Population and geographic range dynamics: implications for conservation planning

Area of Science:

• Ecology and Conservation Biology
• Population Dynamics
• Biodiversity Science

Background:

• Global biodiversity is declining, with concerns about species populations, conservation status, and habitat quality.
• Understanding the drivers of these declines is crucial for effective conservation strategies.
• Biodiversity trends vary significantly among species, necessitating detailed analysis of population and distribution changes.

Purpose of the Study:

• To identify changing drivers of population and geographic range changes in species.
• To determine biological and geographical correlates of species experiencing population increases or decreases.
• To inform conservation planning by understanding the dynamics of threat processes.

Main Methods:

• Analysis of two large datasets: local population sizes of vertebrates since 1970 and distributions of Galliform birds over two centuries.
• Dissection of changing drivers affecting population and geographic range.
• Identification of biological and geographical correlates associated with population trends.

Main Results:

• Weak evidence for ecological and biological traits predicting local declines in range or abundance.
• Stronger evidence linking local anthropogenic threats and environmental change to population declines.
• Significant variation exists among species, with some declining rapidly while others remain stable or increase.

Conclusions:

• Local anthropogenic threats and environmental change are primary drivers of biodiversity loss.
• Conservation planning requires a better understanding of how threat processes impact different species.
• Future conservation efforts must address specific local threats and environmental changes to mitigate biodiversity declines.