Fig. 5: Taxonomic shifts in surface and mesopelagic waters during marine heatwaves.
From: Marine heatwaves modulate food webs and carbon transport processes
Heat trees showing changes in prokaryotic (A, B) and eukaryotic (C, D) taxon abundance during 2015 and 2019 MHWs in surface mixed layer (A, C) and mesopelagic (B, D) waters at P20 and P26. Significant differences were determined using a Wilcoxon Rank Sum Test. Only samples from spring and summer Line P cruises were considered in this comparison since these samples were from months when the BGC-Argo floats detected anomalies in POC concentrations. The log2 ratio of the median of proportions for each significantly different sample group is displayed by the color of the nodes and edges in the heat tree while the node size is scaled to the average relative abundance of that taxon in the associated depth range. Surface mixed layer and mesopelagic waters were considered separately for this statistical analysis, given clear differences in prokaryotic and eukaryotic community structure with depth (See Fig. S7).
