龙嘴巨嘴鸟的形态特征及其与性别的关系

IF 0.2 4区生物学 Q4 ORNITHOLOGY

Ornitologia Neotropical Pub Date : 2023-11-13 DOI:10.58843/ornneo.v34i2.1233

Danielle Erin Leeman Suástegui, Ubaldo Márquez-Luna, Carlos Vásquez, Blanca Valladares Riverol, Josué Garduño Ruiz, Annuar Majluf Trejo

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引用次数: 0

摘要

在保护计划中，雌雄同体的鸟类对繁殖至关重要。在巨嘴鸟(巨嘴鸟)物种中，雄性的喙比雌性的长，这使得喙的形态测定法可能对性别测定有用。在这项研究中，我们测量了44只龙嘴巨嘴鸟的以下特征:弯曲喙长、总喙长、直喙长、牙膜腹侧线的弯曲和直线长度、喙宽、鼻鞘外侧面积和肛管开口，以及先前报道的另外17只个体的形态测量数据。采用人工和图像处理软件两种方法进行测量，并采用类内相关系数(ICC)评估两种方法之间的可靠性。性别未知的个体通过PCR检测进行性别鉴定。ICC在两种测量方法之间显示出较差的可靠性，因此我们只使用人工测量来比较性别之间的差异。我们使用glmm来确定我们测量的形态特征是否可以用来确定龙骨嘴巨嘴鸟的性别。此外，我们评估了glmm，以确定哪种形态计量性状是该物种性别的最强预测因子。成年雄性的喙长大于雌性。glmm分析结果表明，与性别相关的喙部性状主要有喙弯长、喙直长、喙腹直长和喙总长。在龙骨嘴巨嘴鸟中，齿骨骨腹线的直线长度是最强的性别预测器。与之前的研究不同，glmm的发展使我们能够基于连续变量确定巨嘴鸟性别的概率，促进了性别鉴定，并使我们能够评估每只巨嘴鸟性别估计的可靠性。在无法执行其他性别鉴定方法的情况下，此方法是一种替代方法。

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MORPHOMETRIC TRAITS AND THEIR ASSOCIATION WITH SEX IN THE KEEL-BILLED TOUCAN RAMPHASTOS SULFURATUS

Sexing monomorphic birds is essential for reproduction in conservation programs. In ramphastids (toucans) species, males have longer beaks than females, making beak morphometry potentially useful for sexing. In this study, we measured the following traits: curved beak length, total culmen length, straight beak length, curved and straight length of the ventral line of the gnathotheca, beak width, lateral area of the rhinotheca, and cloacal opening in 44 Keel-billed Toucans, as well as previously reported morphometric data from 17 additional individuals. Measurements were obtained using two methods (manual and image processing software), and the reliability between the two methods was assessed using the intraclass correlation coefficient (ICC). Individuals of unknown sex were sexed via PCR tests. The ICC showed poor reliability between the two measurement methods, so we only used manual measurements for comparisons between the sexes. We used GLMMs to determine whether the morphometric traits we measured could be used to determine sex in keel-billed toucans. In addition, we evaluated GLMMs to determine which morphometric trait was the strongest predictor of sex in this species. Beak length was longer in adult males than in females. The GLMMs indicated that beak traits associated with sex in this species are beak curved length, beak straight length, straight length of the ventral line of the gnathotheca, and total culmen length. The straight length of the ventral line of the gnathotheca was the strongest predictor of sex in the Keel-billed Toucan. Unlike previous research, the development of GLMMs allows us to determine the probability of a toucan’s sex based on continuous variables, facilitating sexing and allowing us to evaluate the reliability of the estimation of the sexing of each toucan. This method is an alternative for situations where other sexing methodologies cannot be performed.

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来源期刊

Ornitologia Neotropical 生物-鸟类学

CiteScore

0.50

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Ornitología Neotropical welcomes high quality manuscripts concerning ornithological research in the Neotropical region, which includes from Mexico south to Argentina and Chile. Papers on Neotropical species in adjacent areas may be considered at the discretion of the editorial board. While the journal has currently a strong emphasis on natural history, all aspects of avian research are of potential interest. Range extensions and first country records of species are best published in national journals unless the findings have broad implications for the Neotropical region.