Journal Article
Shelf Life: Nearshore Movements, Dive Behavior, and Ecotype Status of Satellite‐Tagged Killer Whales in Pacific Mexico
Joshua D. Stewart; Robert L. Pitman; Pamela Martínez‐Loustalot; Nicola Ransome; Taylor R. Azizeh; Hiram Rosales Nanduca; Iliana A. Fonseca‐Ponce; Aldo A. Zavala‐Jiménez; Jorge Urbán R.
Marine Mammal Science · Vol. 42, Issue 2 · 2026
Abstract
Relatively little is known about the ranging patterns, diving behavior, or prey preferences of killer whales ( Orcinus orca ) in tropical latitudes. However, they are suspected to be prey‐generalists rather than the prey‐specialists that are typically found in high latitudes. In February 2025, we satellite‐tagged three killer whales from a pod of seven in Bahía de Banderas, Mexico. The tags transmitted for 8–41 days. The tagged whales traveled a total of 4002 km along a narrow, 1000 km stretch of coastline. While tagged, they remained within 50 km of shore 92.5% of the time and in water Megaptera novaeangliae ) calf, a dwarf sperm whale ( Kogia sima ), common bottlenose ( Tursiops truncatus ) and spinner ( Stenella longirostris ) dolphins, and attacking/harassing two species of sea turtles. These data provide the first high‐resolution records of movements and dive behavior of killer whales in the Eastern Tropical Pacific and support the existence of a unique ecotype in the region.