Biomonitoring and Inter-Annual Variation of Soil Mite (Acari) Diversity and Community Structure in Lamto Guinean Savannah (Côte d’Ivoire) Submitted to Different Fire Regimes

  • Dr. NDRI Kouadio Julien Université Nangui Abrogoua
  • Kanvaly Dosso Université Nangui Abrogoua
  • Aya B. N Dri Université Nangui Abrogoua
  • Rodolphe Arnaud G. N Da Université Nangui Abrogoua
  • Mouhamadou Kone Université Peleforo Gon Coulibaly, Côte d’Ivoire
  •  N'Golo A. Kone Université Nangui Abrogoua
  •  Fabrice A. Seka Université Nangui Abrogoua
  • Pacôme K. Pokou Université Nangui Abrogoua
Keywords: Lamto Savannah, Soil Mite Abundance, Diversity and Community Structure, Fire Regimes and Fire Cycles, Inter-Annual Variation


The objective of the study conducted in the Lamto Guinean savannah situated at 165 km northwest of Abidjan, Côte d’Ivoire consisted to assess the changes in soil mite abundance, diversity and community structure specific to the second fire cycle applied in 2015, as well as the inter-annual variation between the two fire cycles (2014 and 2015). Three study sites (Salty marigot, Plateau and North piste) were selected in shrub savannah, where on each, three adjacent stands of 100 m x 50 m formerly delimited were considered. The three fire regimes (early, mid-season, and late fire) were respectively applied on the three sites and stands. Thus, 135 soil cores (5 soil cores × 3 sampling periods × 3 fire regimes or stands × 3 sites) were used for mite extraction. 108 soil cores were taken at two upper layers (0-5 and 5-10 cm) for determination of the bulk density and water content. Whatever the fire regimes, the mean density of soil mites decreased after the fire application. The highest value of density was observed through the early fire (1,715 ± 327 ind.m-2) whereas the lowest value was recorded during the mid season fire (1,433 ± 153 ind.m-2). 41 species had been recorded along the three fire regimes and distributed as follows: early fire 34 species, mid season fire 20 species, and late fire 13 species. The mean species richness of soil mites changed significantly across the fire regimes, and reduced after the fire application, except for the mid season fire. The Simpson diversity index was significantly modified across the fire regimes, and increased after the fire application. Beyond to 24 specialist species, over 50% of the species observed before the burns were rediscovery after the fire application, and could explain this variation. The inter-annual variation of soil mites showed that the density (early fire, mid season fire, and late fire), mite richness (early fire), and diversity (early fire and late fire) increased whereas the mite richness (mid season fire and late fire), and diversity (mid season fire) decreased, respectively, during 2015-burn compared to the previous cycle (2014-burn). The rebound of soil mite parameters during the second fire cycle could be assigned (i) to litter and woody debris, which burn in a mosaic, reflecting local fire intensity, (ii) improving of stand complexity and canopy structure, and (iii) fire tolerance of mites.


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Author Biographies

Dr. NDRI Kouadio Julien, Université Nangui Abrogoua
Ecology and Ecosystem Management UFR-SN / Ecology Research Centre Université Nangui Abrogoua 02 BP 801 Abidjan 02 Côte d'Ivoire, cel +225 07 49 38 08
Kanvaly Dosso, Université Nangui Abrogoua

UFR des Sciences de la Nature, Université Nangui Abrogoua, 02 BP 801 Abidjan 02, Côte d’Ivoire

Aya B. N Dri, Université Nangui Abrogoua

UFR des Sciences de la Nature, Université Nangui Abrogoua, 02 BP 801 Abidjan 02, Côte d’Ivoire

Rodolphe Arnaud G. N Da, Université Nangui Abrogoua

UFR des Sciences de la Nature, Université Nangui Abrogoua, 02 BP 801 Abidjan 02, Côte d’Ivoire

Mouhamadou Kone, Université Peleforo Gon Coulibaly, Côte d’Ivoire

Université Peleforo Gon Coulibaly, Côte d’Ivoire


 N'Golo A. Kone, Université Nangui Abrogoua

UFR des Sciences de la Nature, Université Nangui Abrogoua, 02 BP 801 Abidjan 02, Côte d’Ivoire

 Fabrice A. Seka, Université Nangui Abrogoua

UFR des Sciences de la Nature, Université Nangui Abrogoua, 02 BP 801 Abidjan 02, Côte d’Ivoire

Pacôme K. Pokou, Université Nangui Abrogoua

UFR des Sciences de la Nature, Université Nangui Abrogoua, 02 BP 801 Abidjan 02, Côte d’Ivoire


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