The Jack mackerel Trachurus murphyiand the environmental macro-scale variables

Revista Peruana de Biología

Marco Espino¹ 

[1] Instituto del Mar del Perú (IMARPE);

关键词: Jurel;    variabilidad ambiental;    PDO;    SOI;    distancia euclidiana;    recursos pelágicos;    pesquería peruana;   

DOI  :  10.15381/rpb.v20i1.2614

来源: DOAJ

【 摘 要 】

This paper analyses information on various macro environmental variables available since1876 for the Southeast Pacific and more recent data on Jack mackerel Trachurus murphyi(Nichols, 1920) landings and biomass in the Peruvian sea, relating them to probable areasof water masses equivalent to Cold Coastal Waters (CCW) and Subtropical Surface Waters(SSW). It is concluded that the index of the Pacific Decadal Oscillation (PDO) presentsexpressions of variability that are consistent with those found for the Southern OscillationIndex (SOI) and that the detected changes in biomass of Jack mackerel T. murphyiin thePeruvian sea reflect changes in the availability of the fish stock associated with secular(SOI) and decadal (PDO) variability patterns. These fluctuations in stock availability impactfisheries in Ecuador, Peru and northern Chile, which show significant variations in theirlandingsandwouldhavegivenabiasedpictureofthestateofabundance,leadingtowrong diagnoses of the real situation of the exploited stocks. These patterns of variabilitywould also affect the appearance of El Niño, making them start in the southern hemisphereautumn or spring depending on whether the current PDO is positive or negative. Periods ofhigh (1876 – 1925 and 1976 – 2012) and low (1926 – 1975) variability are also identified inrelation to the Euclidean distance of the variances of the SOI; and in relation to the PDO adistinction is made between warm (1925 – 1944 and 1975 – 1994), cold (1945 – 1974) andtempered or interface periods (1895 – 1924 and 1995 – 2012), the latter being explainedby the interaction between periods of high variability.

【 授权许可】

Unknown