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Dietary and environmental implications of Early Cretaceous predatory dinosaur coprolites from Teruel, Spain
Swedish Museum of Natural History, Department of Paleobiology. Department of Geology, Lund University, Sweden.ORCID iD: 0000-0003-2987-5559
Fundación Conjunto Paleontológico de Teruel-Dinópolis/Museo Aragonés de Paleontología.
ERNO, Instituto de Geología, UNAM, L.D. Colosio y Madrid.
Dept of Physical Geography and Ecosystems Science, Lund University.
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2016 (English)In: Palaeogeography, Palaeoclimatology, Palaeoecology, ISSN 0031-0182, E-ISSN 1872-616X, Vol. 464, 134-142 p.Article in journal (Refereed) Published
Abstract [en]

Coprolites from the Early Cretaceous vertebrate bone-bed at Ariño in Teruel, Spain, were analyzed geochemically and palynologically. They contain various inclusions, such as small bone fragments, abundant plant remains, pollen, and spores. We attribute the coprolites to carnivorous dinosaurs based partly on their morphology together with the presence of bone fragments, and a high content of calcium phosphate (hydroxylapatite) with calcite.Well-preserved pollen and spore assemblages were identified in all coprolite samples and a slightly poorer assemblage was obtained from the adjacent sediments, both indicating an Early Cretaceous (Albian) age. This shows that the coprolites are in situ and also confirms previous age determinations for the host strata. The depositional environment is interpreted as a continental wetland based on the palynoflora, which includes several hydrophilic taxa, together with sparse occurrences of fresh-water algae, such as Ovoidites, and the absence of marine palynomorphs. Although the coprolites of Ariño samples generally are dominated by pollen produced by Taxodiaceae (cypress) and Cheirolepidiaceae (a family of extinct conifers), the sediment samples have a slightly higher relative abundance of fern spores. The distribution of major organic components varies between the coprolite and sediment samples, which is manifest by the considerably higher charcoal percentage within the coprolites. The high quantities of charcoal might be explained by a ground-dwelling species, feeding on smaller vertebrates that complemented its diet with plant material from a paleoenvironment were wild fires were a part of the ecosystem. The state of preservation of the spores and pollen is also more detailed in the coprolites, suggesting that encasement in calcium phosphate may inhibit degradation of sporopollenin.

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2016. Vol. 464, 134-142 p.
Keyword [en]
Coprolite, Teruel, Cretaceous, Palynology, Charcoal, Wild fires
National Category
Other Earth and Related Environmental Sciences
Research subject
Ecosystems and species history
Identifiers
URN: urn:nbn:se:nrm:diva-2053DOI: doi.org/10.1016/j.palaeo.2016.02.036OAI: oai:DiVA.org:nrm-2053DiVA: diva2:1055057
Projects
2015-04264 Utgör mass-utdöenden en driftkraft för evolutionen? Studier från krita-paleogengränsenSwedish Research Council 349-2007-8705 Lund University Carbon Cycle Centre (LUCCI)
Funder
Swedish Research Council, 2015-04264Swedish Research Council, 349-2007-8705
Available from: 2016-12-10 Created: 2016-12-10 Last updated: 2017-11-29Bibliographically approved

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Publisher's full texthttp://dx.doi.org/10.1016/j.palaeo.2016.02.036

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