Parent Layer: Plant Species Theme

Name: Plant Species

Display Field: SENSITIVIT

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: Summary This dataset contains a combined set of known and predicted (modelled) distributions for threatened plant species in South Africa, as well as a selected group of currently non-threatened species that have distribution ranges smaller than 10 km². The intention of the dataset is to guide botanical specialists in terms of which species to specifically look for in a site assessment as per the requirements of Screening Tool protocols for Environmental Authorisation. Description The dataset contains distribution maps for plant species in three different classes, as indicated in the attribute field SENSITIVIT. SENSITIVIT = "Very high" Maps of critical habitat for highly range-restricted species, here defined as any plant species with a known distribution range smaller than 10 km². These polygons were expert delineated based on the known extent of suitable habitat for these species at sites where they are known to occur. Loss of natural vegetation at these sites is therefore highly likely to result in species extinctions, or otherwise a significant increase in the risk of extinction of the species present. SENSITIVIT = "High" Known distributions for species with ranges larger than 10 km²were generated based on recent, precise, point occurrence records confirming the presence of a species at a site. The point occurrence records were generalized to small areas of similar spectral signatures, that are representing relatively uniform habitat patches where the species is known to be present. The point occurrence dataset is maintained by the Threatened Species Unit at the South African National Biodiversity Institute, and combines occurrence data from more than 40 unique data sources, including herbaria, national and provincial conservation agencies, and citizen science projects. Extreme care is taken to confirm the accuracy of records used to generate the maps, but the dataset may contain errors. SENSITIVIT = "Medium" Medium sensitivity is based on modelled distribution ranges, and indicates areas where suitable habitat for a species is present, but its presence at the site needs to be confirmed by field surveys. Distribution models are expert-driven suitable habitat models, and is derived by combining areas of suitable vegetation types and altitudes within the known ranges of species. Distribution maps are based on best available data for plant species, many of which are poorly known, and therefore the ability to generate accurate maps is constrained. This third level of sensitivity is a critically important consideration in a country with very high levels of biodiversity where most areas have not recently or never been thoroughly surveyed. Care was taken to limit predicted areas to no more than 10 km outside the known range of a species, so as to avoid excessive survey requirements. SENSITIVIT = "Low" There are large parts of South Africa where no plant species of conservation concern are expected to occur, and these areas are designated in the Low sensitivity category.

Definition Expression: N/A

Copyright Text:

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MaxRecordCount: 1000

Supported Query Formats: JSON, AMF, geoJSON

Min Scale: 0

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YMin: -34.83417000334293
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Spatial Reference: 4326  (4326)

Drawing Info:

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Labeling Info:

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Fields:

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• Shape ( type: esriFieldTypeGeometry , alias: Shape )
• OBJECTID ( type: esriFieldTypeInteger , alias: OBJECTID )
• THEME ( type: esriFieldTypeString , alias: THEME , length: 254 )
• SENSFEAT ( type: esriFieldTypeString , alias: Sensitvity features: , length: 254 )
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Supported Operations:   Query   Generate Renderer   Return Updates