Our study describes the extraordinary capability of the endosymbiont-bearing bivalve Lucinoma aequizonata to tolerate environmental anoxia. The clam survives without oxygen for 262 days (50% mortality). The total quantity of glycogen in a specimen does not decrease significantly after long-term anoxia (10.5 mo). Common glycogen-derived anaerobic products (opines, lactate, succinate, acetate, and propionate) are only produced in minor quantities. This indicates either severe metabolic depression or the utilization of alternative energy sources. We have found indications that the endosymbiotic bacteria might function as an important carbon source for the bivalve. Transmission electron microscopy studies showed that the symbionts are largely degraded after L. aequizonata was incubated anoxically for 10.5 mo. Polyphosphates detected in symbiont granules by energy dispersive X-ray spectrometry (EDX) might represent an alternative energy source for the clam's metabolism under this stress situation.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 27 • No. 1