Assimilated carbon budget for the hyperiid amphipodThemisto japonica (bovallius) from the Japan sea as influenced by temperature |
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Authors: | Tsutomu Ikeda |
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Institution: | (1) Japan Sea National Fisheries Research Institute, 1 Suido-cho, 951 Niigata, Japan |
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Abstract: | Using a growth model based on moult number, the assimilated carbon budget was constructed forThemisto japonica growing from the specimens just released from the marsupium to mature adults at 1–15°C. As budget parameters, growth (G), metabolism (Me), moult (Mo), and reproduction (Re) were measured and assimilation (A) was estimated as the sum of these four parameters (A=G+Me +Mo +Re). The results of the lifetime budget indicated that among these parameters the greatest allocation ofA was toMe (70–83%). Lifetime expenditure of carbon forMe was the least at 7°C, andMe increased with either increase or decrease of the temperature from 7°C. A female grown to full adult size at 7°C invested
16.6 % forG, 70.2% forMe, 2.1% forMo, and 11.1% forRe of totalA. General features seen in the partition ofA toG, Me, Mo, andRe forT. japonica are similar to those of other planktonic crustaceans being reported. Considering the profound effect of temperature on the
assimilated carbon budget, practical problems in defining the representative habitat temperature for diel vertical migrators
likeT. japonica in the field are discussed. |
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