Fig 3 - uploaded by Shunsaku Miyachi
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(a) The histogram of δ 13 C for the Japanese anchovy in Sagami Bay and (b) in the offshore waters δ 15 N 値は-17.6±1.6‰(-18.9～-14.2‰)，11.3±2.8‰(8.9～ 17.8‰)とある。本研究の相模湾(n=84)では-17.4±1.5‰ (-20.2～-14.1‰)と 11.2±2.0‰ (8.3～18.5‰)でサンプル内 変動が大きいことは Tanaka et al.(2008)と一致した。 一方，外洋 3 海域(T09，T23，T29)の本種(n=15)の平 均 δ 13 C および δ 15 N 値(-19.8±0.4‰, 8.9±0.4‰)は Mitani et al. (2006)による(39°N，145°E；40°N，151°E)で捕獲 された本種の δ 13 C および δ 15 N 値(-18.9±0.5‰ ， 8.8±0.9‰)，さらに，Tanaka et al.(2008)による北日本 のはるか沖合の PO5(42°N，165°E)の値(-19.9±0.3‰， 8.7±0.34‰)に近い。本種の平均 δ 13 C および δ 15 N 値は外 洋域で低く，サンプル内変動が小さいことは Tanaka et al.(2008)，Mitani et al. (2006)に一致した。 France(1995)によると食物連鎖の起点(食源)の指標で ある δ 13 C 値は沿岸と沖合で異なる。したがって，δ 13 C は外洋個体群と相模湾群で有意差があるので，食物連鎖 の起点となる食源が異なると示唆された。 他方，δ 13 C-δ 15 N マップ(Fig.2)で明らかなように，外 洋個体群の δ 13 C・δ 15 N プロットは低く，相模湾個体群中 の低いプロットと重なる部分がある。相模湾個体群のプ
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The trophic level (TL) of the Japanese anchovy Engraulis japonicus was estimated using carbon / nitrogen stable isotope ratios (δ¹³C / δ¹⁵N). δ¹⁵N signature of the anchovy was high in Sagami Bay (inshore waters) and low in the offshore waters. Although the intra-sample variations of the δ¹⁵N and TL were small in offshore and large in inshore waters...
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