In the absence of instrumental records, shell growth increments of bivalves are used to build continuous multi-decadal time series of growth and to estimate environmental variability. While there is interest in such chronologies in the Northern Hemisphere, there is a lack of multi-decadal datasets of growth for marine species from the Southern Hemisphere. We assessed the potential of the clam Glycymeris longior as an environmental proxy archive for the mid-latitudes of the South Atlantic Ocean, by applying sclerochronological techniques on the shells of individuals from a coastal area in Northern Patagonia, Argentina. Growth of G. longior showed a synchronous pattern, and shells were cross dated. We demonstrated that G. longior shells can be used to generate a robust multi-decadal chronology. The chronology spanned for a period of 22 years, from 1990 to 2011. This chronology has the potential to be extended, given that the maximum longevity of the analysed shells was 69 years. Significant positive correlations were found between the chronology and sea surface temperature and the Southern Annular Mode index. The sclerochronological approach performed in this study is a first step toward a long-term understanding of the links between climate and growth patterns of bivalves in temperate regions of SW Atlantic Ocean, under a long-term perspective.

中文翻译：

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长期甘草（Ballyvia，Mollusca）作为阿根廷海（南半球）多年代年代记录档案的潜力。

在没有仪器记录的情况下，使用双壳类动物的壳生长增量来建立连续的多年代时间序列增长并估计环境变异性。尽管对北半球的这种年代学很感兴趣，但缺乏南半球海洋物种生长的年代际数据集。我们通过在阿根廷北巴塔哥尼亚北部沿海地区的个体壳上应用年代学技术，评估了长蛤蛤作为南大西洋中纬度地区环境代理档案的潜力。G. longior的生长显示出同步的模式，并且壳已过时。我们证明了G. longior壳可以用于生成健壮的多年代年代学。时间跨度为22年，从1990年到2011年。考虑到所分析的炮弹的最长寿命为69年，这种年表有可能被扩展。在年代学和海面温度与南部环形模式指数之间发现了显着的正相关。从长期的角度来看，这项研究中采用的年代学方法是朝着长期了解西南大西洋温带地区双壳类的气候与生长方式之间的联系迈出的第一步。