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Studies on Some Physicochemical Factors Affecting the Breeding and Abundance of Mosquitoes (Diptera: Culicidae) in Phytotelmata on Delonix regia (Leguminosae: Caesalpinoidea)

Author(s): D.A. Adebote | D.S. Abolude | S.J. Oniye | O.S. Wayas

Journal: Journal of Biological Sciences
ISSN 1727-3048

Volume: 8;
Issue: 8;
Start page: 1304;
Date: 2008;
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Keywords: Physicochemical factors | mosquitoes | phytotelmata | Delonix regia

Some physical (depth, electrical conductivity, height, surface area, temperature, volume) and chemical (pH, total dissolved solids, concentrations of cadmium, calcium, chlorine, copper, magnesium, sodium, sulphate, zinc) factors affecting the breeding and abundance of preimaginal mosquitoes in phytotelmata on the flamboyant tree, Delonix regia were investigated in Zaria, northern Nigeria. Forty-nine (43.36%) of the 113 stands of the tree had phytotelmata while 28 (24.78%) supported mosquito breeding. Of the 541 mosquito preimaginals isolated from phytotelmata were 5 (0.92%) Aedes aegypti Linnaeus, 126 (23.29%) Aedes metallicus Edwards, 3 (0.55%) Aedes simpsoni Theobald, 79 (14.60%) Culex horridus Edwards, 272 (50.28%) Culex nebulosus Theobald, 52 (9.61%) Culex pipiens pipiens Linnaeus and 4 (0.74%) Culex tigripes Grandpre. Conspecific, congeneric, heterospecific and heterogeneric breeding behavioural patterns were observed with one, two, three and four mosquito species per phytotelma on 13 (46.43%), 11 (39.29%), 2 (7.14%) and 2 (7.14%) trees, respectively. Aedes genus of mosquitoes bred in phytotelmata at significantly lower heights and smaller water volumes than Culex genus (p0.05). Abundance of each of the seven species of mosquito correlated positively and highly significantly with water volumes in the phytotelmata (p = 0.0016; r = 0.435). Culex horridus population correlates positively and highly significantly with the concentration of cadmium (p
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