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Trans. R. Soc. B"],"published-print":{"date-parts":[[2020,9,14]]},"abstract":"<jats:p>While only a single sperm may fertilize the egg, getting to the egg can be facilitated, and possibly enhanced, by sperm group dynamics. Examples range from the trains formed by wood mouse sperm to the bundles exhibited by echidna sperm. In addition, observations of wave-like patterns exhibited by ram semen are used to score prospective sample fertility for artificial insemination in agriculture. In this review, we discuss these experimental observations of collective dynamics, as well as describe recent mechanistic models that link the motion of individual sperm cells and their flagella to observed collective dynamics. Establishing this link in models involves negotiating the disparate time- and length scales involved, typically separated by a factor of 1000, to capture the dynamics at the greatest length scales affected by mechanisms at the shortest time scales. Finally, we provide some outlook on the subject, in particular, the open questions regarding how collective dynamics impacts fertility.<\/jats:p>\n                  <jats:p>This article is part of the theme issue \u2018Multi-scale analysis and modelling of collective migration in biological systems\u2019.<\/jats:p>","DOI":"10.1098\/rstb.2019.0384","type":"journal-article","created":{"date-parts":[[2020,7,26]],"date-time":"2020-07-26T19:05:41Z","timestamp":1595790341000},"page":"20190384","update-policy":"https:\/\/doi.org\/10.1098\/crossmark-policy","source":"Crossref","is-referenced-by-count":48,"title":["Collective dynamics of sperm cells"],"prefix":"10.1098","volume":"375","author":[{"given":"Simon F.","family":"Schoeller","sequence":"first","affiliation":[{"name":"Department of Mathematics, Imperial College London, London SW7 2AZ, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9039-8651","authenticated-orcid":true,"given":"William V.","family":"Holt","sequence":"additional","affiliation":[{"name":"Zoological Society of London, Regent\u2019s Park, London NW14RY, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9103-5687","authenticated-orcid":true,"given":"Eric E.","family":"Keaveny","sequence":"additional","affiliation":[{"name":"Department of Mathematics, Imperial College London, London SW7 2AZ, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"175","published-online":{"date-parts":[[2020,7,27]]},"reference":[{"key":"e_1_3_5_2_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF00124698"},{"key":"e_1_3_5_3_2","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1097-010X(19991015)285:3<178::AID-JEZ2>3.0.CO;2-#"},{"key":"e_1_3_5_4_2","doi-asserted-by":"publisher","DOI":"10.1017\/S1464793104006451"},{"key":"e_1_3_5_5_2","doi-asserted-by":"publisher","DOI":"10.1083\/jcb.76.3.569"},{"key":"e_1_3_5_6_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1469-185X.1970.tb01176.x"},{"key":"e_1_3_5_7_2","doi-asserted-by":"crossref","unstructured":"Birkhead TR M\u00f6ller A. 1998 Sperm competition and sexual selection . 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