Patterns of species ranges, speciation, and extinction

Area of Science:

• Evolutionary Biology
• Ecological Modeling
• Speciation Research

Background:

• The interplay between species range size, speciation, and extinction remains poorly understood.
• Factors promoting large ranges (e.g., broad niches, high dispersal) may impede local adaptation, while isolation can limit advantageous mutations.

Purpose of the Study:

• To investigate the complex relationships among species range sizes, speciation, and extinction events.
• To model the evolutionary dynamics of populations and their range formation.

Main Methods:

• Utilized a large-scale, spatially explicit, individual-based model.
• Simulated evolutionary dynamics of hundreds of thousands of diploid individuals over 200,000 generations.
• Incorporated adaptation to multiple resources and multidimensional trait space.

Main Results:

• Species range sizes positively correlate with dispersal abilities.
• High dispersal abilities and low resource costs negatively impact speciation rates.
• Resource distribution significantly affects speciation, with fragmented landscapes reducing speciation rates.

Conclusions:

• Dispersal ability is a key determinant of species range size.
• Broad niche widths, favored by high dispersal, can suppress speciation.
• Landscape fragmentation presents a novel constraint on speciation rates.