An expedition, followed up by some computer hunting on Google Earth, has discovered large remnants of old growth forest, including thriving bird communities, in the mountains of Angola. The Namba Mountains in Angola were expected to contain around 100 hectares of forest, but an on-the-ground survey, coupled with online research, has discovered numerous forest fragments totaling around 590 hectares in the remote mountains, boosting the chances for many rare species.
“Afromontane forest is the most localized and threatened habitat type in Angola. For the past 40 years the estimate of the area covered by this habitat in Angola has been circa 200 hectares,” the scientists write in a new paper in Bird Conservation International, but the new discovery nearly quadruples the amount of mountain forest left in Angola to 700 hectares.
Over four days surveying an 100-hectare forest in the Namba Mountains, the researchers recorded 89 bird species, and even more importantly sighted all 20 species that are generally associated with dwindling Angolan mountain forests. The scientists even found an abundant population of Swierstra’s francolin (Pternistis swierstrai), which is listed as Endangered by the IUCN Red List and is only found in Angola. The scientists also recorded the Angola cave chat (Xenocopsychus ansorgei), listed as Near Threatened.
“This makes the Nambas the most important site for Afromontane forest bird conservation in Angola. The Nambas deserve national and international recognition for their conservation importance, and along with [Mount Moco]] are among the highest priorities for the establishment of new conservation areas in Angola,” the researchers write. Mount Moco contains around 85 hectares of forest, thought to be the largest such forest in Angola until this new discovery of larger and, the scientists report, more intact forests.
The researchers recommend that officials quickly list the Nambas Mountains’ as an Important Bird Area (IBA) due to the presence of endangered species as well as a number of species with restricted habitat.
“Further field surveys are required to establish the population sizes of key bird taxa, especially for Swierstra’s Francolin, and the overall bird diversity, and to determine the importance of the area for the conservation of other taxonomic groups,” the researchers conclude.