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Non-Invasive Sex Determination of Nestlings and Adult Bonelli's Eagles Using Morphometrics

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Non-Invasive Sex Determination of Nestlings and Adult Bonelli's Eagles Using Morphometrics

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dc.contributor.author Estellés-Domingo, E.
dc.contributor.author López-López, P.
dc.date.accessioned 2023-04-05T07:41:29Z
dc.date.available 2023-04-05T07:41:29Z
dc.date.issued 2023
dc.identifier.citation Estellés-Domingo, E. López-López, P. 2023 Non-Invasive Sex Determination of Nestlings and Adult Bonelli's Eagles Using Morphometrics Animals 13 1201
dc.identifier.uri https://hdl.handle.net/10550/86037
dc.description.abstract Biometric analysis allows the sexing of most vertebrates, particularly birds. Birds of prey, and, especially, the Bonelli's eagle (Aquila fasciata), show reverse sexual dimorphism (i.e., females are usually larger than males). In contrast to blood sampling, the use of morphometrics allows sex determination using a non-invasive method, and, therefore, it facilitates fieldwork. By means of a linear discriminant analysis of biometric variables, we obtained different equations that allow the sexing of nestlings and adult Bonelli's eagles. We sampled 137 Bonelli's eagles, 82 nestlings and 55 adults in eastern Spain during the period 2015-2022. The sexes obtained after linear discriminant analysis were compared with their molecular sexing. The validation procedure of the linear discriminant equations facilitated the reduction of the number of variables used and, consequently, optimised working time and sexing accuracy. After validation, some equations showed a 100% sexing efficiency for Bonelli's eagles, particularly for adults. Our results showed that the variables with smaller overlap between the sexes were the lateral tarsus length and dorso-ventral tarsus length, particularly in nestlings. The rest of the variables showed some overlap between the sexes in both age classes. The results we obtained enable the sexing of juvenile and adult Bonelli's eagles in the field using just these two measurements. Hence, this is an easy, accurate, quick and non-invasive method with multiple applications, including in studies on population dynamics, survival analysis or extinction risk assessments, which, ultimately, could contribute to the improvement of the conservation status of this endangered species.
dc.relation.ispartof Animals, 2023, vol. 13, p. 1201
dc.subject Espècies (Biologia)
dc.subject Zoologia
dc.title Non-Invasive Sex Determination of Nestlings and Adult Bonelli's Eagles Using Morphometrics
dc.type journal article es_ES
dc.date.updated 2023-04-05T07:41:30Z
dc.identifier.doi 10.3390/ani13071201
dc.identifier.idgrec 157325
dc.rights.accessRights open access es_ES

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