Change in metabolism and nitrogen isotopic composition of amino acids through egg production of the calanoid copepod Acartia steueri
Change in metabolism and nitrogen isotopic composition of amino acids through egg production of the calanoid copepod Acartia steueri
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桡足类 Acaria steueri 产卵过程中氨基酸代谢和氮同位素组成的变化
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Shuichi Yamamoto
中科院分区：
文献类型：
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作者：
Nobuyuki Nakatomi;Minamo Hirahara;N. Natori;T. Toda;Shuichi Yamamoto
生物体具有复杂的代谢网络，其通量可能对各种生理和环境条件敏感。作为这些因素之一，生殖（例如，产蛋）是创造新个体的一个常见和必不可少的过程。然而，很少有人知道的生物体的代谢通量的繁殖的影响。本研究通过人工培养的哲水蚤Acartiasteueri，测定了其雌、雄成虫和卵的氨基酸稳定氮同位素组成（δ 15 N），以探讨生殖对该种氨基酸代谢通量的影响。谷氨酸和苯丙氨酸的δ 15 N值和营养位估计值分别为：雄成虫6.3‰、−2.6‰和1.73，雌成虫7.0‰、−2.6‰和1.78，卵7.3‰、−2.3‰和1.82。这些结果表明，在所检查的样品中，氨基酸的同位素特征没有实质性变化，这意味着同化（即，吸收输入和生物质构造）和异化（即，氨基
Organisms have complex metabolic networks, and their fluxes could be sensitive depending on various physio logical and environmental conditions. As one of these factors, reproduction (e.g., egg production) is a common and essential process to create new individuals. However , little is known about the effect of reproduction in metabolic fluxes of organisms. In this study, we cultured the calanoid copepod Acartia steueri, and measured the stable nitrogen isotopic composition (δ 15 N) of amino acids in adult males and females and their eggs in order to demonstrate the effect of reproduction in amino acid metabolic fluxes of this species. The δ 15 N values of glutamic acid and phenylalanine and the estimated trophic position were 6.3‰, −2.6‰ and 1.73 for male adults; 7.0‰, −2.6‰ and 1.78 for female adults; and 7.3‰, −2.3‰ and 1.82 for eggs, respectively. These results demonstrate no substantial change in the isotopic signature of amino acids among the examined samples, implying that the balance in the amino acid metabolism between assimilation (i.e., absorbing input and biomass construction) and dissimilation (i.e., amino