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Body size is easily measured and affects numerous ecological interactions, including transmission. In the snail\u2013schistosome system, larger snails have a higher exposure to parasites but lower susceptibility to infection per parasite. We quantified the effect of size\u2010based heterogeneity on population\u2010level transmission by conducting transmission trials in differently size\u2010structured snail populations and competing size\u2010dependent transmission models. Populations with greater proportions of large snails had lower prevalence, and small snails were shielded from infection by co\u2010occurring large conspecifics. Furthermore, a fully dependent transmission model that incorporated body size in both exposure and susceptibility outperformed other candidate models considered. Incorporating traits such as body size, which are affected by and directly affect host ecology, into transmission models could yield insights into natural dynamics and disease mitigation in many systems.<\/jats:p>","DOI":"10.1002\/ecy.4221","type":"journal-article","created":{"date-parts":[[2023,11,30]],"date-time":"2023-11-30T11:14:50Z","timestamp":1701342890000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Parasite transmission in size\u2010structured populations"],"prefix":"10.1002","volume":"105","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1297-8367","authenticated-orcid":false,"given":"Kelsey E.","family":"Shaw","sequence":"first","affiliation":[{"name":"Department of Biology Emory University  Atlanta Georgia USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rebecca E.","family":"Cloud","sequence":"additional","affiliation":[{"name":"School of Integrative Biology University of Illinois  Urbana\u2010Champaign Illinois USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Raeyan","family":"Syed","sequence":"additional","affiliation":[{"name":"Department of Biology Emory University  Atlanta Georgia USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8394-6288","authenticated-orcid":false,"given":"David J.","family":"Civitello","sequence":"additional","affiliation":[{"name":"Department of Biology Emory University  Atlanta Georgia USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,12,14]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1201\/b12537"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/0014-4894(72)90119-1"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1006\/eesa.1997.1627"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1098\/rspb.2007.1544"},{"key":"e_1_2_9_6_1","unstructured":"Bolker B. andR Development Core Team.2021.\u201cbbmle: Tools for General Maximum Likelihood Estimation.\u201dhttps:\/\/cran.r-project.org\/web\/packages\/bbmle\/bbmle.pdf."},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.tree.2011.01.009"},{"key":"e_1_2_9_8_1","doi-asserted-by":"crossref","unstructured":"Brooks M. 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