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Population Status of the Kermadec Petrel (Pterodroma neglecta juana) at San Ambrosio Island, Chile
Citation
MARÍN, M., GONZÁLEZ, R. & TRUCCO, S. 2020. Population Status of the Kermadec Petrel (Pterodroma neglecta juana) at San Ambrosio Island, Chile.
Marine Ornithology 48: 209
- 214
http://doi.org/10.5038/2074-1235.48.2.1375
Received 24 April 2020, accepted 18 May 2020
Date Published: 2020/10/15
Date Online: 2020/07/26
Key words: Kermadec Petrel, Pterodroma neglecta juana, population, breeding seasonality, introduced mammals, eastern South Pacific, Chile
Abstract
We visited San Ambrosio Island off northern Chile (26°21′S, 079°47′W) on 10-12 December 2019. We found a large population of Kermadec Petrel Pterodroma neglecta juana that appeared to be healthy. In the area that we could survey, we estimated at least 22 686 breeding pairs, which is an underestimate of the entire population as we could not access some steep areas. Introduced mammals, which have since been eradicated, caused a loss of island vegetation that might be a drawback for this population, as shading from the sun appears to be important for nest-site selection. Egg-laying started by early December. We assessed 223 birds with respect to coloration: most birds were intermediate phase (65%) and the rest were either very dark (23%) or very pale (12%). We found skeletal remains of goats and rabbits on the island but no living mammals, although a single goat may still be alive. In the context of an estimated world population of ~100 000 pairs of Kermadec Petrel, the San Ambrosio Island population contributes significantly.
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