Q 8.1 3. Give two reasons why inbreeding within a species is a matter of concern to population biologists. 8.2 1. Describe two reasons why ecosystem functions, such as productivity, may increase as species richness increases. 8.3 1. Explain how the different rates of net primary production in tropical and temperate forests might be related to differences in the species richness of the forests. 8.4 2. Explain why grazing and burning increase the diversity of plant species in grasslands? 8.5 3. Give an example of a non-native invasive species that is influencing biodiversity in ecosystems near your home. What factors contribute to its invasiveness?