Heterogeneity in habitat and nutrient availability facilitate the co-occurrence of N2 fixation and denitrification across wetland–stream–lake ecotones of Lakes Superior and Huron

Eberhard, Erin K.; Kane, Evan S.; Marcarelli, Amy M.

doi:10.1007/s10533-023-01090-3

Cited by 1 publication

(1 citation statement)

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“…Capturing the spatial variability in ecosystems for any process is complex, and this is especially true for quantifying N 2 fixation and denitrification across ecotones where conditions change rapidly in space and time, such as at the interface between wetlands, streams and lakes. Yet Eberhard et al (2023) endeavor to do just this as they quantify net N 2 fluxes and environmental characteristics (e.g., temperature, nutrient concentrations, organic matter content) at five sites in Lake Huron and Lake Superior, USA. While they observed that median denitrification rates (914 µg N m −2 h −1 ) were higher than median N 2 fixation rates (5.5 µg N m −2 h −1 ) -they found that the denitrification and N 2 fixation were co-occurring in almost 50% of the measured sites across all five sampling locations and all habitats.…”

Section: Landscape Heterogeneity and Connectivitymentioning

confidence: 99%

Nitrogen fixation across the aquascape: current perspectives, future priorities

Marcarelli,

Fulweiler,

Scott

2023

Biogeochemistry

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Di-nitrogen (N 2 ) fixation rates, and the diversity of the organisms that fix N 2 , remain largely unconstrained in the aquatic landscapes or aquascapes (e.g., lakes, wetlands, streams, rivers, estuaries) between land and sea. As a result, we lack a mechanistic understanding of the controls and contributions of N 2 fixation across disparate aquatic environments, and cannot accurately incorporate this process into local and global nitrogen (N) budgets. This special issue brings together papers highlighting current advances in understanding of N 2 fixation within and across all aquatic habitats, integrating novel methodology for studying N 2 fixation, quantification of N 2 fixation fluxes in understudied habitats, the role of N 2 fixation in biotic assemblages, and the rate and fate of fixed N in heterogeneous landscapes. Together, these papers address important gaps in understanding and highlight the frontiers of research on N 2 fixation in aquatic habitats.

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Section: Landscape Heterogeneity and Connectivitymentioning

confidence: 99%