Birds of the International Institute of Tropical Agriculture campus, a stronghold of avian diversity in the changing Ibadan area (Nigeria) over the last 50 years
Loading...
Date
2014-07
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Data from a survey carried out between 2009 and 2013 of the bird species in
the International Institute of Tropical Agriculture (IITA) campus, Ibadan, Nigeria,
are compared with records from the area around Ibadan (including IITA) for
the last 50 years. The IITA campus is an Important Bird Area (IBA) and includes
a secondary dry semi-deciduous forest reserve of c. 360 ha, which is fenced
and protected. The forested area is now being extended and enhanced by
planting indigenous trees on degraded farm plots, and by enrichment planting
in degraded areas of forest. In total, 398 bird species from at least 71 families
are now recorded for the Ibadan area, of which 322 species have been recorded
since 2002. The IBA holds at least 269 of these species (68 %) in 64 families,
while the forest reserve holds c. 137 species. Seventy-five species were mistnetted
in the IBA in our study. Twenty-five species plus 13 vagrants are new
to the IBA and the Ibadan area in general, having not been detected prior to
2002. However, a minimum 68 species plus an additional 62 vagrant species
reported in the Ibadan area by earlier studies have not been detected recently.
We report an additional 29 biome-restricted species present in the Ibadan area
(74 had been reported previously), 17 of which occur in the IBA. Diversity of
some groups of large birds (e.g. Anatidae) has declined whereas many forest edge
or generalist species (e.g. Double-spurred Francolin Francolinus bicalcaratus)
have increased in abundance and range. Forest specialists, including many
Pycnonotidae and Bucerotidae species, appear to have declined. The IITA
campus, with its forest reserve, lakes and farm plots, is now an “island” IBA of great avifaunal diversity surrounded by a highly modified anthropogenic
landscape unwelcoming for many of the birds that formerly inhabited the area.