A continent-wide search for Antarctic petrel breeding sites with satellite remote sensing

• Published in: Remote sensing of environment Vol. 210; pp. 444 - 451
• Main Authors: Schwaller, Mathew R., Lynch, Heather J., Tarroux, Arnaud, Prehn, Brandon
• Format: Journal Article
• Language: English
• Published: New York Elsevier Inc 01.06.2018; Elsevier BV
• Subjects: Algorithms; Animal breeding; Antarctic petrel; Antarctic region; Antarctica; Birds; breeding; Breeding colony; Breeding of animals; Breeding sites; Colonies; Detection; Ecological monitoring; ecosystems; Flying seabirds; Guano; Landsat; Landsat satellites; Marine ecosystems; monitoring; Nunataks; Polls & surveys; Procellariidae; Remote monitoring; Remote sensing; Satellite imagery; Satellites; Shorelines; surveys; Thalassoica antarctica; Wildlife management; Southern Ocean; Antarctica; Antarctic region; Breeding colony; Landsat; Thalassoica antarctica; Antarctica; Guano; Antarctic petrel; Flying seabirds
• DOI: 10.1016/j.rse.2018.02.071
• ISSN: 0034-4257

The Antarctic petrel (Thalassoica antarctica) has been identified as a key species for monitoring the status and health of the Southern Ocean and Antarctic ecosystems. Breeding colonies of the Antarctic petrel are often found on isolated nunataks far from inhabited stations, some up to hundreds of kilometers from the shoreline. It is difficult therefore to monitor and census known colonies, and it is believed that undiscovered breeding locations remain to be found. We developed an algorithm that can detect Antarctic petrel colonies and used it to complete a continent-wide survey using Landsat-8 Operational Line Imager (OLI) imagery in Antarctica up to the southernmost extent of Landsat's orbital view at 82.68°S. Our survey successfully identified 8 known Antarctic petrel colonies containing 86% of the known population of Antarctic petrels. The survey also identified what appears to be a significant population of breeding birds in areas not known to host breeding Antarctic petrel colonies. Our survey suggests that the breeding population at Mt. Biscoe (66°13′S 51°21′E), currently reported to be in the 1000s, may actually be on the order of 400,000 breeding pairs, which would make it the largest known Antarctic petrel breeding colony in the world. The algorithm represents a first-ever attempt to apply satellite remote sensing to assess the distribution and abundance of the Antarctic petrel on a continent-wide basis. As such, we note several algorithm shortcomings and identify research topics for algorithm improvement. Even with these caveats, our algorithm for identifying Antarctic petrel colonies with Landsat imagery demonstrates the feasibility of monitoring their populations using satellite remote sensing and identifies breeding locations, including Mt. Biscoe, that should be considered high priorities for validation with directed field surveys. •Found Antarctic petrel breeding areas using Landsat-8 Operation Line Imager data.•Surveyed the entire continent of Antarctica for Antarctic petrel colonies.•Found 86% of the known Antarctic petrel breeding population.•Discovered previously unknown Antarctic petrel breeding colonies.•Discovered perhaps the largest Antarctic petrel breeding colony in the world.