Profound changes to the species configuration of ecosystems globally during the 19th to 21st centuries, resulting from the introduction of neobiota, have produced a distinctive palaeontological signature in sedimentary deposits, here exemplified by those of the River Thames. Coring near Teddington Lock (ca. 4.3 m above sea level, ca. 89 km upstream from the mouth of the Thames estuary) yielded dense assemblages of shells of the invasive Asian clam Corbicula fluminea (recently invaded in 2004) and the zebra mussel Dreissena polymorpha (invaded 1824), which together accounted for 96% of individuals sampled. Population densities of C. fluminea of over 6000 individuals per m² were maintained for a depth of 1 m indicating that the Asian clam is an important biostratigraphical marker in the Thames for sedimentary deposits accumulating since 2004. The first modern European occurrence of C. fluminea was in Portugal in 1980. In 1987, the first occurrence of C. fluminea on the northern coast of South America was observed in the Caripe River, Venezuela. The non‐native range of D. polymorpha was restricted to continental Europe for over 200 years until it appeared in the Great Lakes, USA, in 1986 having been transported in ballast water. Within three years, it reached populations of over 750,000 individuals per m² and it is presently recorded in 35 states. Therefore, the pan‐Atlantic range expansion of D. polymorpha, coupled with the recent invasion history of C. fluminea in Venezuela and Portugal, identifies a biostratigraphical interval in sedimentary deposits forming from the early 1980s that can be correlated between Europe and the Americas.

中文翻译：

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泰晤士河上的侵入性软体动物群体现了人类世的生物地层特征

由于引入了新生物群，在19至21世纪全球生态系统物种结构发生了深刻变化，在沉积物中产生了独特的古生物学特征，此处以泰晤士河为例。在Teddington Lock（海拔约4.3 m，距泰晤士河口上游约89 km处）附近取芯，产生侵入性亚洲蛤Cor（Corbicula fluminea）（最近于2004年入侵）和斑马贻贝Dreissena polymorpha的壳密集的组合（入侵1824年），总共占样本总数的96％。每m ²超过6000个个体的流感梭菌的人口密度自从2004年以来，亚洲蛤一直保持在1 m的深度，这表明泰晤士河上亚洲蛤是重要的生物地层标志物。在1980年，葡萄牙首次出现了欧洲的C.fluminea。1987年，在委内瑞拉的Caripe河中观察到了南美北部海岸地区的C. fluminea。的非本地范围D.多形仅限于欧洲大陆的超过200年，直到它出现在大湖地区，美国，1986年在压载水，被运送回国。在三年内，它达到了每m ²超过75万个人的人口，目前在35个州中有记录。因此，泛大西洋范围的扩大D. polymorpha，再加上委内瑞拉和葡萄牙的C. fluminea近期入侵史，确定了1980年代初形成的沉积矿床中的生物地层间隔，这可能与欧洲和美洲之间相关。