Estimating egg mass–body mass relationships in birds
نویسندگان
چکیده
منابع مشابه
Allometric relationships between embryonic heart rate and fresh egg mass in birds.
Previously, we have measured daily changes (developmental patterns) in embryonic heart rate (fh) in altricial and semi-altricial (ASA) birds (range of mean fresh egg mass approximately 1-20 g), semi-precocial seabirds (egg mass approximately 38-288 g) and precocial birds (egg mass approximately 6-1400 g). An allometric relationship between embryonic fh at 80 % of incubation duration (ID) and fr...
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The production of eggs can make a major nutritional demand on a female bird. The scale of the required investment varies between species, depending on the size of each egg and the number of eggs laid. For large species, where egg weight is a small proportion of female body mass, the investment in the egg is small, but in some passerines the female will lay a clutch that weighs more than her own...
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—Measures of repeatability have long been used to assess patterns of variation in egg size within and among females. We compared different analytical approaches for estimating repeatability of egg size of Black Brant. Separate estimates of repeatability for eggs of each clutch size and laying sequence number varied from 0.49 to 0.64. We suggest that using the averaging egg size within clutches ...
متن کاملRelationships between Birds and Deer
The purpose of this paper is to discuss the relationships that exist between birds and the mule deer (Odqcoileus he&onus). From July, 1947, until January, 19.50, I had the good fortune to live with a population of migratory deer in the central 6ierra Nevada of California between Yosemite National Park and the Sonora Pass Road. This population, wintering on Jawbone Ridge, is known as the Jawbone...
متن کاملOsmotic Relationships in the Hen's Egg
Data have been given to illustrate the difficulty of obtaining consistent freezing point data with a viscous fluid such as the yolk of the hen's egg and a technique has been described for obtaining reproducible and accurate results consistently. Further freezing point data have been given which were obtained with both fertile and unfertile hen's eggs by the use of a freezing point method previo...
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ژورنال
عنوان ژورنال: The Auk
سال: 2020
ISSN: 0004-8038,1938-4254
DOI: 10.1093/auk/ukaa019