Changes over twelve years in populations of Glossina pallidipes and Glossina longipennis (Diptera: Glossinidae) subject to varying trapping pressure at Nguruman, south-west Kenya

animal migration caza con trampa glossina glossina pallidipes immigration kenia kenya migration animale modele modelos models mouvement movement movimiento periodicidad periodicity seasonality trampas trapping traps trypanosoma trypanosoma congolense trypanosoma vivax vecteur de maladie vectores vectors