Final answer:
Bostrichids are most abundant in the tropics, an area known for high biodiversity and endemism but also threatened by potential biodiversity loss.
Step-by-step explanation:
Bostrichids are indeed most abundant in the tropics, which aligns with the fact that biodiversity and endemism levels are the highest in tropical regions. These areas are notable for their biodiversity hotspots and the unique variety of species they contain. However, despite this richness, the understanding of species diversity in these regions is quite low, leading to a higher potential for biodiversity loss due to environmental changes and human activities.