摘要
稳定同位素分析技术已成为生态学中营养来源研究的重要手段,但前提需获得动物对不同饵料中稳定同位素的富集效应数据。该实验以从红树林和邻近滩涂收集的犬牙珠鰕虎鱼(Acentrogobius caninus)、李氏■(Callionymus richardsoni)、须赤虾(Metapenaeopsis barbata)、杂色蛤(Ruditapes philippinarum)、多齿围沙蚕(Perinereis nuntia),以及养殖的双齿围沙蚕(P.aibuhitensis)为饵料,投喂拟穴青蟹(Scylla paramamosain)幼蟹66 d。结果显示,杂色蛤、双齿围沙蚕和须赤虾对青蟹的养殖效果较好。不同饵料的氮稳定同位素(δ^(15)N)和碳稳定同位素(δ^(13)C)含量均显著高于初始青蟹,青蟹摄食不同饵料后体内δ^(15)N和δ^(13)C含量显著提高,判别值Δ^(13)C分别为0.7、−0.19、0.22、2.58、−0.12、2.75,Δ^(15)N介于−2.98~0.21,大多数与普遍采用的作为判断直接捕食者与食物的差值标准判别值Δ^(13)C(0‰~1‰)和Δ^(15)N(3‰~4‰)有一定差距,这种差别可能是因为滩涂生物与其他生物对同位素的富集效应差别较大,也可能由于实验后期水温较低,青蟹生长慢、体质量增长率低,使体内碳(C)和氮(N)未能充分更新引起。
Stable isotope analysis technology has become an important means in the study of nutrition sources in ecology,but the premise is to obtain the data of stable isotope enrichment effect of animals in different diets.In this experiment,Acentrogobius caninus,Callionymus richardsoni,Metapenaeopsis barbata,Ruditapes philippinarum,Perinereis nuntia and cultured P.aibuhitensis were collected from mangroves and adjacent beaches and used as baits to feed Scylla paramamosain for 66 d.The results indicate that R.philippinarum,P.aibuhitensis and M.barbata had better culture effects on S.paramamosain.The stable isotope abundances ofδ^(13)C andδ^(15)N in the six natural diets were obviously higher than that in initial crabs.Compared with the initial crabs,the contents of stable isotopeδ^(13)C andδ^(15)N of final crabs increased significantly.The enrichment effects of the^(13)C(Δ^(13)C)were 0.7,−0.19,0.22,2.58,−0.12 and 2.75 for the six diets,respectively,while theΔ^(15)N varied from−2.98 to 0.21.Most of these values were inconsistent with the judgment baselines(discrimination)of direct predator and prey,which were 0‰−1‰forΔ^(13)C and 3‰−4‰forΔ^(15)N,re-spectively.This may be due to the huge difference of stable isotope enrichment between beach dwelling organisms and land organ-isms.It is also possible that low water temperature,slow growth and low weight gain rate of S.paramamosain at later stage of the ex-periment lead to insufficient renewal of carbon and nitrogen in the body.
作者
黄国强
曹素会
刘旭佳
彭银辉
刘永宏
黄亮华
钟声平
HUANG Guoqiang;CAO Suhui;LIU Xujia;PENG Yinhui;LIU Yonghong;HUANG Lianghua;ZHONG Shengping(Institute of Marine Drug,Guangxi University of Chinese Medicine,Nanning 530200,China;Guangxi Academy of Sciences/Guangxi Key Laboratory of Marine Environmental Science/Guangxi Beibu Gulf Marine Research Center,Nanning 530007,China;Ocean College,Beibu Gulf University/Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation,Qinzhou 535011,China)
出处
《南方水产科学》
CAS
CSCD
北大核心
2021年第3期19-26,共8页
South China Fisheries Science
基金
广西自然科学基金项目(2017GXNSFAA198022)
广西重点研发计划项目(桂科AB16380105)
广西中医药大学博士启动经费课题(2018BS034)
广西中医药大学2018年海洋药物研究院团队科研启动经费项目(2018ZD005)
广西八桂学者专项经费(05019055)。
关键词
拟穴青蟹
稳定同位素
富集效应
饵料
Scylla paramamosain
Stable isotope
Enrichment effects
Diets
