Wetlands in the Mississippi River’s Balize Delta, USA showed an overall plant biomass increase with a large inter-annual change from 1988–2008.

River discharge and sediment negatively impacted the biomass over these decades, whereas river temperature had a positive impact.

The decadal plant biomass likely increased because of the impact of a 0.9 °C/decade increase in river temperature on growing season length.

The added river temperature increased the growing season 0.7 days each year from 1983–2012, or 14.7 days over the shorter biomass study period.

Climate change and land use/cover change in the catchment are likely responsible for the river and wetland biomass change in the Balize Delta.