Identification and dynamics of a cryptic suture zone in tropical rainforest
Moritz, C., Hoskin, C.J., MacKenzie, J.B., Phillips, B.L., Tonione, M., Silva, N., VanDerWal, Jeremy, Williams, S.E., and Graham, C.H. (2009) Identification and dynamics of a cryptic suture zone in tropical rainforest. Proceedings of the Royal Society of London Series B, Biological Sciences, 276 (1660). pp. 1235-1244.
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Suture zones, shared regions of secondary contact between long-isolated lineages, are natural laboratories for studying divergence and speciation. For tropical rainforest, the existence of suture zones and their significance for speciation has been controversial. Using comparative phylogeographic evidence, we locate a morphologically cryptic suture zone in the Australian Wet Tropics rainforest. Fourteen out of 18 contacts involve morphologically cryptic phylogeographic lineages, with mtDNA sequence divergences ranging from 2 to 15 per cent. Contact zones are significantly clustered in a suture zone located between two major Quaternary refugia. Within this area, there is a trend for secondary contacts to occur in regions with low environmental suitability relative to both adjacent refugia and, by inference, the parental lineages. The extent and form of reproductive isolation among interacting lineages varies across species, ranging from random admixture to speciation, in one case via reinforcement. Comparative phylogeographic studies, combined with environmental analysis at a fine-scale and across varying climates, can generate new insights into suture zone formation and to diversification processes in species-rich tropical rainforests. As arenas for evolutionary experimentation, suture zones merit special attention for conservation.
|Item Type:||Article (Refereed Research - C1)|
|Keywords:||Australia; wet tropics; secondary contact zone; hybrid zone; habitat suitability model; speciation|
|Date Deposited:||06 Aug 2009 01:13|
|FoR Codes:||06 BIOLOGICAL SCIENCES > 0602 Ecology > 060206 Palaeoecology @ 60%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060299 Ecology not elsewhere classified @ 40%
|SEO Codes:||96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960805 Flora, Fauna and Biodiversity at Regional or Larger Scales @ 80%
96 ENVIRONMENT > 9603 Climate and Climate Change > 960302 Climate Change Mitigation Strategies @ 20%
|Citation Count from Web of Science||