Mechanisms underlying local functional and phylogenetic beta diversity in two temperate forests

Area of Science:

• Ecology
• Forest Ecology
• Community Ecology

Background:

• Studies on forest community structure often focus on alpha diversity, neglecting spatially explicit functional beta diversity at local scales.
• Functional beta diversity, which considers trait variation, is crucial for understanding community assembly mechanisms.
• Previous research has not adequately explored functional beta diversity patterns at local, spatially explicit scales.

Purpose of the Study:

• To develop and apply a novel methodology for assessing local phylogenetic and functional beta diversity.
• To determine the relative importance of ecological processes (habitat filtering, dispersal limitation, species interactions) in shaping these diversity patterns.
• To compare findings with previous studies on species beta diversity in the same forests.

Main Methods:

• Utilized spatial point pattern analysis on fully mapped tree data from two large temperate forest plots.
• Analyzed phylogenetic and functional beta diversity across various spatial scales.
• Quantified the influence of habitat filtering, dispersal limitation, and species interactions.

Main Results:

• A hierarchical influence of ecological processes was observed across spatial scales.
• Habitat filtering was dominant at larger distances (150-250 m) for both phylogenetic and functional beta diversity.
• Dispersal limitation influenced patterns below 150 m, while species interactions played a minor role at the immediate neighborhood scale (<20 m).

Conclusions:

• Habitat filtering and dispersal limitation are key drivers of local phylogenetic and functional beta diversity.
• These findings contrast with previous studies emphasizing dispersal limitation for species beta diversity.
• Phylogenetic and functional beta diversity offer unique insights into local community assembly mechanisms beyond species composition.