Migration highways and migration barriers created by host-parasite interactions
Wiley for Centre National de la Recherche Scientifique (CNRS)
© 2016 John Wiley & Sons Ltd/CNRS
Co-evolving parasites may play a key role in host migration and population structure. Using co-evolving bacteria and viruses, we test general hypotheses as to how co-evolving parasites affect the success of passive host migration between habitats that can support different intensities of host-parasite interactions. First, we show that parasites aid migration from areas of intense to weak co-evolutionary interactions and impede migration in the opposite direction, as a result of intraspecific apparent competition mediated via parasites. Second, when habitats show qualitative difference such that some environments support parasite persistence while others do not, different population regulation forces (either parasitism or competitive exclusion) will reduce the success of migration in both directions. Our study shows that co-evolution with parasites can predictably homogenises or isolates host populations, depending on heterogeneity of abiotic conditions, with the second scenario constituting a novel type of 'isolation by adaptation'.
This study was funded by the National Natural Science Foundation of China (31670376 and 31421063) and the 111 project (B13008), and AB was supported by the Royal Society, BBSRC, NERC and AXA Research Fund.
This is the author accepted manuscript. The final version is available from Wiley via the DOI in this record.
Vol. 19 (12), pp. 1479 - 1485
Place of publication