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Extending Vulnerability Assessment to Include Life Stages Considerations.

Emma E Hodgson1, Timothy E Essington1, Isaac C Kaplan2

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This study introduces a new method for assessing species vulnerability to stressors like ocean acidification, considering different life stages. This approach helps prioritize conservation efforts for vulnerable marine species.

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Area of Science:

  • Marine ecology
  • Conservation science
  • Climate change impacts

Background:

  • Anthropogenic activities introduce novel stressors impacting species at multiple scales.
  • Vulnerability assessments help identify and prioritize species for monitoring and protection.
  • Existing methods often fail to account for life-stage-specific responses to stressors.

Purpose of the Study:

  • To propose a modified spatial vulnerability assessment method incorporating life-stage differences.
  • To apply this method to ocean acidification in the California Current using six key species.
  • To compare two approaches for estimating population vulnerability based on life stages.

Main Methods:

  • Assessed vulnerability of each life stage to ocean acidification.
  • Estimated population vulnerability using maximum stage vulnerability and a weighted mean across stages.
  • Utilized Lefkovitch matrix models to calculate stage-specific weights for the weighted mean approach.
  • Applied the method to krill, pteropod, pink shrimp, Dungeness crab, and Pacific hake.

Main Results:

  • Vulnerability varied significantly across life stages for all six species studied.
  • Maximum vulnerability estimates occurred across different life stages (larval, subadult, adult) without a consistent pattern.
  • Integrated vulnerability metrics differed substantially between the two estimation methods for some species.
  • Discrepancies arose when the most vulnerable life stage had a low relative weight in the population estimate.

Conclusions:

  • Life stage is a critical factor in determining species vulnerability to stressors like ocean acidification.
  • The choice of vulnerability metric (maximum vs. weighted mean) can significantly alter conservation prioritization.
  • The proposed method provides a more nuanced understanding of species vulnerability, aiding targeted conservation strategies.
  • Further research is needed to determine the optimal circumstances for applying each vulnerability estimation method.