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A diachronic study on the evolution of the main ecosystems Tassili / Ahaggar cultural parks

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Presented during the 17h Annual Sahelo-Saharan Interest Group Meeting organized by the NGO Sahara Conservation Fund in Senegal, from 4 to 6 May 2017. The Sahara Conservation Fund (SCF) gathers every year about a hundred people who are interested in the field of Sahelo-Saharan species conservation.

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A diachronic study on the evolution of the main ecosystems Tassili / Ahaggar cultural parks

  1. 1. 17th Annual Sahelo-Saharan Interest Group Meeting 2 days of talks on biodiversity conservation in the Sahara and in the Sahel A diachronic study on the evolution of the main ecosystems Tassili / Ahaggar cultural parks Abdenour MOUSSOUNI, Chargé de planification – Projet Parcs Culturels Algériens (PPCA) May 4 – 6, 2017
  2. 2. ‫اﻟدﯾﻣﻘراطﯾﺔ‬ ‫اﻟﺟزاﺋرﯾﺔ‬ ‫اﻟﺟﻣﮭورﯾﺔ‬ ‫اﻟﺷﻌﺑﯾﺔ‬ REPUBLIQUE ALGERIENNE DEMOCRATIQUE ET POPULAIRE Project "Conservation of biodiversity of world interest and sustainable use of ecosystem services in cultural parks in Algeria" Présenté par Mr Abdenour MOUSSOUNI, chargé de la planification (UCG). 17ème Conférence GISS- 4-6 Mai-Saint Louis, Sénégal. A diachronic study on the evolution of the main ecosystems Tassili / Ahaggar cultural parks,
  3. 3. Aim of the project: Ensure the conservation of biodiversity and sustainable exploitation of the different ecosystems services in cultural parks.
  4. 4. Background and objective Tassili n’Ajjer/ Ahaggar cultural parks
  5. 5. Territoire immense Large area Tassili Cultural Park : 138.000 km² Ahaggar Cultural Park : 633.887km²
  6. 6. Saharan climatic conditions would exclude all life if they are homogeneous over the entire surface of the desert. The presence of many microclimates is the key of its rich biodiversity. These microclimates offer a favorable and unique habitat for organisms, animals and plants. Important climatic variation in time and space
  7. 7. Dry environment Fragile ecosystems The Sahara receives an extremely low amount of rain
  8. 8. Low population density Rich living Algerian cultural heritage The cultural heritage in the Algerian Sahara may be viewed as one of the ultimate human adaptation to global warming.
  9. 9. Rich Biodiversity Habitat for world importance species Important area for bird’s conservation The rich biodiversity of the Tassili and Ahaggar cultural parks with their diverse ecosystems services are facing multiple pressures.
  10. 10. Contraints Habitat regression Decrease of vegetation cover Forcing of dray climate and pasture Overexploitation of plants Solutions Poaching Building a biodiversity monitoring system based on network of mobile units for management and supervision. Results The project has contributed to the preservation of the prioritized areas. 1
  11. 11. Incomplete ecosystems inventories Incomplete data analysis Monitoring large area is complex Reduced efficiency for planning, decision-making. 2 Use of satellite remote sensing data to understand the evolution of the different ecosystems in the Tassili Ahaggar cultural parks. Use change detection technique based on remote sensing satellite images to map the evolution of main ecosystems and identify the most important pressure on productive ecosystem services. The ongoing study uses 1984 and 2016 as reference years. Observation Solution
  12. 12. Methodology Bibliography USGS Landsat database Image selection Preprocessing Test and evaluation of different mapping change detection techniques Maps verificationField work No Yes Maps production Evaluation
  13. 13. Step 1: preprocessing Preliminary results Spectral enhancement of vegetation Example showing the performance of the applied approach in the case of a narrow vegetation located in a canyon.
  14. 14. Step 2: land cover classes delimitation Determine the different classes of land use Example of a steppe ecosystem in near the city of Djanet (Tassili park) • The method of thematic classes’ identification is based on an hybrid segmentation/classification approach. • The process is able to delineate the steppe ecosystem accurately.
  15. 15. Analysis of preliminary maps Evolution of vegetation between 1986 and 2016 Case of the Abalessa region
  16. 16. Evolution of vegetation between 1986 and 2016 Case of the town of Tamanrasset
  17. 17. 1986 2016 Evolution of vegetation between 1986 and 2016 Case of the region of Idelès
  18. 18. 1986 2016 The green color shows vegetation growth between 1986 and 2016 Evolution of vegetation between 1986 and 2016 Case of the region of Idelès
  19. 19. Conclusion The preliminary results show that there was an increase of the vegetation between 1986 and 2016. There is a limited impact of the use of productive ecosystem services due to the large area of the two parks. This is also due to the good practice and the know-how of the Algerian population living in these areas. The habitats of the great fauna seem well preserved, Further research need to be under taken to explore the link between these results with global warming.
  20. 20. Results of this study Bibliographic data Base for the identification of sites for the installation of camera traps (50) for cheetah monitoring. Results of anthropological investigations

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