David Bridges
Within the span of your life, you’ve most likely had a dream the place you’re flying. However have you ever ever dreamed about swimming underwater? Off the coast of Australia? And also you’re additionally a sea lion? Simply me?
Nicely, it feels fairly like a flying dream, solely now you don’t should dream to expertise it. A staff of researchers used “sea lion-borne video” to map out the endangered species’ habitat off the coast of south Australia. Their analysis (and photographs) is revealed immediately in Frontiers of Marine Science.
Within the movies and pictures captured from the backs of the ocean lions (Neophoca cinerea), the viewer is handled to 6 habits between 16.33 toes (5 meters) and 361 toes (110 meters) off the Australian coast. The habits are as follows: macroalgae reef, macroalgae meadow, naked sand, sponge/sand, invertebrate reef, and invertebrate boulder habitats. These habitats vary from underwater forests of algae and barren sandy flooring to advanced communities on reefs and boulders, teeming with various marine life.
“Utilizing animal-borne video and motion knowledge from a benthic predator is a very efficient manner of mapping various benthic habitats throughout massive areas of the seabed,” mentioned examine lead writer Nathan Angelakis, a researcher at The College of Adelaide and the South Australian Analysis and Improvement Institute, in a Frontiers launch. “These knowledge are helpful each for mapping crucial habitats for an endangered species such because the Australian sea lion, and extra broadly, for mapping unexplored areas of the seabed.” Benthic habitats seek advice from “something related to or occurring on the underside of a physique of water,” in line with the Nationwide Ocean Service.
The analysis staff used roughly 89 hours of footage to mannequin the habitats on the continental shelf of South Australia close to Kangaroo Island. The fashions predicted massive habitat areas within the areas off the coast. The fashions had been additionally fed oceanographic knowledge from 21 years of observations and measurements taken by completely different groups, giving a fuller image of the environments off the coast.
Strapping cameras to marine mammals will not be a brand new thought, however the latest analysis demonstrates how it may be used with conservation in thoughts. In 2022, a staff of researchers used dolphins affiliated with the U.S. Navy (sure, you learn that accurately) to seize video footage off the coast of California.
The latest staff additionally strapped satellite-linked GPS loggers to the ocean lions, permitting the researchers to trace the animals’ positions in actual time. An analogous plan of action was taken by a staff of researchers that investigated elephant seal sleep patterns in 2023; recording the positions and speeds of the animals permit researchers to trace them even when they’re deep within the ocean.
Australian sea lion populations have declined by greater than 60% during the last 4 many years, in line with a 2021 paper. The brand new movies from the animals’ backs thus serves two functions: giving researchers new knowledge on the marine atmosphere off the coasts, but additionally mapping the habitats utilized by the species in order that they could be conserved.
Daniel Mercer
Brandon Fletcher
