Ecohydrological controls on apparent rates of peat carbon accumulation in a boreal bog record from the Hudson Bay Lowlands, northern Ontario, Canada

Abstract A multiproxy Holocene record from a bog in the Hudson Bay Lowlands, northern Ontario, Canada, was used to evaluate how ecohydrology relates carbon accumulation. The study site is located at somewhat higher elevation and on coarser grained deposits than surrounding peatlands. This promotes better drainage thus slower rate of accumulation relative sites with similar initiation age. peat vertical accretion initially low as transitioned marsh rich fen. These lower rates took place during warmer temperatures thermal maximum, confirming importance hydrological controls limiting local scale. Testate amoebae, pollen, plant macrofossils indicate transition poor fen then late Holocene, reconstructed water table depth increased. bacterial membrane lipid biomarker indices infer paleotemperature show summer temperature bias appear sensitive changes type. pH proxy indicates subsequent transition, which are supported by macrofossil, testate amoeba records.