Weaver Wednesday 3: range changes in S Africa
Yellow-crowned Bishop Euplectes afer
Range changes in SA
Range change summary
In South Africa the Yellow-crowned Bishop has more grid cells with decreases in reporting rate than cells showing increases, between SABAP1 (1987-1991) and SABAP2 (2007-).
The points below match the points on the map above.
Areas with very large increases include:
1. Western Free State extending into the Northern Cape.
2. Western part of the Eastern Cape - range expansion westwards towards Beaufort West.
3. Swaziland and northern KwaZulu-Natal - new out of range records.
Areas with very large decreases include:
4. Most of Limpopo Province.
5. Southern KwaZulu-Natal and most of the Eastern Cape.
The greatest changes appear on the edges of its range. This is not too surprising as this species is somewhat nomadic, depending on ephemeral wetlands.
Range changes elsewhere
Zimbabwe: movements in relation to dry conditions (Baker 2012b).
Exotic populations established in foreign countries, especially Spain and Portugal, also Hawaii, Jamaica, Japan, Puerto Rico: Appendix of Dyer EE, Redding DW, Blackburn TM. 2017. The global avian invasions atlas, a database of alien bird distributions worldwide. Nature Scientific Data 4 no: 170041.