Work

Evidence of copulation in an anthropogenic colony of the South American sea lion, Otaria byronia (De Blainville, 1820) in Río Valdivia, Valdivia, Chile

Year: 2026

Type: article

Abstract: In Chile, the South American sea lion Otaria byronia forms colonies on exposed rocky coasts. Since the mid-1970s, a group of individuals has become established around the Valdivia fish market (VFM) (ca. 39S), southern Chile, where they regularly obtain food from fish discards provided by the fish market's sellers. Given their regular presence in the area and the lack of breeding activity, this group has been considered a non-breeding aggregation. From 2019 to 2025, researchers conducted 168 bimonthly censuses around the VFM as part of a long-term monitoring program; however, no mating events were recorded during those censuses. In December 2025, outside of census days, a copulatory event was observed in front of the VFM, indicating previously unreported reproductive behavior within this anthropogenic colony. Additionally, in April 2022, a dead pup was recorded within the Cruces River wetland, nearly 25 km north of the VFM. Together, these two reproductive-related records suggest that this anthropogenic colony may be transitioning toward a breeding structure.

Source: Latin American Journal of Aquatic Research

DOI: 10.3856/vol54-issue5-fulltext-3639

Authors: Eduardo Jaramillo, Doris Oliva, Maritza Sepúlveda, Felipe Navarro, César Barrales

Language: English

Topic: Marine animal studies overview

Subfield: Ecology

Field: Environmental Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $350

OpenAlex ID: W7225801865

FWCI:

Cites:

Cited by:

Related to: