Upwelling-like bottom intrusion enhances the pelagic-benthic coupling by a fish predator in a coastal food web
Upwelling-like bottom intrusion enhances the pelagic-benthic coupling by a fish predator in a coastal food web
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类似上升流的底部入侵增强了沿海食物网中鱼类捕食者的中上层与底栖耦合
DOI：
10.1007/s10452-013-9466-8
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发表时间：
2014
期刊：
影响因子：
1.8
通讯作者：
N. Okuda & K. Omori
中科院分区：
文献类型：
--
作者：
Hamaoka;H.;A. Kaneda;N. Okuda & K. Omori
上升流区域是海洋中最具生产力的区域之一，在那里营养物质从深层沃茨输送到表层。虽然它是众所周知的，上升流影响渔业生产通过自下而上的营养级联，它仍然是未探索的时间变化，其强度如何改变整体营养能量流内的焦点食物网。在目前的研究中，我们表明，年际变化的上升流样的底部入侵的强度改变食物网的特性在沿海沃茨的宇和海的重点是对水平的δ 13 C和δ 15 N的底层鱼类捕食者，日本顶鱼。这种方法整合了关于捕食者与被捕食者相互作用的信息。在层化期之后的季节，当浮游生产力受到营养盐有效性的限制时，A。结果表明，在高入侵强度的年份，δ 13 C值低于低入侵强度的年份。造成这种同位素耗竭的一个可能原因是，海底入侵引起的营养供应增强了远洋生产力，从而促进了觅食的转变。japonicum由普通底栖猎物向δ 13 C较低的补充性中上层猎物转变。总之，增加强度的底部入侵的结果耦合两个主要的营养能流，浮游和底栖食物链，通过底栖捕食者的觅食转变。
Upwelling regions where nutrients are transported from deep to surface waters are among the most productive in the oceans. Although it is well known that the upwelling affects fishery production through bottom-up trophic cascading, it remains unexplored how temporal variation in its intensity alters overall trophic energy flows within a focal food web. In the present study, we demonstrate that inter-annual variation in the intensity of upwelling-like bottom intrusion alters food web properties in coastal waters of the Uwa Sea by focusing on the levels of δ13C and δ15N for a demersal fish predator,Acropoma japonicum. This approach integrates information on prey–predator interactions. In the season following a stratification period when pelagic productivity is limited by nutrient availability,A. japonicumshowed lower levels of δ13C in years with high bottom intrusion intensity than in those with low intensity. One possible cause for this isotopic depletion is that the bottom intrusion-induced nutrient supply enhances pelagic productivity and consequently facilitates a foraging shift byA. japonicumfrom ordinary benthic prey to supplementary pelagic prey with a lower δ13C. In conclusion, the increased intensity of bottom intrusion results in coupling of two major trophic energy flows, pelagic and benthic food chains, through the demersal predator’s foraging shift.