Klug
Fakultäten » Mathematisch-naturwissenschaftliche Fakultät » Paläontologisches Institut und Museum » PD Dr. Christian Klug » Klug
Current research project
| Title / Titel | Variability, Macroecology, Morphogenesis and Evolution of early Ammonoidea | ||||
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| Abstract (PDF, 14 KB) | |||||
| Summary / Zusammenfassung | Ammonoids represent one of the most extensively studied groups of extinct macroscopic animals. This fact roots in their high diversity and abundance which make them model organisms for evolutionary studies and valuable index fossils. Their huge diversity and abundance bears a great challenge for scientists: It will be hardly possible to ever study and understand all aspects of their evolution and biology. It is surprising that some aspects of ammonoid palaeobiology and evolution have still never or only rarely been studied. These are, e.g., empirical studies of changes in shell and chamber volumina and changes in intraspecific variability throughout evolution. Additionally, interactions between early ammonoid evolution and ecology are insufficiently known and will be topic of this project. Interactions between macroecology and evolution of early ammonoids occurred, e.g., during mass extinctions. Based on regional studies in various regions, sea-level changes, fluctuations in faunal assemblages, alterations in oxygenation and other ecological factors will be dated, assessed and tabled. Mass-occurrences, extinctions, diversification-events as well as major evolutionary innovations will then be correlated with the ecological events in order to find possible correlations. Correlations between ecological and evolutionary events might then give indications for ecological-evolutionary interactions. Endemism of Devonian ammonoids is low, which naturally improves their biostratigraphical value. This leads to the question where major subclades of early ammonoids have evolved. Existing data-bases will be used to plot occurrences of representatives of suborders or superfamilies either per zone or per substage on palaeogeographic maps in order to detect changes in their spatial distribution. Presuming the geographic range increased in time, the region of origin can be narrowed down to the corresponding region. These regions can then be compared in time and space, thus allowing to address the question for sym- or allopatric cladogenesis. Empirical 3D-models of ammonoids do exist already. They are based on CT-scans but usually characterised by a poor resolution. A high resolution can be achieved by producing serial sections. Four ammonoid specimens have already been sectioned successfully. Because of the usually insufficient contrast between shell and matrix, the shell-outline in these scanned sections were traced. Within this project, some additional specimens will be sectioned. Polygon-models will be produced of all specimens, making the measurement of chamber and septa volumina possible. These volumina will be measured throughout ontogeny as far as possible. Ontogenetic changes in these volumina will then be compared with each other and, presuming they are not identical, will be compared with respect to the phylogenetic position of the corresponding species. Additionally, the spacing of growth-related structures will be quantified and compared with the growth in volume. Ultimately, volumetric models for some of the sectioned specimens will be produced in order to test the hypothesis that ammonoids could attain neutral buoyancy by means of their shell. |
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| Publications / Publikationen | KORN, D., EBBIGHAUSEN, V., ARETZ, M. & KLUG, C. (2013, submitted): The Early Carboniferous succession in the vicinity of Gara el Itima. – In: El HASSANI, A.& BECKER, R. T. (Eds.): Excursion guidebook “The Devonian and Lower Carboniferous of northern Gondwana”. ca. 15 pp., Rabat.KLUG, C., KORN, D., NAGLIK, C., FREY, L. & DE BAETS, K. (2013, submitted): The Lochkovian to Eifelian succession of the Amessoui Syncline (southern Tafilalt) . – In: El HASSANI, A.& BECKER, R. T. (Eds.): Excursion guidebook “The Devonian and Lower Carboniferous of northern Gondwana”. ca. 10 pp., Rabat.TESSITORE, L., SCHEMM-GREGORY, M., KORN, D., WILD, F. R. W. P., NAGLIK, & C. KLUG, C. (2013, in press): Taphonomy and palaeoecology of the green pentamerid brachiopods from the Devonian of Aferdou el Mrakib, eastern Anti-Atlas, Morocco. – Swiss Journal of Palaeontology: 20 pp.DE BAETS, K., GOOLAERTS, S., RIETBERGEN, T. & KLUG, C. (2013, in press): The first record of Early Devonian ammonoids from Belgium and their significance. – Geologica Belgica, ca. 10 pp., Bruxelles.DE BAETS, K., KLUG, C., KORN, D., BARTELS, C. & POSCHMANN, M. (2013, in press): Early Emsian Ammonoidea and the age of the Hunsrück Slate (Rhenish Mountains, Western Germany). – Palaeontographica A: ca. 100 pp. + 10 pls., Stuttgart.KLUG, C., DE BAETS, K., NAGLIK, C. & WATERS, J. (2013, in press): New species of Tiaracrinus from the latest Emsian of Morocco. – Acta Palaeontologica Polonica: ca. 10 pp., Warszawa.68. DE BAETS, K., KLUG, C. & MONNET, C. (2013): Intraspecific variability through ontogeny in early ammonoids. – Paleobiology 39 (1): 75-94. Tulsa, Oklahoma.FRANCHI, F., SCHEMM-GREGORY, M. & KLUG, C. (2012): A new species of Ivdelinia Andronov, 1961 from the Moroccan Givetian and its palaeoecological and palaeobiogeographical implications. – Bulletin of Geosciences 1: 1-11, Praha.DE BAETS, K., KLUG, C., KORN, D., & LANDMAN, N. H. (2012): Evolutionary trends in ammonoid embryonal development. – Evolution, 1-19, Malden, Massachusetts.BERKOWSKI, B. & KLUG, C. (2012): Lucky rugose corals on crinoid stems – unusual examples of subepidermal epizoans from the Devonian of Hamar Laghdad (Morocco). Lethaia, 45: 24-33.SEUSS, B., MAPES, R. H., KLUG, C. & NÜTZEL, A. (2012): Exceptional cameral deposits in a sublethally injured Carboniferous orthoconic nautiloid from the Buckhorn Asphalt Lagerstätte in Oklahoma, USA. – Acta Palaeontologica Polonica 57 (2): 375–390; Warszawa.KORN, D. & KLUG, C. (2012): Palaeozoic ammonoids – diversity and development of conch morphology. – In: Extinction intervals and biogeographic perturbations through time: Earth and Life (International Year of Planet Earth). TALENT, J. (ed.), 491-534, (Springer) Netherlands.MONNET, C., KLUG, C., GOUDEMAND, N., BUCHER, H. & DE BAETS, K. (2011): Quantitative biochronology of Devonian ammonoids from Morocco and proposals for a refined unitary association method. – Lethaia, 44: 469-489, Oslo.SLOTTA, F., KLUG, C. & KEUPP, H. (2011): Sublethal shell injuries in Late Devonian ammonoids (Cephalopoda) from Kattensiepen (Rhenish Mountains). – Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 261 (3): 321-336; Stuttgart.DE BAETS, K., KLUG, C. & KORN, D. (2011): Devonian pearls and ammonoid-endoparasite coevolution. – Acta Palaeontologica Polonica, 56 (1): 159–180.MONNET, C., KLUG, C. & DE BAETS, K. (2011): Parallel evolution controlled by adaptation and covariation in ammonoid cephalopods. BMC Evolutionary Biology, 11 (115): 1-21. | ||||
| Keywords / Suchbegriffe | Ammonoidea, Devonian, buoyancy, palaeobiogeography, morphogenesis, growth | ||||
| Project leadership and contacts / Projektleitung und Kontakte |
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| Funding source(s) / Unterstützt durch |
SNF (Personen- und Projektförderung) |
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| In collaboration with / In Zusammenarbeit mit |
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| Duration of Project / Projektdauer | Feb 2011 to Jan 2014 |