Data from: Natural selection on a measure of parasite resistance varies across ages and environmental conditions in a wild mammal

Adam D. Hayward, Alastair J. Wilson, Jill G. Pilkington, Tim H. Clutton-Brock, Josephine M. Pemberton & Loeske E. B. Kruuk
Parasites detrimentally affect host fitness, leading to expectations of positive selection on host parasite resistance. However, since immunity is costly, host fitness may be maximized at low, but non-zero, 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 between parasite infection intensity and annual fitness...
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