Previous Year Question

Biodiversity represents the genetic, species, and ecological diversity of organisms present within an Ecosystem. Its increase is influenced by processes such as Ecosystem Productivity, resource availability, Habitat Heterogeneity, environmental disturbance, and Ecological Succession. A smaller number of Trophic Levels is not, by itself, a factor that promotes biodiversity. The presence of producers, herbivores, carnivores, and decomposers at different trophic levels plays an important role in maintaining complex feeding relationships and energy flow within an ecosystem.

Ecosystem Productivity represents the rate of Biomass production or energy accumulation per unit area or volume over a specified period. Green plants and algae convert solar energy into chemical energy through Photosynthesis, forming the basis of Primary Productivity. Under conditions of higher productivity, increased availability of food, energy, and other resources may create greater opportunities for Species Coexistence. However, the relationship between productivity and biodiversity is not always Linear. Under extremely high productivity, the dominance of certain competitive species may increase, potentially reducing the abundance of other species.

According to the Intermediate Disturbance Hypothesis (IDH), disturbances of moderate intensity or frequency may promote Species Diversity under certain ecological conditions. This hypothesis was proposed by Joseph Connell in 1978, particularly to explain diversity patterns in ecological communities. Under very low disturbance, competitively dominant species may displace other species, whereas severe disturbances may eliminate numerous sensitive species. Intermediate disturbances can create opportunities for the coexistence of species possessing different competitive abilities. However, modern ecological research indicates that this hypothesis does not apply equally to all ecosystems.

Ecosystem Age and Ecological Succession also influence biodiversity. In a newly formed or disturbed habitat, Pioneer Species initially become established. Over time, soil development, accumulation of organic matter, increasing complexity of vegetation structure, and greater diversity of Microhabitats may create opportunities for additional species to establish themselves. In contrast, Fewer Trophic Levels do not independently promote biodiversity. Trophic Levels represent the feeding positions of organisms within a Food Chain, whereas a Food Web connects numerous feeding relationships among different species. The number of trophic levels alone cannot determine the total species diversity of an ecosystem.