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Property Organism Value Units ID Details
Estimates of the local density of individual birds (number/km^2) of all species at seven forest sites on five continents Birds Table - link individuals/km^2 116942 Kevin J. Gaston & Tim...
Estimates for the number of individual birds in different countries with mean density Birds Table - link N/A 116943 Kevin J. Gaston & Tim...
Number of individual seabirds breeding in Britain Birds 6.67e+6 individual birds 116944 Kevin J. Gaston & Tim...
Fraction of species in breeding avifauna which comprises seabirds Birds in Britain 16 %: globaly ~4 % 116945 Kevin J. Gaston & Tim...
Number of migratory birds lost to hunting and trapping in the Mediterranean countries each year Biosphere 1e+9 birds/year 116946 Kevin J. Gaston & Tim...
Number of birds lost to predation by domestic cats in the USA each year according to different sources Biosphere Winkler et al., 80 million birds/year: Walsberg 319 - 638 birds/year 116947 Kevin J. Gaston & Tim...
Estimates for the number of individual birds in Africa and the Nearctic with mean density Birds Table - link N/A 116950 Kevin J. Gaston & Tim...
Fraction of insect species per taxonomic order that have contracting ranges in the UK Biosphere 30 - 60 % of species per taxonomic order 117267 Ceballos G, Ehrlich PR...
Signature genes and genome size range for the proposed phage groups Bacteriophage Table - link N/A 112575 Rohwer F, Edwards R....
Number of bird specimens on Earth Biosphere 200 - 400 billion (10^9) birds 116940 Kevin J. Gaston & Tim...
Oxygen concentration below which 50% of coastal marine animal species die Various ~70 μmol/kg 108704 Seibel BA. Critical oxygen...
Estimated number of beetle species that are hosted by one species of tropical tree Biosphere 160 Species 103930 May RM. How Many Species...
Number of microbial species contained in one gram of soil Microbes 2,000 to 50,000 Species 107286 Zhili He, Joy D. Van Nostrand...
Estimated number of species in different phyla Biosphere Table - link N/A 102525 Lecointre, G. and H....
Number of plants species Biosphere 270,000-400,000 unitless 105635 Saito K, Matsuda F. ...
Number of species catalogued in a central database as of 2011 Biosphere ~1.2e6 species 109316 Mora C, Tittensor DP...
Total number of trees, median tree density and number of tree species in [the ~6-million-km^2 landscape of] Amazonia Biosphere Total number of trees 3.9×10^11: median tree density 565 trees/ha: ~16,000 tree species N/A 112912 ter Steege H et al. ...
Estimated total number of species of organisms Biosphere 3e6-5e6 Species 103931 May RM. How Many Species...
Number of described species of organisms Biosphere 2e+6 Unitless 103927 May RM. How Many Species...
Estimated number of species in the orchid family (the most species-rich of all angiosperm families) Plant orchid 25000 Species 106653 Hsiao et al., Researches...