Insular threat associations within taxa worldwide

Area of Science:

• Ecology
• Conservation Biology
• Biodiversity Science

Background:

• Global biodiversity loss is a significant environmental crisis.
• Previous studies on threats to species decline often focus on limited geographic areas, taxonomic groups, and individual threats.
• The interactions between multiple threats are frequently overlooked, hindering effective conservation strategies.

Purpose of the Study:

• To investigate 11 major threats contributing to species decline on islands globally.
• To analyze the associations between multiple threats and their impact on various taxa (vertebrates, invertebrates, plants).
• To identify the most significant drivers of species extinction and decline in insular ecosystems worldwide.

Main Methods:

• Utilized network analyses to examine the complex interactions of multiple threats.
• Assessed data from 15 insular regions across the globe.
• Focused on the impact of threats on vertebrates, invertebrates, and plants.

Main Results:

• Biological invasions, wildlife exploitation, and cultivation were identified as the top three drivers of species decline and extinction on islands.
• Wildlife exploitation and cultivation predominantly affect threatened plants and terrestrial vertebrates.
• Biological invasions pose the greatest threat to invertebrates and freshwater fish.
• Geographic variations exist, with Indian Ocean and Asian coastal islands more impacted by exploitation and cultivation, while Pacific and Atlantic islands face greater threats from invasions.
• Threat associations vary significantly across different spatial scales.

Conclusions:

• Understanding the interconnectedness of threats is crucial for effective conservation.
• Analyzing threats in isolation is insufficient for developing robust conservation policies and management plans.
• The findings provide a global perspective on island biodiversity threats, highlighting the need for integrated conservation approaches.