Fig. 3: Multivariate ordination analyses conducted on morphological and DNA assemblages reveal the influence of examined environmental variables on taxa composition.

Taxa-environment Canonical Correspondence Analysis (CCA) biplots of morphological (a) and DNA (b) taxa that exceed 5% of the assemblage in at least one sample. The lengths of the environmental arrows on the taxa-environment biplot approximate their relative importance of influence on the foraminiferal assemblage. Arrow direction reflects its approximate correlation with the ordination axes and other environmental factors, and the perpendicular projection of taxa position on the environmental arrow indicate their weighted average optima along each environmental variable. The first two axes of eDNA and morphological CCA explained 16% and 37% of total variance, respectively. Non-metric Multi-Dimensional Scaling (NMDS) ordination of morphological (c) and DNA (d) assemblages of all modern surface sampling stations and core samples based on Bray-Curtis dissimilarities. Samples collected from MP_A, MP_B and SK transect were marked with different colors. Core samples are shown as depth below surface (cm). Grey lines indicate the relative standardized water level index units (SWLI) elevations associated with sample positions in NMDS ordination space. Some major undermined OTUs and assigned taxa of eDNA assemblage are shown. Taxa names are written in abbreviation (Supplementary Data 7, 8).