Bound Ngawha Hg genes, measured gaseous mercury and conceptual coupling #1638

CommunityMech:000243; PMID:32414793. Whole author manuscript read, with Table2 visually checked. hgcA-bearing Cub Bath sequences could not be binned; mer genes support potential rather than measured microbial flux. Atmospheric Hg(0) was measured but its microbial contribution was not isolated from geogenic/abiotic sources. Keep these positive findings. Remove the one remaining geochemistry-to-diversity context arrow and unsupported NICHE_PARTITIONING/SYNTROPHY classifications; distinguish snapshot diversity from temporal stability and preserve the prior four-edge removal. Replace aim-fragment evidence with short actual-result excerpts, provenance preserved. Close only after protected-main merge.

Source-based self-adversarial review, not independent approval. Dedup:920 all-state issue title/body records plus ignored/hidden-inclusive local search; matching969-972 read. No exhaustive PR-comment audit.