Do species' traits predict recent shifts at expanding range edges?

Area of Science:

• Ecology
• Climate Change Biology
• Conservation Biology

Background:

• Organisms are shifting ranges in response to climate change, but species' capacities to track rapid changes remain unclear.
• Understanding range shift abilities is crucial for assessing extinction risks and predicting future ecological communities.
• Colonization at expanding range fronts depends on reproduction, dispersal, and establishment in novel habitats.

Purpose of the Study:

• To assess the relationship between species' traits and their leading-edge range shifts.
• To determine if species traits can predict range expansion under climate change.
• To identify challenges in developing trait-based forecasts for species' range shifts.

Main Methods:

• Reviewed existing evidence linking species' traits to range shifts.
• Analyzed datasets, including diet breadth in North American Passeriformes and egg-laying habitat in British Odonata.
• Evaluated the explanatory power of trait-based models for range shifts.

Main Results:

• Some expected relationships between species' traits (e.g., diet breadth, habitat generalization) and range shifts were observed.
• However, the overall explanatory power of these models was low.
• Statistically and biologically significant relationships had limited predictive utility.

Conclusions:

• While certain species traits correlate with range shifts, current models are insufficient for accurate conservation and management predictions.
• Challenges include quantifying species' natural history variation and integrating extrinsic factors like habitat fragmentation.
• Improved forecasting requires addressing data limitations and complex interactions between species traits and environmental changes.