在解释热带金枪鱼产生随附行为的原因中，"流木指示物"假说认为流木往往会滞留在锋面等高生产力水域附近，但目前尚未得到证实。为了检验锋面对流木随附群的影响，本研究使用中西太平洋1993-1997年间的海洋表层温度(Sea Surface Temperature，SST)、海洋表层盐度(Sea Surface Salinity，SSS)数据和中西部太平洋渔业委员会(Western and Central Pacific Fisheries Commission，WCPFC)的金枪鱼围网捕捞数据，使用绝对梯度指标定量表征海洋温度锋、盐度锋的强弱，分析流木随附群和自由鱼群在不同温度、盐度梯度范围的分布差异。研究结果表明，海洋温度锋对流木随附群具有更强的聚集作用，而自由鱼群倾向于聚集在盐度锋附近。本研究结果为更好地理解"流木指示物"假说及热带金枪鱼随附行为的发生机制提供了实践经验。
Study on the Aggregation Effect of Ocean Fronts on Tropical Tuna Log-associated Schools
In explaining the associative behavior of tropical tunas,the"log-indicator"hypothesis suggests that logs tends to stay near productive waters such as ocean fronts,but it has not yet been proven.In order to examine the influence of ocean front on log-associated schools,this study used the sea surface temperature(SST)and sea surface salinity(SSS)data of the Western and Central Pacific Ocean from 1993 to 1997,and Western and Central Pacific Fisheries Commission(WCPFC)tuna Seine catch data,the absolute gradient index was used to quantitatively characterize the strength of ocean temperature front and salinity front,and to analyze the distribution difference of log-associated schools and free-swimming schools in different temperature and salinity gradient ranges.The results show that the ocean temperature front has a stronger aggregation effect on the log-associated schools,while the free-swimming schools tend to gather near the salinity front.The results of this study can provide practical experience for better understanding of the"log-indicator"hypothesis and the mechanism of associative behavior in tropical tunas.
western and central pacific oceantropical tunas"log-indicator"hypothesisocean frontassociative behavior
万方数据
维普
