Intra-colonial Population of Macrotermes bellicosus (Smeathman) [Isoptera: Termitidae] in Sokoto, Semi-Arid Zone of North-Western Nigeria

The intra- colonial population of individuals within the mounds of mound- building termite, Macrotermes bellicosus (Smeathman) occurring in some selected Local Government Areas of Sokoto State were studied. A total of 72 cone shaped mounds were selected based on their heights. Populationswere estimated by randomly collecting and counting core samples from the mounds using a small bucket as the mounds were being excavated. At the end of the excavation, the total sand removed from the mound was crushed and measured using the same bucket. Total number of termites from a mound was extrapolated from the above estimates. Results indicate the presence of five different castes; reproductives, workers, minor and major soldiers and nymphs. The population of individuals per moundapart from the reproductives, ranged between 14158.00 and 24777.67 with an average of 18,795.49 termites per mound. The nymphs were the largest (5,942.60) closely followed by the workers (5,547.70), while the minor soldiers are the least with 3,279.38. Significant difference (p<0.05) occurred between minor soldiers and nymphs, major soldiers and nymphs, minor soldiers and workers and minor soldiers and nymphs in some of the studied areas. The present study show M. bellicosus to have high population within individual mounds enough to cause damage if ignored. Being a pestiferous species that could promote erosion, appropriate control strategies are required for its control.Key words: Macrotermes bellicosus, Mounds- building termites, intra-colonial Population, Mounds, Castes

Anopheles gambiae in Sokoto, north-western Nigeria

Members of the Anopheles gambiae are complex, morphologically indistinguishable and are also amongst the most important malaria vectors in the world. Being able to distinguish them and their behavioural characteristics could lead to formulation of tailor-made vector controlmeasures. This research was undertaken to identify themalaria vectors in Sokoto metropolis, north western Nigeria. Mosquitoes were collected indoors weekly within the township between the months of March 2005 and February 2006 in six randomly selected sites and were assessed using a molecular biological technique which is polymerase chain reaction (PCR). Anopheles gambiae was identified as one of the malaria vectors present in Sokoto, Nigeria