Temporal changes in spatial variation: partitioning the extinction and colonisation components of beta diversity

Area of Science:

• Ecology
• Biodiversity Science
• Community Ecology

Background:

• Beta diversity, the spatial variation in species composition, has changed significantly over the past two decades.
• Quantifying the underlying extinction and colonization processes driving these changes has been analytically challenging for empirical ecologists.

Purpose of the Study:

• To develop a novel numerical method for additively partitioning temporal changes in beta diversity.
• To identify and quantify the contributions of local extinctions and colonizations to observed beta diversity dynamics.

Main Methods:

• Development of a new numerical method to partition beta diversity changes.
• Application of the method to empirical datasets from forest and coral reef communities.

Main Results:

• The method revealed previously undetectable spatiotemporal community dynamics.
• In forests, local extinctions increased spatial heterogeneity, while colonizations caused homogenization.
• Coral communities showed non-random disassembly and reassembly post-perturbation, with a dynamic balance of extinctions and colonizations.

Conclusions:

• Partitioning beta diversity dynamics provides mechanistic insights into biodiversity organization.
• The novel method enhances understanding of ecological community changes over time and space.