How would the toucan population be affected if the population of trees in its habitat decreased dramatically?

Toucans are like the Cassowary. They both eat fruit from trees in the rainforest and then when they fly around, the seeds are spread all over the plantation, allowing more trees to grow so they don't die out or group together and suffocate each other. If we didn't have the Toucan or Cassowary it is quite possible that we wouldn't have rain forests altogether. That would affect the atmosphere, greenhouse gasses and us hugely. Hope I answered your question!