{"id":4252,"date":"2026-01-09T18:57:30","date_gmt":"2026-01-09T23:57:30","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/ewemodel\/?post_type=chapter&p=4252"},"modified":"2026-01-14T12:53:35","modified_gmt":"2026-01-14T17:53:35","slug":"ecosystem-based-hcr","status":"publish","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/ewemodel\/chapter\/ecosystem-based-hcr\/","title":{"raw":"Ecosystem-based harvest control rules","rendered":"Ecosystem-based harvest control rules"},"content":{"raw":"

Evaluating ecosystem-based harvest control rules: How do different ecosystem-based harvest control rules perform compared to single-species management approaches in terms of ecosystem health and fisheries sustainability<\/h2>\r\n
\r\n

By analysing this overarching question in EwE, one can compare ecosystem-based and single-species harvest control rules (HCR). This may provide insights into the potential benefits and challenges of implementing ecosystem-based fisheries management, helping to inform policy decisions and contribute to improving the sustainability of fisheries while maintaining ecosystem health.<\/p>\r\n\r\n

Potential policy questions<\/h3>\r\n
    \r\n \t
  1. Multi-species interactions: How do ecosystem-based HCRs account for predator-prey relationships and competition between species compared to single-species approaches?<\/li>\r\n \t
  2. Trophic cascades: Do ecosystem-based HCRs better mitigate unintended trophic cascades that might occur under single-species management?<\/li>\r\n \t
  3. Ecosystem indicators: Which ecosystem indicators (e.g., mean trophic level, biomass ratios, diversity indices) are most sensitive to differences between the two management approaches?<\/li>\r\n \t
  4. Fisheries yield: How do total and species-specific yields (amounts and values) compare between ecosystem-based and single-species HCRs over short and long time scales?<\/li>\r\n \t
  5. Stability and variability: Which approach leads to more stable ecosystems and fisheries yields over time, especially under environmental variability?<\/li>\r\n \t
  6. Trade-offs: How do ecosystem-based HCRs handle trade-offs between different management objectives (e.g., maximizing yield vs. maintaining ecosystem structure) compared to single-species approaches?<\/li>\r\n \t
  7. Bycatch and discards: Do ecosystem-based HCRs lead to reductions in bycatch and discards compared to single-species management?<\/li>\r\n \t
  8. Recovery of depleted stocks: How do the two approaches compare in their ability to facilitate the recovery of overexploited species while maintaining ecosystem function?<\/li>\r\n \t
  9. Resilience to perturbations: Which management approach results in ecosystems more resilient to environmental changes or fishing pressure fluctuations?<\/li>\r\n \t
  10. Economic outcomes: How do the economic returns from fisheries differ between ecosystem-based and single-species HCRs, considering both short-term and long-term perspectives?<\/li>\r\n \t
  11. Implementation complexity: What are the practical challenges of implementing ecosystem-based HCRs compared to single-species approaches, and how might these affect outcomes?<\/li>\r\n \t
  12. Data requirements: How do the data needs differ between the two approaches, and how sensitive are the outcomes to data limitations?<\/li>\r\n \t
  13. Spatial management: How can spatial considerations be incorporated into ecosystem-based HCRs, and how does this compare to spatial aspects of single-species management?<\/li>\r\n \t
  14. Climate change scenarios: How do the two management approaches perform under various climate change scenarios, particularly regarding species range shifts and productivity changes?<\/li>\r\n \t
  15. Regime shifts: Can ecosystem-based HCRs better detect or prevent potential regime shifts compared to single-species approaches?<\/li>\r\n \t
  16. Time lags: How do the two approaches differ in their ability to account for and respond to time lags in ecosystem responses to management actions?<\/li>\r\n \t
  17. Uncertainty handling: How do ecosystem-based and single-species HCRs compare in their robustness to various sources of uncertainty (e.g., environmental, biological, implementation)?<\/li>\r\n \t
  18. Indicator species: Are there key species or functional groups that serve as particularly good indicators of the relative performance of the two management approaches?<\/li>\r\n \t
  19. Ecosystem services: How do the two approaches compare in maintaining a broader range of ecosystem services beyond fisheries production?<\/li>\r\n \t
  20. Adaptability: Which approach allows for more effective management as new information becomes available or ecosystem conditions change?<\/li>\r\n<\/ol>\r\n<\/div>","rendered":"

    Evaluating ecosystem-based harvest control rules: How do different ecosystem-based harvest control rules perform compared to single-species management approaches in terms of ecosystem health and fisheries sustainability<\/h2>\n
    \n

    By analysing this overarching question in EwE, one can compare ecosystem-based and single-species harvest control rules (HCR). This may provide insights into the potential benefits and challenges of implementing ecosystem-based fisheries management, helping to inform policy decisions and contribute to improving the sustainability of fisheries while maintaining ecosystem health.<\/p>\n

    Potential policy questions<\/h3>\n
      \n
    1. Multi-species interactions: How do ecosystem-based HCRs account for predator-prey relationships and competition between species compared to single-species approaches?<\/li>\n
    2. Trophic cascades: Do ecosystem-based HCRs better mitigate unintended trophic cascades that might occur under single-species management?<\/li>\n
    3. Ecosystem indicators: Which ecosystem indicators (e.g., mean trophic level, biomass ratios, diversity indices) are most sensitive to differences between the two management approaches?<\/li>\n
    4. Fisheries yield: How do total and species-specific yields (amounts and values) compare between ecosystem-based and single-species HCRs over short and long time scales?<\/li>\n
    5. Stability and variability: Which approach leads to more stable ecosystems and fisheries yields over time, especially under environmental variability?<\/li>\n
    6. Trade-offs: How do ecosystem-based HCRs handle trade-offs between different management objectives (e.g., maximizing yield vs. maintaining ecosystem structure) compared to single-species approaches?<\/li>\n
    7. Bycatch and discards: Do ecosystem-based HCRs lead to reductions in bycatch and discards compared to single-species management?<\/li>\n
    8. Recovery of depleted stocks: How do the two approaches compare in their ability to facilitate the recovery of overexploited species while maintaining ecosystem function?<\/li>\n
    9. Resilience to perturbations: Which management approach results in ecosystems more resilient to environmental changes or fishing pressure fluctuations?<\/li>\n
    10. Economic outcomes: How do the economic returns from fisheries differ between ecosystem-based and single-species HCRs, considering both short-term and long-term perspectives?<\/li>\n
    11. Implementation complexity: What are the practical challenges of implementing ecosystem-based HCRs compared to single-species approaches, and how might these affect outcomes?<\/li>\n
    12. Data requirements: How do the data needs differ between the two approaches, and how sensitive are the outcomes to data limitations?<\/li>\n
    13. Spatial management: How can spatial considerations be incorporated into ecosystem-based HCRs, and how does this compare to spatial aspects of single-species management?<\/li>\n
    14. Climate change scenarios: How do the two management approaches perform under various climate change scenarios, particularly regarding species range shifts and productivity changes?<\/li>\n
    15. Regime shifts: Can ecosystem-based HCRs better detect or prevent potential regime shifts compared to single-species approaches?<\/li>\n
    16. Time lags: How do the two approaches differ in their ability to account for and respond to time lags in ecosystem responses to management actions?<\/li>\n
    17. Uncertainty handling: How do ecosystem-based and single-species HCRs compare in their robustness to various sources of uncertainty (e.g., environmental, biological, implementation)?<\/li>\n
    18. Indicator species: Are there key species or functional groups that serve as particularly good indicators of the relative performance of the two management approaches?<\/li>\n
    19. Ecosystem services: How do the two approaches compare in maintaining a broader range of ecosystem services beyond fisheries production?<\/li>\n
    20. Adaptability: Which approach allows for more effective management as new information becomes available or ecosystem conditions change?<\/li>\n<\/ol>\n<\/div>\n","protected":false},"author":1909,"menu_order":6,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[49],"contributor":[],"license":[],"class_list":["post-4252","chapter","type-chapter","status-publish","hentry","chapter-type-numberless"],"part":4232,"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/ewemodel\/wp-json\/pressbooks\/v2\/chapters\/4252","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.bccampus.ca\/ewemodel\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/pressbooks.bccampus.ca\/ewemodel\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/ewemodel\/wp-json\/wp\/v2\/users\/1909"}],"version-history":[{"count":2,"href":"https:\/\/pressbooks.bccampus.ca\/ewemodel\/wp-json\/pressbooks\/v2\/chapters\/4252\/revisions"}],"predecessor-version":[{"id":4312,"href":"https:\/\/pressbooks.bccampus.ca\/ewemodel\/wp-json\/pressbooks\/v2\/chapters\/4252\/revisions\/4312"}],"part":[{"href":"https:\/\/pressbooks.bccampus.ca\/ewemodel\/wp-json\/pressbooks\/v2\/parts\/4232"}],"metadata":[{"href":"https:\/\/pressbooks.bccampus.ca\/ewemodel\/wp-json\/pressbooks\/v2\/chapters\/4252\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/ewemodel\/wp-json\/wp\/v2\/media?parent=4252"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/ewemodel\/wp-json\/pressbooks\/v2\/chapter-type?post=4252"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/ewemodel\/wp-json\/wp\/v2\/contributor?post=4252"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/ewemodel\/wp-json\/wp\/v2\/license?post=4252"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}