Forest conservation in light of climate change


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Forest conservation in light of climate change

  1. 1. Forest conservation in light of climate change Presentation made at the IUFRO –FORNESSA Regional Congress ICRAF, Nairobi, Kenya, 25 – 29 June 2012 by Emmanuel Chidumayo African Forest Forum Nairobi, Kenya
  2. 2. OUTLINE OF PRESENTATIONDefinitionsClimate change in AfricaForest conservation in light of climate change• Climate effects on trees and forests• Forest conservation• Conservation strategies under climate change•The concept of climate refugia• Resilience-Accommodation-Transformation nexusIs forest conservation possible in a changingclimate?
  3. 3. WHAT IS FOREST?Forest comes from a Latin word forestis(silva) literally meaning “wood outside”.Historical England: Forest was definedas “an area, typically owned by loyalty,kept for hunting and having its ownlaws”.In Middle English, Forest meant “ awooded area kept for hunting “ andincluded all uncultivated land with orwithout trees.
  4. 4. WHAT IS FOREST CONSERVATION?Conservatives :Forest conservation in the context ofprotectionismCounting trees and keeping natives out, whereever possibleLiberals:Forest conservation is about good forestmanagement that enhances and sustains treeand forest resources and, includingsustainable utilization in support of livelihoodsand socio-economic development.
  5. 5. WHAT IS CLIMATE CHANGE?Climate change is a shift in climate,occurring as a result of human activitiesClimate change is expressed as deviationsfrom a regional climatology determined byanalysis of long-term measurements,usually over a period of at least 30 years
  6. 6. IS CLIMATE IN AFRICA CHANGING?Yes! But its intensity and extent varies fromeco-region to eco-region.I distinguish 3 main eco-regions:The Sahel, Woodlands & savannas and moistforests.Woodlands & savannas are further dividedinto Sudanian, East African, Southern African(Zambezian) and southwest African.
  9. 9. Precipitation: FuturepatternsFluctuations in decadal mean precipitation willcontinue into the future but extreme events(floods & droughts) are likely to increase infrequency and intensity.Model predictions of future precipitationpatterns have been problematic due to largeuncertainties partly because of theunpredictable behavior of El Niño SouthernOscillation (ENSO) and the role of deforestationin influencing regional precipitation.
  10. 10. Thermal patternsAll eco-regions in Africa have beenexperiencing warming since the 1960salthough the rate of warming variesamong the eco-regions.Model predictions indicate furtherwarming in future.
  11. 11. All eco-regions have experiencedsignificant warming from the 1960s onwards
  12. 12. B1 – LOW SCENARIO FOR 2020 AND 2050 (Hulme et al., 2001)
  14. 14. Climate change affects•ecosystem services,•biodiversity,•livelihoods and•socio-economic developmentMore importantly, climate change is and willaffect tree and forest regeneration andproduction.But trees and forests also affect climateForest conservation in the light of climatechange has two important roles:1. To assist trees and forests to adapt to climatechange (Adaptation)2. To slow down climate change (Mitigation)
  16. 16. Good forest management stands on two pillars: Research and policy & practice
  17. 17. In a utopian sense:Tree and forest conservation aims atsaving all biodiversity and all ecosystemservices.In reality, due to limited resources, weneed to prioritize conservation efforts.To do this we need to set conservationobjectives and direct efforts towardspriority objectives.
  18. 18. Globally these priority conservationobjectives have been guided by the IUCN Reddata lists that categorize species by threatstatus.The highest conservation efforts are directedat the most threatened species: those that areclose to extinction and less effort is given tospecies that are least threatened.The classification is based on the populationsize of mature or reproductive individuals in aspecies.Here lies the devil in the detail.
  19. 19. THE IUCN APPROCHThis approach may not beappropriate in the light of climatethreats to species.Because in many cases it is the pre-adult stages that are mostthreatened by climate factors andtherefore climate change.
  20. 20. California valley oak (Quercus lobata) (Mclaughlin & Zavaleta, 2012)The sapling stage is more vulnerable to climatechange and whereas climate envelopemodeling based on long-lived adult treesindicated that this species would have a widerdistribution range,Modeling using the sapling stage revealed amore constricted area of distribution. So theclimate envelope for saplings was narrower andthat regeneration would be restricted to areasaround water bodies (habitat refugia).
  21. 21. Piliostigma thonningii at a Zambezian woodland site in central ZambiaLife history Sensitivity Response Responsestage to climate variable directionSeed High Germinatio Negative n rateSeedling High Mortality NegativeSapling Very high Radial Negative growthTree Low Radial Negative growth
  22. 22. IMPLICATIONS OF THE IUCN APPROACHWithout tree and forest regenerationthere will be few or no trees and forestsunder the future climate.By solely relying on the current IUCNapproach for determining conservationstatus of species:We will be conserving ghost trees andghost forests consisting of giant treezombies.
  23. 23. WHERE IS THE FUTURE TREE?Based on National Geographic
  24. 24. CONSERVATION STRATEGIES UNDER CLIMATE CHANGECurrent conservation approaches under climate change includethe following 11:1. Reduce other pressures on biodiversity2. Increase the number of protected sites3. Increase the size of individual protected sites4. Provide buffer areas around protected sites5. Improve the functional connectivity between sites6. Protect ⁄ create potential refugia for species7. Maintain or increase the habitat heterogeneity at site andlandscape scales8. Maintain species diversity within communities9. Protect natural processes10. Promote the potential for natural genetic exchange betweenpopulations11. Control invasive species
  25. 25. How practical is it to applythese conservation approachesunder climate change.For us to use these approaches we need tofirst understand the functional traits of thespecies, especially knowledge about howspecies respond to climate factors.
  26. 26. How practical is it to apply theseconservation approaches underclimate change.On the basis of responses to climate factors, speciescan be classified as:Insensitive or neutral: These species will most likelypersist under climate change.Sensitive: these species can be divided into twogroups.Adaptors: These species will not only persist but alsoincrease demographically and expand spatially.Vulnerable: These species will fail to adapt andtherefore become extinct.
  27. 27. Brachystegia (miombo) woodland in ZambiaResults also depend on the response variable used in the screening process.
  28. 28. Another study in South Africa focused on the dispersal traits among species of the Proteaceae in the Cape Floristic Region and came up with the following spectrum (Williams et al., 2005):
  29. 29. In adaptation planning for biodiversity conservation, it is important to know whichspecies are likely to benefit from a particular conservation approach
  30. 30. THE CONCEPT OF CLIMATE REFUGIA The philosophy of the climate refugia is thatvulnerable species in a changing climate can survive and persist in habitats that will remain favourable under climate changeor that they can migrate to the remaining favourable habitats.But with so much habitat fragmentation under way,unless such refugia are in existing protected areas, it will not be easy for such species migrate to safety. Hence the call to expand protected areas or create migration corridors.
  31. 31. In this context, let us go back tothe 1980s when Africa wasdrying up and test the climaterefugia approach to biodiversityconservation.
  32. 32. Distribution of wetter areas in the 1980s and large protected areas . Based on Nicholson (2001) and WCMC (1997)
  33. 33. To expand protected areas to include thefavourable habitats in a skeptical socio-politicalenvironment will be a feat of Nobel Prize winningproportion.And yet, these are the challenges thatconservationists will have to deal with.This also calls for the intensification of conservationefforts within the existing protected areas that willsupposedly remain favourable in the light ofclimate change.
  34. 34. This means that where adaptation isfailing due to the intensification ofclimate changeWe should resort to higher levelconservation strategies.
  35. 35. The Resilience-Accommodation-Transformation Axis of Conservation
  36. 36. The three successive levels of conservation effort:Adaptation: natural or aided leading to resilienceAccommodation: Don’t fight it if you cannot win; workwithin the changed climatic circumstancesTransformation: Make the habitat suitable. For example,erect barriers to protect mangroves from completesubmergence due to sea level rise. Or transfer waterfrom wetter areas to drier areas to save mesic species.But be aware that costs, risks and uncertainties increasealong the this conservation axis: from adaptation toaccommodation to transformation.But if we have to bail-out the biodiversity in distress, wewill have to take these risks.
  37. 37. If Noah savedbiodiversity in his Ark;Why can’t the modernworld do it?
  38. 38. Finally let me attempt to answer thequestion:Is forest conservation possible underclimate change scenarios?I think to a large extent, Yes!But it will take more good research,better policies and better conservationpractices and perhaps the mostdifficult link in all this, more humanand financial resources.
  39. 39. I thank youAsante sana