ZA094
Overberg Wheatbelt


IBA Justification

The site was identified as important in 1998 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species'):
Species Current IUCN Red List Category Season Year(s) Population estimate at site IBA criteria met
Cape Francolin Pternistis capensis LC resident 1998 present A3
Blue Crane Anthropoides paradiseus VU non-breeding - 2,914-3,484 individuals A1, A4i
Black Harrier Circus maurus EN resident - present A1
Cape Long-billed Lark Certhilauda curvirostris LC resident 1998 present A3
Cape Bulbul Pycnonotus capensis LC resident 1998 present A3
Cape Sugarbird Promerops cafer LC resident 1998 present A2, A3
Orange-breasted Sunbird Anthobaphes violacea LC resident 1998 present A2, A3
Cape Siskin Crithagra totta LC resident 1998 present A2, A3

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (1998).


IBA Conservation

IBA conservation assessment
Year of assessment (most recent) State (condition) Pressure (threat) Response (action)
2013 very unfavourable very high low
Was the whole site assessed? State assessed by Accuracy of information
yes habitat medium

State (condition of the trigger species' populations)
Scientific name Common name Reference population Actual population Units % of population remaining Result
Anthropoides paradiseus Blue Crane 6000 6000 individuals 100 favourable
Neotis denhami Denham's Bustard 195 195 individuals 100 favourable
Gyps coprotheres Cape Vulture 210 210 individuals 100 favourable
Circus maurus Black Harrier 100 100 individuals 100 favourable

State (condition of the trigger species' habitats)
Habitat Habitat detail Reference area (ha) Actual area (ha) Habitat quantity (% remaining) Habitat quality (carrying capacity) Result
Artificial/Terrestrial Arable land 0 0 moderate (70-90%) moderate (70-90%) unfavourable
Shrubland Shrubland - Cape (fynbos) 0 0 very poor (< 40%) poor (40-69%) very unfavourable

Pressure (threats to the trigger species and/or their habitats)
Threat level 1 Threat level 2 Timing Scope Severity Result
Agricultural expansion and intensification annual & perennial non-timber crops - agro-industry farming happening now whole area/population (>90%) moderate to rapid deterioration very high
Agricultural expansion and intensification annual & perennial non-timber crops - shifting agriculture happening now some of area/population (10-49%) slow but significant deterioration medium
Agricultural expansion and intensification livestock farming and ranching (includes forest grazing) - agro-industry grazing, ranching or farmin happening now majority/most of area/population (50-90%) slow but significant deterioration high
Agricultural expansion and intensification livestock farming and ranching (includes forest grazing) - small-holder grazing, ranching or farming happening now some of area/population (10-49%) slow but significant deterioration medium
Biological resource use hunting & collecting terrestrial animals - persecution/control happening now some of area/population (10-49%) slow but significant deterioration medium
Climate change and severe weather drought likely in long term (beyond 4 years) whole area/population (>90%) slow but significant deterioration medium
Climate change and severe weather habitat shifting and alteration likely in long term (beyond 4 years) some of area/population (10-49%) slow but significant deterioration medium
Climate change and severe weather temperature extremes likely in long term (beyond 4 years) whole area/population (>90%) slow but significant deterioration medium
Energy production and mining renewable energy likely in short term (within 4 years) some of area/population (10-49%) slow but significant deterioration medium
Human intrusions and disturbance recreational activities happening now some of area/population (10-49%) no or imperceptible deterioration low
Invasive and other problematic species and genes invasive non-native/alien species/diseases - named species happening now some of area/population (10-49%) slow but significant deterioration medium
Invasive and other problematic species and genes problematic native species/diseases - named species happening now some of area/population (10-49%) slow but significant deterioration medium
Natural system modifications dams & water management/use - abstraction of surface water (agricultural use) happening now some of area/population (10-49%) slow but significant deterioration medium
Natural system modifications fire & fire suppression - increase in fire frequency/intensity happening now some of area/population (10-49%) slow but significant deterioration medium
Natural system modifications other ecosystem modifications happening now some of area/population (10-49%) slow but significant deterioration medium
Pollution agricultural & forestry effluents - herbicides and pesticides happening now majority/most of area/population (50-90%) slow but significant deterioration high
Pollution agricultural & forestry effluents - nutrient loads happening now some of area/population (10-49%) slow but significant deterioration medium
Pollution domestic & urban waste water - type unknown/unrecorded happening now small area/few individuals (<10%) slow but significant deterioration low
Pollution excess energy - noise pollution likely in short term (within 4 years) some of area/population (10-49%) slow but significant deterioration medium
Pollution industrial & military effluents - type unknown/unrecorded happening now small area/few individuals (<10%) slow but significant deterioration low
Residential and commercial development commercial and industrial development happening now some of area/population (10-49%) slow but significant deterioration medium
Residential and commercial development housing and urban areas happening now some of area/population (10-49%) slow but significant deterioration medium
Residential and commercial development tourism and recreation areas happening now some of area/population (10-49%) no or imperceptible deterioration low
Transportation and service corridors roads and railroads happening now small area/few individuals (<10%) slow but significant deterioration low
Transportation and service corridors utility & service lines likely in short term (within 4 years) some of area/population (10-49%) slow but significant deterioration medium

Response (conservation actions taken for the trigger species and/or their habitats)
Protected-area designation Management planning Other conservation action Result
Little/none of site covered (<10%) No management plan exists but the management planning process has begun Some limited conservation initiatives are in place low
For more information about IBA conservation status, please click here

IBA Protection

Protected area (PA) PA designation PA area (ha) Relationship of PA with IBA Overlap of PA with IBA (ha)
Witsand Local Nature Reserve Nature Reserve 8 protected area overlaps with site 0
Werner Frehse Nature Reserve Nature Reserve 166 protected area contained by site 0
Vogelgat Private Nature Reserve Nature Reserve 676 protected area overlaps with site 0
The Lagoon 2 Private Nature Reserve Nature Reserve 39 protected area overlaps with site 0
Ten Einde Private Nature Reserve Nature Reserve 185 protected area contained by site 0
Stilbaai Marine Protected Area Marine Protected Area 3,103 protected area overlaps with site 0
Stilbaai Fynbos Private Nature Reserve Nature Reserve 10 protected area contained by site 0
Skulpiesbaai Local Nature Reserve Nature Reserve 79 protected area contained by site 0
San Sebastian Private Nature Reserve Nature Reserve 457 protected area overlaps with site 0
Salmonsdam Provincial Nature Reserve Nature Reserve 713 protected area is adjacent to site 0
Rhenosterkop Private Nature Reserve Nature Reserve 1,005 protected area contained by site 0
Pauline Bohnen Nature Reserve Nature Reserve 387 protected area is adjacent to site 0
Mosselbankfontein Private Nature Reserve Nature Reserve 246 protected area contained by site 0
Maanschynkop Nature Reserve Nature Reserve 785 protected area overlaps with site 0
Jongensgat Private Nature Reserve Nature Reserve 145 protected area contained by site 0
Heidelberg Nature Reserve Nature Reserve 16 protected area overlaps with site 0
Hasekraal Private Nature Reserve Nature Reserve 2,695 protected area contained by site 0
Hannes Zaaiman Private Nature Reserve Nature Reserve 166 protected area contained by site 0
Groot Dam Private Nature Reserve Nature Reserve 181 protected area overlaps with site 0
Gouritz Cluster Biosphere Reserve UNESCO-MAB Biosphere Reserve 3,189,557 protected area overlaps with site 0
Freshwater Sands Private Nature Reserve Nature Reserve 773 protected area overlaps with site 0
Duivenhoksriviermond Private Nature Reserve Nature Reserve 285 protected area contained by site 0
Duin-'n-See Private Nature Reserve Nature Reserve 862 protected area contained by site 0
De Mond State Forest Ramsar Site, Wetland of International Importance 986 protected area is adjacent to site 0
De Mond Nature Reserve Forest Nature Reserve 928 protected area overlaps with site 0
De Hoop Vlei Ramsar Site, Wetland of International Importance 638 protected area overlaps with site 0
De Hoop Nature Reserve Nature Reserve 33,900 protected area overlaps with site 0
De Hoop Marine Protected Area Marine Protected Area 28,887 protected area is adjacent to site 0
Cape Floral Region Protected Areas World Heritage Site (natural or mixed) 1,094,742 protected area overlaps with site 0
Brian Mansergh Private Nature Reserve Nature Reserve 84 protected area overlaps with site 0
Bosbokstrand Private Nature Reserve Nature Reserve 963 protected area contained by site 0
Bontebok National Park National Park 3,416 protected area contained by site 0
Blombos Private Nature Reserve Nature Reserve 61 protected area overlaps with site 0
Annet Private Nature Reserve Nature Reserve 126 protected area contained by site 0
Agulhas National Park National Park 20,131 protected area overlaps with site 0

Habitats

Habitat (IUCN level 1) Habitat detail Extent (% of site)
Grassland -
Shrubland Shrubland - Cape (fynbos) -
Artificial/Terrestrial Arable land -
For more information about the IUCN Habitat classification, please click here.

Land use

Land-use Extent (% of site)
agriculture -
nature conservation and research -
tourism/recreation -


Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Overberg Wheatbelt. Downloaded from https://datazone.birdlife.org/site/factsheet/overberg-wheatbelt-iba-south-africa on 24/02/2024.