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Differences in the circadian timing of locomotor activity and rest periods can facilitate habitat partitioning and the exploitation of novel niches. As a consequence, closely related species often display highly divergent activity patterns, suggesting that shifts from diurnal to nocturnal behavior, or vice versa, are critical for survival. In Africa\u2019s Lake Malawi alone, there are over 500 species of cichlids, which inhabit diverse environments and exhibit extensive phenotypic variation. We have previously identified a substantial range in activity patterns across adult Lake Malawi cichlid species, from strongly diurnal to strongly nocturnal. In many species, including fishes, ecological pressures differ dramatically across life-history stages, raising the possibility that activity patterns may change over ontogeny. To determine if rest-activity patterns change across life stages, we compared the locomotor patterns of six Lake Malawi cichlid species\n                    <jats:italic>.<\/jats:italic>\n                    While total rest and activity did not change between early juvenile and adult stages, rest-activity patterns did, with juveniles displaying distinct activity rhythms that are more robust than adults. One distinct difference between juveniles and adults is the emergence of complex social behavior. To determine whether social context is required for activity rhythms, we next measured locomotor behavior in group-housed adult fish. We found that when normal social interactions were allowed, locomotor activity patterns were restored, supporting the notion that social interactions promote circadian regulation of activity in adult fish. These findings reveal a previously unidentified link between developmental stage and social interactions in the circadian timing of cichlid activity.\n                  <\/jats:p>","DOI":"10.1007\/s00360-023-01523-3","type":"journal-article","created":{"date-parts":[[2023,11,1]],"date-time":"2023-11-01T01:06:11Z","timestamp":1698800771000},"page":"299-313","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Ontogeny and social context regulate the circadian activity patterns of Lake Malawi cichlids"],"prefix":"10.1007","volume":"194","author":[{"given":"Evan","family":"Lloyd","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aakriti","family":"Rastogi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Niah","family":"Holtz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ben","family":"Aaronson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R.","family":"Craig Albertson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6118-5537","authenticated-orcid":false,"given":"Alex C.","family":"Keene","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,11,1]]},"reference":[{"key":"1523_CR1","doi-asserted-by":"publisher","first-page":"1849","DOI":"10.5665\/sleep.5226","volume":"38","author":"DMDM Arble","year":"2015","unstructured":"Arble DMDM, Bass J, Behn CDCD, Butler MPMP, Challet E, Czeisler C, Depner CM, Elmquist J, Franken P, Grandner MA et al (2015) Impact of sleep and circadian disruption on energy balance and diabetes\u202f: a summary of workshop discussions. 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