摘要
This study measured stable carbon and nitro- gen isotope ratios in phytoplankton, zooplankton, five inver- tebrates species, eight fishes species and three seabirds spe- cies collected in Bohai Bay. δ 13C ranged from ?25.38‰ to ?11.08‰ showing a relative low enrichment in the food web from Bohai Bay. The mean δ 13C of mullet is higher than that of other organisms, and this might be due to that mullet is migration fish and feeds mainly on inshore sources. δ 15N ranged from 4.08‰ to 13.98‰, and showed a step-wise en- richment with trophic level of 3.8‰. The δ 15N enrichment factor was used to construct an isotopic food web model to establish trophic relationships within this marine food web. According to this model, exact trophic levels of all organisms were estimated as 1.46?2.10, 1.91?3.32, 2.55?4.23 and 2.98?4.28 for plankton, invertebrates, fishes, and seabirds.
This study measured stable carbon and nitrogen isotope ratios inphytoplankton, zooplanktan, five invertebrates species, eight fishes species and three seabirdsspecies collected in Bohai Bay. delta^(13)C ranged from -25.38 per thousand to -11.08 per thousand.showing a relative low enrichment in the food web from Bohai Bay. The mean delta^(13)C of mullet ishigher than that of other organisms, and this might be due to that mullet is migration fish andfeeds mainly on inshore sources. delta^(15)N ranged from 4.08per thousand to 13.98per thousand, andshowed a step-wise enrichment with trophic level of 3.8per thousand. The delta^(15)N enrichmentfactor was used to construct an isotopic food web model to establish trophic relationships withinthis marine food web. According to this model, exact trophic levels of all organisms were estimatedas 1.46=2.10, 1.91-3.32, 2.55-4.23 and 2.98-4.28 for plankton, invertebrates, fishes, and seabirds.
基金
This work was supported by the National Basic Research Program of China(Grant No.2003CB415004)
the National Natural Science Foundation of China(Grant No.40021101)
the Japanese Intermational Cooperation Agency.
关键词
渤海湾
营养网
营养水平
生态环境
food webs
trophic level
delta^(15)N
delta^(1513))C
Bohai Bay
