Feeding habits of a pelagic amphipod,Themisto japonica
作者： H. Sugisaki , M. Terazaki , E. Wada , T. Nemoto
DOI: 10.1007/BF01319392
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摘要: Vertical distribution, chlorophylla (chla) and phaeopigment concentrations in the gut, natural nitrogen isotope ratio (δ 15N) were investigated for pelagic amphipodsThemisto japonica (Bovallius) collected from Sea of Japan July 1987. Differences diel vertical migration behavior clearly observed between small largeT. japonica. Many (<5 mm body length) amphipods appeared phytoplankton-rich shallow layers. Their gut pigment higher (mean 0.52 ± 0.15µg chla g−1 amphipod) than those large 0.33±0.14µg g−1); this implies that fed on a amount phytoplankton during early stage life. Theδ 15N values lower (5.7 to 6.3‰) (6.8 11.7‰), reflecting trophic level compared ones. similar herbivorous zooplankton. The amphipods' feeding thus changes carnivorous as they grow.
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