Dominant Species is an unpublished novel by Alastair Reynolds and a sequel to the also-unpublished Union World; according to http://alastairreynolds.com/about/formative-years it was his second novel after Union World, and he has no plans to publish it.

[Dominant Species was] a much better book [than Union World] – in my opinion – and this time my influences were Pohl, Benford and Joe Haldeman. I even went to the extent of making my own “faked” documents to include in the book, in the style of Haldeman’s Mindbridge.

Reynolds contrasts the style of their shared universe with that of the subsequent Revelation Space universe:

I was dissatisfied with many of the underlying assumptions of the universe and decided my next book would be proper serious hard SF with no faster-than-light, tractor beams etc. There would be no cosy aliens with similar technologies to our own.

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