منابع مشابه
How many species are there on Earth?
This article surveys current answers to the factual question posed in the title and reviews the kinds of information that are needed to make these answers more precise. Various factors affecting diversity are also reviewed. These include the structure of food webs, the relative abundance of species, the number of species and of individuals in different categories of body size, along with other ...
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Movement on earth is effected by bodies (e.g. river channels, animals, vehicles) of seemingly random scales, large and small. Here we use the constructal law and the design of ‘distributed energy systems’ to show that the large must be few and the small many, in particular proportions that are required for greater access for movement on areas. First, we demonstrate that mass movement per kilogr...
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We analyze usage patterns of Many Eyes and Tableau Public, two popular Web-based visualization systems. Between them, they have been used by tens of thousands of authors to create hundreds of thousands of visualizations, yet we know very little about who uses them and how. While visualization is common in news media, and data visualizations are consumed by millions of readers and viewers, it is...
متن کاملHow Many Species Are There on Earth and in the Ocean?
The diversity of life is one of the most striking aspects of our planet; hence knowing how many species inhabit Earth is among the most fundamental questions in science. Yet the answer to this question remains enigmatic, as efforts to sample the world's biodiversity to date have been limited and thus have precluded direct quantification of global species richness, and because indirect estimates...
متن کاملHow many species are there on Earth and in the Ocean? Short title: On the number of species on Earth and in the ocean
The diversity of life is one of the most striking aspects of our planet; hence knowing how many species inhabit Earth is among the most fundamental questions in science. Yet the answer to this question remains enigmatic because the limited sampling of the world’s biodiversity has precluded direct quantification, and because indirect estimations rely on assumptions that have proven highly contro...
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ژورنال
عنوان ژورنال: Nature
سال: 2014
ISSN: 0028-0836,1476-4687
DOI: 10.1038/505143a