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Weaver Wednesday 3 [261] - Range changes [24]: Long-tailed Widowbird

2017-06-14 (785)

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

Long-tailed Widowbird Euplectes progne

Long-tailed Widowbird, 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).

Long-tailed Widowbird
Long-tailed Widowbird,
figure from Birdpix

Range changes in SA

Range change summary
More 4 lists 30 lists
increases n % n %
Decrease 270 36 124 37
Tiny change 237 32 119 36
Increase 232 32 91 27
Total 739 100 334 100
In South Africa the Long-tailed Widowbird 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 increases include:
1. Central highveld.

Areas with very large decreases include:
2. Many edges of its range in South Africa show decreases, especially KwaZulu-Natal.
3. Humansdorp area - a small population persists - it has been present historically, and initially must have been joined to the rest of the South African population.

Range changes elsewhere

None known.