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Weaver Wednesday 3 [251] - Range changes [14]: Southern Masked Weaver

2017-04-05 (775)

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

Southern Masked Weaver Ploceus velatus

Southern Masked 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).

Southern Masked Weaver
Southern Masked Weaver,
figure from Birdpix

Range changes in SA

Range change summary
More 4 lists 30 lists
increases n % n %
Decrease 262 19 71 11
Tiny change 503 37 203 34
Increase 598 44 330 55
Total 1363 100 604 100
In South Africa the Southern Masked 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. Western Limpopo Province.
2. Most of Swaziland and southern Mpumalanga.
3. Much of the Western Cape - still increasing after arriving in the province less than a century ago.

Mixed results (increases and decreases):
4. Interior of the Northern Cape - mixed results due to poor coverage - more atlasing needed!

Areas with very large decreases:
5. Southern KwaZulu-Natal - this weaver occurs at a low density here.

Range changes elsewhere

Zimbabwe: increase in Harare due to vegetation and gardens (Brooke 1963a).

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 [251] - Range changes [14]: Southern Masked Weaver (2017-04-05)
Weaver chick movements (2015-05-25)
Weaver Wednesday [146] - Discovery [29]: Southern Masked Weaver (2015-04-01)
PAPER: masked casanova (2014-07-14)
Southern Masked Weaver - near daily 'blog' (2013-11-22)
Development of Southern Masked Weaver chick (2013-11-03)
PAPER: How long does it take a weaver to build a nest? (2013-09-30)
PAPER: Learning and memory in nest building by weavers (2013-08-12)
PHOWN caterpillar from Villiers to Harrismith (2013-07-12)
The GREENest range-change map of all: Southern Masked Weaver (2013-03-21)
PAPER: Moult analyses in R (2013-02-18)
Southern Masked Weaver survey in Pretoria (2012-12-07)
PAPER: Southern Masked Weaver colony notes (2012-12-03)
First PHOWN records from Lesotho (2012-09-29)
Weaver Wednesday [10]: Southern Masked Weaver (2012-08-22)
PHOWN repeats of Namibian Masked Weaver colony (2012-08-16)
PAPER: Nest building in Southern Masked Weavers (2011-08-06)
Weaver chick now 1 year 10 months 12 days old (2011-06-27)
PAPER: Nest morphology in African weaver birds (2009-10-25)