Bogard, Matthew

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https://hdl.handle.net/10133/7104

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Browsing Bogard, Matthew by Author "Page, Bryan"

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    Multi-decadal impacts of effluent loading on phosphorus sorption capacity in a restored wetland
    (Elsevier, 2025) Mi, Chenxi; Soued, Cynthia; Bortolotti, Lauren E.; Padiou, Pascal; Page, Bryan; Denny, Mariya; Bogard, Matthew J.
    Natural wetlands are widely used and cost-effective systems for the passive remediation of phosphorus (P)-rich surface waters from various effluent sources. Yet the long-term biogeochemical impacts of effluent loading on wetland P retention capacity are unclear. Here, we had a unique opportunity to document the spatio-temporal evolution of sediment P sorption over a ∼25-year period of constant municipal and industrial effluent loading, as part of a wetland restoration and wastewater treatment strategy in one of the largest restored wetlands in Canada. Sediment P sorption experiments across Frank Lake's three basins revealed a wide spatial variation in sorption capacity, closely linked to sediment geochemistry gradients (Ca, Fe, and Mn). Relative to a similar study ∼25 years prior, P sorption capacity has become exhausted near the effluent inlet, but remarkably, remains elevated throughout the rest of the wetland. Compared to other prairie wetlands and global aquatic ecosystems, Frank Lake has a greater capacity overall to retain P through sediment sorption. Given the paucity of long-term (multi-decade) data on wetland response to effluent loading, we provide key insights into the dynamics of wetland P cycling in human-dominated watersheds.
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    Salinity causes widespread restriction of methane emissions from small inland waters
    (Springer Nature, 2024) Soued, Cynthia; Bogard, Matthew J.; Finlay, Kerri; Bortolotti, Lauren E.; Leavitt, Peter R.; Badiou, Pascal; Knox, Sara H.; Jensen, Sydney; Mueller, Peka; Lee, Sung Ching; Ng, Darian; Wissel, Björn; Chan, Chun Ngai; Page, Bryan; Kowal, Paige
    Inland waters are one of the largest natural sources of methane (CH4), a potent greenhouse gas, but emissions models and estimates were developed for solute-poor ecosystems and may not apply to salt-rich inland waters. Here we combine field surveys and eddy covariance measurements to show that salinity constrains microbial CH4 cycling through complex mechanisms, restricting aquatic emissions from one of the largest global hardwater regions (the Canadian Prairies). Existing models overestimated CH4 emissions from ponds and wetlands by up to several orders of magnitude, with discrepancies linked to salinity. While not significant for rivers and larger lakes, salinity interacted with organic matter availability to shape CH4 patterns in small lentic habitats. We estimate that excluding salinity leads to overestimation of emissions from small Canadian Prairie waterbodies by at least 81% ( ~ 1 Tg yr−1 CO2 equivalent), a quantity comparable to other major national emissions sources. Our findings are consistent with patterns in other hardwater landscapes, likely leading to an overestimation of global lentic CH4 emissions. Widespread salinization of inland waters may impact CH4 cycling and should be considered in future projections of aquatic emissions.