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A case of geographic exclusion in glossina the advance of glossina palpalis palpalis towards brazzaville congo to the detriment of glossina fuscipes quanzensis



A case of geographic exclusion in glossina the advance of glossina palpalis palpalis towards brazzaville congo to the detriment of glossina fuscipes quanzensis



Insect Science & its Application 13(1): 59-67



The line of contact between G. p. palpalis and G. f. quanzensis passes near Brazzaville, at the southern and southwest of the Congolese capital. Observations made between 1948 and 1961 show the advance of G. p. palpalis towards Brazzaville, along the Djoue Valley and the Congo River. Recent captures confirm this spectular advance of G. p. palpalis to the detriment of G. f. quanzensis along the Djoue Valley. Indeed, G. f. quazensis is no longer found in a distance of 20 km where it used to co-exist with G. p. palpalis. Ecological competition food or habitat thus occurs between these two closely related species. It is suggested that both heterospecific copulations and demographic pressure play a crucial part in the exclusion.

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