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Distribution of Olrog’s Gull Larus atlanticus from Bahía San Blas during the non-breeding period: signals of partial migration

Published online by Cambridge University Press:  05 May 2020

SOFÍA COPELLO Open the ORCID record for SOFÍA COPELLO [Opens in a new window] ,
NICOLÁS SUÁREZ ,
PABLO YORIO ,
MARÍA T. RAVASI ,
JESICA A. PAZ ,
PABLO GARCÍA BORBOROGLU ,
MARICEL GRAÑA GRILLI ,
MARCO FAVERO  and
JUAN P. SECO PON
SOFÍA COPELLO*
Affiliation:
Instituto de Investigaciones Marinas y Costeras (IIMyC, UNMdP, CONICET) - Facultad de Ciencias, Exactas y Naturales, Mar del Plata, Argentina.
NICOLÁS SUÁREZ
Affiliation:
CONICET CENPAT Centro para el Estudio de Sistemas Marinos, Puerto Madryn, Chubut, Argentina.
PABLO YORIO
Affiliation:
CONICET CENPAT Centro para el Estudio de Sistemas Marinos, Puerto Madryn, Chubut, Argentina. Wildlife Conservation Society Argentina, Buenos Aires, Argentina.
MARÍA T. RAVASI
Affiliation:
Instituto de Investigaciones Marinas y Costeras (IIMyC, UNMdP, CONICET) - Facultad de Ciencias, Exactas y Naturales, Mar del Plata, Argentina.
JESICA A. PAZ
Affiliation:
Instituto de Investigaciones Marinas y Costeras (IIMyC, UNMdP, CONICET) - Facultad de Ciencias, Exactas y Naturales, Mar del Plata, Argentina.
PABLO GARCÍA BORBOROGLU
Affiliation:
CONICET CENPAT Centro para el Estudio de Sistemas Marinos, Puerto Madryn, Chubut, Argentina. Global Penguin Society, Puerto Madryn, Argentina. CCT CENPAT- CESIMAR, Puerto Madryn, Chubut, Argentina.
MARICEL GRAÑA GRILLI
Affiliation:
INIBIOMA - Grupo de Investigaciones en Biología de la Conservación, Laboratorio Ecotono, Bariloche, Río Negro, Argentina.
MARCO FAVERO
Affiliation:
Instituto de Investigaciones Marinas y Costeras (IIMyC, UNMdP, CONICET) - Facultad de Ciencias, Exactas y Naturales, Mar del Plata, Argentina.
JUAN P. SECO PON
Affiliation:
Instituto de Investigaciones Marinas y Costeras (IIMyC, UNMdP, CONICET) - Facultad de Ciencias, Exactas y Naturales, Mar del Plata, Argentina.
*
*Author for correspondence; email: soficopello@hotmail.com
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Summary

The Olrog’s Gull Larus atlanticus is an endemic and threatened species of the south-western Atlantic. Little is known about its movements during the non-breeding period. The objective of this study was to analyse the migration of the species by tracking adults from Bahía San Blas (Buenos Aires province, Argentina) with geolocators and using information of sightings of ringed gulls. Differences between males and females were evaluated using tracking data and ringed data were used to determine age differences. A single core area (kernel 50%) from 21 tracked birds was identified. This area included the study colony and also other breeding colonies located up to 300 km to the north. The range area (kernel 95%) included coastal areas up to 1,000 km from the colony. All sightings of ringed gulls (n = 41) occurred north of the breeding colony, however 12 adult individuals were sighted during the winter in its breeding grounds. Our results suggest the occurrence of partial migration behavior in Olrog’s Gull. The migration pattern reported here implies than during the non-breeding season, breeding and wintering areas away from the nesting grounds should be considered as one system in the design of conservation strategies for this regionally threatened gull.

Keywords

Olrog’s GullLarus atlanticusnon-breeding distributionArgentina
Type
Research Article
Information
Bird Conservation International , Volume 30 , Issue 4 , December 2020 , pp. 661 - 670
Copyright
© Consejo Nacional de Investigaciones Científicas y Técnicas, 2020. Published by Cambridge University Press on behalf of BirdLife International.

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