This definition is so broad it could encompass just about any aspect of biology. Genetic Diversity - The genetic variability of individual species.
Different scientists view biodiversity in different ways.
One may be interested in simply describing the diversity of plant and animal species. This is the domain of systematics. Other individuals may be intent on finding the causes of diversity and explaining the differences in diversity between different regions of the world. Ecologists and Evolutionary Biologists fall into this category. Of course there are no clear lines between these three groups.