Example code for Rowland JA, Bland LM, Keith DA, Juffe‐Bignoli D, Burgman MA, Etter A, Ferrer‐Paris JR, Miller RM, Skowno AL, Nicholson E. 2020. Ecosystem indices to support global biodiversity conservation. Conservation Letters 13:311. DOI: http://dx.doi.org/10.1111/conl.12680
The three scripts provided here include methods to calculate the three ecosystem indices presented in Rowland et al. (2020). Each script provides the code used to calculate each index and provides examples of the index output using the sample data as .csv files. The example data are from the continental assessment of the 136 temperate and tropical forests across 51 countries/territories in the Caribbean and Americas (Ferrer-Paris et al., 2018). The csv files are provided to demonstrate the structure of data required to calculate the indices.
Ferrer-Paris, J. R., Zager, I., Keith, D. A., Oliveira-Miranda, M. A., Rodríguez, J. P., Josse, C., … Barrow, E. (2018). An ecosystem risk assessment of temperate and tropical forests of the Americas with an outlook on future conservation strategies. Conservation Letters, 12. https://doi.org/10.1111/conl.12623
The Red List Index of ecosystems (RLIE) measures trends in ecosystem collapse risk. It uses the risk categories defined based on IUCN Red List of Ecosystems risk assessments. The index complements the Red List Index of species survival, providing comparable information about ecosystems risk. It is calculated for the overall risk category assigned to each ecosystem and separately for each criterion.
The Ecosystem Area Index (EAI) measures trends measures trends in changes in ecosystem area towards ecosystem collapse. The EAI is the geometric mean of the proportion of ecosystem area remaining over a given timeframe relative to the initial area and an ecosystem-specific collapse threshold. It uses data on ecosystem area and aea-based collapse threshold as defined based on IUCN Red List of Ecosystems risk assessments.
The Ecosystem Health Index (EHI) measures temporal changes in environmental conditions and biotic processes/interactions (hereafter collectively, ecological processes). The EHI uses relative severity of change in ecosystem-specific ecological variables and extent of the ecosystem affected to quantify transitions towards or away from ecosystem collapse. The index represents the geometric mean of the relative value of decline. It uses data defined in IUCN Red List of Ecosystems risk assessments.