Essays about: "shark teeth"

Showing result 1 - 5 of 7 essays containing the words shark teeth.

1. 1. Exploring the physiological variables of oxygen isotope composition in chondrychthyan teeth

   University essay from Uppsala universitet/Institutionen för biologisk grundutbildning; Uppsala universitet/Institutionen för organismbiologi; Uppsala universitet/Evolutionsbiologi

   Author : Carlos Oliveira; [2019]
   Keywords : chondrichthyan; oxygen; isotope; fractionation; teeth; enameloid; dentine;

   Abstract : Since the discoveries of vertebrate bioapatite’s ability to record oxygen isotopecomposition of ambient seawater were made (Kolodny, 1983), oxygen isotopes have beenwidely used as a climatic and oceanographic proxy. The δ18OP aquatic vertebrate apatite isa function of the δ18Ow value of the ambient water, yet “vital effects” on the δ18OP compositionhave been reported previously (Venneman et al. READ MORE

3. 2. Oxygen isotope composition (δ18O) in Sandbar Shark teeth as a proxy to environment : developmental and morphofunctional variability

   University essay from Uppsala universitet/Institutionen för biologisk grundutbildning

   Author : Junyu Chen; [2019]
   Keywords : Oxygen isotopes; Sandbar Shark; enameloid; shark teeth;

   Abstract : Oxygen isotope composition is a well-known environmental proxy, studied in both fossil and living organisms. In this research project, the ratio of δ18O was studied in the biomineral of enameloid tissue of Sandbar Shark teeth. All the sharks were kept in the tropical ocean tank of the Blackpool Sea Life Center (UK). READ MORE

4. 3. Dynamics of Selachian (Shark) Dental Morphology During the Early Mesozoic

   University essay from Uppsala universitet/Institutionen för geovetenskaper

   Author : Alexander Paxinos; [2017]
   Keywords : Early Mesozoic; Selachii; morphological disparity; geometric morphometrics; early radiation; Tidig Mesozoisk; Selachimorpha; morfologisk disparitet; geometrisk morfometri; tidig strålning;

   Abstract : The ancestors of all modern day sharks and rays (Neoselachii) may have appeared during the Late Palaeozoic, but their major diversification happened sometime during the Early Mesozoic. Taxonomic evidence places the first neoselachian diversification in the Early Jurassic. READ MORE

5. 4. Disparity of Early Cretaceous Lamniformes sharks

   University essay from Uppsala universitet/Institutionen för geovetenskaper

   Author : Fredrik Söderblom; [2015]
   Keywords : Lamniformes; disparity; Early Cretaceous; morphology; morphometric; Lamniformes; disparitet; tidig krita; morfologi; morfometri;

   Abstract : The geological range of lamniform sharks stretches from present day species such as Carcharodon carcharias (great white shark) back to the at the moment oldest undoubted fossil finds during the Early Cretaceous. In this paper a geometric morphometric analysis was performed on images of Early Cretaceous lamniform teeth collected from published literature in order to examine the change in disparity (range of morphological variation within a group) throughout the time period. READ MORE

6. 5. Paleoecology and sedimentology of the Upper Cretaceous (Campanian), marine strata at Åsen, Kristianstad Basin, Southern Sweden, Scania

   University essay from Lunds universitet/Geologiska institutionen

   Author : Faisal Javed Iqbal; [2013]
   Keywords : Campanian; Belemnellocamax mammilatus Zone; Belemnellocamax balsvikensis Zone; Brachiopods; Bivalves; Belemnites; Bryozoans; Barnacle; Sea urchin; corals; coprolites; shark teeth; vertebrate fossils; XRF; Sr Ca; Steinkern; Earth and Environmental Sciences;

   Abstract : The Campanian marine strata from Åsen, north east part of the Kristianstad Basin (southern Sweden) contain a most diverse vertebrate and invertebrate marine fossil assemblages. A diverse fossil fauna was collected from Campanian deposits from a ca. 4.15m thick section during June-August 2010-2012. READ MORE