Resumen del producto

The blue whale vocalizations have been related to migration patterns, foraging and reproductive behaviors for determined areas of the Northeast Pacific. Here we present a comparative and connection analysis of acoustic recording data between a feeding and a breeding grounds.  Diel patterns, and regional connectivity of the vocalization patterns of blue whales during winter from the GC and compare with the California summer feeding area. We analyzed long-term acoustic data from the Southern (2005-2007) and the Northern Region (2007-2010) of the GC, covering six years of recording. The spectrograms were processed using the software "Triton" of MATLAB, where 15,539 blue whale calls were detected, of which 2,723 (18%) were vocalization type A, 11,249 were vocalization type B (72%), and 1,567 were vocalization type D (10%). Vocalizations A and B were produced both as song units (2,524) or AB singular calls (2,026). The vocalization rates (number of vocalizations/day) showed a diel pattern, with similarities with results off California, with the highest rates during twilight and dawn, however, there were no differences between night and day as has been reported off California, suggesting that even though the whales in the GC continue to forage, the intensity is lower. The seasonal patterns found in the GC and those found in a previous study for California, showed a clear temporal continuity, with song and AB singular calls dominance during early winter, while vocalization type D increasing as the season progressed, becoming dominant during spring in the GC. These were also registered in California in spring continuing during summer, and shifting to songs and AB singular calls in summer and autumn. These findings corroborates the movement of whales between both regions and complements the vocal scenario of the Northeastern population.

Palabras clave: Blue whale; acoustic; Gulf of California

Para obtener una copia del documento contacta la personal de la biblioteca a través del correo bibliocicimar{a}ipn.mx