SOURCE: http://www.FORAMS2010.uni-bonn.de/sites/sessions/C4.php
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Session Session Title Convenor(s)
C4 Denitrification, bacterial symbionts, and biochemical challenges to survive under hypoxia in sulfidic environments.
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Summary

This session shall enhance the discussion on the survival of foraminifera in anoxic environments, started during Forams 2002. Since that time, studies on foraminifera from oxygen depleted micro-habitats revealed a number of astonishing adaptations to low oxidation potentials. Complete autogenous denitrification by foraminifera was recovered by laboratory studies and corroborated subsequently by field investigations. Chemotrophic endosymbionts were considered the guarantors of foraminiferal survival under highly reducing conditions. Sequestered chloroplasts were commonly observed in many species thriving in oxygen depleted environments; their potential oxydative phosphorylisation of free radicals was modeled to favor the redox demands of the foraminiferal host. In this session, we aim to present informations on foraminiferal strategies to thrive under low and lowest oxidation potentials. Any theoretical, modeling, quantitative or qualitative contribution will promote this developing theme. The spread may cover the state and expansion of marine oxygen minimum zones, bacterial commensalism/farming/symbiosis, species specific adaptations and metabolisms, extant and fossil assemblages recovered from dysoxic, sulphidic, and anoxic environments, down to their Precambrian evolution.
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