Evaluation of the Effectiveness of Sex Determination in the Great Cormorant (Phalacrocorax carbo) Based on External Measurements
Abstract
:Simple Summary
Abstract
1. Introduction
2. Materials and Methods
2.1. Ageing and Morphometric Measurements
2.2. Statistical Analysis
3. Results
4. Discussion
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Measurement [mm] | Males | Females | t-Test | SDI | |||||
---|---|---|---|---|---|---|---|---|---|
Mean | V | N | Mean | V | N | t | p | ||
Wing length | 352.8 | 2.1% | 218 | 332.2 | 2.7% | 139 | 24.24 | p < 0.001 | 6.2% |
Bill length | 70.60 | 4.4% | 188 | 63.53 | 5.2% | 109 | 18.97 | p < 0.001 | 11.1% |
Maximum bill depth | 14.51 | 5.5% | 188 | 12.91 | 6.9% | 111 | 15.78 | p < 0.001 | 12.4% |
Minimum bill depth | 13.26 | 4.9% | 147 | 11.70 | 5.2% | 89 | 18.16 | p < 0.001 | 13.3% |
Tarsus length | 69.19 | 3.8% | 109 | 64.73 | 3.8% | 72 | 11.51 | p < 0.001 | 6.9% |
Equation | Correctly Sexed | ||
---|---|---|---|
Males | Females | All | |
D1 = 0.073·WL + 0.082·BL + 0.785·MBD − 40.623 | 95.4% | 91.5% | 93.9% |
D2 = 0.087·WL + 0.161·BL − 40.843 | 96.3% | 91.3% | 93.8% |
Population | Equation | Correctly Sexed | ||
---|---|---|---|---|
Males | Females | All | ||
Greece | D = 0.073·WL + 0.123·BL + 0.310·TL − 53.693 | 94.2% | 95.1% | 94.6% |
The Netherlands | D = 0.086·WL + 0.148·BL − 39.869 | 89.6% | 96.6% | 92.5% |
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Meissner, W.; Goc, M.; Zaniewicz, G. Evaluation of the Effectiveness of Sex Determination in the Great Cormorant (Phalacrocorax carbo) Based on External Measurements. Animals 2024, 14, 2389. https://doi.org/10.3390/ani14162389
Meissner W, Goc M, Zaniewicz G. Evaluation of the Effectiveness of Sex Determination in the Great Cormorant (Phalacrocorax carbo) Based on External Measurements. Animals. 2024; 14(16):2389. https://doi.org/10.3390/ani14162389
Chicago/Turabian StyleMeissner, Włodzimierz, Michał Goc, and Grzegorz Zaniewicz. 2024. "Evaluation of the Effectiveness of Sex Determination in the Great Cormorant (Phalacrocorax carbo) Based on External Measurements" Animals 14, no. 16: 2389. https://doi.org/10.3390/ani14162389