Wichard Thomas, Poulet Serge A, Halsband-Lenk Claudia, Albaina Aitor, Harris Roger, Liu Dongyan, Pohnert Georg
Max Planck Institute for Chemical Ecology, Hans-Knoill-Str. 8, D-07745 Jena, Germany.
J Chem Ecol. 2005 Apr;31(4):949-58. doi: 10.1007/s10886-005-3615-z.
In recent years a negative influence of diatom-derived alpha,beta,gamma,delta-unsaturated aldehydes (PUA) on the reproductive success of copepods and invertebrates has been suggested. Since adverse chemical properties of diatoms would question the traditional view of the marine food web, this defense mechanism has been investigated in detail, but the PUA-release by test organisms has only been determined in a few cases. The observed effects were nevertheless frequently discussed from a general point of view often leading to contradictory conclusions. We have examined the PUA-production of 51 diatom species (71 isolates) in order to provide a basis for the interpretation of laboratory and field results on the influence of diatom food on the reproductive success of their consumers. PUA-production is species and strain dependent. Thirty-six percent of the investigated species (38% of the cultivated isolates) release alpha,beta,gamma,delta-unsaturated aldehydes upon cell disruption in concentrations from 0.01 to 9.8 fmol per cell. Thalassiosira rotula and Thalassiosira pacifica, major spring-bloom forming diatoms isolated from Roscoff (Bretagne, English Channel, France) and Puget Sound (Washington, USA) were among the PUA-producing strains.
近年来，有人提出硅藻衍生的α,β,γ,δ-不饱和醛（PUA）对桡足类动物和无脊椎动物的繁殖成功率有负面影响。由于硅藻的不良化学性质会对海洋食物网的传统观点提出质疑，因此对这种防御机制进行了详细研究，但仅在少数情况下确定了受试生物释放PUA的情况。然而，从总体角度对观察到的影响进行了频繁讨论，往往得出相互矛盾的结论。我们研究了51种硅藻（71个分离株）的PUA产量，以便为解释关于硅藻食物对其消费者繁殖成功率影响的实验室和野外结果提供依据。PUA产量因物种和菌株而异。36%的受试物种（38%的培养分离株）在细胞破裂时会释放α,β,γ,δ-不饱和醛，浓度为每细胞0.01至9.8飞摩尔。从罗斯科夫（法国布列塔尼，英吉利海峡）和普吉特海湾（美国华盛顿）分离出的主要形成春季水华的硅藻小环藻和太平洋海链藻属于产生PUA的菌株。
