Temperature and food-mediated variability of European Atlantic sardine recruitment
Temperature and food-mediated variability of European Atlantic sardine recruitment
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DOI：
10.1016/j.pocean.2017.10.006
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发表时间：
2017-12-01
影响因子：
4.1
通讯作者：
Santos, A. Miguel P.
中科院分区：
文献类型：
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作者：
Garrido, Susana;Silva, Alexandra;Santos, A. Miguel P.
在伊比利亚沃茨的欧洲沙丁鱼（沙丁鱼pilchardus）在幼虫发育过程中的环境条件的影响所产生的招聘强度进行了调查。卫星派生的海表温度（SST）和叶绿素a浓度（Chla）数据从以前的产卵季节（1月至3月/4月和10月至12月的前一年）与招聘成功的数据在主要的招聘热点。招募数据来自每年的声学科学巡航和国际海洋考察理事会招募指数估计的年龄结构模型的整个股票。一个线性判别分析模型，使用SST，叶绿素a，和丰富的产卵季节的产卵识别年的高和低招聘的所有招聘热点的准确性>= 79%。在一般情况下，高招募年与高叶绿素a和低SST，虽然最重要的变量来区分群体的区域特定的。高招募年份主要与高粮食供应（Chla）有关，特别是在前一年的最后一个季度。在西伊比利亚和加迪斯湾，高招聘年也与较低的SST，而在比斯开湾，在那里的SST在冬季一般低于最佳范围约11-12摄氏度的沙丁鱼幼虫发育，较高的招聘与高SST。对于ICES数据的南欧沙丁鱼股票，较低的SST和较高的Chla在去年的最后一个季度与高招聘年和SST单独能够区分两个招聘组与73%的准确性。虽然现有数据的时间序列仍然很小，但这些重要的关系与将幼虫生长和死亡率与主要环境驱动因素联系起来的实地和实验室研究是一致的。今后几年应进一步调查这些关系，以评价是否可利用这些关系建立可靠的指标，预测补充量和丰度，并提前充分帮助管理这一重要的渔业资源。
The influence of the environmental conditions during larval development on the resulting recruitment strength was investigated for European sardine (Sardina pilchardus) at Atlanto-Iberian waters. Satellite-derived Sea Surface Temperature (SST) and Chlorophyll-a concentration (Chla) data from the previous spawning seasons (January to March/April and October to December of the previous year) were related to recruitment success data in the main recruitment hotspots. Recruitment data was taken from yearly acoustic scientific cruises and from the ICES recruitment index estimated by an age-structured model for the entire stock. A linear discriminant analysis model using SST, Chla, and the abundance of spawners during the spawning season identified years of high and low recruitment for all the recruitment hotspots with an accuracy of >= 79%. In general, high recruitment years were associated with high Chla and low SST, although the most important variables to discriminate between the groups were area-specific. High recruitment years were mostly related to high food availability (Chla), particularly during the last quarter of the previous year. In Western Iberia and in the Gulf of Cadiz, high recruitment years were also associated to lower SST, whereas in the Bay of Biscay, where SST during the winter was generally below the optimal range approximate to 11-12 degrees C for sardine larval development, higher recruitment was associated with high SST. For ICES data of the southern European sardine stock, lower SST and higher Chla during the last quarter of the previous year were associated with high recruitment years and SST alone was able to discriminate between the two recruitment groups with 73% accuracy. Although the time-series of available data are still small, these significant relationships are consistent with field and laboratory studies relating larval growth and mortality with main environmental drivers. These relationships should be further investigated in the following years to evaluate if they can be used to construct reliable indicators to predict the level of recruitment and abundance with sufficient advance to help in the management of this important fishing resource.