Hayward, Adam D.; Wilson, Alastair J.; Pilkington, Jill G.; Clutton-Brock, Tim H; Pemberton, Josephine M; Kruuk, Loeske
Parasites detrimentally affect host fitness, leading to expectations of positive selection on host parasite resistance. However, as immunity is costly, host fitness may be maximized at low, but nonzero, parasite infection intensities. These hypotheses are rarely tested on natural variation in free-living populations. We investigated selection on a measure of host parasite resistance in a naturally regulated Soay sheep population using a longitudinal data set and found negative correlations...[Show more]
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