Global Geology 2016, 19(4) 241-254 DOI:     ISSN: 1673-9736 CN: 22-1371/P

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Keywords
Maastrichtian
arctic
ecosystems
climate
dinosaur
reproduction
Authors
Robert A.Spicer
Alexei B.Herman
Romain Amiot and Teresa E.V.Spicer
PubMed
Article by Robert A.Spicer
Article by Alexei B.Herman
Article by Romain Amiot and Teresa E.V.Spicer

Environmental adaptations and constraints on latest Cretaceous Arctic dinosaurs

Robert A.Spicer, Alexei B.Herman, Romain Amiot and Teresa E.V.Spicer

1. School of Environment,Earth and Ecosystem Sciences,Open University,Milton Keynes,MK7 6AA,UK; 2. Geological Institute,Russian Academy of Sciences,119017 Moscow,Russia; 3. Claude Bernard University of Lyon 1 and High Normal School of Lyon,Dubois,69622 Villeurbanne Cedex,France; 4. State Key Laboratory of Systematic and Evolutionary Botany,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China

Abstract

The Arctic hosts an extraordinary wealth of terrestrial fossil biotas of Late Cretaceous age representing a diverse and highly productive near-polar ecosystem that has no modern analogue. Compared to the rest of the Late Cretaceous Maastrichtian plant diversity was at its lowest and the temperature regime the coolest,yet the semi-open forests supported a rich dinosaur fauna made up of a wide range of body sizes and feeding strategies. The combination of mild winter temperatures and continuous darkness lasting several months imposed severe constraints on primary productivity. Plant survival strategies involved almost universal winter loss of foliage, which in turn limited food supply for non-migratory overwintering herbivorous animals. A combination of leaf form and tree ring studies has been used to quantify year round variations in temperature and determine the tim- ing of spring bud-break and autumnal leaf fall. While Maastrichtian winter temperatures were cold enough (down to - 10℃ for brief intervals) for frequent frosts and snowfall,summer temperatures were cool but highly variable and at ~ 83°N along the north Alaskan coast frequently fell below + 10℃ . Theropod egg shell frag- ments at ~ 76°N in the Maastrichtian of Northeastern Russia may indicate that dinosaur reproduction took place in the Arctic ecosystem,as distinct from taking place at lower latitude breeding grounds reached by migration. This raises the question of nest management and specifically the maintenance of incubation temperatures,and the duration of incubation. Of critical importance to year-round residency is the timing of hatching and juvenile care before winter darkness set in,temperatures fell to near freezing and food resources became limited.

Keywords Maastrichtian   arctic   ecosystems   climate   dinosaur   reproduction  
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