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Newly discovered breeding sites of Olrog's Gull Larus atlanticus in Argentina

Published online by Cambridge University Press:  11 May 2010

Pablo Yorio ,
Gabriel Punta ,
Daniel Rabano ,
Fabian Rabuffetti ,
Gonzalo Herrera ,
Jose Saravia  and
Pablo Friedrich
Pablo Yorio
Affiliation:
Fundación Patagonia Natural and Wildlife Conservation Society, M. Zar 760, 9120, Puerto Madryn, Chubut, Argentina.
Gabriel Punta
Affiliation:
Dirección General de Intereses Marítimos y Pesca Continental and Universidad Nacional de la Patagonia San Juan Bosco, 9 de Julio y J.A. Roca, 9103, Raioson, Chubut, Argentina.
Daniel Rabano
Affiliation:
Universidad Nacional del Sur, Perú 670, 8000, Bahia Blanca, Buenos Aires, Argentina.
Fabian Rabuffetti
Affiliation:
Universidad Nacional del Sur, Perú 670, 8000, Bahia Blanca, Buenos Aires, Argentina.
Gonzalo Herrera
Affiliation:
Universidad Nacional de la Patagonia San Juan Bosco, Belgrano 504, 9100 Trelew, chubut, Argentina.
Jose Saravia
Affiliation:
Dirección General de Intereses Marítimos y Pesca Continental and Universidad Nacional de la Patagonia San Juan Bosco, 9 de Julio y J.A. Roca, 9103, Raioson, Chubut, Argentina.
Pablo Friedrich
Affiliation:
Universidad Nacional del Sur, Perú 670, 8000, Bahia Blanca, Buenos Aires, Argentina.
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Summary

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Olrog's Gull Larus atlanticus is a threatened and endemic species to the Argentine Atlantic coast. We present information on seven new colonies and update information on known colonies obtained during 1992–1995. Five of the new colonies were in southern Buenos Aires and two in southern Chubut. Total population size, including already known colonies, was estimated at 2,300 breeding pairs. All colonies were located on islands and islets and were associated with breeding Kelp Gulls Larus dominicanus. The new colonies extend the known breeding range of Olrog's Gull to the north and increase the overall known population size. However, the aerial survey also showed that two colonies found in 1990 no longer exist. Almost 40% of the total breeding population breed within the Bahía Blanca estuary, an area currently subject to intense human pressure. Olrog's Gull is still a species with restricted distribution and low population size. We suggest conservation actions needed to adequately protect this threatened species.

Type
Research Article
Information
Bird Conservation International , Volume 7 , Issue 2 , June 1997 , pp. 161 - 165
Copyright
Copyright © Birdlife International 1997

References

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