Heterocysts of Rivularia Type for Interpreting a Palaeoenvironmental Context of the Late Quaternary in Northern Italy

This paper presents new results on a quali-quantitative analysis of the heterocysts Rivularia type as key bioindicator informative local eutrophic conditions. The is usually reported in palynological analyses due to thick, multilayered envelope that ensures preservation sediments. Samples come from two continuous terrestrial cores (N-S3: 77 samples, C-S1: 20 samples) drilled area surrounding Bronze Age site Terramara S. Rosa di Poviglio (Po Plain; N Italy) and spanning at least over last 15 ka years. Concentrations percentages type, combined with pollen curves wet environments, describe variability rapid changes ecological conditions millennia deposition. Given abundance diversity studied this attempts group these cells based morphology (ellipsoidal or elongated) state sheaths (presence absence). Actually, it difficult confirm relationship between heterocyst morphologies presence different cyanobacteria species. Increasingly accurate identification biostratigraphical archives may improve data available bioindicators for achieving more detailed decoding wetland (and terrestrial) transformations. Since most recent levels, be good indicator agriculture livestock, which lead trophic water soil.