A regular pattern of periodicity in the monthly catch of jumbo squid (Dosidicus gigas) along the Chilean coast (2002–2005)
Artículo
![Thumbnail](/themes/Mirage2/images/cubierta.jpg)
Open/ Download
Publication date
2008Metadata
Show full item record
Cómo citar
Zúñiga, M. J.
Cómo citar
A regular pattern of periodicity in the monthly catch of jumbo squid (Dosidicus gigas) along the Chilean coast (2002–2005)
Author
Abstract
A regular seasonal pattern of periodicity was detected in monthly catch data for Dosidicus gigas during the most recent
period of high abundance of the species off Chile. Monthly catch data covering from 2002 to 2005 were grouped into three large
zones, and the trend of the time series was removed by using loess smoother. The residuals between the original and the loess
trend curve were computed and analyzed using autocorrelation and cross-correlation at different lags, and a trigonometric model
was fitted to detect seasonal oscillation. A coherent pattern in the short-term monthly residuals was observed in the three time
series, revealing a similar underlying process in the catch data, with a six-month cycle. We postulate that the seasonal and
interannual fluctuations observed in the catch records could be related to the reproductive success of the species through the
average occurrence of two reproductive cycles per year, and hence the generation of two cohorts per year.
Quote Item
Ciencias Marinas, 34(1): 91–99
Collections