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The site was identified as important in 2020 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:

Species	Red List1	Season	Year(s)	Size	IBA criteria
Red-legged Cormorant Poikilocarbo gaimardi	NT	resident	2016-2020	2-38 individuals	B1a
Guanay Cormorant Leucocarbo bougainvilliorum	NT	resident	2016-2020	28-3,000 individuals	B1a
Black Skimmer Rynchops niger	LC	non-breeding	2016-2020	1,800 individuals	A4
Franklin's Gull Larus pipixcan	LC	non-breeding	2008	10,000-19,999 individuals	A4i
Inca Tern Larosterna inca	NT	non-breeding	2016-2020	4-28 individuals	B1a
Elegant Tern Thalasseus elegans	NT	non-breeding	2016-2020	10-100 individuals	A4, B1a

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2020) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2020. The most recent assessment (2017) is shown below.

State (condition of the trigger species' populations)
Species	Reference	Actual	Units	% remaining	Result
Peruvian Pelican Pelecanus thagus	2,000	1,538	individuals	77	near favourable
Black Skimmer Rynchops niger	4,500	4,500	individuals	100	favourable
Franklin's Gull Larus pipixcan	40,000	40,000	individuals	100	favourable
Elegant Tern Thalasseus elegans	4,030	1,800	individuals	45	unfavourable

State (condition of the trigger species' habitats)
Habitat	Quantity (% remaining)	Quality (% carrying capacity)	Result
Marine Coastal/Supratidal	very poor (< 40%)	poor (40-69%)	very unfavourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Transportation and service corridors	happening now	some of area/population (10-49%)	moderate to rapid deterioration	high
Pollution	past (and unlikely to return) and no longer limiting	some of area/population (10-49%)	moderate to rapid deterioration	low

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other action	Result
Little/none of site covered (<10%)	No management planning has taken place	Very little or no conservation action taking place	negligible

Habitat1	Habitat detail	% of IBA
Marine Neritic		major (>10)
Marine Coastal/Supratidal		-

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Desembocadura del Río Bío-Bío (Chile). Downloaded from https://datazone.birdlife.org/site/factsheet/desembocadura-del-río-bío-bío-iba-chile on 23/11/2024.