Abstract
Dipteran flies play significant role in disease transmission to human, domestic and wild animals. The distribution and diversity of dipteran flies of medical and veterinary importance in Old Oyo national park and its significant importance were assessed in relation to altitude and ecology. Twelve Nzi traps were set at 50 m equidistance to capture dipteran flies between February and August 2019. A total of 1529 dipteran flies belonging to five families were captured. More dipteran flies (64.9%) were trapped during the dry season than wet season (35.1%) (X2 = 270.8; P < 0.0001; OR = 3.41). Of the total flies caught, 289 representing 18.9% were identified as haematophagus flies. Differences in the total haematophagus fly 2 abundance was not significant across the altitudinal levels (X2 = 0.432; P = 0.511; OR = 1.13). The relative apparent density (RAD) of 0.47, 0.22, 0.13, 0.09, 0.07 and 0.03 (flies/trap/day) was observed in Glossina, Hippobosca, Tabanus, Haematopota, Chrysops, Ancala and, respectively. The diversity index of 0.55 and 0.76 were determined for Glossina spp. and Tabanids respectively. The non-blood sucking flies in order of abundance are Musca domestica (43.6%), Fanniacanicularis (41.9%), Chrysomyia bezziana (8.9%), Lucilia sericata (5.6%). If the value-chain of ecotourism is to be promoted in the park, vector-borne arthropods need to be controlled through the use of integrated methods.
 Keywords: Ecological survey, haematophagus flies, Old Oyo national Park, RAD
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