Changes in the Abundance and Distribution of Black-necked Swans (<i>Cygnus melancoryphus</i>) in the Carlos Anwandter Nature Sanctuary and Adjacent Wetlands, Valdivia, Chile

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dc.contributor.authorGonzalez, Angelica L.
dc.contributor.authorMiguel Farina, Jose
dc.date.accessioned2025-01-24T00:07:19Z
dc.date.available2025-01-24T00:07:19Z
dc.date.issued2013
dc.description.abstractRecently, the Carlos Anwandter Nature Sanctuary (Sanctuary) at the Cruces River, Chile, has undergone important ecosystem changes. Brazilian waterweed (Egeria densa), the main food resource of Black-necked Swans (Cygnus melancoryphus), has greatly decreased in abundance. This disappearance may have affected the abundance of Black-necked Swans within the Sanctuary; however, the variation in the Black-necked Swan population is still poorly understood. Spatiotemporal variation in population abundance and feeding/breeding ecology of Black-necked Swans was analyzed in the Sanctuary and adjacent wetlands (non-protected areas outside the Sanctuary) from 2000 to 2010. Temporal fluctuations in Black-necked Swan abundance were recorded, with increases in population size from late December to early June and decreases from late June to late September. Five main feeding grounds that were devoid of Brazilian waterweed were identified. However, several other aquatic plants were recorded on these grounds, suggesting that these areas provide alternative food resources for Black-necked Swans. Changes in the reproductive timing of Black-necked Swans throughout the 10-year study were recorded; no reproductive events occurred between 2004 and 2006, and a shortened reproductive period occurred between 2006 and 2010. In addition, there were changes in the locations of the breeding grounds as well as in the number of nests and chicks recorded during the study period. These results revealed new patterns in Black-necked Swan population trends as well as their distribution in areas both inside and outside the Sanctuary. Thus, to ensure effective conservation of this species requires the integration of protected areas within as well as non-protected areas outside the Sanctuary.
dc.description.funderPUG-Arauco
dc.fuente.origenWOS
dc.identifier.eissn1938-5390
dc.identifier.issn1524-4695
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101911
dc.identifier.wosidWOS:000328300100013
dc.issue.numero4
dc.language.isoen
dc.pagina.final514
dc.pagina.inicio507
dc.revistaWaterbirds
dc.rightsacceso restringido
dc.subjectBlack-necked Swan
dc.subjectCygnus melancoryphus
dc.subjectdistribution
dc.subjectpopulation abundance
dc.subjectreproductive timing
dc.subject.ods14 Life Below Water
dc.subject.ods13 Climate Action
dc.subject.ods15 Life on Land
dc.subject.odspa14 Vida submarina
dc.subject.odspa13 Acción por el clima
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.titleChanges in the Abundance and Distribution of Black-necked Swans (<i>Cygnus melancoryphus</i>) in the Carlos Anwandter Nature Sanctuary and Adjacent Wetlands, Valdivia, Chile
dc.typeartículo
dc.volumen36
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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