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One of those, the Drug Hypothesis, states that aromatic plants present in nests have positive effects on nestlings\u2019 development through increased immune function. In this study, we aimed to examine if experimental addition of aromatic plants had positive effects on reproductive performance (the number of fledglings produced and nestling survival rate) and nestling development (weight and tarsus length). In addition, we study whether those potential effects were more noticeable in different brood sizes\u2013small and large\u2013through an observational approach. We expect that large broods, due to increased resource competition between nestlings, will benefit more from aromatic plant incorporation, as compared to small broods. Nestlings were significantly heavier in 2015 as compared to 2016 and 2017 and in small broods. No effect of treatment was observed in nestling weight. Although there was no overall effect of treatment on nestling tarsus length, nestlings from aromatic nests had significantly longer tarsi as compared to nestlings from control nests, in large broods.<\/jats:p>","DOI":"10.1177\/1758155920921075","type":"journal-article","created":{"date-parts":[[2020,6,3]],"date-time":"2020-06-03T01:51:22Z","timestamp":1591149082000},"page":"44-48","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":7,"title":["Development of nestling blue tits (\n                    <i>Cyanistes caeruleus<\/i>\n                    ) is affected by experimental addition of aromatic plants"],"prefix":"10.1177","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3087-8669","authenticated-orcid":false,"given":"B\u00e1rbara A","family":"Pires","sequence":"first","affiliation":[{"name":"Mediterranean Institute for Agriculture, Environment and Development (MED), Instituto de Investiga\u00e7\u00e3o e Forma\u00e7\u00e3o Avan\u00e7ada (IIFA), Universidade de \u00c9vora \u2013 P\u00f3lo da Mitra, \u00c9vora, Portugal"}]},{"given":"Anabela DF","family":"Belo","sequence":"additional","affiliation":[{"name":"Mediterranean Institute for Agriculture, Environment and Development (MED), Departamento de Biologia, Escola de Ci\u00eancias e Tecnologia, Universidade de \u00c9vora \u2013 P\u00f3lo da Mitra, \u00c9vora, Portugal"}]},{"given":"Fernanda","family":"Diamantino","sequence":"additional","affiliation":[{"name":"Centro de Estat\u00edstica e Aplica\u00e7\u00f5es, Faculdade de Ci\u00eancias, Universidade de Lisboa, Lisboa, Portugal"}]},{"given":"Jo\u00e3o E","family":"Raba\u00e7a","sequence":"additional","affiliation":[{"name":"Mediterranean Institute for Agriculture, Environment and Development (MED), Departamento de Biologia, Escola de Ci\u00eancias e Tecnologia, Universidade de \u00c9vora \u2013 P\u00f3lo da Mitra, \u00c9vora, Portugal"},{"name":"Laborat\u00f3rio de Ornitologia (LabOr), Mediterranean Institute for Agriculture, Environment and Development (MED), Universidade de \u00c9vora \u2013 P\u00f3lo da Mitra, \u00c9vora, Portugal"}]},{"given":"Santiago","family":"Merino","sequence":"additional","affiliation":[{"name":"Departamento de Ecolog\u00eda Evolutiva, Museo Nacional de Ciencias Naturales, CSIC, Madrid, Spain"}]}],"member":"179","published-online":{"date-parts":[[2020,6,2]]},"reference":[{"key":"bibr1-1758155920921075","doi-asserted-by":"publisher","DOI":"10.1093\/auk\/101.3.615"},{"key":"bibr2-1758155920921075","doi-asserted-by":"publisher","DOI":"10.1007\/BF01651244"},{"key":"bibr3-1758155920921075","doi-asserted-by":"publisher","DOI":"10.1093\/acprof:oso\/9780198718666.001.0001"},{"key":"bibr4-1758155920921075","doi-asserted-by":"publisher","DOI":"10.1016\/j.anbehav.2008.11.008"},{"key":"bibr5-1758155920921075","doi-asserted-by":"publisher","DOI":"10.3184\/175815513X13615363233558"},{"key":"bibr6-1758155920921075","doi-asserted-by":"publisher","DOI":"10.1007\/BF00379183"},{"key":"bibr7-1758155920921075","doi-asserted-by":"publisher","DOI":"10.1676\/11-102.1"},{"key":"bibr8-1758155920921075","doi-asserted-by":"publisher","DOI":"10.1006\/anbe.1999.1306"},{"key":"bibr9-1758155920921075","doi-asserted-by":"publisher","DOI":"10.1016\/j.anbehav.2003.07.005"},{"key":"bibr10-1758155920921075","doi-asserted-by":"publisher","DOI":"10.1016\/S1146-609X(00)00122-3"},{"key":"bibr11-1758155920921075","doi-asserted-by":"publisher","DOI":"10.1093\/beheco\/arv056"},{"key":"bibr12-1758155920921075","doi-asserted-by":"publisher","DOI":"10.1111\/j.0908-8857.2008.04400.x"},{"key":"bibr13-1758155920921075","doi-asserted-by":"publisher","DOI":"10.1139\/z04-076"},{"key":"bibr14-1758155920921075","doi-asserted-by":"publisher","DOI":"10.1111\/j.2007.0908-8857.04015.x"},{"key":"bibr15-1758155920921075","doi-asserted-by":"publisher","DOI":"10.1007\/BF00328399"},{"key":"bibr16-1758155920921075","doi-asserted-by":"publisher","DOI":"10.1016\/j.beproc.2012.02.003"},{"key":"bibr17-1758155920921075","first-page":"280","volume":"52","author":"Gwinner H","year":"2006","journal-title":"Acta Zool Sin"},{"key":"bibr18-1758155920921075","doi-asserted-by":"publisher","DOI":"10.1098\/rspb.2018.0376"},{"key":"bibr19-1758155920921075","doi-asserted-by":"publisher","DOI":"10.1007\/s10336-011-0706-1"},{"key":"bibr20-1758155920921075","unstructured":"Instituto Portugu\u00eas do Mar e da Atmosfera. 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