It is important to understand the historical precedents of current situations to be able to anticipate where the current global environmental and climatic change may lead. Geo-historical data provide information beyond the limitations of instrumental data. This study aims to reconstruct components of the palaeoclimatic and palaeoenvironmental history of the Beagle Channel (BC) during the Late Holocene by using Ameghinomya antiqua shells. We use fossil and modern shells in a comparative analysis through a multiproxy approach, i.e., shell morphometrics, shell growth, and stable oxygen isotope ratios. A holistic analysis of all the proxies indicates that higher productivity occurred around 3542 yr B.P. in the BC, evidenced by more significant growth, size, and longevity in fossil specimens. In addition, smaller ligaments, cardinal teeth, and the pallial sinus in fossil specimens indicate a low-energy environment typical of a marine archipelago. Lastly, palaeotemperatures are estimated to be warmer than today, although the intensity may be overestimated due to the freshwater inflow that would change the salinity of the BC waters. Further analysis in Late-Holocene shells is essential for a more detailed environmental reconstruction around the southern tip of South America.

重要的是要了解当前情况的历史先例，以便能够预测当前全球环境和气候变化可能导致的走向。地理历史数据提供的信息超出了仪器数据的限制。本研究旨在利用Ameghinomya antiqua重建全新世晚期比格尔海峡 (BC) 古气候和古环境历史的组成部分。贝壳。我们通过多代理方法（即壳形态测量学、壳生长和稳定氧同位素比率）在比较分析中使用化石和现代壳。对所有代表的整体分析表明，公元前 3542 年左右发生了更高的生产力，这可以通过化石标本的更显着的生长、尺寸和寿命来证明。此外，化石标本中较小的韧带、主牙和大脑皮窦表明海洋群岛典型的低能量环境。最后，估计古温度比今天要高，尽管由于淡水流入会改变 BC 水域的盐度，强度可能被高估。对全新世晚期贝壳的进一步分析对于南美洲南端周围更详细的环境重建至关重要。