Invasive Species Compendium

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Abstract

Alinlampi, a Late-Glacial site in the northern Karelian Republic.

Abstract

A re-investigation of Alinlampi - known previously to have a complete stratigraphic succession from Younger Dryas (>10 640 B.P.) to mid-Holocene ("Atlantic") - was made using pollen, macrosubfossil and diatom analyses. The palynological and macrofossil analyses give a detailed picture of the vegetational succession consisting of three Late Weichselian and three Holocene stages. The first two phases represent pioneer vegetation before the development of forests. The NAP flora is very rich with many exotic elements, i.a. Dryas octopetala. Birches have been present from the beginning, first as solitary copses but by the end of the Late Weichselian as light forests. Betula nana characterizes the intermediate phase between open vegetation and forest. The Holocene forests have been dominated by pine and birches. The diatom succession reflects a development from cold, slightly alkaline conditions to warmer ones with increased alkalinity, and again to a colder and less alkaline state.