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Termites diversity along a gradient of land use in a tropical forest margin, oume, mid wast côte d’ivoire
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Termites diversity along a gradient of land use in a tropical forest margin, oume, mid wast côte d’ivoire

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  • 1. TERMITES DIVERSITY ALONG A GRADIENT OF LAND USE IN A TROPICAL FOREST MARGIN, OUME, MID-WAST CÔTE D’IVOIRE Souleymane Konaté 1,*, Tra‐Bi Crauland S. 2, Adja Nahoule Armand 2, Pascal K.T. Angui 1, Jérôme E. Tondoh 1,3, Y. Tano 2 (1) Université d’Abobo‐Adjamé, 02 BP 801 Abidjan 02, Côte d’Ivoire; (2) Université de Cocody, 22 BP 582 Abidjan 22, Côte d’Ivoire (3) AfSIS Project, CIAT‐TSBF, IER Sotuba, BP 262, Bamako, Mali;  (1) *Correspondence: skonate@uabobo.ci INTRODUCTION In tropical areas, climatic changes, human activities and uncontrolled land use exert a strong pressure on the ecosystem, leading to habitat structure modification and a decrease in biodiversity. This modification This is known to affect considerably animal communities, particularly that of arthropods. Termites, as a conspicuous feature of tropical ecosystems, represent a key component of soil fauna and are considered as true ecosystem engineers, as well as valuable bio-indicators of tropical biodiversity changes. These organisms play, in many respects, a key role in ecosystems functioning . The study aims to assess termite diversity, along land use intensification gradient under different agroecosystems in mid-west Côte d’Ivoire . STUDY AREA AND METHODS DISTRIBUTION MAP OF STUDY SITES (LAND USE TYPES) RAPID ASSESSMENT OF TERMITE DIVERSITY Sampling method follows a standardized protocol, along a transect (50m x2m, subdivided into 10 sections of 10 m² each) and a TSBF monolith (25cmx25cmx30cm). LEGEND TSBF In each section: Monolith 50m SS SS SS SS SS SS 10m SS SS SS SS SS SS 5m 2m Layout of the sampling site : a grid of 4 km² , including different land use types RESULTS TERMITE SPECIES RICHNESS CLUSTER ANALYSIS BASED ON TERMITE DIVERSITY 30 SPECIES COMPOSITION 3.5 a 25 This study suggested, as previously, three groups: 3 S ecies rich ess Indice de Sha nno n b 20 2.5 n - First group: fallow, primary forest 2 15 c CP T K OO - Second group: TK00, SF, TK94, RPS 1.5 10 T K 94 - Third group: Annual cropland 1 CP TKOO TK94 J p J A CHE RE 5 FSB FSB FP CV RPS 0.5 FP Single Linkage Euclidean distances CV 0 0 RP S 1 4 7 10 13 16 19 22 25 28 31 34 37 40 CP 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 S am pl e s TKOO Samples Values with same letters (a, b) are not significantly different at p<0.05 level SF (Kruskal Walis test) TK94 - The highest number of species was found under fallow fields (27), -With 2.86 and 2.83 Shannon indices, respectively, RPS primary forest (25) FALLOW the primary forest and the fallow fields - Annual crops land, with 16 species, was poorer than all PF were the most diversified habitats other habitats AC - The value corresponding to the most degraded - Habitats subject to a moderate land use intensification (TK00, 0 5 10 15 20 25 30 35 40 habitat (annual crops land) was 2.04. TK94, RPS,SF and perennial crops) showed intermediate species Linkage Distance richness CONCLUSION (1) Termite diversity decreased with increasing land use intensification in the mid-West Côte d’Ivoire. The study showed that forests areas could be good niches for biodiversity conservation if land is well managed. (2) The analysis of functional structure revealed two functional groups of termites, as potential bio-indicators of land use changes. Fungus growing termites showed a good adaptability to disturbed areas, whereas humivorous groups, are characteristic of undisturbed habitats (e.g. primary forest and fallow fields).

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