Variación estacional e interanual de la población de cisnes de cuello negro Cygnus melancoryphus (Anseriformes: Anatidae) en el humedal marino de Caulín, Chiloé, sur de Chile

Jaime R. Rau; Jaime A. Cursach

doi:10.30550/j.azl/2155

Authors

Jaime R. Rau Laboratorio de Ecología, Departamento de Ciencias Biológicas y Biodiversidad, Universidad de Los Lagos, Osorno, Chile https://orcid.org/0000-0003-0444-578X
Jaime A. Cursach Fundación Conservación Marina, Puerto Montt, Chile https://orcid.org/0000-0002-3251-4474

DOI:

https://doi.org/10.30550/j.azl/2155

Keywords:

Abundance, eBird platform, nomadic waterfowl, trends

Abstract

The global decline of waterfowl populations is a major concern, particularly for endemic species such as the Black-necked Swan (Cygnus melancoryphus), which faces threats like habitat loss, pollution, and climate change. This study examines seasonal and interannual variation in the
abundance of this species at the Caulín marine wetland, Chiloé, Chile, from 2010 to 2023, using data from the eBird platform. Abundance trends and their correlation with the “El Niño” phenomenon were explored. Results show a decreasing trend in the species’ abundance over
the study period, with the highest concentrations recorded in spring and notable interannual fluctuations. No significant correlation was found with the El Niño Oceanic Niño Index (ONI). This study highlights the need for further research on the local changes that are affecting
the abundance of waterbirds in marine wetlands in the region.

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