Final answer:
The diversity of lemur species in Madagascar has dwindled due to habitat destruction caused by logging, slash-and-burn agriculture, and other human activities, compounded by economic challenges and insufficient conservation funding.
Step-by-step explanation:
The diversity of lemur species found on Madagascar has been negatively influenced primarily by habitat destruction due to human activities. These activities include extensive logging, slash-and-burn agriculture, mining operations, and the high demand for firewood. The degradation of habitats has been exacerbated by economic pressures from a burgeoning population that relies heavily on agriculture for livelihood, and insufficient funding for conservation efforts impedes the protection of these unique species and their environments.