Depicting an energetic chain involved in physiological responses of blue mussel Mytilus edulis coping with BDE-47 exposure

Depiction on an energetic chain in terms of assimilation, allocation and consumption as well as the linkage between energetic alteration and physiological process was performed in blue mussel Mytilus edulis coping with tetrabromodiphenyl ether (BDE-47) based on a 21-day bioassay to shed light on the possible mechanism from energetic perspective. The filtration was hindered along with BDE-47 concentration increment and the influence of digestion was suggested according to the combination of the digestive enzymatic activities' alteration and digestive gland tissue impairment, both of which decided the energy availability reduction. Energy consumption indicated by the electron transport system activity was firstly inhibited while was greatly increased with BDE-47 increment, and the cellular energy allocation and adenylate pool were decreased simultaneously. An energetic chain was thus depicted: it tended to reduce energy absorption, elevate the energy consumption and decrease the energy metabolism with BDE-47 exposure, and M. edulis adopted the energetic strategy with variation regarding to the stressing level, suggesting as the preference switched from protein utilization to lipid utilization with the concentration increment. A consistence was observed in index of growth and survival with the change of energy allocation, inferring the energetic involvement in sustaining the viability of the mussel. (C) 2020 Elsevier Ltd. All rights reserved.

Automated summary

The study revealed the relationship between assimilation, allocation, and consumption of energy in blue mussel Mytilus edulis coping with tetrabromodiphenyl ether, and the impact of this energy alteration on physiological processes. Results showed that exposure to tetrabromodiphenyl ether reduced energy absorption, increased energy consumption, and affected energy allocation and metabolism. The mussel adopted different energy strategies in response to stress, with significant effects on growth and survival.