Weaver news

Weaver Wednesday 3 [249] - Range changes [12]: Holub's Golden Weaver

2017-03-22 (772)

gravit8 Weaver Wednesday 3: range changes in S Africa (species text)

Holub's Golden Weaver Ploceus xanthops

Holub's Golden 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).

Holub's Golden Weaver
Holub's Golden Weaver,
figure from Birdpix

Range changes in SA

Range change summary
More 4 lists 30 lists
increases n % n %
Decrease 49 34 34 33
Tiny change 17 12 14 14
Increase 76 53 55 54
Total 142 100 103 100
In South Africa the Holub's Golden 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. Limpopo province.
2. Mpumalanga, centered on Nelspruit (also the core of its range in South Africa).
3. KwaZulu-Natal midlands.

Areas with very large decreases:
On the edges of its range in South Africa, particularly around the areas of high increases in Limpopo (no. 1) and the western edge of the KwaZulu-Natal midlands (no. 3).

Range changes elsewhere

None known.