A palynological record from Girraween Lagoon sediments (Darwin region of the Northern Territory, Australia) provides detailed long-term insight into tropical savanna vegetation community patterns, climatic and fire relationships, through Marine Isotope Stage 4 (MIS 4: 71–57 thousand years ago, ka) and Marine Isotope Stage 3 (MIS 3: 57–29 ka). Owing to a lack of data in reconstructing northern Australian environments, this paper looks to define and describe to a greater degree the nature and scope of these stadial and interstadial stages for the region. Girraween Lagoon simultaneously provides proximal palaeoecological data for the time and region of Aboriginal people's first arrival into Australia, also encompassing the late Pleistocene continental decline of megafauna. This study provides a dataset enabling full exploration of long-term people-landscape and faunal-floral interactions. Sea levels and associated variations imposed on the transportation of moisture and heat, held implications for MIS 4 and MIS 3 monsoon strength, which was particularly consequential for Girraween regional ecology. Results reveal a prolonged transition from wooded- to grassy-savanna, into a cool drier semi-arid savanna. Increasingly episodic delivery of moisture influenced the permanency of freshwater in the landscape.

中文翻译：

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基于对澳大利亚达尔文吉拉温泻湖沉积物的孢粉学分析，MIS 4 和 MIS 3 阶段和跨阶段的植被变化

吉拉温泻湖沉积物（澳大利亚北领地达尔文地区）的孢粉学记录通过海洋同位素第 4 阶段（MIS 4：71-57000 年前）提供了对热带稀树草原植被群落模式、气候和火灾关系的详细长期见解, ka) 和海洋同位素阶段 3 (MIS 3: 57–29 ka)。由于缺乏重建澳大利亚北部环境的数据，本文试图在更大程度上定义和描述该地区这些体育场和体育场间阶段的性质和范围。吉拉温泻湖同时提供了原住民首次抵达澳大利亚的时间和地区的近端古生态数据，还包括更新世晚期巨型动物群的大陆衰落。这项研究提供了一个数据集，可以全面探索长期的人地景观和动物植物相互作用。海平面和对水分和热量输送造成的相关变化对 MIS 4 和 MIS 3 季风强度产生影响，这对吉拉文区域生态尤其重要。结果显示，从树木繁茂的稀树草原到草本稀树草原，再到凉爽干燥的半干旱稀树草原的转变过程很长。越来越多的间歇性水分输送影响了景观中淡水的持久性。