Scale and species numbers.

@article{Godfray2001ScaleAS,
  title={Scale and species numbers.},
  author={H C.J. Godfray and John Hartley Lawton},
  journal={Trends in ecology & evolution},
  year={2001},
  volume={16 7},
  pages={400-404}
}
One of the main tasks confronting community ecologists is to explain why a particular site harbours a certain number of species. The site might range from a drop of water to the whole Earth, and the species might be drawn from a very restricted taxon or include all living organisms. The common problem, however, is to understand the relative importance of speciation and extinction and, more locally, of immigration and loss. Speciation is the ultimate motor driving biodiversity and ecologists… CONTINUE READING