Avian diversity and abundance in Finima Nature Park, Bonny Island, Rivers State, Nigeria

Abstract

Bird species indices for monitoring population trends and bird species habitat association in the Finima Nature Park (FNP) were assessed using line transect method. Nine transects of 2 km each, at an independent distance of 0.02 km were used for the study. Transects were surveyed over five days between 0600hrs and 1200hrs; 1400hrs and 1600hrs and opportunistically at night. All birds sighted or heard were recorded and identified to species with the aid of Helms field guide to birds of western Africa and collection of African bird calls. Bird species abundance, richness, diversity, evenness, and Sorenson’s index of similarity were deduced. A total of 1479 individuals belonging to 93 species and classified into 35 families were recorded. Pluvialis squatarola (20.89%) and Sternula balaenarum (13.52%) were the highest occurring birds. Ardeidae (9) and Scolopacidae (8) had the highest numbers of species represented at FNP. Among the birds sighted in the study, Necrosyrtes monachus is found to be Critically Endangered (CR); Sternula balaenarum to be Vulnerable (VU); and Numenius arquata is Near Threatened (NT). A periodic appraisal and protections for the migrant, resident birds, and their habitats is recommended.