Planktonic Foraminifera are widely used in paleoceanographic reconstructions, although studies of their trophic interactions are still rare, especially those focusing on predation. Drilling holes are the most frequent traces of bioerosion in foraminifer tests, but environmental factors that control bioerosion are not yet understood. To determine if paleoceanographic variables are associated with bioerosion rates in late Quaternary planktonic foraminifers of the western South Atlantic, geochemical and assemblage analyses were made on a 46 kyr record from a piston core. An age model was constructed based on 10 AMS ¹⁴C dates. To reconstruct the paleoproductivity, δ¹³C, benthic/planktonic foraminifer and the relative abundances of Globigerina bulloides and Globigerinoides ruber (high and low productivity, respectively) were used. Bioeroded tests were counted and found in 21 of the 25 identified species, with frequencies ranging from 8.84% to 16.7%. Bioerosion was different in two groups identified by cluster analysis, with a higher intensity during glacial times, showing a strong correlation with paleoceanographic fluctuations. Paleoproductivity estimates and bioerosion rates show a significant correlation, suggesting that bioerosion is more frequent in eutrophic environments and more inhibited in oligotrophic conditions. However, even with a strong correlation between bioerosion and productivity, there is also a negative correlation with sea surface temperature in the study area. Since conditions that promote higher productivity are accompanied by a decrease in surface temperature, the precise distinction between the influence of both variables is hampered. Further research will allow us to explore the potential of planktonic foraminiferal bioerosion as a tool in paleoceanographic studies.

中文翻译：

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与南大西洋西部古生产力有关的第四纪晚期浮游有孔虫的生物侵蚀

尽管对浮游有孔虫的营养相互作用的研究仍然很少，尤其是针对掠食性的研究，但浮游有孔虫已广泛用于古海洋重建。钻孔是有孔虫测试中最常见的生物侵蚀痕迹，但控制生物侵蚀的环境因素尚未被了解。为了确定古海洋学变量是否与南大西洋西部晚期第四纪浮游有孔虫的生物侵蚀率相关，对来自活塞芯的46年记录进行了地球化学和组合分析。建立了基于10个AMS ¹⁴ C日期的年龄模型。为了重建古生产力，δ ¹³ C，底栖/浮游有孔虫和的相对丰度抱球虫bulloides和球果橡胶（分别为高生产率和低生产率）。对25种已鉴定物种中的21种进行了生物侵蚀测试的计数，发现频率为8.84％至16.7％。通过聚类分析确定的两组中的生物侵蚀不同，在冰川时期强度更高，显示出与古海洋学起伏强烈相关。古生产力估计值和生物侵蚀率显示出显着的相关性，这表明在富营养化环境中生物侵蚀更加频繁，在贫营养条件下生物腐蚀受到更多的抑制。但是，即使生物侵蚀与生产力之间具有很强的相关性，研究区域中的海面温度也存在负相关性。由于提高生产率的条件伴随着表面温度的降低，这两个变量的影响之间无法精确区分。进一步的研究将使我们能够探索浮游有孔虫生物侵蚀作为古海洋学研究工具的潜力。