Characterization of the sexual dimorphism in oilbirds (Steatornis caripensis)

Robayo Salek, Andrés Felipe

doi:https://doi.org/10.48713/10336_34812

Ítem

Acceso Abierto

Characterization of the sexual dimorphism in oilbirds (Steatornis caripensis)

Mostrar el registro sencillo de la publicación

dc.contributor.advisor	Maldonado Chaparro, Adriana Alexandra
dc.creator	Robayo Salek, Andrés Felipe
dc.creator.degree	Biólogo	es
dc.creator.degreeLevel	Pregrado
dc.creator.degreetype	Full time	es
dc.date.accessioned	2022-08-26T22:24:53Z
dc.date.available	2022-08-26T22:24:53Z
dc.date.created	2022-08
dc.description	The extent to which males and females of monomorphic species differ from each other is still an ecological and evolutionary puzzle. In these species it has been proposed that slight differences in selection pressures can result in phenotypic differences between sexes. However, such differences may be very subtle or may be exhibited in traits that are not perceived by humans, such as coloration. For example, in blue tits (Cyanistes caeruleus) males differ from females in the UV reflection of the crown patch. Here, I aimed to identify the morphological differences between sexes in a monomorphic specie, the oilbird (Steatornis caripensis). In this species, males are slightly larger and grayish than females, making it difficult to determine the sex of individuals by means other than molecular sexing, an invasive technique. To characterize phenotypic differences between males and females, I measured five morphological traits on 75 museum individuals and 16 wild individuals, and the feather coloration in 33 museum individuals and 11 wild individuals. I used these measures to quantify the degree of sexual dimorphism and identify the traits that differentiate males from females. I found that S. caripensis is mostly monomorphic showing subtle differences in the width and the length of the bill, which is larger in males compared to females. I also found subtle differences in plumage coloration suggesting that color may play an important role in the differentiation of the sexes, and possibly in mate choice. My results indicate that despite the slight differences in beak shape between males and females, the sexes in oilbirds seem to be indistinguishable.	es
dc.description.abstract	The extent to which males and females of monomorphic species differ from each other is still an ecological and evolutionary puzzle. In these species it has been proposed that slight differences in selection pressures can result in phenotypic differences between sexes. However, such differences may be very subtle or may be exhibited in traits that are not perceived by humans, such as coloration. For example, in blue tits (Cyanistes caeruleus) males differ from females in the UV reflection of the crown patch. Here, I aimed to identify the morphological differences between sexes in a monomorphic specie, the oilbird (Steatornis caripensis). In this species, males are slightly larger and grayish than females, making it difficult to determine the sex of individuals by means other than molecular sexing, an invasive technique. To characterize phenotypic differences between males and females, I measured five morphological traits on 75 museum individuals and 16 wild individuals, and the feather coloration in 33 museum individuals and 11 wild individuals. I used these measures to quantify the degree of sexual dimorphism and identify the traits that differentiate males from females. I found that S. caripensis is mostly monomorphic showing subtle differences in the width and the length of the bill, which is larger in males compared to females. I also found subtle differences in plumage coloration suggesting that color may play an important role in the differentiation of the sexes, and possibly in mate choice. My results indicate that despite the slight differences in beak shape between males and females, the sexes in oilbirds seem to be indistinguishable.	es
dc.description.sponsorship	Universidad del Rosario	es
dc.format.extent	22 pp	es
dc.format.mimetype	application/pdf	es
dc.identifier.doi	https://doi.org/10.48713/10336_34812
dc.identifier.uri	https://repository.urosario.edu.co/handle/10336/34812
dc.language.iso	eng	es
dc.publisher	Universidad del Rosario
dc.publisher.department	Facultad de Ciencias Naturales
dc.publisher.program	Biología
dc.rights	Atribución-NoComercial-SinDerivadas 2.5 Colombia	*
dc.rights.accesRights	info:eu-repo/semantics/openAccess	es
dc.rights.acceso	Abierto (Texto Completo)	es
dc.rights.licencia	EL AUTOR, manifiesta que la obra objeto de la presente autorización es original y la realizó sin violar o usurpar derechos de autor de terceros, por lo tanto la obra es de exclusiva autoría y tiene la titularidad sobre la misma.	spa
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/2.5/co/	*
dc.source.bibliographicCitation	Amadon, D. (1959). The Significance of Sexual Differences in Size among Birds. Proceedings of the American Philosophical Society, 103(4), 531-536.	es
dc.source.bibliographicCitation	Andersson, S., örnborg, J., & Andersson, M. (1998a). Ultraviolet sexual dimorphism and assortative mating in blue tits. Proceedings of the Royal Society of London. Series B: Biological Sciences, 265(1395), 445-450. https://doi.org/10.1098/rspb.1998.0315	es
dc.source.bibliographicCitation	Andersson, S., örnborg, J., & Andersson, M. (1998b). Ultraviolet sexual dimorphism and assortative mating in blue tits. Proceedings of the Royal Society of London. Series B: Biological Sciences, 265(1395), 445-450. https://doi.org/10.1098/rspb.1998.0315	es
dc.source.bibliographicCitation	Badyaev, A. V., & Hill, G. E. (2003). Avian Sexual Dichromatism in Relation to Phylogeny and Ecology. Annual Review of Ecology, Evolution, and Systematics, 34(1), 27-49. https://doi.org/10.1146/annurev.ecolsys.34.011802.132441	es
dc.source.bibliographicCitation	Bennett, A. T. D., Cuthill, I. C., & Norris, K. J. (1994). Sexual Selection and the Mismeasure of Color. The American Naturalist, 144(5), 848-860. https://doi.org/10.1086/285711	es
dc.source.bibliographicCitation	Bergeron, Z. T., & Fuller, R. C. (2018). Using Human Vision to Detect Variation in Avian Coloration: How Bad Is It? The American Naturalist, 191(2), 269-276. https://doi.org/10.1086/695282	es
dc.source.bibliographicCitation	Biagolini-Jr, C., & Perrella, D. F. (2020). Bright coloration of male blue manakin is not connected to higher rates of nest predation. Acta Ethologica, 23(3), 183-191. https://doi.org/10.1007/s10211-020-00352-9	es
dc.source.bibliographicCitation	Birkhead, T. R. (1998). Sexual selection in the zebra ®nch Taeniopygia guttata: Condition, sex traits and immune capacity. 13	es
dc.source.bibliographicCitation	Björklund, M. (1984). The Adaptive Significance of Sexual Indistinguishability in Birds: A Critique of a Recent Hypothesis. Oikos, 43(3), 414. https://doi.org/10.2307/3544167	es
dc.source.instname	instname:Universidad del Rosario
dc.source.reponame	reponame:Repositorio Institucional EdocUR
dc.subject	Selección sexual	es
dc.subject	Especies monomórficas	es
dc.subject	Sexado molecular	es
dc.subject.ddc	Biología	es
dc.subject.keyword	Sexual selection	es
dc.subject.keyword	Monomorphic species	es
dc.subject.keyword	Molecular sexing	es
dc.title	Characterization of the sexual dimorphism in oilbirds (Steatornis caripensis)	es
dc.title.TranslatedTitle	Caracterización del dimorfismo sexual en guácharos (Steatornis caripensis)	es
dc.type	bachelorThesis	es
dc.type.document	Artículo	es
dc.type.hasVersion	info:eu-repo/semantics/acceptedVersion
dc.type.spa	Trabajo de grado	es