Examination a hypothesis "growth rate-dependent recruitment" using an archives of sardine otolith

基于耳石生长增量宽度作为与新成员丰度和环境因素相关的每日体细胞生长速率的代理，研究了1980-2000年间太平洋沙丁鱼（Sardinops sagax）早期生命阶段的生长速率。幼鱼早期（孵化后60 ~ 90天）的生长率与幼鱼的丰度和夏季海面温度呈正相关。对日本沙丁鱼（S. melanotictus）的研究表明，幼鱼早期的生长率是其招募丰度的正函数，即生长率依赖的招募假说。本研究的结果表明，同样的假设也适用于沙蒿，并表明在20世纪90年代，早期幼期温度的升高促进了沙蒿的生长和存活率，从而增加了沙蒿的招募。

Growth rate during the early life stages of Pacific sardine Sardinops sagax during 1980-2000s was examined based on widths of otolith growth increments as a proxy of daily somatic growth rate in relation to abundance of recruits and environmental factors. Growth rate during the early juvenile stage(60-90 days after hatching) positively correlated with abundance of recruits and sea surface temperature in summer. Previous studies on Japanese sardine S. melanostictus have demonstrated that abundance of recruits is a positive function of growth rate during the early juvenile stage, which is the growth rate-dependent recruitment hypothesis. The results in this study show that the same hypothesis could be applicable for S. sagax and suggest that increase in temperature during the early juvenile stage enhanced growth and survival rates and consequently increased recruitment of S. sagax in the 1990s.