Logo der Universität Wien

From November 1998 to December 2001, I was research assistant at my department, working within our first turtle project
"Feeding Patterns in Turtles: Evolution under the Pressure of Morphological and Physical Constraints?!"

In November 2007, we started our second turtle project
"Functional ontogeny and plasticity of turtle feeding: Do the young ones as the adult ones do?"

Within these projects, SEM was used to show the surface topography of tongue and esophagus in the studied species adapted to water in a different extent. At higher magnification, surface structures of single cells were studied in order to investigate if differences between the species can be found.
LM and TEM of lingual and esophagial epithelium after standard fixation methods allowed the description of different cell types wi thin the single cell layers. The usage of modified staining methods enhanced the visualization of connective tissue fibres, structures of the basement membrane and intermediate filaments, or gave enhanced membrane contrast as well as selective staining of structures containing carbohydrates.
The usage of µCT of lingual epithelium resin-embedded for TEM and of SEM-preparated specimen will allow to reconstruct tissue blocks.

Right now, I am still working on lingual eithelia of turtles finishing the project's work, as well as examining new species ...

 

Grants

FWF-Project P20094-BIO (11/2007 – 07/2011, Main PI: J. Weisgram)
"Functional ontogeny and plasticity of turtle feeding: Do the young ones as the adult ones do?"
project design und co-PI: C. Beisser, P. Lemell

FWF-Projekt P12991-BIO (06/1998 – 12/2001, PI: J. Weisgram)
"Feeding Patterns in Turtles: Evolution under the Pressure of Morphological and Physical Constraints?!"
project design: C. Beisser, P. Lemell, R. Wochesländer

Hochschuljubiläumsstiftung der Stadt Wien (1997, PI: J. Weisgram)
"Histologische und ultrastrukturelle Untersuchungen am Zungenepithel der Schildkröten"
project design: C. Beisser

 

Publications

* Theses

Beisser CJ, Gemel R, Weisgram J. in prep. The histology and ultrastructure of the dorsal lingual epithelium in two Cuora species.

Heiss E, Natchev N, Schwaha T, Salaberger D, Lemell P, Beisser CJ, Weisgram J. 2011. Oropharyngeal morphology in the basal tortoise Manouria emys emys with comments on form and function of the testudinid tongue. Journal of Morphology 272: 1217-1229 [cover image]

Natchev N, Lemell P, Heiss E, Beisser CJ, Weisgram J. 2010. Aquatic feeding in a terrestrial turtle: a functional-morphological study of the feeding apparatus in the Indochinese box turtle Cuora galbinifrons (Chelonia, Geoemydidae). Zoomorphology 129: 111-119

Heiss E, Natchev N, Beisser CJ, Lemell P, Weisgram J. 2010. The fish in the turtle: On the functionality of the oropharynx in the common musk turtle Sternotherus odoratus (Chelonia, Kinosternidae) concerning feeding and underwater respiration. The Anatomical Record 293: 1416-1424

Lemell P, Beisser CJ, Gumpenberger M, Snelderwaard P, Gemel R, Weisgram J. 2010. The feeding apparatus of Chelus fimbriatus (Pleurodira; Chelidae) - adaptation perfected? Amphibia-Reptilia 31: 97-107

Wagner FH, Beisser CJ. 2005. Does carbon enrichment affect hyporheic invertebrates in a gravel stream? Hydrobiologia 544: 189-200

Beisser CJ, Lemell P, Weisgram J. 2004: The dorsal lingual epithelium of Rhinoclemmys pulcherrima incisia (Chelonia, Cryptodira). The Anatomical Record Part A 277A: 227-235

Nussbaumer AD, Bright M, Baranyi C, Beisser CJ, Ott JA. 2004. Attachment mechanism in a highly specific association between ectosymbiotic bacteria and marine nematodes. Aquatic Microbial Ecology 34: 239–246

* Beisser CJ. 2001. The dorsal tongue morphology and the dorsal lingual epithelium of turtles under the light of morphological and physical constraints. Ph.D. Thesis, University of Vienna.

Beisser CJ, Lemell P, Weisgram J. 2001. Light and electron microscopy of the dorsal lingual epithelium of Pelusios castaneus (Pleurodira, Chelidae) with special respect to its feeding mechanics. Tissue & Cell 33: 63-71

Lemell P, Beisser CJ, Weisgram J. 2000. Morphology and function of the feeding apparatus of Pelusios castaneus (Chelonia; Pleurodira). Journal of Morphology 244: 127-135

Beisser CJ, Weisgram J, Hilgers H, Splechtna† H. 1998. Fine structure of the dorsal lingual epithelium of Trachemys scripta elegans (Chelonia: Emydidae). The Anatomical Record 250: 127-135

* Beisser CJ. 1996. Electron Microscopical Investigations of the dorsal lingual epithelium of two turtle species - a comparison. Diploma Thesis, University of Vienna.

Beisser CJ, Weisgram J, Splechtna H. 1995. The dorsal lingual epithelium of Platemys pallidipectoris (Pleurodira, Chelidae). Journal of Morphology 226: 267-276

 

Published Abstracts

Nussbaumer AD, Bright M, Beisser CJ, Ott JA. 2001. Partner recognition and maintenace in a highly specific association between ectosymbiotic bacteria and marine nematodes. In: Abstract Book of the Eleventh International Meiofauna Conference (ELIMCO). Boston University University, Boston, Massacusetts, p 46

Nussbaumer AD, Bright M, Beisser CJ, Ott JA. 2000. Biochemical characterisation of the recognition/maintenance mechanism between thiotrophic ectosymbionts and Stilbonematinae. In: H. Chr. Weber, S. Imhof and D. Zeuske. Programs, Abstracts and Papers of the Third International Congress on Symbiosis. Philipps University of Marburg, Germany, p 159

Beisser CJ, Weisgram J. 2001. Dorsal tongue morphology and lingual glands in chelonians. Journal of Morphology 248: 205

Weisgram J, Beisser CJ, Lemell P, Wochesländer R. 2001. Aquatic versus terrestrial - which is the primitive turtle feeding mode? Journal of Morphology 248: 299

Lemell P, Beisser CJ, Weisgram J. 1997. Feeding patterns of Pelusios castaneus (Chelonia: Pleurodira) with comments on the morphology of its tongue. Journal of Morphology 232: 285

Beisser CJ, Lemell P, Weisgram J. 1997. Morphology of the tongue surface of Pelusios castaneus (Chelonia: Pleurodira) with comments on its function. Journal of Morphology 232: 233

Beisser CJ. 1994. The dorsal lingual epithelium in two chelonian suborders - a comparison. Journal of Morphology 220: 324

 

Congresses and Meetings

Natchev N, Heiss E, Lemell P, Beisser CJ, Weisgram J. 2010. Ecomorphology and  function of the feeding apparatus in geoemydids and tortoises (Testudines, Cryptodira). 9. International Congress of Vertebrate Morphology. Punta del Este, Uruguay.

Weisgram J, Beisser CJ, Lemell P, Wochesländer R. 2002. Different food ingestion modes in turtles - a comparison. Congress "Shaping Up, the Evolution of Animal Form". Leiden, Netherlands.

Beisser CJ , Weisgram J. 2001. Dorsal tongue morphology and lingual glands in chelonians. 6. International Congress of Vertebrate Morphology. Jena, Germany.

Weisgram J, Beisser CJ, Lemell P, Wochesländer R. 2001. Aquatic versus terrestrial - which is the primitive turtle feeding mode? 6. International Congress of Vertebrate Morphology. Jena, Germany. 

Nussbaumer AD, Bright M, Beisser CJ, Ott JA. 2001. Partner recognition and maintenace in a highly specific association between ectosymbiotic bacteria and marine nematodes. 11. International Meiofauna Conference (ELIMCO). Boston, Massacusetts, USA.

Nussbaumer AD, Bright M, Beisser CJ, Ott JA. 2000. Biochemical characterisation of the recognition/maintenance mechanism between thiotrophic ectosymbionts and Stilbonematinae. 3. International Congress on Symbiosis. Marburg, Germany.

Lemell P, Beisser CJ, Weisgram J. 1997. Feeding patterns of Pelusios castaneus (Chelonia, Pleurodira) with comments on the morphology of its tongue. 5. International Congress of Vertebrate Morphology. Bristol, England. 

Beisser CJ, Lemell P, Weisgram J. 1997. Morphology of the tongue surface of Pelusios castaneus (Chelonia, Pleurodira) with comments on its function. 5. International Congress of Vertebrate Morphology. Bristol, England. 

Beisser CJ. 1994. The dorsal lingual epithelium in two chelonian suborders - a comparison. 4. International Congress of Vertebrate Morphology. Chicago, USA.

 

National & international cooperations

Richard Gemel
Museum of Natural History, Vienna, Austrian Herpetological Society (ÖGH)

Ass.-Prof. Dr.med.vet. Michaela Gumpenberger
University of Veterinary Medicine, Vienna, Clinic of Radiology

Prof. Dr. V. Bels
Museum National d'Histoire Naturelle, Paris, France

Ultrastructural Research Group
Institution of Cell Imaging and Ultrastructure Research, University of Vienna


University of Vienna | Universitätsring 1 | 1010 Vienna | T +43-1-4277-0