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Weaver Wednesday 3 [252] - Range changes [15]: Thick-billed Weaver

2017-04-12 (776)

Weaver Wednesday 3: range changes in S Africa (species text)

Thick-billed Weaver Amblyospiza albifrons

Thick-billed Weaver, Range-change map between SABAP1 (1987-1991) and SABAP2 (2007-current).
Red, orange and yellow = cells with very large, large, and small relative decreases
Blue, dark green and light green = cells with very large, large and small relative increases.
Cells = quarter-degree grid cells; Only cells with at least 4 checklists in both SABAP1&2 shown. All cells had this species recorded in SABAP1 or in SABAP2 or in both (more about interpretation at Biodiversity Observations 7.62: 1-13).

Range changes in SA

Range change summary
More	4 lists		30 lists
increases	n	%	n	%
Decrease	91	22	32	11
Tiny change	71	16	50	18
Increase	270	62	194	71
Total	432	100	276	100

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).

All news items relating to this species

The headers below refer to Weaver News items featuring this species. Click on a header to see the News item, which includes the full news item. (The number in brackets is the date that the news item appeared on Weaver Watch).

Weaver Wednesday 3 [252] - Range changes [15]: Thick-billed Weaver (2017-04-12)
Weaver Wednesday [153] - Discovery [36]: Thick-billed Weaver (2015-05-20)
PAPER: Thick-billed Weaver and Cuckoo Finch related (2013-05-13)
Weaver Wednesday [8]: Thick-billed Weaver (2012-08-08)
Tracking PHOWN priorities (2012-02-28)
Thick-billed Weaver movement (2012-01-20)
Oldest Thick-billed Weaver (2011-06-15)
Thick-billed Weaver range expansion (2011-04-04)