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In this study, we examined age-related reproductive senescence in Megachile rotundata, a solitary bee and important agricultural pollinator. We hypothesized that, similarly to social bees, aging females would show declines in foraging behavior and reproductive fitness. Contrary to this hypothesis, we found no evidence of reproductive senescence in M. rotundata within the timeframe observed. Instead, older females increased their foraging rate, leading to larger provisions and offspring. We also observed that older bees exhibited improved foraging efficiency, likely due to learning and muscle physiology changes. Furthermore, ovarian development showed no decline with age, indicating that reproductive capacity remains stable throughout the observed timeframe. Our results challenge conventional assumptions about reproductive senescence in solitary bees and suggest that older M. rotundata may contribute to more efficient pollination, with implications for pollinator management. This study provides new insights into the aging process in solitary bees, emphasizing the need for further research into the mechanisms behind age-related behavioral and reproductive changes.<\/jats:p>","DOI":"10.3390\/insects16060612","type":"journal-article","created":{"date-parts":[[2025,6,10]],"date-time":"2025-06-10T08:18:43Z","timestamp":1749543523000},"page":"612","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Reproductive Senescence in the Pollinator, Megachile rotundata"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-3075-7796","authenticated-orcid":false,"given":"Jacob B.","family":"Pithan","sequence":"first","affiliation":[{"name":"Department of Biological Sciences, North Dakota State University, Fargo, ND 58102, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-5049-0503","authenticated-orcid":false,"given":"Brooke L.","family":"Kohler","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences, North Dakota State University, Fargo, ND 58102, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1587-2891","authenticated-orcid":false,"given":"Arun","family":"Rajamohan","sequence":"additional","affiliation":[{"name":"USDA-ARS, Fargo, ND 58102, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kendra J.","family":"Greenlee","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences, North Dakota State University, Fargo, ND 58102, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,6,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"23","DOI":"10.1017\/9781139939867.002","article-title":"The disposable soma theory","volume":"552","author":"Kirkwood","year":"2017","journal-title":"Evol. 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