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Suyan Xue, Yuze Mao, Jiaqi Li, Jianguang Fang, Fazhen Zhao. Effects of rising temperature on growth and energy budget of juvenile Eogammarus possjeticus (Amphipoda: Anisogammaridae)[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-021-1863-6
Citation: Suyan Xue, Yuze Mao, Jiaqi Li, Jianguang Fang, Fazhen Zhao. Effects of rising temperature on growth and energy budget of juvenile Eogammarus possjeticus (Amphipoda: Anisogammaridae)[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-021-1863-6

Effects of rising temperature on growth and energy budget of juvenile Eogammarus possjeticus (Amphipoda: Anisogammaridae)

doi: 10.1007/s13131-021-1863-6
Funds:  The Youth Talent Support Program of the Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology (Qingdao) under Contract No. LMEESYTSP-2018-04-02; the Creative Team Project of the Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology (Qingdao) under Contract No. LMEES-CTSP-2018-4; the Central Public-interest Scientific Institution Basal Research Fund, CAFS under Contract No. 2020TD50.
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  • Corresponding author: E-mail: maoyz@ysfri.ac.cn
  • Received Date: 2020-06-30
  • Accepted Date: 2021-03-29
  • Available Online: 2021-06-29
  • Growth and energy budget of marine amphipod juvenile Eogammarus possjeticus at different temperatures (20°C, 24°C, 26°C, 28°C, 30°C, 32°C and 34°C) were investigated in this study. The results showed that the cumulative mortality rate increased significantly with rising temperature (p<0.01), and exceeded 50% after 24 h when temperature was above 30°C. With the temperature increasing from 20°C to 26°C, the ingestion rate and absorption rate increased, but decreased significantly above 28°C (p<0.01), indicating a decline in feeding ability at high temperatures. The specific growth rate increased with rising temperature, but decreased significantly (p<0.01) after reaching the maximum value at 24°C. Similarly, the oxygen consumption and ammonia emission rates also showed a trend of first increase and then decrease. However, the O:N ratio decreased first and then increased with rising temperature, indicating that the energy demand of E. possjeticus juvenile transferred from metabolism of carbohydrate and lipid to protein. In the energy distribution of amphipods, the proportion of each energy is different. With rising temperature, the ratio of the energy deposited for growth accounted for ingested gross energy showing a trend of decrease, while the energy lost to respiration, ammonia excretion, and feces accounted for ingested gross energy being showed a trend of increase. It seemed that rising temperature increased the metabolism and energy consumption of the amphipods and, meanwhile, decreased the energy used for growth, which may be an important reason for the slow growth and small body size of the amphipods during the summer high-temperature period.
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