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Weaver Wednesday 3 [243] - Range changes [6]: Spectacled Weaver

2017-02-08 (766)

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

Spectacled Weaver Ploceus ocularis

Spectacled 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	108	22	37	14
Tiny change	116	23	76	28
Increase	266	54	158	58
Total	490	100	271	100

In South Africa the Spectacled Weaver has more grid cells with increases in reporting rate than cells showing decreases, between SABAP1 (1987-1991) and SABAP2 (2007-). Not shown in this map is current SABAP2 distribution which shows that the core of the range of the Spectacled Weaver in South Africa as coastal KwaZulu-Natal; there is good SABAP2 coverage in the Kruger National Park but the Spectacled Weaver occurs at a low reporting rate there.

The points below match the points on the map above.

Areas with very large increases include:
1. Eastern Cape.
2. KwaZulu-Natal.
3a,b,c. The western edge of its range in South Africa (other than the western edge in the Eastern Cape).

Large decreases appear to have occurred:
4. The western edge in the Eastern Cape.

Range changes elsewhere

Equatorial Guinea: at Río Muni, appears to be addition to country list (Demey 2015b).

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 [243] - Range changes [6]: Spectacled Weaver (2017-02-08)
Weaver Wednesday [151] - Discovery [34]: Spectacled Weaver (2015-05-06)
PAPER (ecology): Quill mite in Spectacled Weavers (2015-01-12)
Weaver Wednesday [24]: Spectacled Weaver (2012-11-28)
Story of a Spectacled Weaver nest (2012-01-23)