Disturbance and change in biodiversity

Area of Science:

• Ecology
• Biodiversity Science
• Ecological Modeling

Background:

• Understanding disturbance impacts on biodiversity is crucial for ecological theory and conservation.
• Disturbances can manifest through various mechanisms affecting populations and communities.
• Quantifying these effects requires robust analytical and simulation approaches.

Purpose of the Study:

• To investigate how different types of ecological disturbances affect key biodiversity metrics.
• To differentiate the impacts of mortality rate (D), reproductive rate (B), and carrying capacity (K) disturbances.
• To explore the effects of composite disturbances and community isolation on biodiversity.

Main Methods:

• Simulations of neutral ecological communities were employed.
• Biodiversity metrics including species richness, total abundance, and species abundance distributions were analyzed.
• Comparisons were made between disturbed and undisturbed communities, and pre- and post-disturbance states.

Main Results:

• Carrying capacity (K) disturbances exhibited the most severe impacts on biodiversity, followed by mortality rate (D) disturbances.
• Reproductive rate (B) disturbances showed negligible effects on biodiversity metrics.
• Composite disturbances (DBK) presented complex dynamics, with negative correlations between disturbance types leading to unimodal relationships.
• Community isolation amplified negative disturbance consequences and reduced positive effects.

Conclusions:

• The type and combination of disturbance significantly influence biodiversity outcomes.
• Carrying capacity and mortality rate shifts are key drivers of biodiversity change, whereas reproductive rate shifts are less impactful.
• Community isolation acts as a critical factor, exacerbating biodiversity loss under disturbance regimes.