Abstract
Monthly volumes of capture of Lutjanus peru and Lutjanus guttatus from the coast of Guerrero, Mexico, were analyzed considering eight annual cycles. Time-series, auto correlation, and cross-correlation analysis showed that monthly abundance of populations display unsystematic variations. The FiSAT software was used to obtain the recruitment patterns of both species, using length-frequency data. Our results support the hypothesis that temporal phase-shifts in reproductive events, hence recruitment, explain the coexistence of these species. The outcome of this mechanism is a temporal succession of specific recruit abundance off the coasts of Guerrero, Mexico. The uncoupling of the recruitment events between these species, induces a separation of recruits: therefore, the intake of a particular set of preys could take place at different times.
Highlights
El grupo de los lutjánidos está compuesto, en términos generales, por especies que se alimentan de un espectro relativamente amplio de presas y que, cuando están presentes en el mismo hábitat, compiten por los mismos recursos tróficos presentando niveles de traslape dietéticos relativamente altos (Haight et al 1993, Guevara et al 1994, Sámora-Zapata y VegaCendejas 1998, Sierra 1997, Vega-Cendejas 1998, Franks y VanderKooy 2000)
Time-series, auto correlation, and cross-correlation analysis showed that monthly abundance of populations display unsystematic variations
Our results support the hypothesis that temporal phase-shifts in reproductive events, recruitment, explain the coexistence of these species
Summary
El grupo de los lutjánidos está compuesto, en términos generales, por especies que se alimentan de un espectro relativamente amplio de presas y que, cuando están presentes en el mismo hábitat, compiten por los mismos recursos tróficos presentando niveles de traslape dietéticos relativamente altos (Haight et al 1993, Guevara et al 1994, Sámora-Zapata y VegaCendejas 1998, Sierra 1997, Vega-Cendejas 1998, Franks y VanderKooy 2000). En el presente estudio postulamos que la coexistencia de L. peru y L. guttatus puede estar mediada por las variaciones temporales en el reclutamiento reflejadas en términos de una sucesión temporal de la abundancia de los reclutas de cada especie.
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