The weaver bird family

There are 117 living species in the weaver bird family (Ploceidae), excluding the sparrows of genus Passer, see species list here. Read more about the family here.

Latest Weaver Wednesday
Yellow-crowned Bishop

PHOWN:
Accepted: 26781
(Uploaded: 26782)

Total nests counted: 8083370

Latest weaver links:
132 Red-collared Widowbird - non-breeding
131 Thick-billed Weaver flocks
130 Yellow Weaver and Diderick Cuckoo

Todays weaver type: (see more here)
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Latest weaver news

Weaver Wednesday 3 [257] - Range changes [20]: Yellow-crowned Bishop

2017-05-17 (781)

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

Yellow-crowned Bishop Euplectes afer

map
Yellow-crowned 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-crowned Bishop
Yellow-crowned Bishop,
figure from Birdpix

Range changes in SA

Range change summary
More 4 lists 30 lists
decreases n % n %
Decrease 316 45 130 42
Tiny change 165 23 82 26
Increase 220 31 100 32
Total 701 100 312 100
In South Africa the Yellow-crowned 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. Western Free State extending into the Northern Cape.
2. Western part of the Eastern Cape - range expansion westwards towards Beaufort West.
3. Swaziland and northern KwaZulu-Natal - new out of range records.

Areas with very large decreases include:
4. Most of Limpopo Province.
5. Southern KwaZulu-Natal and most of the Eastern Cape.

The greatest changes appear on the edges of its range. This is not too surprising as this species is somewhat nomadic, depending on ephemeral wetlands.

Range changes elsewhere

Zimbabwe: movements in relation to dry conditions (Baker 2012b).

Exotic populations established in foreign countries, especially Spain and Portugal, also Hawaii, Jamaica, Japan, Puerto Rico: Appendix of Dyer EE, Redding DW, Blackburn TM. 2017. The global avian invasions atlas, a database of alien bird distributions worldwide. Nature Scientific Data 4 no: 170041.

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

map
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).

Weaver Wednesday 3 [255] - Range changes [18]: Southern Red Bishop

2017-05-03 (779)

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

Southern Red Bishop Euplectes orix

map
Southern Red 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).

Southern Red Bishop
Southern Red Bishop,
figure from Birdpix

Range changes in SA

Range change summary
More 4 lists 30 lists
increases n % n %
Decrease 431 29 144 23
Tiny change 427 29 215 36
Increase 642 43 253 41
Total 1500 100 612 100
In South Africa the Southern Red Bishop has 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. Gauteng, north-eastern Free State, and southern Mpumalanga.
2. Central and southern Free State.

Areas with very large decreases include:
3. Most of Limpopo Province.
4. Central North-west Province.

Many areas in South Africa show a checkered pattern, suggesting small changes (ie stable populations).

Range changes elsewhere

Exotic populations established in foreign countries, eg United Arab Emirates, Australia: Appendix of Dyer EE, Redding DW, Blackburn TM. 2017. The global avian invasions atlas, a database of alien bird distributions worldwide. Nature Scientific Data 4 no: 170041.

Weaver Wednesday 3 [254] - Range changes [17]: Red-headed Quelea

2017-04-26 (778)

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

Red-headed Quelea Quelea erythrops

map
Red-headed Quelea, 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).

Red-headed Quelea
Red-headed Quelea,
figure from Birdpix

Range changes in SA

Range change summary
More 4 lists 30 lists
increases n % n %
Decrease 11 18 10 18
Tiny change 2 4 2 4
Increase 49 79 43 78
Total 62 100 55 100
In South Africa the Red-headed Quelea 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. Along the eastern coast of South Africa.

Areas with very large decreases include:
2. The interior edge of its range in KwaZulu-Natal.

The Red-headed Quelea occurs at a low density in southern Africa. During SABAP1 the Red-headed Quelea was not recorded in the Eastern Cape, but there had been many records prior to SABAP1.

Range changes elsewhere

Botswana: new arrival (Tyler 2008a).
Chad: seen near Mongo, unusually far north (Demey 2015b).

Weaver Wednesday 3 [253] - Range changes [16]: Red-billed Quelea

2017-04-19 (777)

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

Red-billed Quelea Quelea quelea

map
Red-billed Quelea, 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).

Red-billed Quelea
Red-billed Quelea,
figure from Birdpix

Range changes in SA

Range change summary
More 4 lists 30 lists
increases n % n %
Decrease 200 15 51 9
Tiny change 221 16 102 20
Increase 929 69 372 71
Total 1350 100 525 100
In South Africa the Red-billed Quelea 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. Free State to southern KwaZulu-Natal.
2. Western part of the Eastern Cape.
3. Most of the Western Cape - this is a range expansion in recent decades.

Mixed results (increases and decreases):
4. Limpopo Province
5. North-West Province and the Northern Cape - mixed results due to poor coverage - more atlasing needed!

6. Lesotho - occurs at low density; SABAP2 coverage too low for meaningful results.

Range changes elsewhere

Exotic populations established in foreign countries, eg Spain, Oman, Reunion: Appendix of Dyer EE, Redding DW, Blackburn TM. 2017. The global avian invasions atlas, a database of alien bird distributions worldwide. Nature Scientific Data 4 no: 170041.
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