Light-induced Petrel Groundings in New Caledonia

Area of Science:

• Ornithology
• Environmental Science
• Conservation Biology

Background:

• Artificial light pollution is a growing threat to nocturnal seabirds globally.
• Petrel species in New Caledonia are vulnerable to light-induced disorientation.
• Understanding grounding patterns is vital for effective conservation strategies.

Purpose of the Study:

• To identify petrel species affected by artificial light pollution in New Caledonia.
• To describe spatial and temporal patterns of light-induced seabird groundings.
• To determine factors influencing these groundings and inform mitigation policies.

Main Methods:

• Field observations and citizen science network for reporting grounded birds (2007-2009).
• Mapping of groundings across Grande Terre and Nouméa.
• Negative binomial regression to analyze light intensity and proximity to shore effects.

Main Results:

• 523 grounded seabirds recorded; 80.2% were wedge-tailed shearwaters, 14.2% Gould's petrels, 5.4% Tahiti petrels.
• Fledglings constituted an estimated 64.9% of all grounded individuals.
• Light intensity and proximity to shore were significant positive factors; groundings peaked during fledging seasons and were concentrated near industrial sites and airports.

Conclusions:

• Artificial lighting detrimentally affects wedge-tailed shearwaters, Gould's petrels, and Tahiti petrels in New Caledonia.
• Threatened and near-threatened species are particularly impacted, highlighting conservation concerns.
• Urgent implementation of light reduction policies is recommended for affected areas and periods.