Top predators determine how biodiversity is partitioned across time and space

Area of Science:

• Ecology
• Biodiversity Science
• Community Ecology

Background:

• Natural ecosystems exhibit biodiversity patterns influenced by spatial and temporal dynamics.
• Understanding how biodiversity is partitioned across space and time is crucial but not fully elucidated.
• Habitat characteristics can predictably influence the relationship between temporal and spatial biodiversity patterns.

Discussion:

• This study investigated spatio-temporal beta-diversity patterns in larval dragonfly communities across a natural predation gradient.
• Variation in top predator identity (invertebrates to fish) was linked to systematic differences in spatio-temporal beta-diversity.
• Habitat characteristics mediate the interplay between spatial and temporal biodiversity partitioning.

Key Insights:

• Increasing top predator size (from invertebrates to fish) resulted in lower species turnover across sites and years.
• Larger predators led to relatively higher seasonal species turnover within sites.
• This shift in turnover dynamics alters the relative partitioning of biodiversity between time and space.

Outlook:

• Findings extend community assembly theory by revealing mechanisms linking spatial and temporal beta-diversity.
• Predictable shifts in biodiversity partitioning based on predator size and habitat offer insights for conservation.
• Further research can explore these dynamics in other ecosystems and with different community compositions.