The global climate during the latest Cretaceous became variable, with several global warming and cooling trends in a context of a greenhouse Earth. The responses of marine ecosystems to these climate events are relatively well known worldwide; however, lacustrine responses are poorly known due to the less frequent and discontinuous terrestrial fossil records. The relative changes in charophyte diversity in continuous lacustrine sedimentary sequences from two basins in East Asia, i.e., Songliao and Jiaolai, are considered here for the first time to establish their correlation with global climate changes during the Late Cretaceous and K/Pg boundary, compared with the well-studied south European Ibero-Armorican Island. Lacustrine deposits correlated with the Campanian–Maastrichtian Boundary Event (CMBE), related to a long cooling period provided a relatively low diversity in East Asia. In contrast, we detected a diverse charophyte flora in lacustrine deposits correlated with the Mid-Maastrichtian Event (MME) in East Asia in a global warming trend. A higher charophyte diversity was further found in the end-Cretaceous global warming event due to speciation under the background of latest Maastrichtian warming event (LMWE). During the LMWE, Characeae species such as Microchara cristata reduced its size significantly due to environmental stress probably related to the Deccan volcanism. On the other hand, a general tendency of increasing the gyrogonite size in new Characeae taxa has been detected in populations extracted from lower Danian deposits, probably related to stable palaeoenvironmental conditions in a global cooling context. This study represents the first attempt to correlate the response of the charophyte flora to global climate changes in permanent lacustrine systems during the three main Late Cretaceous–early Danian climatic turnovers.

在最近的白垩纪期间，全球气候变化不定，在温室地球的背景下，全球气候出现了一些变暖和变冷的趋势。海洋生态系统对这些气候事件的反应在世界范围内相对众所周知。但是，由于陆生化石记录的频率较低且不连续，因此人们对湖相的反应知之甚少。本文首次考虑了东亚两个盆地松辽和胶莱的连续湖相沉积序列中的藻类多样性相对变化，以比较它们与白垩纪晚期和K / Pg边界期间全球气候变化的相关性。以及经过精心研究的南欧伊比利亚-阿莫里肯岛。Lacustrine沉积物与Campanian–Maastrichtian边界事件（CMBE）相关，与长期冷却相关的东亚地区多样性相对较低。相比之下，在全球变暖趋势下，我们在湖沉积物中发现了与东亚中马斯特里赫特事件（MME）相关的多样化的浮游植物。在最近的马斯特里赫特变暖事件（LMWE）的背景下，由于物种形成，白垩纪末的全球变暖事件中进一步发现了更高的风化细菌多样性。在LMWE期间，Char科物种如由于可能与Deccan火山活动有关的环境压力，Microchara cristata的大小显着减小。另一方面，在从较低的达尼安河沉积物中提取的种群中，发现了新的木犀科分类群中陀螺石大小的总体趋势，这可能与全球冷却环境下的古环境稳定有关。这项研究代表了在三个主要的白垩纪至早期达尼安气候周转过程中，永久性湖相系统中风生植物菌群对全球气候变化的响应的首次尝试。