This collection provides an overview of what is meant by the term ‘biodiversity,’ and how we measure it. The collection reviews the different levels of biodiversity, or the ‘biodiversity hierarchy’ in...This collection provides an overview of what is meant by the term ‘biodiversity,’ and how we measure it. The collection reviews the different levels of biodiversity, or the ‘biodiversity hierarchy’ including: genetic and phenotypic diversity; population diversity; species diversity; community diversity; ecosystem diversity; landscape diversity; and historical and ecological biogeographic diversity.