这项研究考察了南大洋捕食者的适应性,它依赖于南极磷虾(Euphausiasuperba),食物供应的潜在变化。从布兰斯菲尔德海峡(BS)的三个地区收集的多刺冰鱼Chaenodracowilsoni的肌肉脂肪酸(FA),在2016年2月至4月期间,南极半岛北部很好地代表了他们的摄食变异性。在具有Bellingshausen影响(TBW)控制的C.wilsoni的过渡区域水中,22:6n3(DHA)和20:5n3(EPA)的组成均高于具有WeddellSea影响(TWW)控制的鱼。这与TBW控制的浮游植物的光适应性和碳固存呈正相关。FAs16:1n7,16:0,DHA和EPA的结果表明在所有三个区域都存在鞭毛藻,这表明在夏末和初秋,有一个季节性的浮游植物演替,小浮游植物成为主导,在BS。此外,某些长链FAs的组成(>20,例如20:0、20:1、22:0和22:1n9)和∑18表明,基于鞭毛动物和co足类的食物链在TWW控制的C中更为明显。wilsoni,尤其是厄尔尼诺-南方涛动(ENSO)对TWW控制区猎物群落变化的影响。FA标记,如SFA/(PUFA+MUFA),∑15+∑17和ARA在TWW控制的C.wilsoni中更为明显,表明更强烈的食肉和底栖食物来源。在TBW-TWW汇合处,复杂的水文结构,包括大量中尺度涡流的存在,让丰富的营养和磷虾幼虫留在里面,为C.wilsoni提供丰富的食物来源.总的来说,这项研究的FA数据表明,C.wilsoni的饮食在不同的海洋环境中有所不同,帮助他们面对气候变化的生存能力。
This study examines the adaptability of a Southern Ocean predator, which is dependent on Antarctic krill (Euphausia superba), to potential changes in food availability. Muscle fatty acids (FAs) of the spiny icefish Chaenodraco wilsoni collected from three areas in the Bransfield Strait (BS), northern Antarctic Peninsula during February-April 2016 give a good representation of their feeding variability. The compositions of 22:6n3 (DHA) and 20:5n3 (EPA) were both higher in the Transitional Zonal Water with Bellingshausen influence (TBW)-controlled C. wilsoni than in the Transitional Zonal Water with Weddell Sea influence (TWW)-controlled fish. This was positively correlated with photoadaptation and carbon sequestration in TBW-controlled phytoplankton. Results for the FAs 16:1n7, 16:0, DHA and EPA indicate the presence of dinoflagellates in all three areas, suggesting that during late summer and early fall, there is a seasonal phytoplankton succession, where small phytoplankton become dominant, in the BS. In addition, the compositions of some long-chain FAs (>20, such as 20:0, 20:1, 22:0 and 22:1n9) and ∑18 indicated that the food chain based on flagellates and copepods was more apparent in TWW-controlled C. wilsoni, especially the effect of El Niño-Southern Oscillation (ENSO) on the variation of prey communities in TWW-controlled areas. FA markers such as SFA/(PUFA+MUFA), ∑15 + ∑17 and ARA were more pronounced in TWW-controlled C. wilsoni, indicating a more strongly carnivorous and benthic food source. In the TBW-TWW confluence, the complex hydrological structure, including the presence of a large number of mesoscale eddies, allows rich nutrients and krill larvae to remain in it, providing a rich food source for the C. wilsoni. Overall, the FA data of this study show that the diet of C. wilsoni varies in different marine environments, aiding their survivability at the face of climate change.