Biometric variability and sexual size dimorphism in the Great Knot
            <i>Calidris tenuirostris</i>

Dorofeev, D.; Ivanov, A.; Khudyakova, E.; Verkuil, Y.; Piersma, T.; Meissner, W.

doi:10.1080/24750263.2023.2293120

The European Zoological Journal

2024

DOI: 10.1080/24750263.2023.2293120

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Biometric variability and sexual size dimorphism in the Great Knot Calidris tenuirostris

D. Dorofeev,

A. Ivanov,

E. Khudyakova

et al.

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2024

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Evaluation of the Effectiveness of Sex Determination in the Great Cormorant (Phalacrocorax carbo) Based on External Measurements

Meissner,

Goc,

Zaniewicz

2024

Animals

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The possibility of sex identification of birds has substantial importance for studies on different aspects of bird ecology and behaviour. Using discriminant functions is becoming increasingly popular in studies of bird species that are monomorphic in plumage characteristics because they are cheap, hardly invasive and may be applied to data collected in the past. In this paper, we provide a discriminant function to sex great cormorants using external measurements. Males were larger than females in all linear body measurements, but there were no significant differences between adults and juveniles. Thus, data on juveniles and adults within a sex was combined. Discriminant equations with the most commonly used linear measurements, wing length and bill length, were provided. If identifying birds with discriminant function values D2 < −1.256 as females and those with D2 > 0.916 as males, 99% of birds will be correctly sexed. The method presented here makes it possible to account for sex-specific patterns in ecological studies of the great cormorant and may be applied to data collected in the past. The cross-application of discriminant functions developed for other populations of the great cormorant produces a 5.4% and 7.5% misclassification rate for birds from northern Poland using discriminant equations developed for populations in Greece and the Netherlands, respectively.

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Evaluation of the Effectiveness of Sex Determination in the Great Cormorant (Phalacrocorax carbo) Based on External Measurements

Meissner,

Goc,

Zaniewicz

2024

Animals

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show abstract

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Biometric variability and sexual size dimorphism in the Great Knot Calidris tenuirostris

Cited by 1 publication

References 68 publications

Evaluation of the Effectiveness of Sex Determination in the Great Cormorant (Phalacrocorax carbo) Based on External Measurements

Evaluation of the Effectiveness of Sex Determination in the Great Cormorant (Phalacrocorax carbo) Based on External Measurements

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