Stable Isotope Composition of Bryozoan Skeletons from Podbřežice (Middle Miocene, Central Paratethys, South Moravia, Czech Republic)

NEHYBA, Slavomír, Kamil ZAGORŠEK and Katarína HOLCOVÁ. Stable Isotope Composition of Bryozoan Skeletons from Podbřežice (Middle Miocene, Central Paratethys, South Moravia, Czech Republic) (Stable Isotope Composition of Bryozoan Skeletons from Podbřežice (Middle Miocene, Central Paratethys, South Moravia, Czech Republic).). In Bryozoan Studies 2007. Martinsville, Virginia, USA: Virginia Museum of Natural History, 2008, p. 163-173. ISBN 1-884549-30-6.

Basic information

• Original name: Stable Isotope Composition of Bryozoan Skeletons from Podbřežice (Middle Miocene, Central Paratethys, South Moravia, Czech Republic)
• Name in Czech: Složení stabilních izotopů v mechovkách lokality Podbřežice (střední miocén, centrální Paratethys, Jižní Morava, Česká republika).
• Authors: NEHYBA, Slavomír (203 Czech Republic, guarantor), Kamil ZAGORŠEK (203 Czech Republic) and Katarína HOLCOVÁ (203 Czech Republic).
• Edition: Martinsville, Virginia, USA, Bryozoan Studies 2007, p. 163-173, 11 pp. 2008.
• Publisher: Virginia Museum of Natural History

Other information

• Original language: English
• Type of outcome: Proceedings paper
• Field of Study: 10500 1.5. Earth and related environmental sciences
• Country of publisher: United States of America
• Confidentiality degree: is not subject to a state or trade secret
• RIV identification code: RIV/00216224:14310/08:00027543
• Organization unit: Faculty of Science
• ISBN: 1-884549-30-6
• Keywords in English: stable isotopes- Neogene- bryozoa
• Tags: stable isotopes- Neogene- bryozoa
• Tags: International impact, Reviewed

Abstract

The Middle Miocene exposure at Podbřežice (Czech Republic) was analyzed for C and O stable isotopes, including 21 whole rock samples, 98 samples of eight bryozoan species (3 Cyclostomatous and 5 Cheilostomatous) and 19 samples of foraminifer Amphistegina. Post-depositional processes (mainly recrystallization) changed the stable isotopic composition of the whole rock samples. The delta13C values of the bryozoans vary between 0 to 1.7. Two bryozoan groups can be distinguished based on different delta18O values: cyclostomatous bryozoans yield lower values than the cheilostomatous ones. The values shown by foraminiferal tests are closer to the cyclostomatous bryozoans. In contrast, the calculated paleotemperatures for cheilostomatous bryozoans correspond to published paleotemperature data from other taxa from the study area. We are unable to recognize whether the difference among the cheilostomatous and cyclostomatous genera is due to the skeletal ultrastructures, diagenesis, or vital effects. We suggest that the stable izotop from the cheilostomatous species Cellaria fistulosa, Myriapora truncata and Smittina cervicornis are more valuable but we have insufficient data to prove this.

Abstract (in Czech)

The Middle Miocene exposure at Podbřežice (Czech Republic) was analyzed for C and O stable isotopes, including 21 whole rock samples, 98 samples of eight bryozoan species (3 Cyclostomatous and 5 Cheilostomatous) and 19 samples of foraminifer Amphistegina. Post-depositional processes (mainly recrystallization) changed the stable isotopic composition of the whole rock samples. The delta13C values of the bryozoans vary between 0 to 1.7. Two bryozoan groups can be distinguished based on different delta18O values: cyclostomatous bryozoans yield lower values than the cheilostomatous ones. The values shown by foraminiferal tests are closer to the cyclostomatous bryozoans. In contrast, the calculated paleotemperatures for cheilostomatous bryozoans correspond to published paleotemperature data from other taxa from the study area. We are unable to recognize whether the difference among the cheilostomatous and cyclostomatous genera is due to the skeletal ultrastructures, diagenesis, or vital effects. We suggest that the stable izotop from the cheilostomatous species Cellaria fistulosa, Myriapora truncata and Smittina cervicornis are more valuable but we have insufficient data to prove this.

Links

• MSM0021622412, plan (intention): Name: Interakce mezi chemickými látkami, prostředím a biologickými systémy a jejich důsledky na globální, regionální a lokální úrovni (INCHEMBIOL) (Acronym: INCHEMBIOL)

Investor: Ministry of Education, Youth and Sports of the CR, Interactions among the chemicals, environment and biological systems and their consequences on the global, regional and local scales (INCHEMBIOL)