Protecting and Restoring Aquatic Ecosystems in Multiple Stressor Environments

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Aquatic ecosystems around the globe are under threat from pollution, invasive species, over-exploitation, and other stressors. Given synergistic effects, policy measures to address particular stressors should be developed in tandem with policy measures to address others. We present a bio-economic model that addresses the optimal management of an aquatic ecosystem subject to multiple stressors. Specifically, we consider optimal management of a native fishery in a lake ecosystem subject to risks from pollution and an invasive species. Optimal plans exist for various cases defined by whether, one, both, or neither of the stressor events has occurred. Optimal fishery stocks vary between these cases, and depend on the order in which the stressor event occur if realized. The optimal native stock is the highest in the absence of either stressor. However, the combined influence of the multiple risks can rapidly reduce the probability of maintaining an un-invaded and un-polluted state for long. The synergistic effects of the risks interconnect optimal policies in interesting ways. We find that optimal pollution abatement in absence of both these stressors may turn out to be lower than when either or both stressors are present. The effectiveness of native fish stock in mitigating the risk of alien fish invasion can have a bearing on whether optimal native fish stock and abatement effort are used as substitutes or as complements. Pollution abatement levels that are chosen without consideration of alien invasion risk can lead indirectly to increased societal costs for invasion risk mitigation.

Original languageEnglish (US)
Article number1650011
JournalWater Economics and Policy
Volume3
Issue number2
DOIs
StatePublished - Apr 1 2017

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aquatic ecosystem
invasive species
fishery
pollution
lake ecosystem
Stressors
Ecosystem
mitigation
fish
economics
cost
policy
Fish
pollution abatement
fish stock
effect

All Science Journal Classification (ASJC) codes

  • Economics and Econometrics
  • Management, Monitoring, Policy and Law
  • Water Science and Technology
  • Business and International Management

Cite this

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Protecting and Restoring Aquatic Ecosystems in Multiple Stressor Environments. / Ranjan, Ram; Shortle, James Samuel.

In: Water Economics and Policy, Vol. 3, No. 2, 1650011, 01.04.2017.

Research output: Contribution to journalArticle

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