An important function of wetlands in the landscape is their ability to impact solute source and sink dynamics by storing and releasing solutes into the stream network. However, there is still limited understanding of how spatial and temporal variability change the role of wetlands in the landscape. In particular, it is relevant to understand how ecologically important solutes, like dissolved organic carbon (DOC) and nitrate (NO3-) are impacted by wetlands. To address this knowledge gap, we used a catchment scale study integrating across space and time in a wetland dominated catchment, Augusta Creek, Michigan USA. Our research question was: how do wetlands influence stream biogeochemistry seasonally across the Augusta Creek catchment? We hypothesized that wetlands would function as a source of DOC and sink of NO3- in summer months, and sink of DOC during winter months, with the percent wetland coverage of the subcatchment influencing the strength of source/sink behavior. To address our research question and hypothesis, we conducted repeated synoptic sampling at 28 subcatchments across a gradient of wetland coverage in the Augusta Creek catchment. To capture temporal trends, we sampled every 2-3 weeks beginning in October 2021. At each site, we sampled a suite of solutes, including DOC and NO3-. We then calculated novel ecohydrology metrics which indicate the spatial scale, direction, and stability of spatial patterns of water chemistry. Our findings show seasonal variation in DOC patterns across different subcatchments, while NO3- is more stable. Spatially, we found that larger subcatchments with intermediate wetland coverage close to the main stem act as stronger solute sources and sinks, while smaller subcatchments with high wetland coverage are weak sources and sinks. Overall, our study shows that in this wetland-dominated Michigan catchment, biogeochemistry patterns vary across season, location in the catchment, and wetland coverage.