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Indicator Inventory completeness of flowering plants

Aim To assess the inventory completeness of flowering plants in Africa.

How to interpret the indicator?Inventory completeness ranges from values of zero to one. Values approaching one indicate a complete inventory.
 
High inventory completeness suggests that sampling efforts have been sufficient in a given area. For these well-sampled areas, species lists derived from GBIF may approximate well the set of species that can be found on the ground.
 
Note that high completeness may stem from specimens collected several decades ago. In view of recent land use change and loss of habitats, it is unclear whether old specimens still represent the set of species found on the ground.
 
We recommend interpreting inventory completeness together with the indicator year of collection of specimens and map of cropland area.
 
We also highlight the importance of data users being responsible for checking the date of collection of specimens, when using species lists derived from specimens retrieved from the Internet.
 
Geographical coverage
Africa
 
Download
Publication and Supplementary Information (with R code) : Mapping ignorance: 300 years of collecting flowering plants in Africa
Shapefile: Completeness Index

 

Layer Information

Completeness Index ? Indicator
Inventory completeness of flowering plants
 
Aim
To assess the inventory completeness of flowering plants in Africa and African protected areas.
 
Geographical coverage
Africa
 
How to interpret the indicator
Inventory completeness ranges from values of zero to one. Values approaching one indicate a complete inventory.
High inventory completeness suggests that sampling efforts have been sufficient in a given area. For these well-sampled areas, species lists derived from GBIF may approximate well the set of species that can be found on the ground.
Note that high completeness may stem from specimens collected several decades ago. In view of recent land use change and loss of habitats, it is unclear whether old specimens still represent the set of species found on the ground.
We recommend interpreting inventory completeness together with the indicator year of collection of specimens and map of cropland area.
 
Reference
Stropp et al. (2016). Mapping ignorance: 300 years of collecting flowering plants in Africa. Global Ecology and Biogeography.
Median Year ? Indicator
Year of collection of specimens of flowering plants
 
Aim
To assess the year of collection of specimens of flowering plants in Africa.
 
Geographical coverage
Africa

How to interpret the indicator
The year of collection indicated the point in time at  which most specimens of flowering plants in an given area of 25 x 25 km were collected.
 
Information based on specimens collected in the distant past may be used with caution. In view of recent land use change and loss of habitats, it is unclear whether old specimens still represent the set of species found on the ground.
 
How the indicator is calculated
The year of collection of specimens of flowering plants is calculated for sampling units (SU) of 25 x 25 km. Values represent the median across all years in which specimens were collected in each SU.
 
Reference
Stropp et al. (2016). Mapping ignorance: 300 years of collecting flowering plants in Africa. Global Ecology and Biogeography.