Aggression levels of the Western Sandpiper Calidris mauri in a freshwater environment in Baja California peninsula, México

Full article

Published:

Volume 52(2), December 2005. Pages 365-369.

Language:

Spanish

Original title:

Niveles de agresión del Correlimos de Alaska Calidris mauri en un ambiente dulceacuícola de la Península de Baja California, México

Abstract:

We determine the relationship among the tide level (that affects positively the birds density) and the aggression levels of the Western Sandpipers Calidris mauri, in an artificial freshwater environment nearby to the beach, in the south of the Baja California, Peninsula, México (2002). We register 0.93 aggressions per minute (82% intraspecifics). We observe that in low tide levels more than 60% of the records did not imply aggressions. Upon raising the tide the percentage reduced, in the highest level almost reached 10%. The increase in the numbers of Western Sandpiper provoked a decrease in the individual distance, what was reflected in greater competitions and aggression levels.