Annual Variability and the Influence of Embryonic Development On Red-Shouldered Hawk (Buteo lineatus) Eggshell Characteristics
| Autor: | Indigo De Jong, William P. Brown, Julian Díaz |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Avian clutch size Embryogenesis 0402 animal and dairy science Buteo 04 agricultural and veterinary sciences Anatomy Biology biology.organism_classification 040201 dairy & animal science 010603 evolutionary biology 01 natural sciences Red-shouldered Hawk Animal science Blowhole (anatomy) embryonic structures Animal Science and Zoology Eggshell |
| Zdroj: | Journal of Raptor Research. 51:61-67 |
| ISSN: | 2162-4569 0892-1016 |
| DOI: | 10.3356/jrr-16-00009.1 |
| Popis: | Red-shouldered Hawk (Buteo lineatus) eggs were examined to determine whether mass, eggshell thickness, and a thickness index corrected for egg shape and blowhole size changed as embryos developed. Four different stages of embryonic development (fresh, slight, large, and advanced) were described by the collector (C.F. Stone), or inferred from blowhole diameter measurements, for 286 Red-shouldered Hawk eggs collected in the late 1800s and early 1900s in central New York State. We examined changes in eggshell mass, thickness, and thickness index with linear mixed models with year of collection and clutch size specified as random variables. We also evaluated annual differences in eggshell characteristics with linear mixed models. There was an 8.8% decrease in eggshell mass between eggs with fresh and advanced embryos at the time of collection (F3,242 = 3.4, P = 0.02). Eggshell thickness tended to decrease by 7.5% between eggs with fresh and advanced embryos, but the difference was not significant (F3... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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