Species range contractions in geographic and environmental space

Area of Science:

• Ecology
• Conservation Biology
• Environmental Science

Background:

• Species range contractions are increasingly prevalent globally due to anthropogenic pressures.
• Previous studies show mixed results regarding consistent patterns in range contractions across different taxa.
• Understanding these patterns is crucial for effective conservation in the Anthropocene.

Purpose of the Study:

• To present a novel framework explaining the variation in species range contraction patterns.
• To conceptualize range contractions as a result of intrinsic population growth rates and external threats across environmental gradients.
• To identify predictable patterns of species decline for improved conservation strategies.

Main Methods:

• Developed a theoretical framework integrating species' intrinsic population growth rates.
• Modeled the impact of various threats across environmental gradients.
• Analyzed how these factors interact to produce distinct range contraction patterns.

Main Results:

• Identified four primary patterns of species range contraction.
• Described a fifth pattern emerging under conditions of incomplete threat spread.
• The framework elucidates the conditions under which specific contraction patterns occur.

Conclusions:

• The proposed framework advances the understanding of species' responses to global change.
• It provides a basis for developing more generalizable and effective conservation strategies.
• Predicting range contraction patterns is key to mitigating biodiversity loss.