[OANNES Foro] Synchronous patterns of fluctuations in two stocks of anchovy in the Humboldt Current System

[Mario Cabrejos]

Journal of Applied Ichthyology

Article first published online: 2 DEC 2014

DOI: 10.1111/jai.12646


 


 


Synchronous patterns of fluctuations in two stocks of anchovy Engraulis
ringens Jenyns, 1842 in the Humboldt Current System


1.     S. M. Cahuin1,2,*, L. A. Cubillos1,2 and R. Escribano3

1 Programa COPAS Sur-Austral y Departamento de Oceanografía, Facultad de
Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción,
Chile

2 Laboratorio de Evaluación de Poblaciones Marinas (EPOMAR), Departamento de
Oceanografía, Facultad de Ciencias Naturales y Oceanográficas, Universidad
de Concepción, Concepción, Chile 3Departamento de Oceanografía, Facultad de
Ciencias Naturales y Oceanográficas, Instituto Milenio de Oceanografía
(IMO), Universidad de Concepción, Concepción, Chile. * Author's address:
Sandra Cahuin E-mail:  <mailto:scahuin en udec.cl> scahuin en udec.cl

2.      

 


Summary


Most of the studies investigating synchrony in fluctuations of abundance of
small pelagic fish have been based on catch data only, which do not describe
the dynamics of populations as a relative abundance index. In this paper,
catch, biomass, recruitment and recruitment rate, were used to compare
synchronous changes for two stocks of anchovy (Engraulis ringens) from 1982
to 2004. One is the North Central Peru stock (NCP) and the other is the
shared South Peru-Northern Chile stock (SPNC). Correlation analysis
demonstrated a significant association between population time series,
particularly during the growing phase of the stocks. Thus, the synchronous
fluctuation pattern of the two stocks is due to the recovery phase and
probably driven by density-independent effects of simultaneous favorable
environmental conditions occurring in the two regions. The conclusions were:
(i) both NCP and SPNC anchovy stocks are in an overall positive phase of
synchrony, (ii) higher correlations in the synchronous pattern of
fluctuations occurred during simultaneous increase of biomass, and (iii)
short-term fluctuations were negative when the abundance of the stock was
lower and/or impacted by El Niño events.

 



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