Long‐term changes in the abundance of fisheries resources from the Patos Lagoon estuary and adjacent coastal waters in southern Brazil have been observed. Despite this understanding, it is well known that the perception of pristine state of the environment is susceptible to inter‐generational changes, commonly known as shifting baseline syndrome (SBS). An useful approach in the reconstruction of pristine scenarios and in lack of data, as often occurs in small‐scale fisheries, is the local ecological knowledge (LEK). Temporal changes in the perception of 81 fishers with 1–63 years of fishing about the resources status were analysed. More experienced fishers reported larger catches, heavier individuals and perceived a greater number of species as "scarce" nowadays and "common" at the beginning of their careers proving the existence of a SBS among them. Over time, the number of fishing sites with very high catches decreased and fishing sites shifted from the lower towards the upper estuary. The perception of the fishers corroborated the real decreasing scenario in estuarine fisheries resources shared with industrial fishing in coastal waters. The results reinforce the utility of LEK for reconstruction of biological scenarios when no empirically obtained data are available.

中文翻译：

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基于当地生态知识的西南大西洋河口渔业资源长期变化

已经观察到巴西南部帕托斯泻湖河口和邻近沿海水域渔业资源丰度的长期变化。尽管有这种理解，但众所周知，对环境原始状态的感知容易受到代际变化的影响，通常称为基线漂移综合征 (SBS)。当地生态知识 (LEK) 是重建原始情景和缺乏数据的一种有用方法，这在小规模渔业中经常发生。分析了 81 名捕捞 1-63 年的渔民对资源状况的看法随时间的变化。更有经验的渔民报告了更大的捕获量、更重的个体，并认为现在更多的物种“稀缺”和“常见” 在他们职业生涯的初期证明了他们之间存在 SBS。随着时间的推移，捕捞量非常高的捕捞地点数量减少，捕捞地点从河口下游转移到河口上游。渔民的看法证实了与沿海水域工业捕捞共享的河口渔业资源实际减少的情况。当没有经验获得的数据可用时，结果加强了 LEK 在生物场景重建中的效用。