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Weaver Wednesday 3 [256] - Range changes [19]: Yellow Bishop

2017-05-10 (780)

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

Yellow Bishop Euplectes capensis

Yellow Bishop, 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).

Yellow Bishop
Yellow Bishop,
figure from Birdpix

Range changes in SA

Range change summary
More 4 lists 30 lists
decreases n % n %
Decrease 209 42 129 40
Tiny change 135 27 106 34
Increase 159 32 85 27
Total 503 100 320 100
In South Africa the Yellow 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. Limpopo Province - slight range expansion northwards.
2. Interior of the Eastern Cape - range expansion westwards.

Areas with very large decreases include:
3. Southern Mpumalanga and northern KwaZulu-Natal - occurs at low reporting rate and decreasing.

Areas with very small changes include:
4. The Yellow Bishop occurs at a relatively high density in much of the Western Cape and this population appears to be stable, i.e. shows mostly small increases (light green) or small decreases (yellow).

Range changes elsewhere

Mozambique - new records from far north coast (SAFRING database).