Weaver Wednesday 3: range changes in S Africa
Thick-billed Weaver Amblyospiza albifrons
Range changes in SA
Range change summary
In South Africa the Thick-billed Weaver has many more grid cells with increases in reporting rate than cells showing decreases, between SABAP1 (1987-1991) and SABAP2 (2007-).
The points below match the points on the map above.
Areas with very large increases include:
1. Gauteng and surrounding areas - first reported here in 1961, increased over many decades in urban Gauteng, and in recent years expanding further outwards.
2. Expanding westwards in interior KwaZulu-Natal.
3. Western parts of the Eastern Cape.
Areas with very large decreases:
4. Some decreases along the Mozambique border - this weaver occurs at a lower density here.
Range changes elsewhere
Zimbabwe: increase in Harare, expanding from east (Baker 2011b).