Shell mass, thickness and density of avian eggs derived from the tables of Schönwetter

Autor:	Hermann Rahn, Charles V. Paganelli
Rok vydání:	1989
Předmět:	Paleontology embryonic structures Shell (structure) Analytical chemistry Animal Science and Zoology Order Galliformes Eggshell Biology Breaking strength
Zdroj:	Journal für Ornithologie. 130:59-68
ISSN:	1439-0361 0021-8375
DOI:	10.1007/bf01647162
Popis:	Presented are regression equations of shell thickness and shell mass as a function of egg mass for non-passerine (n=3217) and passerine species (n=3929) taken from the tables ofSchonwetter. These regressions reveal many species of the order Galliformes that exhibit unusually thick shells and have a relative shell mass which can exceed 20% of their egg mass. Shell density (g/cm3) was calculated for all eggs and their frequency distribution plotted. Mean values for non-passerine and passerine eggs are 2.02 and 2.05 g/cm3, respectively. The breaking strength of eggs as related to shell thickness is discussed. The regressions of exoskeletal, endoskeletal, and eggshell mass on body or egg mass are all shown to have the same slope.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b7fbdce0ea6db04ae604bb6d8e3c4847 https://doi.org/10.1007/bf01647162 Zobrazit plný text záznamu Full text from SpringerLink