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• W2184926907 abstract "We analyzed stock and recruitment data of Pacific sar- dine (Sardinops sagax) from the Gulf of California, Mexico. We used the Shepherd and Ricker stock-recruitment (S-R) models and included a new parameter in the S-R function. The new parameter, associated with the Allee effect, was defined as � , which permitted a non-zero in- tercept representing recruitment failure. The general model was R t = (S t - � )F(S t - � ,� ), where R t is re- cruitment, S t is spawning stock, andrepresents the parameters in the model. Parameters were estimated using a negative log-likelihood algorithm. Thepara- meter was estimated to be 287 x 10 6 spawning adults in the Shepherd model and 1,569 x 106 spawning adults in the Ricker model, with these values representing the abundance of the adult stock with zero recruitment. We proposed usingas a reference point in the fishery. Estimates ofdid not indicate an Allee effect in the sar- dine population in the Gulf of California, because when the parameters in this model were estimated, we ob- served that estimates of recruitment were not less than the reference value of 287 million individuals. We be- lieve the fall of abundance during 1993 and 1994 is pos- sibly associated with environmental factors. In these years, the Pacific sardine was far from the reference point es- timated by our study, and we believe that thepara- meter is a good indicator of the minimum stock size necessary to maintain the fishery." @default.
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• W2184926907 date "2005-01-01" @default.
• W2184926907 modified "2023-09-27" @default.
• W2184926907 title "SPAWNER-RECRUIT PATTERNS AND INVESTIGATION OF ALLEE EFFECT IN PACIFIC SARDINE (SARDINOPS SAGAX) IN THE GULF OF CALIFORNIA, MEXICO" @default.
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