Apr 24, 2020

Greenhouse conditions in Lower Eocene coastal wetlands? - Lessons from Schöningen, Northern Germany

BioRxiv : the Preprint Server for Biology
Olaf K. LenzV. Wilde

Abstract

The Paleogene succession of the Helmstedt Lignite Mining District in Northern Germany includes coastal peat mire records from the latest Paleocene to the middle Eocene at the southern edge of the Proto-North Sea. Therefore, it covers the different long- and short-term climate pertubations of the Paleogene greenhouse. 56 samples from three individual sections of a Lower Eocene seam in the record capture the typical succession of the vegetation in a coastal wetland during a period that was not affected by climate perturbation. This allows to distinguish facies-dependent vegetational changes from those that were climate induced. Cluster analyses and NMDS of well-preserved palynomorph assemblages reveal four successional stages in the vegetation during peat accumulation: (1) a near-coastal vegetation, (2) a lowland mire, (3) a transitional mire, and (4) a terminal mire. Biodiversity measures show that plant diversity decreased significantly in the successive stages. The highly diverse vegetation at the coast and in the adjacent lowland mire was replaced by low diversity communities adapted to wet acidic environments and nutrient deficiency. The palynomorph assemblages are dominated by elements such as Alnus or Sphagnum. Typical tro...Continue Reading

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