CAJ | 학술논문

应用氮稳定同位素技术分析了2010年6月和8月辽东湾海域主要渔业生物的氮稳定同位素比值,研究了28种鱼类和26种无脊椎动物的营养位置.结果表明,辽东湾海域主要渔业生物的营养级处于2.98~4.84,集中在3.70~4.56;相比6月δ15N 值的分析结果,8月有50%的鱼类δ15N 值增加,孔鳐(Raja porosa)增幅最大,增加了1.06‰;9种鱼类δ15N值减少,鯒(Platycephalus indicus)减幅最大,减少了1.84‰,可见鱼类样品的δ15N值随季节的变化因种类而各异;8月有87.5%的无脊椎动物δ15N值减少,其中,减少幅度大于1‰的有6种,占37.5%,可见无脊椎动物的δ15N 值随季节的变化较明显.通过对不同采样点同种生物δ15N 值的比较发现,辽东湾近岸海域的10种无脊椎动物的δ15N值均高于远岸海域,差值范围为0.05‰~1.49‰,差异极显著(P<0.01),说明人类活动引起的陆源污水排放使近岸海洋生物的δ15N值升高.
응용담은정동위소기술분석료2010년6월화8월료동만해역주요어업생물적담은정동위소비치,연구료28충어류화26충무척추동물적영양위치.결과표명,료동만해역주요어업생물적영양급처우2.98~4.84,집중재3.70~4.56;상비6월δ15N 치적분석결과,8월유50%적어류δ15N 치증가,공요(Raja porosa)증폭최대,증가료1.06‰;9충어류δ15N치감소,통(Platycephalus indicus)감폭최대,감소료1.84‰,가견어류양품적δ15N치수계절적변화인충류이각이;8월유87.5%적무척추동물δ15N치감소,기중,감소폭도대우1‰적유6충,점37.5%,가견무척추동물적δ15N 치수계절적변화교명현.통과대불동채양점동충생물δ15N 치적비교발현,료동만근안해역적10충무척추동물적δ15N치균고우원안해역,차치범위위0.05‰~1.49‰,차이겁현저(P<0.01),설명인류활동인기적륙원오수배방사근안해양생물적δ15N치승고.
The stable nitrogen isotope ratio (δ15N) provides a powerful tool for estimating the trophic positions of consumers in food webs. We measuredδ15N in 28 fish species and 26 invertebrate species that were collected from Liaodong Bay in June and August, 2010. The trophic levels of these organisms ranged from 2.98 to 4.84, but were generally within the range of 3.70–4.56.δ15N values changed in a large proportion (50%) of fish between July and August, suggesting thatδ15N values vary among species and seasonally. The largest increase was in Raja porosa (1.06‰) and the biggest decrease was in Platycephalus indicus (1.84‰). Furthermore, δ15N values decreased in 87.5% of the invertebrates in August. The decrease in 6 invertebrate species was > 1‰ (37.5%), suggesting that invertebrates exhibit greater seasonal variation inδ15N than fish. We compared theδ15N values for 10 invertebrate species in the nearshore waters and offshore waters of Liaodong Bay to determine whether the inshore seawater environment and ecosystem is influenced by anthropogenic nitrogen inputs.