Demographic consequences of within-year variation in recruitment

摘要: I explored the consequences of variance in timing recruitment to early growth and survivorship a guild sculpins that occupy intertidal areas on outer coast Washington state (USA). When quantified appearance new recruits every month for 3 yr. found seasonal peaks most common species this system, although fishes recruited throughout sprlng summer months. Mark-recapture studies revealed espec~ally strong patterns 2 species, with increased rates durlng This effect was pronounced young-of-the-year fishes. As consequence, lndiv~duals all specles reach reproductive size more rapidly benrfit from higher surv~vorship when they recruit earlier spring summer. These demographic wi th~n-year ecruitment vandtion appear driven by large-scale oceanographic events, since can be correlated upwelling andlor sea surface temperature. Although these results suggest within-season variation, via its juvenile performdnce, may affect population trajectories nearshore fishes, previous research system also ~ndica tes role adult patterns. Thus, understanding net pelagic events drivlng dynamics organisms complex life cycles requires integration both b e n t h ~ c hfe history events.