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But how these rhamnolipids interact with biogels to assist swarming remains unclear. Here, I use a combination of optical techniques across scales and genetically engineered strains to demonstrate that rhamnolipids can induce agar gel swelling over distances &gt;10,000\u00d7 the body size of an individual cell. The swelling front is on the micrometric scale and is easily visible using shadowgraphy. Rhamnolipid transport is not restricted to the surface of the gel but occurs through the whole thickness of the plate and, consequently, the spreading dynamics depend on the local thickness. Surprisingly, rhamnolipids can cross the whole gel and induce swelling on the opposite side of a two\u2010face Petri dish. The swelling front delimits an area where the mechanical properties of the surface properties are modified: water wets the surface more easily, which increases the motility of individual bacteria and enables collective motility. A genetically engineered mutant unable to secrete rhamnolipids (\u0394\n                    <jats:italic>rhlA<\/jats:italic>\n                    ), and therefore unable to swarm, is rescued from afar with rhamnolipids produced by a remote colony. These results exemplify the remarkable capacity of bacteria to change the physical environment around them and its ecological consequences.\n                  <\/jats:p>","DOI":"10.1111\/1462-2920.16373","type":"journal-article","created":{"date-parts":[[2023,3,25]],"date-time":"2023-03-25T15:37:58Z","timestamp":1679758678000},"page":"1451-1464","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Long\u2010range alteration of the physical environment mediates cooperation between\n                    <scp>\n                      <i>Pseudomonas aeruginosa<\/i>\n                    <\/scp>\n                    swarming colonies"],"prefix":"10.1111","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1377-6727","authenticated-orcid":false,"given":"Maxime","family":"Deforet","sequence":"first","affiliation":[{"name":"Sorbonne Universit\u00e9 Centre National de la Recherche Scientifique, Laboratoire Jean Perrin, 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