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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 5 (1987), S. 0 
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    International journal of earth sciences 68 (1979), S. 876-893 
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Abstract According to Stereoscan Electron Microscope Studies of the Upper Jurassic (Tithonian) Solnhofen limestone (Southern Franconia) and of the Oberalm limestone (Northern Calcareous Alps) similar diagenetic criteria can be recognized in the alterations of the coccolith morphology. In contrast to the various solution- and precipitation patterns formed during the sedimentation of the ultraplancton, on the sea-floor or in the sediment (see fig. 1) no differentiation can be made with regard to the submicroscopic criteria caused by diagenetic processes in different environments (Solnhofen: subtidal lagoon with alternating hypersaline conditions with growth of blue-green-algal mats and normal marine water conditions with the sedimentation of ultraplancton. — Oberalm: bathyal basin with strongly burrowed soft bottoms and common sedimentation of ultraplancton).
    Abstract: Résumé Les études par S.E.M. des calcaires en minces bancs de Solenhofen (sédiment lagunaire) et des calcaires d'Oberalm (sédiment bathyal) montrent des transformations diagénétiques sensiblement les mÊmes dans la morphologie des coccolithes. La multiplicité des processus de dissolution et de précipitation pouvant intervenir au cours de la sédimentation sur le fond de la mer et dans le sédiment, apparaissent comme s'homogénéisant dans ces deux calcaires du Mahn provenant de domaines paléogéographiques différents.
    Notes: Zusammenfassung Rasterelektronenmikroskopische Untersuchungen der Solnhofener Plattenkalke (Lagunensediment) und der Oberalmer Kalke (bathyale Sedimente) zeigen weitgehend ähnliche diagenetische Veränderungen der Coccolithen-Morphologie. Die Vielfalt der während der Sedimentation, am Meersboden und im Sediment möglichen Lösungs- und Abscheidungsvorgänge (siehe Abb. 1) erscheinen in den beiden, aus unterschiedlichen paläogeographischen Bereichen stammenden Malm-Kalken homogenisiert.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2022-07-19
    Description: Several non-invasive methods are common practice in natural sciences today. Here we present how they can be applied and contribute to current topics in cephalopod (paleo-) biology. Different methods will be compared in terms of time necessary to acquire the data, amount of data, accuracy/resolution, minimum/maximum size of objects that can be studied, the degree of post-processing needed and availability. The main application of the methods is seen in morphometry and volumetry of cephalopod shells. In particular we present a method for precise buoyancy calculation. Therefore, cephalopod shells were scanned together with different reference bodies, an approach developed in medical sciences. It is necessary to know the volume of the reference bodies, which should have similar absorption properties like the object of interest. Exact volumes can be obtained from surface scanning. Depending on the dimensions of the study object different computed tomography techniques were applied.
    Language: English
    Type: reportzib , doc-type:preprint
    Format: application/pdf
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  • 4
    Publication Date: 2022-07-19
    Description: Several non-invasive methods are common practice in natural sciences today. Here we present how they can be applied and contribute to current topics in cephalopod (paleo-) biology. Different methods will be compared in terms of time necessary to acquire the data, amount of data, accuracy/resolution, minimum/maximum size of objects that can be studied, the degree of post-processing needed and availability. The main application of the methods is seen in morphometry and volumetry of cephalopod shells. In particular we present a method for precise buoyancy calculation. Therefore, cephalopod shells were scanned together with different reference bodies, an approach developed in medical sciences. It is necessary to know the volume of the reference bodies, which should have similar absorption properties like the object of interest. Exact volumes can be obtained from surface scanning. Depending on the dimensions of the study object different computed tomography techniques were applied.
    Language: English
    Type: article , doc-type:article
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  • 5
    Publication Date: 2022-07-19
    Description: Here, we report on different types of shell pathologies of the enigmatic deep-sea (mesopelagic) cephalopod Spirula spirula. For the first time, we apply non-invasive imaging methods to: document trauma-induced changes in shell shapes, reconstruct the different causes and effects of these pathologies, unravel the etiology, and attempt to quantify the efficiency of the buoyancy apparatus. We have analysed 2D and 3D shell parameters from eleven shells collected as beach findings from the Canary Islands (Gran Canaria and Fuerteventura), West-Australia, and the Maldives. All shells were scanned with a nanotom-m computer tomograph. Seven shells were likely injured by predator attacks: fishes, cephalopods or crustaceans, one specimen was infested by an endoparasite (potentially Digenea) and one shell shows signs of inflammation and one shell shows large fluctuations of chamber volumes without any signs of pathology. These fluctuations are potential indicators of a stressed environment. Pathological shells represent the most deviant morphologies of a single species and can therefore be regarded as morphological end-members. The changes in the shell volume / chamber volume ratio were assessed in order to evaluate the functional tolerance of the buoyancy apparatus showing that these had little effect.
    Language: English
    Type: article , doc-type:article
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