Data Zone
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 Shoveler Spatula smithii | LC | non-breeding | - | 337-506 individuals | A4i |
| Great Crested Grebe Podiceps cristatus | LC | non-breeding | - | 54 individuals | A4i |
| African Oystercatcher Haematopus moquini | LC | non-breeding | - | present | A1 |
| Pied Avocet Recurvirostra avosetta | LC | non-breeding | - | 263-669 individuals | A4i |
| Hartlaub's Gull Larus hartlaubii | LC | breeding | - | 150-375 breeding pairs | A4i |
| Hartlaub's Gull Larus hartlaubii | LC | non-breeding | - | 543-1,102 individuals | A4i |
| Kelp Gull Larus dominicanus | LC | non-breeding | - | 665 individuals | A4i |
The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (1998).
| IBA conservation assessment | |||
|---|---|---|---|
| Year of assessment (most recent) | State (condition) | Pressure (threat) | Response (action) |
| 2013 | not assessed | high | high |
| Was the whole site assessed? | State assessed by | Accuracy of information | |
| yes | unset | medium | |
| State (condition of the trigger species' habitats) | ||||||
|---|---|---|---|---|---|---|
| Habitat | Habitat detail | Reference area (ha) | Actual area (ha) | Habitat quantity (% remaining) | Habitat quality (carrying capacity) | Result |
| Shrubland | Shrubland - Cape (fynbos) | 0 | 0 | poor (40-69%) | poor (40-69%) | very unfavourable |
| Wetlands (inland) | 0 | 0 | moderate (70-90%) | moderate (70-90%) | 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 - small-holder farming | happening now | small area/few individuals (<10%) | slow but significant deterioration | low |
| Biological resource use | fishing & harvesting aquatic resources - unintentional effects: subsistence/small scale | happening now | small area/few individuals (<10%) | no or imperceptible deterioration | low |
| Biological resource use | gathering terrestrial plants - unintentional effects (species being assessed is not the target) | happening now | small area/few individuals (<10%) | no or imperceptible deterioration | low |
| Biological resource use | hunting & collecting terrestrial animals - unintentional effects (species is not the target) | happening now | small area/few individuals (<10%) | no or imperceptible deterioration | low |
| Climate change and severe weather | drought | likely in long term (beyond 4 years) | whole area/population (>90%) | moderate to rapid deterioration | high |
| Climate change and severe weather | habitat shifting and alteration | happening now | majority/most of area/population (50-90%) | slow but significant deterioration | high |
| Climate change and severe weather | storms and floods | likely in short term (within 4 years) | whole area/population (>90%) | no or imperceptible deterioration | low |
| Climate change and severe weather | temperature extremes | likely in long term (beyond 4 years) | whole area/population (>90%) | moderate to rapid deterioration | high |
| Energy production and mining | mining and quarrying | happening now | small area/few individuals (<10%) | no or imperceptible deterioration | low |
| Human intrusions and disturbance | recreational activities | happening now | some of area/population (10-49%) | slow but significant deterioration | medium |
| Human intrusions and disturbance | work and other activities | happening now | some of area/population (10-49%) | slow but significant deterioration | medium |
| Invasive and other problematic species and genes | introduced genetic material | happening now | small area/few individuals (<10%) | slow but significant 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%) | moderate to rapid deterioration | high |
| Invasive and other problematic species and genes | problematic native species/diseases - named species | happening now | majority/most of area/population (50-90%) | moderate to rapid deterioration | high |
| Natural system modifications | fire & fire suppression - increase in fire frequency/intensity | happening now | small area/few individuals (<10%) | no or imperceptible deterioration | low |
| Natural system modifications | other ecosystem modifications | happening now | majority/most of area/population (50-90%) | no or imperceptible deterioration | low |
| Pollution | agricultural & forestry effluents - nutrient loads | happening now | majority/most of area/population (50-90%) | slow but significant deterioration | high |
| Pollution | agricultural & forestry effluents - soil erosion, sedimentation | happening now | small area/few individuals (<10%) | slow but significant deterioration | low |
| Pollution | air-borne pollutants - smog | happening now | whole area/population (>90%) | slow but significant deterioration | high |
| Pollution | domestic & urban waste water - run-off | happening now | majority/most of area/population (50-90%) | slow but significant deterioration | high |
| Pollution | excess energy - light pollution | happening now | whole area/population (>90%) | slow but significant deterioration | high |
| Pollution | excess energy - noise pollution | happening now | whole area/population (>90%) | slow but significant deterioration | high |
| Pollution | garbage & solid waste | happening now | some of area/population (10-49%) | moderate to rapid deterioration | high |
| Pollution | industrial & military effluents - type unknown/unrecorded | happening now | some of area/population (10-49%) | moderate to rapid deterioration | high |
| 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%) | slow but significant deterioration | medium |
| Transportation and service corridors | flight paths | happening now | some of area/population (10-49%) | slow but significant deterioration | medium |
| Transportation and service corridors | roads and railroads | happening now | some of area/population (10-49%) | slow but significant deterioration | medium |
| Transportation and service corridors | utility & service lines | happening now | 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 |
| Whole area of site (>90%) covered by appropriate conservation designation | A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species | The conservation measures needed for the site are being comprehensively and effectively implemented | high |
| Protected area (PA) | PA designation | PA area (ha) | Relationship of PA with IBA | Overlap of PA with IBA (ha) |
|---|---|---|---|---|
| Rietvlei Nature Area | Nature Reserve | 549 | protected area overlaps with site | 527 |
| Cape West Coast Biosphere Reserve | UNESCO-MAB Biosphere Reserve | 386,161 | protected area overlaps with site | 0 |
| Habitat (IUCN level 1) | Habitat detail | Extent (% of site) |
|---|---|---|
| Shrubland | Shrubland - Cape (fynbos) | - |
| Marine Coastal/Supratidal | - | |
| Marine Neritic | - | |
| Marine Intertidal | - |
| Land-use | Extent (% of site) |
|---|---|
| tourism/recreation | - |
| nature conservation and research | - |
Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Rietvlei Wetland: Table Bay Nature Reserve. Downloaded from
http://datazone.birdlife.org/site/factsheet/rietvlei-wetland:-table-bay-nature-reserve-iba-south-africa on 09/12/2023.
