Correcting for heterogeneous availability bias in surveys of long-diving marine turtles.

Highlights: [•] During surveys, diving taxa must often be at or near the surface to be detected. [•] We studied effects of variation in sea turtle diving on analyses of sightings data. [•] Several analyses were biased or confounded by spatiotemporal variation in diving. [•] Long winter dives led to negative detection bias and density underestimates. [•] Diving and depth use studies are needed for the conservation of diverse divers. [ABSTRACT FROM AUTHOR]