Spatial sorting promotes the spread of maladaptive hybridization

Winsor H. Lowe, Clint C. Muhlfeld, Fred W. Allendorf

Research output: Contribution to journalReview articlepeer-review

37 Scopus citations


Invasive hybridization is causing loss of biodiversity worldwide. The spread of such introgression can occur even when hybrids have reduced Darwinian fitness, which decreases the frequency of hybrids due to low survival or reproduction through time. This paradox can be partially explained by spatial sorting, where genotypes associated with dispersal increase in frequency at the edge of expansion, fueling further expansion and allowing invasive hybrids to increase in frequency through space rather than time. Furthermore, because all progeny of a hybrid will be hybrids (i.e., will possess genes from both parental taxa), nonnative admixture in invaded populations can increase even when most hybrid progeny do not survive. Broader understanding of spatial sorting is needed to protect native biodiversity.

Original languageEnglish
Pages (from-to)456-462
Number of pages7
JournalTrends in Ecology and Evolution
Issue number8
StatePublished - Aug 1 2015


  • Biodiversity
  • Conservation
  • Dispersal
  • Evolution
  • Introgression
  • Invasive species


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