of long, cylindrical calcite crystals organized in neat, vertical rows. But scientists have found that as ocean acidification has accelerated over the past 15 years, these shells have undergone dramatic structural changes, being built out of unorganized, uneven minerals instead.