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Local and global density have distinct and parasite-dependent effects on infection in wild sheep
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Local and global density have distinct and parasite-dependent effects on infection in wild sheep
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Local and global density have distinct and parasite-dependent effects on infection in wild sheep
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Journal Article
Local and global density have distinct and parasite-dependent effects on infection in wild sheep
2025
Overview
High density should drive greater parasite exposure. However, evidence linking density with infection generally uses density proxies or measures of population size, rather than measures of individuals per space within a continuous population. We used a long-term study of wild sheep to link within-population spatiotemporal variation in host density with individual parasite counts. Although four parasites exhibited strong positive relationships with local density, these relationships were mostly restricted to juveniles and faded in adults. Furthermore, one ectoparasite showed strong negative relationships across all age classes. In contrast, population size – a measure of global density – had limited explanatory power, and its effects did not remove those of spatial density, but were distinct. These results indicate that local and global density can exhibit diverse and contrasting effects on infection within populations. Spatial measures of within-population local density may provide substantial additional insight to temporal metrics based on population size, and investigating them more widely could be revealing.
Publisher
Cambridge University Press
