Archipelagos of the Anthropocene

rapid and extensive differentiation of native terrestrial vertebrates in a single metropolis

Bethan L. Littleford-Colquhoun, Christofer Clemente, Martin J. Whiting, Daniel Ortiz-Barrientos, Celine H. Frère*

*Corresponding author for this work

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Some of the best evidence for rapid evolutionary change comes from studies of archipelagos and oceanic islands. City parks are analogous systems as they create geographically isolated green spaces that differ in size, structure and complexity. Very little, however, is known about whether city parks within a single urban centre drive selection and result in the diversification of native species. Here, we provide evidence for the rapid genetic and morphological differentiation of a native lizard (Intellagama lesueurii) at four geographically close yet unconnected parks within one city. Year of establishment of each city park varied from 1855 (oldest) to 2001 (youngest) equating to a generation time range of 32 to three generations. Genetic divergence among city park populations was large despite the small pairwise geographic distances (<5 km) and found to be two to three times higher for microsatellites and three to 33 times higher for mtDNA relative to nonurban populations. Patterns of morphological differentiation were also found to be most extensive among the four city park populations. In contrast to nonurban populations, city park populations showed significant differentiation in relative body size, relative head and limb morphology and relative forelimb and hindlimb length. Crucially, we show that these patterns of differentiation are unlikely to have been caused by founder events and/or drift alone. Our results suggest that city park 'archipelagos' could represent theatres for rapid evolution that may, in time, favour adaptive diversification.

Original languageEnglish
Pages (from-to)2466-2481
Number of pages16
JournalMolecular Ecology
Volume26
Issue number9
DOIs
Publication statusPublished - May 2017

Keywords

  • genetics
  • local adaptation
  • morphology
  • reptiles
  • urbanization

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