The location and general biodiversity of tropical rainforests and boreal forests agree with what you would predict according to the latitudinal gradient pattern There are some countries that are in tropical rainforests and most countries are in the Boreal forest.
Latitudinal gradients affect the biodiversity of Earth's biomes. For example, tropical dry forests and rainforests tend to have far more species than tundra and boreal forests. Plant productivity and climate stability appear to be at least partly responsible for this pattern.
Boreal forest biomes have much lower biodiversity than tropical forest biomes. Only a few tree species usually dominate the boreal forest. Low temperatures and day length (photoperiod) can limit NPP in boreal forests.
Latitudinal gradients of biodiversity are biogeographic patterns that define the way in which components of taxonomic, phylogenetic, functional, genetic, or phenetic dimensions change with a latitudinal position on the surface of the earth.
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