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In contrast, microbial community responses to elevation are still poorly understood. Specifically, the effects of elevation on vector-associated microbiota have not been studied to date, even though the within-vector microbial community is known to influence vector competence for a range of zoonotic pathogens. Here we characterize the structure and diversity of the bacterial microbiota in an important zoonotic disease vector, the sheep tick\n                    <jats:italic>Ixodes ricinus<\/jats:italic>\n                    , along replicated elevational gradient (630\u20131673\u00a0m) in the Swiss Alps. 16S rRNA sequencing of the whole within-tick bacterial microbiota of questing nymphs and adults revealed a decrease in Faith\u2019s phylogenetic microbial alpha diversity with increasing elevation, while beta diversity analyses revealed a lower variation in microbial community composition at higher elevations. We also found a higher microbial diversity later in the season and significant differences in microbial diversity among tick life stages and sexes, with lowest microbial alpha diversity observed in adult females. No associations between tick genetic diversity and bacterial diversity were observed. Our study demonstrates systematic changes in tick bacterial microbiota diversity along elevational gradients. The observed patterns mirror diversity changes along elevational gradients typically observed in macroscopic taxa, and they highlight the key role of environmental factors in shaping within-host microbial communities in ectotherms.\n                  <\/jats:p>","DOI":"10.1007\/s00248-021-01879-5","type":"journal-article","created":{"date-parts":[[2021,10,4]],"date-time":"2021-10-04T13:32:49Z","timestamp":1633354369000},"page":"868-878","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Elevational Changes in Bacterial Microbiota Structure and Diversity in an Arthropod-Disease Vector"],"prefix":"10.1007","volume":"84","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4285-7179","authenticated-orcid":false,"given":"Tuomas","family":"Aivelo","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M\u00e9lissa","family":"Lemoine","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4806-4102","authenticated-orcid":false,"given":"Barbara","family":"Tschirren","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,10,2]]},"reference":[{"key":"1879_CR1","doi-asserted-by":"publisher","first-page":"261","DOI":"10.1146\/annurev-ecolsys-110512-135750","volume":"44","author":"MK Sundqvist","year":"2013","unstructured":"Sundqvist MK, Sanders NJ, Wardle DA (2013) Community and ecosystem responses to elevational gradients: processes, mechanisms, and insights for global change. 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