Materials and Methods Tables S1 to S5 References Materials and Methods
Extant Taxa. A variety of sources provided the data for the plots and analysis of clutch volume versus body mass by parental care strategy (Fig. 1A, Tables S1, S2, S5). Egg dimensions and parental incubation and/or nest guarding for modern birds primarily came from Walters (S1). Additional sources p...
| Main Authors: | , , , , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.177.8426 http://www.sciencemag.org/cgi/data/322/5909/1826/DC1/1/ |
| Summary: | Extant Taxa. A variety of sources provided the data for the plots and analysis of clutch volume versus body mass by parental care strategy (Fig. 1A, Tables S1, S2, S5). Egg dimensions and parental incubation and/or nest guarding for modern birds primarily came from Walters (S1). Additional sources provided information on megapodes (S2), ratites and tinamous (S3), Actitis macularius (S4), and Monias benschi (S5). For adult avian weight we used the species average or the average of both sexes as reported in the above references or in Dunning where available (S6). Clutch volume was calculated using the equation for avian egg volume, V = 0.51 L x D 2, where L = egg length and D = egg diameter (S7), multiplied by the average number of eggs per clutch (S1). In a few instances, e.g. Jacana jacana, Eudromias morinellus, and Phalaropus lobatus, clutch mass data (S8) was converted to clutch volume using a standard bird egg density of 1.06 g/cm 3 (S9), which matches an average of egg density for 28 extant avian species (S10). Ferguson (S11) provides egg dimensions for extant crocodilians. Egg volume was calculated using the equation for an ellipse (V = 0.524 L x D 2). Data on crocodilian eggs per clutch and adult female weights came from Thorbjarnarson (S12). Trutnau and Sommerlad (S13) provided data on Caiman yacare and Osteolaemus tetraspis. For three |
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