Gamma diversity and under-sampling together generate patterns in beta-diversity.

Area of Science:

• Ecology
• Community Ecology
• Biodiversity Research

Background:

• Beta diversity links local and regional species pools, offering insights into community assembly mechanisms.
• Geographic gradients can influence beta diversity patterns, but are affected by species pool size and local abundance.

Purpose of the Study:

• To explore how regional species pools, abundance distributions, and local abundance affect beta diversity patterns.
• To investigate the interplay between species pool limitations and under-sampling effects on beta diversity estimates.
• To demonstrate these effects using empirical data from ant communities along an elevational gradient.

Main Methods:

• Exploration of theoretical effects of species pools and abundance on beta diversity.
• Graphical methods to highlight under-sampling effects on gamma-beta diversity relationships.
• Analysis of empirical data on ant communities across an elevational gradient in the Eastern Himalayas.

Main Results:

• Beta diversity patterns are distinctly influenced by species pool limits and under-sampling.
• Under-sampling effects can alter established relationships between gamma and beta diversity.
• A shift from species pool reduction to under-sampling effects was observed at mid-elevations in ant communities.

Conclusions:

• Multiple ecological processes with contrasting effects simultaneously shape beta diversity across geographic gradients.
• Accurate estimation of beta diversity requires consideration of both regional species pool size and local sampling intensity.
• Elevational gradients can reveal complex interactions between factors driving biodiversity patterns.