How useful are thermal vulnerability indices?

Area of Science:

• Ecology
• Climate Change Biology
• Conservation Science

Background:

• Thermal vulnerability indices are increasingly used to predict climate change effects on ecosystems.
• These indices assess species' safety margins and warming tolerances.

Purpose of the Study:

• To provide a comprehensive overview of thermal vulnerability indices.
• To examine their history, formulation, applications, and underlying assumptions.
• To identify biases and limitations in current index approaches.

Main Methods:

• Literature review and synthesis of existing research on thermal vulnerability indices.
• Analysis of index formulation, including thermal environment characterization and organismal responses.
• Identification and discussion of biases and ecological relevance.

Main Results:

• Discrepancies in terminology and usage of thermal vulnerability indices are common.
• Key assumptions and potential biases in index formulation require careful evaluation.
• Current indices face limitations due to outstanding questions regarding their ecological and evolutionary relevance.

Conclusions:

• Further development of thermal vulnerability indices is needed.
• Validation methods for index applications should be established.
• Addressing identified biases and assumptions is crucial for accurate climate change impact forecasting.