Journal
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
Volume 285, Issue 1881, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rspb.2018.0694
Keywords
symbiosis; ectosymbiosis; mutualism; coevolution; diversification
Categories
Funding
- McIntire-Stennis Cooperative Forestry Program
- Agriculture and Food Research Initiative Competitive from the USDA National Institute of Food and Agriculture [2013-67011-21113]
- NSF GRFP
- NSF GROW [DGE-1313190]
- National Institutes of Health S10 Instrumentation grants [S10RR029668, S10RR027303]
- University of Montana Genomics Core - M.J. Murdock Charitable Trust
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Cascading speciation is predicted to occur when multiple interacting species diverge in parallel as a result of divergence in one species promoting adaptive differentiation in other species. However, there are few examples where ecological interactions among taxa have been shown to result in speciation that cascades across multiple trophic levels. Here, we test for cascading speciation occurring among the western pine beetle (Dendroctonus brevicomis), its primary host tree (Pinus ponderosa), and the beetle's fungal mutualists (Ceratocystiopsis brevicomi and Entomocorticium sp. B). We assembled genomes for the beetle and a fungal symbiont and then generated reduced representation genomic data (RADseq) from range-wide samples of these three interacting species. Combined with published data for the host tree, we present clear evidence that the tree, the beetle, and the fungal symbionts are all genetically structured into at least two distinct groups that have strongly codiverged with geographical isolation. We then combine our genomic results with diverse population and laboratory-based data to show evidence for reproductive isolation at each level of the cascade and for coevolution of both antagonistic and mutualistic species interactions within this complex network.
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