The article explores how species and size diversity in forests are connected through spatial patterns. By using statistical methods, the researchers found that the way tree species spread out and the sizes of trees within a species are linked. They discovered that if different species have different size ranges, the diversity of tree sizes in a forest is mainly influenced by how the species are spread out. This means that conservation efforts can focus on either species diversity or size diversity. In diverse forests, the connections between species and size diversity can be less strong because some species have similar size distributions.