Atmospheric carbon dioxide/oxygen imbalance in the late Cretaceous, hatching of eggs and the extinction of biota

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dc.contributor.authorOelofsen, B. W.
dc.date.accessioned2015-01-08T10:13:11Z
dc.date.available2015-01-08T10:13:11Z
dc.date.issued1978
dc.descriptionMain articleen_ZA
dc.description.abstractA new theory explains why dinosaurs, pterosaurs and large avian species like Hesperornis became extinct at the end of the Cretaceous while mammals, smaller Cretaceous birds, crocodiles, chelonians and saurians survived . An atmospheric carbon dioxide/oxygen imbalance at the end of the Cretaceous caused by kimberlite volcanism, basalt flows and a reduction in oxygen production by marine phytoplankton is proposed. The unfavourable area to volume ratio of large eggs for diffusion of respiratory gases compared to that of small eggs resulted in the asphyxiation of the embryos of large endothermic egg laying groups. Endothermic species, e.g. dinosaurs that covered their eggs with soil, restricted the free circulation of air and would have been first to become extinct. Smaller ectothermic species, e.g. crocodiles, chelonians and saurians with lower embryonic respiratory requirements and endothermic species like the birds that did not cover their eggs, survived.en_ZA
dc.description.sponsorshipNoneen_ZA
dc.identifier.citationNoneen_ZA
dc.identifier.issn0078-8554
dc.identifier.urihttp://hdl.handle.net/10539/16263
dc.language.isoenen_ZA
dc.publisherBernard Price Institute for Palaeontological Researchen_ZA
dc.relation.ispartofseriesNone;
dc.subjectDinosaur; Cretaceous; Eggs; Extinction; Atmosphericen_ZA
dc.titleAtmospheric carbon dioxide/oxygen imbalance in the late Cretaceous, hatching of eggs and the extinction of biotaen_ZA
dc.typeArticleen_ZA
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Volume 21 1978