How many birds are there?
Source: Biodiversity and Conservation, Volume 6, Number 4, 1997 , pp. 615-625(11)
Abstract:Attempts to assess the magnitude of global biodiversity have focused on estimating species richness. However, this is but one component of biodiversity, and others, such as numbers of individuals or biomass, are at least as poorly known and just as important to quantify. Here, we use a variety of methods to estimate the global number of individuals for a single taxon, birds. The different methods yield surprisingly consistent estimates of a global bird population of between 200 billion and 400 billion individuals (1 billion=109). We discuss some of the implications of this figure.
Document Type: Regular Paper
Affiliations: 1: Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK 2: NERC Centre for Population Biology, Imperial College at Silwood Park, Ascot, Berkshire SL5 7PY, UK
Publication date: 1997