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Selection: Jetz:W [6 articles] 

Publications by author Jetz:W.
 

Integrating biodiversity distribution knowledge: toward a global map of life

  
Trends in Ecology & Evolution, Vol. 27, No. 3. (March 2012), pp. 151-159, https://doi.org/10.1016/j.tree.2011.09.007

Abstract

Global knowledge about the spatial distribution of species is orders of magnitude coarser in resolution than other geographically-structured environmental datasets such as topography or land cover. Yet such knowledge is crucial in deciphering ecological and evolutionary processes and in managing global change. In this review, we propose a conceptual and cyber-infrastructure framework for refining species distributional knowledge that is novel in its ability to mobilize and integrate diverse types of data such that their collective strengths overcome individual weaknesses. The ultimate ...

 

Near-global freshwater-specific environmental variables for biodiversity analyses in 1 km resolution

  
Scientific Data, Vol. 2 (8 December 2015), 150073, https://doi.org/10.1038/sdata.2015.73

Abstract

The lack of freshwater-specific environmental information at sufficiently fine spatial grain hampers broad-scale analyses in aquatic biology, biogeography, conservation, and ecology. Here we present a near-global, spatially continuous, and freshwater-specific set of environmental variables in a standardized 1 km grid. We delineate the sub-catchment for each grid cell along the HydroSHEDS river network and summarize the upstream climate, topography, land cover, surface geology and soil to each grid cell using various metrics (average, minimum, maximum, range, sum, inverse distance-weighted average and sum). ...

 

A global 1-km consensus land-cover product for biodiversity and ecosystem modelling

  
Global Ecology and Biogeography, Vol. 23, No. 9. (1 September 2014), pp. 1031-1045, https://doi.org/10.1111/geb.12182

Abstract

[Aim] For many applications in biodiversity and ecology, existing remote sensing-derived land-cover products have limitations due to among-product inconsistency and their typically non-continuous nature. Here we aim to help address these shortcomings by generating a 1-km resolution global product that provides scale-integrated and accuracy-weighted consensus land-cover information on an approximately continuous scale. [Location] Global. [Methods] Using a generalized classification scheme and an accuracy-based integration approach, we integrated four global land-cover products. We evaluated the performance of this product compared with inputs for estimating subpixel 30-m resolution ...

 

An assessment of methods and remote-sensing derived covariates for regional predictions of 1 km daily maximum air temperature

  
Remote Sensing, Vol. 6, No. 9. (16 September 2014), pp. 8639-8670, https://doi.org/10.3390/rs6098639

Abstract

The monitoring and prediction of biodiversity and environmental changes is constrained by the availability of accurate and spatially contiguous climatic variables at fine temporal and spatial grains. In this study, we evaluate best practices for generating gridded, one-kilometer resolution, daily maximum air temperature surfaces in a regional context, the state of Oregon, USA. Covariates used in the interpolation include remote sensing derived elevation, aspect, canopy height, percent forest cover and MODIS Land Surface Temperature (LST). Because of missing values, ...

 

Mapping tree density at a global scale

  
Nature, Vol. 525, No. 7568. (2 September 2015), pp. 201-205, https://doi.org/10.1038/nature14967

Abstract

The global extent and distribution of forest trees is central to our understanding of the terrestrial biosphere. We provide the first spatially continuous map of forest tree density at a global scale. This map reveals that the global number of trees is approximately 3.04 trillion, an order of magnitude higher than the previous estimate. Of these trees, approximately 1.39 trillion exist in tropical and subtropical forests, with 0.74 trillion in boreal regions and 0.61 trillion in temperate regions. Biome-level trends in ...

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Bioclimatic and physical characterization of the world’s islands

  
Proceedings of the National Academy of Sciences, Vol. 110, No. 38. (17 September 2013), pp. 15307-15312, https://doi.org/10.1073/pnas.1306309110

Abstract

The Earth’s islands harbor a distinct, yet highly threatened, biological and cultural diversity that has been shaped by geographic isolation and unique environments. Island systems are key natural laboratories for testing theory in ecology and evolution. However, despite their potential usefulness for research, a quantitative description of island environments and an environmental classification are still lacking. Here, we prepare a standardized dataset and perform a comprehensive global environmental characterization for 17,883 of the world’s marine islands >1 km2 (∼98% of total ...

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