Strategies of anaerobiosis in New Zealand infaunal bivalves: Adaptations to environmental and functional hypoxia
作者:
JasonL. Carroll,
RufusM. G. Wells,
期刊:
New Zealand Journal of Marine and Freshwater Research
(Taylor Available online 1995)
卷期:
Volume 29,
issue 2
页码: 137-146
ISSN:0028-8330
年代: 1995
DOI:10.1080/00288330.1995.9516649
出版商: Taylor & Francis Group
关键词: bivalves;anaerobiosis;pyruvate reductase;buffering capacity;energy charge;lactate;octopine
数据来源: Taylor
摘要:
Under hypoxic environmental conditions, slowly burrowing bivalves such as the pipi (Paphies australis) and cockle (Austrovenus stutchburyi) support anaerobic energy production through the pyruvate reductase enzymes strombine dehydro‐genase and alanopine dehydrogenase. Rapidly digging surf clams such as the tuatua (P. sub‐triangulatum) and trough shell (Mactra discors) do not fare as well at low oxygen levels, but perform better under the functional anaerobiosis generated by burrowing, and energy production is supported by octopine dehydrogenase. Muscle buffering capacity is higher in rapidly burrowing species and is correlated with total pyruvate reductase activity. Anaerobic pathways inP. subtriangulatumled to both D‐lactate and octopine accumulation during environmental hypoxia, but only octopine accumulated during burrowing. Bivalves adapted to environmental hypoxia maintained high adenylate energy charge (AEC) under anaerobiosis, indicating a close matching of ATP production to consumption. AEC fell inP. subtriangulatumduring environmental hypoxia. The significance of these findings is discussed within an ecological context, and in relation to the storage of live clams for the seafood industry.
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