Freshwater Biogeochemical Hotspots: High Primary Production and Ecosystem Respiration in Shallow Waterbodies

作者：Joseph S. Rabaey, Meredith A. Holgerson, David C. Richardson, Mikkel René Andersen, Sheel Bansal, Lauren E. Bortolotti, James B. Cotner, Daniel J. Hornbach, Kenneth Thorø Martinsen, Eric K. Moody, Olivia F. Schloegel · 发表于：Geophysical Research Letters · 年份：2024 · DOI：10.1029/2023gl106689 · 被引用次数：26 · 研究领域：Aquatic Ecosystems and Phytoplankton Dynamics、Marine and coastal ecosystems、Fish Ecology and Management Studies

Abstract Ponds, wetlands, and shallow lakes (collectively “shallow waterbodies”) are among the most biogeochemically active freshwater ecosystems. Measurements of gross primary production (GPP), respiration (R), and net ecosystem production (NEP) are rare in shallow waterbodies compared to larger and deeper lakes, which can bias our understanding of lentic ecosystem processes. In this study, we calculated GPP, R, and NEP in 26 small, shallow waterbodies across temperate North America and Europe. We observed high rates of GPP (mean 8.4 g O 2 m −3 d −1 ) and R (mean −9.1 g O 2 m −3 d −1 ), while NEP varied from net heterotrophic to autotrophic. Metabolism rates were affected by depth and aquatic vegetation cover, and the shallowest waterbodies had the highest GPP, R, and the most variable NEP. The shallow waterbodies from this study had considerably higher metabolism rates compared to deeper lakes, stressing the importance of these systems as highly productive biogeochemical hotspots.