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Details van artikel 37 van 62 gevonden artikelen
| Titel: |
Fossil evidence for chemoautotrophic bacterial symbiosis in the thyasirid bivalve thyasira michelottii from the middle Miocene (Badenium) of Austria |
| Auteur: |
Zuschin, Martin Mandic, Oleg Harzhauser, Mathias Pervesler, Peter |
| Verschenen in: |
Historical biology |
| Paginering: | Jaargang 15 (2001) nr. 3 pagina's 223-234 |
| Jaar: |
2001 |
| Inhoud: |
Many modern thyasirid bivalves are known to engage with chemoautotrophic bacteria in symbiosis, which can be inferred from the specialized feeding and digestive systems of these bivalves, as well as from stable carbon isotope ratios of their soft tissues. Fossil evidence for this life habit consists largely of facies criteria and bio-geochemical markers. Further evidence for chemosymbiosis is found in the characteristic burrow-systems of these bivalves, by which sulfide is obtained to sustain the symbiotic bacteria. These burrows were previously known only from observations made in aquaria. Such a burrow is described here for the first time in a fossil thyasirid bivalve. Thyasira michelottii (R. Hornes, 1875) burrowed in sandy sediment in an anterior-up position, approximately 5-10 cm below the surface, to which it was connected by an inhalant tube. It also produced a prominent posterio-ventral tunnel, extending up to 300 mm into the sediment. Like modern thyasirids, this animal lacked an exhalant tube. By comparison with the ecology of modern thyasirid bivalves, we suppose that oxygen was obtained by active ventilation through the inhalant tube and that the prominent posterio-ventral tunnel reflects search by the probing, vermiform foot for short-lived pockets of sulfidic material in an otherwise low-sulfide environment. The monospecific occurrence of Thyasira and the paleogeographic setting indicate dysaerobic, warm water conditions. A short distance to the coast and the occurrence of proximal tempestites suggest an inner shelf setting, prone to occasional disturbance by storms. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 37 van 62 gevonden artikelen
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