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Using Transfer Function Analysis to develop biologically and economically efficient restoration strategies.

Lalasia Bialic-Murphy1,2, Orou G Gaoue3,4,5,6, Tiffany Knight7,8,9

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This summary is machine-generated.

Economically efficient restoration for endangered species involves targeted threat control. Suppressing rodents to boost fertility is the most cost-effective strategy for species persistence.

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Area of Science:

  • Ecology
  • Conservation Biology
  • Restoration Ecology

Background:

  • Rare species face multiple threats requiring intensive restoration efforts, including population reintroduction and threat control.
  • Determining the necessary level of threat control for long-term species persistence post-reintroduction is crucial.
  • Restoration actions are time-intensive and costly, necessitating economically efficient strategies.

Purpose of the Study:

  • To evaluate the impact of biologically significant increases in demographic rates on the persistence of a reintroduced endangered Hawaiian shrub, Delissea waianaeensis.
  • To compare the cost-effectiveness of different threat control strategies for endangered species restoration.
  • To integrate economic cost analysis with demographic modeling for pragmatic restoration planning.

Main Methods:

  • Utilized transfer function analysis to model population dynamics.
  • Incorporated economic cost analysis to assess the financial viability of management actions.
  • Examined the effects of increased fertility (via rodent suppression) and seedling growth (via mollusc suppression) on population stability (λ=1).

Main Results:

  • An increase in fertility of 0.419 (from rodent suppression) or seedling growth of 0.098 (from mollusc suppression) would stabilize the population.
  • While greater fertility increase was needed for persistence, rodent suppression to increase fertility proved most cost-effective.
  • Demonstrated that large increases in vital rates significantly impact population projections.

Conclusions:

  • Integrating economic costs into demographic models is essential for developing effective endangered species restoration plans.
  • Targeted threat suppression, specifically rodent control to enhance fertility, offers a cost-effective restoration strategy.
  • This approach highlights the importance of considering the economic implications of conservation actions for long-term success.