ZA082
Verlorenvlei Estuary


IBA Criteria

Year of most recent IBA criteria assessment: 1998

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
South African Shelduck Tadorna cana LC non-breeding - 288-470 individuals A4i
Cape Shoveler Spatula smithii LC non-breeding - 103-600 individuals A4i
Great Crested Grebe Podiceps cristatus LC resident - 5-20 breeding pairs A4i
Great Crested Grebe Podiceps cristatus LC non-breeding - 87-123 individuals A4i
Pied Avocet Recurvirostra avosetta LC non-breeding - 78-452 individuals A4i
Hartlaub's Gull Larus hartlaubii LC non-breeding - 209-377 individuals A4i

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here


IBA Monitoring

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2012 high very unfavourable low
Was the whole site covered? Yes State assessed by Habitat
Accuracy of information medium

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Agricultural expansion and intensification annual & perennial non-timber crops - agro-industry farming happening now some of area/population (10-49%) moderate to rapid deterioration high
Agricultural expansion and intensification annual & perennial non-timber crops - shifting agriculture happening now small area/few individuals (<10%) slow but significant deterioration low
Agricultural expansion and intensification annual & perennial non-timber crops - small-holder farming likely in long term (beyond 4 years) small area/few individuals (<10%) slow but significant deterioration low
Agricultural expansion and intensification livestock farming and ranching (includes forest grazing) - nomadic grazing happening now some of area/population (10-49%) slow but significant deterioration medium
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%) moderate to rapid deterioration high
Biological resource use fishing & harvesting aquatic resources - unintentional effects: subsistence/small scale happening now some of area/population (10-49%) moderate to rapid deterioration high
Biological resource use gathering terrestrial plants - unintentional effects (species being assessed is not the target) likely in short term (within 4 years) majority/most of area/population (50-90%) moderate to rapid deterioration high
Climate change and severe weather drought happening now majority/most of area/population (50-90%) moderate to rapid deterioration high
Climate change and severe weather habitat shifting and alteration likely in short term (within 4 years) some of area/population (10-49%) slow but significant deterioration medium
Energy production and mining renewable energy likely in long term (beyond 4 years) some of area/population (10-49%) slow but significant deterioration medium
Human intrusions and disturbance recreational activities likely in short term (within 4 years) majority/most of area/population (50-90%) moderate to rapid deterioration high
Human intrusions and disturbance work and other activities likely in long term (beyond 4 years) 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 likely in short term (within 4 years) some of area/population (10-49%) moderate to rapid deterioration medium
Natural system modifications fire & fire suppression - increase in fire frequency/intensity happening now majority/most of area/population (50-90%) moderate to rapid deterioration high
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 some of area/population (10-49%) slow but significant deterioration medium
Pollution agricultural & forestry effluents - nutrient loads happening now majority/most of area/population (50-90%) moderate to rapid deterioration high
Pollution domestic & urban waste water - type unknown/unrecorded likely in short term (within 4 years) some of area/population (10-49%) slow but significant deterioration medium
Pollution excess energy - light pollution happening now some of area/population (10-49%) slow but significant deterioration medium
Pollution excess energy - noise pollution happening now majority/most of area/population (50-90%) moderate to rapid deterioration high
Pollution garbage & solid waste likely in short term (within 4 years) some of area/population (10-49%) slow but significant deterioration medium
Residential and commercial development commercial and industrial development likely in short term (within 4 years) small area/few individuals (<10%) moderate to rapid deterioration low
Residential and commercial development housing and urban areas happening now majority/most of area/population (50-90%) moderate to rapid deterioration high
Residential and commercial development tourism and recreation areas happening now majority/most of area/population (50-90%) slow but significant deterioration high
Transportation and service corridors flight paths happening now small area/few individuals (<10%) no or imperceptible deterioration low
Transportation and service corridors roads and railroads happening now some of area/population (10-49%) moderate to rapid deterioration high
Transportation and service corridors utility & service lines happening now some of area/population (10-49%) moderate to rapid deterioration high

Condition of habitat (state)
Habitat Habitat Detail Reference Area (ha) Actual Area (ha) % of habitat remaining % of carrying capacity (overall) Result
Shrubland Shrubland - Cape (fynbos) 0 0 poor (40-69%) poor (40-69%) very unfavourable
Wetlands (inland) Estuarine waters 0 0 moderate (70-90%) poor (40-69%) very unfavourable
Wetlands (inland) Saline lakes 0 0 moderate (70-90%) poor (40-69%) very unfavourable

Condition of key/trigger populations (state)
Scientific Common TargetPop ActualPop Units Remaining Result
Alopochen aegyptiaca Egyptian Goose 2014 2014 individuals 100 favourable
Tadorna cana South African Shelduck 470 489 individuals 100 favourable
Spatula smithii Cape Shoveler 600 615 individuals 100 favourable
Podiceps cristatus Great Crested Grebe 123 140 individuals 100 favourable
Pelecanus onocrotalus Great White Pelican 478 478 individuals 100 favourable
Recurvirostra avosetta Pied Avocet 452 1256 individuals 100 favourable
Larus hartlaubii Hartlaub's Gull 377 377 individuals 100 favourable
Hydroprogne caspia Caspian Tern 31 34 individuals 100 favourable
Circus ranivorus African Marsh-harrier 30 9 individuals 30 very unfavourable

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Some of site covered (10-49%) A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species Some limited conservation initiatives are in place low
For more information about IBA monitoring please click here

IBA Protection

Protection status:

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Verlorenvlei Ramsar Site, Wetland of International Importance 1,500 protected area contained by site 1,500

Local conservation groups

The local conservation groups below are working to support conservation at this IBA.

Name Year formed
Elands Bay environmental group. 0
For more information on BirdLife's work with Local conservation groups please click here.

Habitats

IUCN Habitat Habitat detail Extent (% of site)
Wetlands (inland) Estuarine waters, Saline lakes -
Shrubland Shrubland - Cape (fynbos) -
For further information about the habitat classification please click here.

Land use

Land-use Extent (% of site)
agriculture -
tourism/recreation -
For further information about the land use classification please click here.


Recommended citation
BirdLife International (2019) Important Bird Areas factsheet: Verlorenvlei Estuary. Downloaded from http://www.birdlife.org on 18/10/2019.