Science. 1988 Sep 16;241(4872):1441-9. doi: 10.1126/science.241.4872.1441.
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 determinants of the commonness and rarity of organisms.
本文调查了当前对标题中提出的事实问题的答案，并回顾了使这些答案更加准确所需的信息种类。还回顾了影响多样性的各种因素。这些因素包括食物网的结构、物种的相对丰度、不同体型类别中的物种和个体数量，以及生物体常见性和稀有性的其他决定因素。
