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Contextual intactness of habitat for biodiversity: global extent, 30 arcsecond resolution
This global spatial layer of contextual intactness aims to identify priority areas around the world where protection and management will best promote biodiversity persistence. This layer was derived by integrating both the condition of each focal location and the condition of all other locations expected to have supported shared species with the fo... morecal location prior to any habitat degradation. The contextual intactness of each location (grid cell) is the proportion of habitat predicted to have once supported a similar assemblage of species but is now in worse condition than the focal location. This was derived using the BILBI global biodiversity assessment system, by integrating: (1) an updated map of the terrestrial human footprint on natural systems, and; (2) generalized dissimilarity models of species assemblage turnover for terrestrial vertebrates, invertebrates, and plants. less
Conservation and Biodiversity
01 Jan 2013
31 Dec 2013
The input datasets are:
(1) an updated map of the terrestrial human footprint on natural systems to describe current habitat condition (Venter et al. 2016);
(2) generalized dissimilarity models of species assemblage turnover for terrestrial vertebrates, invertebrates, and plants, derived using more than 100 million occurrence records from more than 400,000 species (Hoskins et al. 2019). These models enable the estimation of the similarity in species assemblages between any pair of locations, and subsequently the expected uniqueness of the biodiversity within any terrestrial location globally.
To determine the contextual intactness for each location across the globe, we combined the revised human footprint spatial layer and the predicted similarity in species assemblages between pairs of locations using the BILBI framework. For each grid cell i, we selected a spatially regular randomly positioned selection of n other grid cells j to compare to cell i . A sample of comparison cells is required because there are >200 million cells on the 1 km terrestrial grid of the planet, and comparing each grid cell with every other grid cell is computationally prohibitive. For this assessment, the number of other grid cells j was a minimum of 1% of the total grid cells within each of the world’s 7 biogeographic-realms (Antarctica being excluded) (Olson et al. 2001).
We then determined the expected similarity (sij) in species assemblages between cell i and each comparison cell j using the BILBI framework (Hoskins et al, 2019). The human footprint (HFP) value for cell i (HFPi) and all comparison cells j (HFPj) was also extracted. We then derived a histogram of the summed species assemblage similarity to grid cell i, within integer bands of the human footprint value for all the comparison cells j .
From this histogram, we then calculated: (a) the sum of the assemblage similarities to i where the comparison cell j had a higher human footprint to i, and; (b) the total sum of the all the assemblage similarities between i and j across all human footprint scores . The contextual intactness for grid cell i (CIi) was then calculated as the sum of assemblage similarities to i with a higher human footprint divided by the total sum of assemblage similarities to i:
This calculation was repeated for every terrestrial grid cell globally to derive a spatial map of contextual intactness for each taxonomic group (vertebrates, invertebrates, plants). The spatial layers for these three taxonomic groups were then averaged to derive a single contextual intactness layer for biodiversity, though future analyses could consider each taxonomic group separately.
A. J. Hoskins et al., (2019) Supporting global biodiversity assessment through high-resolution macroecological modelling: Methodological underpinnings of the BILBI framework. bioRxiv, 309377.
D. M. Olson et al. (2001) Terrestrial Ecoregions of the World: A New Map of Life on Earth: A new global map of terrestrial ecoregions provides an innovative tool for conserving biodiversity. BioScience 51, 933-938.
O. Venter et al., (2016) Sixteen years of change in the global terrestrial human footprint and implications for biodiversity conservation. Nature Communications 7, 12558.
Karel Mokany, Simon Ferrier, Thomas D. Harwood, Chris Ware, Moreno Di Marco, Hedley S. Grantham, Oscar Venter, Andrew J. Hoskins, James E.M. Watson (2020) Reconciling global priorities for conserving biodiversity habitat. Proceedings of the National Academy of Sciences USA (in press).
Creative Commons Attribution 4.0 International Licence
CSIRO (Australia), Sapienza University of Rome (Italy), University of Northern British Columbia (Canada), Wildlife Conservation Society (United States), The University of Queensland (Australia)
Mokany, Karel; Ferrier, Simon; Harwood, Tom; Ware, Chris; Di Marco, Moreno; Grantham, Hedley; Venter, Osar; Hoskins, Andrew; Watson, James (2020): Contextual intactness of habitat for biodiversity: global extent, 30 arcsecond resolution. v1. CSIRO. Data Collection.
All Rights (including copyright) CSIRO 2020.
The metadata and files (if any) are available to the public.
Senior Research Scientist
The value of intact habitat for conserving biodiversity
The aims of this collaborative project were to identify the value of relatively intact habitats globally in supporting the ongoing persistence of biodiversity. It aimed to identify the value of every location, represented as a 1km grid cell, given the uniqueness of the biodiversity associated with that location and the location’s intactness relativ... moree to the intactness of other environmentally and biologically similar locations. It thereby assessed how well the biodiversity in each location is represented in habitats across other locations, to help identify and map locations where future loss of relatively intact habitat is likely to have significant impact on biodiversity persistence. This research aimed to combine CSIRO’s world-leading BILBI global biodiversity assessment capability with UQ-WCS’s most advanced spatial data on human footprint globally. This project aimed to play an important role in highlighting the importance of conserving the best-remaining intact habitats to support biodiversity persistence globally, where intactness is context-dependent as opposed to an absolute value. less
Moreno Di Marco
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