The late Quaternary evolution of central‐eastern Brazil has been under‐researched. Questions remain as to the origin of the Cerrado, a highly endangered biome, and other types of vegetation, such as the Capões – small vegetation islands of semi‐deciduous and mountain forests. We investigated the factors that influenced the expansion and contraction of the Cerrado and Capões during the late Quaternary (last ~35 ka), using a multi‐proxy approach: stable isotopes (δ¹³C, δ¹⁵N), geochemistry, pollen and multivariate statistics derived from a peat core (Pinheiro mire, Serra do Espinhaço Meridional). Five major shifts in precipitation, temperature, vegetation and landscape stability occurred at different timescales. Our study revealed that changes in the South Atlantic Convergence Zone (SACZ) seem to have been coeval with these shifts: from the Late Glacial Maximum to mid‐Holocene the SACZ remained near (~29.6 to ~16.5k cal a bp) and over (~16.5 to ~6.1 k cal a bp) the study area, providing humidity to the region. This challenges previous research which suggested that climate was drier for this time period. At present, the Capões are likely to be a remnant of a more humid climate; meanwhile, the Cerrado biome seems to have stablished in the late Holocene, after ~3.1 k cal a bp.

中文翻译：

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巴西中东部晚第四纪植被和气候动态：塞拉多生物群落中约35k bp bp泥炭记录的见解

对巴西中东部的第四纪晚期演化研究不足。塞拉多的起源，高度濒临灭绝的生物群落以及其他类型的植被（例如卡普埃斯岛）是一个问题，这些岛屿是半落叶和高山森林的小型植被岛。我们研究了影响晚第四纪扩张和塞拉多和Capões收缩（去年〜35万年），使用多代理方式的因素：稳定同位素（δ ¹³ C，δ ¹⁵N），地球化学，花粉和来自泥炭岩心的多变量统计数据（Pinheiro泥潭，Serra doEspinhaçoMeridional）。降水，温度，植被和景观稳定性的五个主要变化发生在不同的时间尺度上。我们的研究显示，在南大西洋辐合区（松奇）的改变似乎已经与同时代这些转变：从晚冰期到全新世中期的松奇仍接近（29.6〜来〜16.5k CAL一个BP）及以上（约16.5至〜6.1 k cal abp）研究区域，为该区域提供湿度。这对先前的研究提出了挑战，该研究表明这段时期的气候较干燥。目前，卡佩雷斯群岛可能是更潮湿的气候的残余。同时，塞拉多生物群系似乎在全新世晚期稳定下来，大约3.1 k cal abp。