Funding provided by: Howard Hughes Medical Institute
Crossref Funder Registry ID: http://dx.doi.org/10.13039/100000011
Award Number:
Funding provided by: National Institute of Allergy and Infectious Diseases
Crossref Funder Registry ID: http://dx.doi.org/10.13039/100000060
Award Number: 1R01AI123659-01A1
Funding provided by: David and Lucille Packard Foundation*
Crossref Funder Registry ID:
Award Number: NA
Parasites impose fitness costs on their hosts. Biologists often assume that natural selection favors infection-resistant hosts. Yet, when the immune response itself is costly, theory suggests selection may instead favor loss of resistance. Intraspecific variation in immune costs are rarely surveyed in a manner that tests evolutionary patterns, and there are few examples of adaptive loss of resistance. Here, we show that when marine threespine stickleback colonized freshwater lakes they gained resistance to the freshwater-associated tapeworm, Schistocephalus solidus. Extensive peritoneal fibrosis and inflammation is a commonly observed phenotype that contributes to suppression of cestode growth and viability, but also impose a substantial cost of reduced fecundity. Combining genetic mapping and population genomics, we find that opposing selection generates immune system differences between tolerant and resistant populations, consistent with divergent optimization.
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