Incubation time as an important influence on egg production and distribution into clutches for sauropod dinosaurs

Ruxton, Graeme D. and Birchard, Geoffrey F. and Deeming, Charles (2014) Incubation time as an important influence on egg production and distribution into clutches for sauropod dinosaurs. Paleobiology, 40 (3). pp. 323-330. ISSN 0094-8373

Full content URL: http://dx.doi.org/10.1666/13028

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Abstract

Individual egg size and clutch size of the largest of the dinosaurs (the sauropods) are both smaller than might be expected for such large oviparous organisms. We suggest that these effects can be understood in the light of likely incubation times of sauropod eggs. Using allometric relationships from extant birds and crocodilians, we estimate that time from laying to hatching was likely to have been 65-82 days. If total predation risk varies with length of incubation time, there may be egg sizes above which the advantages of larger initial hatchling size are outweighed by the increased risk of predation during the egg stage. Also in seasonal environments there will often be a finite limit to the period over which environmental temperatures are high enough for egg development. Thus incubation time may have been an important constraint explaining the small individual size of sauropod eggs. We further suggest that for sauropods spatial dispersal of eggs in small clutches was an adaptive strategy to mitigate this high predation risk associated with long time of exposure in the egg stage. Such a dispersive strategy brings several benefits. Thus, incubation time may also be key to explaining the surprisingly small clutch sizes too.

Keywords:Dinosaur, Egg, Clutch size, Incubation, Sauropod, NotOAChecked
Subjects:F Physical Sciences > F641 Palaeontology
Divisions:College of Science > School of Life Sciences
ID Code:14001
Deposited On:18 May 2014 10:17

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