
Abstract: "Habitat destruction is among the greatest threats facing biodiversity, 
affecting common and threatened species alike. However, metrics for 
communicating its impacts typically overlook the non‐threatened 
component of assemblages. This risks the loss of habitat for species 
that comprise the majority of assemblages going unreported. Here, we 
adapt a widely‐used measure for summarizing researcher output (the h 
index) to provide the first metric describing natural habitat loss for 
entire assemblages, inclusive of threatened and non‐threatened species. 
For each of 447 Australian native terrestrial bird species, information 
on their association with broad vegetation groups was combined with 
distributional range maps to identify the difference between the 
estimated pre‐European and current extents of potential habitat. From 
this, we calculated the ‘Loss Index’ (LI), which reveals that 30% of 
native birds have each lost at least 30% of their potential natural 
habitat—an LI of 30. At the sub‐continental scale, the LI ranges from 15
 in arid Australia to 61 in the highly transformed south‐east of the 
country. Further, different subcomponents of the assemblage have 
different LI values; for example, Australia's parrots ( n=52 species) 
have an LI of 38, while raptors ( n=32 species) have an LI of 25. The 
LI is simple to calculate, and can be determined using readily available
 spatial information on species distributions, habitat associations and 
human impacts on natural land cover. This metric, including the curves 
that are used to deduce it, could complement other biodiversity indices 
by being used for regional and global biodiversity assessments, 
comparing the status of natural habitat extent for assemblages within 
and among nations, monitoring changes through time, and forecasting 
future changes to guide strategic land use planning. The LI is an 
intuitive tool with which to summarise and communicate how human actions
 affect whole assemblages, and not just those that species identified as
 threatened."
Read More: https://onlinelibrary.wiley.com/doi/abs/10.1111/cobi.13331