Abstract：
Global changes, through their impacts on ecosystem trophic structures, are behind regime shifts and cascading effects, and could result in the reorganization of whole ecosystems. The Celtic Sea is a temperate sea at risk of the above because of the interplay between climate change and fisheries. This sea has only displayed slight changes in species diversity between the late 20th century and the present day. However, this apparent stability in species diversity could be hiding structural transformations, including the rearrangement of trophic relationships. Historical stomach content database offers the opportunity to investigate changes in ecosystem trophic structure. Based on such database, this study explored shifts in the feeding habits of gadiform species in the Celtic Sea in the 1980s, 1990s, and 2010s. To this end, it examined dietary generalism and composition for four top predator fish species. During the target period, generalists maintained their diets, while specialists adopted more generalist diets. There were also decreases in frequencies of occurrence of certain fishes within the diets of gadiform species. These recent changes in trophic structure organization have likely been caused by the influence of global changes on both top-down and bottom-up processes that occurred in the Celtic Sea.
摘要：
全球变化,通过它们对生态系统营养结构的影响，是政权更迭和级联效应的背后，并可能导致整个生态系统的重组。由于气候变化和渔业之间的相互作用，凯尔特海是一个处于上述危险之中的温带海。从20世纪末到现在，这片海洋的物种多样性只发生了轻微的变化。然而,物种多样性的这种明显稳定性可能隐藏着结构转变，包括营养关系的重新安排。历史胃内容数据库提供了研究生态系统营养结构变化的机会。基于这样的数据库，这项研究探讨了1980年代凯尔特海gadiform物种的摄食习惯的变化，1990年代,2010s为此,它研究了四种顶级捕食者鱼类的饮食概括性和组成。在目标期间，通才维持他们的饮食，而专家们采用了更多的通才饮食。在gadiform物种的饮食中，某些鱼类的出现频率也有所下降。营养结构组织的这些最新变化可能是由于全球变化对凯尔特海自上而下和自下而上过程的影响所致。
