**5. Conclusions**

The annual Brazil nut seed production in the Brazilian Amazon concentrated in five mesoregions between 1990 and 2021. Data analysis did not reveal a significant relationship between climatic variables and Brazil nut volume in the Baixo Amazonas mesoregion when considering data from the same year. However, significant relationships were identified between the volume of Brazil nuts in the base year and climatic variables from 1 year before seed collection, except for total precipitation. While relative humidity has a positive influence on seed volume, vapor pressure deficit and temperature had negative effects.

Maximum temperature stood out as the most influential climatic variable in the annual variation of Brazil nut production in the Baixo Amazonas. The trends of
