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Diversity and distribution of birds in a Congo Basin wetland: the upstream part of the Nyong River valley in Cameroon along two regions (Centre and East)

International Journal of Avian & Wildlife Biology
Esther Diane Olivia Azang,1 Billy Nguembock,1,2 Sali Mahamat,1 Paulin Tadjoung,4 Anthony Gilchrist Kendeg Kendeg,1 Joseph Lebel Tamesse3


Several studies have recently been carried out on the avifauna of Cameroon and have
made it possible to update the data for certain regions; however, no recent study has been
carried out on the upper valley of the Nyong River, which is a wetland, and therefore the
data remains quite old. We carried out a study on the avifauna of this valley and birds
were sampled over a period of one year using the mist-netting method. The collected data
were analyzed using PAST bio statistical software for the diversity and distribution of the
avifauna. A total of 268 individuals belonging to 69 bird species were captured, with a
high proportion of passerines (73%) compared with non-passerines. The high diversity of
the avifauna is supported by estimated values of diversity indexes which show an absence
of supremacy of one species (H’=3.64) and an equal distribution of individuals in their
environment (J’=0.86). With the value of the Simpson diversity index of 0.96, our result
confirms high diversity within the upper valley of the Nyong River avifauna but it also
reveals the abundance of this avifauna. In addition, the Kruskal-Wallis test value of 0.04
showed a significant difference in the distribution of relative abundances of taxa at the
areas investigated and that different could be justified by a difference in the physiognomy
of their vegetation. This study confirms that the composition as well as the structure of the
upper valley of the Nyong River as observed in the field play a main role in the diversity
of bird species due to the presence of feeding, resting and nesting areas. Based on our
distribution and diversity analysis, the pattern of variation in distribution of birds in this
wetland appears to lean on environmental factors and particularly the vegetation, which
played the main role with a mixture of poor and good dispersers, migratory and vagrant due
to presence of lush vegetation all year round


avifauna, upstream valley, Nyong river, wetland, diversity, distribution