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There have been few records of mantled howler monkeys with leucism in Mexico and Costa Rica, but whole\u2010body leucism in howler monkeys from South America was unknown. In this article, we report for the first\u2010time documented cases of whole\u2010body leucism in young individuals of mantled howler monkeys <jats:italic>Alouatta palliata<\/jats:italic> in an isolated remanent of tropical dry forest in southwestern Ecuador known as Cerro Blanco Protective Forest. In total, we found two juvenile individuals with leucism in October 2021. The report of howler monkeys with whole\u2010body leucism may be caused by two processes: inbreeding because of isolated populations, environmental pressure caused by pollution, or the interaction of both. Our findings also reveal that hypopigmentation is becoming more frequent in howler monkey populations along its distributional range. Therefore, it is important to promote research in this field to disentangle the causes of hypopigmentation and to consider a regional management strategy for the species.<\/jats:p>","DOI":"10.1002\/ece3.9628","type":"journal-article","created":{"date-parts":[[2022,12,9]],"date-time":"2022-12-09T03:43:49Z","timestamp":1670557429000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Hypopigmentation in mantled howler monkeys <i>Alouatta palliata<\/i> (gray 1849): First documented cases of whole\u2010body leucism in South America"],"prefix":"10.1002","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0727-7996","authenticated-orcid":false,"given":"Cristian","family":"Barros\u2010Diaz","sequence":"first","affiliation":[{"name":"Fundaci\u00f3n para la Conservaci\u00f3n e Investigaci\u00f3n JaPu  Guayaquil Ecuador"},{"name":"Faculdad de Ciencias Exactas y Naturales Pontificia Universidad Cat\u00f3lica del Ecuador  Pichincha Ecuador"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6847-2720","authenticated-orcid":false,"given":"Silvia","family":"Vela","sequence":"additional","affiliation":[{"name":"Fundaci\u00f3n para la Conservaci\u00f3n e Investigaci\u00f3n JaPu  Guayaquil Ecuador"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1338-0068","authenticated-orcid":false,"given":"Abel","family":"Gallo\u2010P\u00e9rez","sequence":"additional","affiliation":[{"name":"Fundaci\u00f3n para la Conservaci\u00f3n e Investigaci\u00f3n JaPu  Guayaquil Ecuador"},{"name":"Facultad de Ciencias Naturales Universidad de Guayaquil  Guayaquil Ecuador"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5379-6784","authenticated-orcid":false,"given":"Manuel","family":"Chiquito","sequence":"additional","affiliation":[{"name":"Fundaci\u00f3n para la Conservaci\u00f3n e Investigaci\u00f3n JaPu  Guayaquil Ecuador"},{"name":"Facultad de Ciencias Naturales Universidad de Guayaquil  Guayaquil Ecuador"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4081-4047","authenticated-orcid":false,"given":"Xavier","family":"Cornejo","sequence":"additional","affiliation":[{"name":"Herbario GUAY, Departamento de Bot\u00e1nica, Facultad de Ciencias Naturales Universidad de Guayaquil  Guayaquil Ecuador"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8772-0155","authenticated-orcid":false,"given":"Denis","family":"Mosquera\u2010Mu\u00f1oz","sequence":"additional","affiliation":[{"name":"Fundaci\u00f3n para la Conservaci\u00f3n e Investigaci\u00f3n JaPu  Guayaquil Ecuador"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9205-5396","authenticated-orcid":false,"given":"Julian","family":"Perez\u2010Correa","sequence":"additional","affiliation":[{"name":"Fundaci\u00f3n para la Conservaci\u00f3n e Investigaci\u00f3n JaPu  Guayaquil Ecuador"},{"name":"Programa de Maestr\u00eda en Ciencias Marinas y Costeras, Facultad de Ciencias Naturales Universidad de Guayaquil  Guayaquil Ecuador"},{"name":"School of Biological Sciences University of Aberdeen  Aberdeen UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2022,12,8]]},"reference":[{"issue":"2","key":"e_1_2_8_2_1","first-page":"413","article-title":"Leucistic south American sea lion in Chile, with a review of anomalously color in otariids","volume":"43","author":"Acevedo J.","year":"2008","journal-title":"Revista de Biologia marina y Oceanografia"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.28947\/hrmo.2005.6.2.23"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10764\u2010006\u20109061\u20100"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1159\/000501186"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.4257\/oeco.2016.2001.10"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1601\u20105223.2000.t01\u20101\u201000167.x"},{"key":"e_1_2_8_8_1","volume-title":"Biodiversity and conservation in Tumbesian Ecuador and Peru","author":"Best B.","year":"1995"},{"key":"e_1_2_8_9_1","volume-title":"Endemic bird area factsheet: Tumbesian region","author":"BirdLife International","year":"2019"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cortex.2012.08.010"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1023\/A:1020352220487"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1111\/ics.12728"},{"key":"e_1_2_8_13_1","first-page":"165","article-title":"Ac\u00e9rca de disfun\u00e7\u00e3o pigmentar em Leontopithecus rosalia chrysomelas (Kuhl, 1820), seu tratamento e recupera\u00e7\u00e3o (Callitrichidae, Primates)","volume":"38","author":"Coimbra\u2010Filho A. 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