Framed into a robust stratigraphic context, multivariate analyses on the Holocene palaeobiological record (pollen, benthic foraminifers, ostracods) of the Po coastal plain (NE Italy) allowed the investigation of microtidal ecosystems variability and driving parameters along a 35-km-long land–sea transect. Millennial-scale ecosystem shifts are documented by coeval changes in the meiofauna, reflecting variations in organic matter–water depth (shallow-marine environments) and degree of confinement-salinity (back-barrier settings). In-phase shifts of vegetation communities track unsteady water-table levels and river dynamics in freshwater palustrine areas. Five environmental–ecological stages followed one another crossing four tipping points that mark changes in relative sea level (RSL), climate and/or fluvial regime. At the culmination of Mediterranean RSL rise, after the 8200 event, remarkable growth of peatlands took place in the Po estuary, while low accumulation rates typified the shelf. At the transgressive–regressive turnaround (~7000 cal a bp), the estuary turned into a delta plain with tidally influenced interdistributary embayments. River flow regime oscillations after the Climate Optimum (post-5000 cal a bp) favoured isolation of the bays and the development of brackish wetlands surrounded by wooded peatlands. The youngest threshold (~800 cal a bp), which led to the establishment of the modern delta, reflects a major avulsion of the Po River.

中文翻译：

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全新世期间微潮生态系统千禧年规模的变化：波平原沿海记录（意大利东北部）变化的动力和驱动因素

在强大的地层背景下，对 Po 沿海平原（意大利东北部）全新世古生物学记录（花粉、底栖有孔虫、介形动物）的多变量分析允许调查沿 35 公里长的陆地的微潮生态系统变异性和驱动参数——海横断面。千年尺度的生态系统变化由小型动物群的同期变化记录，反映了有机物-水深（浅海环境）和限制盐度（背障设置）的变化。植被群落的同相位移跟踪淡水沼泽地区不稳定的地下水位和河流动态。五个环境生态阶段依次跨越四个临界点，这些临界点标志着相对海平面 (RSL)、气候和/或河流状况的变化。在地中海 RSL 上升的顶点，在 8200 事件之后，Po 河口泥炭地显着增长，而低积累率是陆架的典型特征。在海侵-回归转向（~7000 cal abp），河口变成三角洲平原，受潮汐影响的支流间海湾。气候优化之后的河流流态振荡（5000 cal a bp 之后）有利于海湾的隔离和被树木繁茂的泥炭地包围的微咸湿地的发展。导致现代三角洲建立的最年轻的阈值 (~800 cal a bp ) 反映了波河的一次重大撕裂。