Diversity and the coevolution of competitors, or the ghost of competition past

@article{Connell1980DiversityAT,
  title={Diversity and the coevolution of competitors, or the ghost of competition past},
  author={Joseph H. Connell},
  journal={Oikos},
  year={1980},
  volume={35},
  pages={131}
}
That niches of competitors in ecological communities are shaped by mutual coevolution, which thus allows many species to coexist, is a commonly-held view. Two species must live together consistently to coevolve, so since predators (or parasites) are dependent upon their prey, they will necessarily co-occur with them and so should coevolve. In contrast, competing species, which are not dependent on each other, need not consistently co-occur or coevolve. Increased diversity, by reducing the… 

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