The flood pulse is the main driving force for communities' structure and functioning in river-floodplain systems. High synchrony exists between the hydrological cycle and reproductive cycle events for several fish species. However, species with different reproductive strategies can respond in different ways to the flood regime. Thus, this study intends to evaluate the relationship between the recruitment of different reproductive guilds of freshwater fish and flood attributes (flood duration, maximum annual water level, and delay of flood) from a time series of 20 years in the Upper Paraná River floodplain, Brazil. The abundance of four guilds was evaluated: (i) long-distance migratory with external fertilization and without parental care (LMEF); (ii) non-migratory or short-distance migratory with external fertilization and without parental care (NEFW); (iii) non-migratory or short-distance migratory with external fertilization and parental care (NEFP); and (iv) non-migratory or short-distance migratory with internal fertilization and without parental care (NIF). Multiple regression analyses were applied between flood attributes and abundance of young-of-the-year or juveniles for each reproductive guild. This study observed a consistent pattern of long-lasting flooding positively influencing the recruitment of all reproductive guilds, while water level intensity and the time of the onset of flooding also influenced some non-migratory strategies. We can conclude that the conservation of fish populations and the maintenance of ecosystem functions and services associated with them need to be considered in the operating protocols of upstream hydroelectric plants, since they are dependent on the flooding controlled by them.

中文翻译：

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淡水鱼类补充与不同繁殖策略和洪水属性的关系：巴拉那河上游泛滥平原的长期观点

洪水脉冲是河流泛滥平原系统中社区结构和功能的主要驱动力。几种鱼类的水文循环和繁殖循环事件之间存在高度同步。然而，具有不同繁殖策略的物种可以以不同的方式对洪水状况做出反应。因此，本研究旨在评估上游巴拉那河泛滥平原 20 年时间序列中淡水鱼不同繁殖群的招募与洪水属性（洪水持续时间、年最高水位和洪水延迟）之间的关系，巴西。评估了四个公会的丰度：(i) 外部受精和无父母照顾的长距离迁徙 (LMEF)；(ii) 外部受精且没有父母照顾的非迁徙或短距离迁徙（NEFW）；(iii) 有体外受精和父母照顾（NEFP）的非迁徙或短距离迁徙；(iv) 内部受精且无父母照料 (NIF) 的非迁徙或短距离迁徙。多元回归分析应用于洪水属性和每个繁殖行会的幼鱼或幼鱼的丰度。这项研究观察到长期洪水的一致模式对所有繁殖行会的招募产生积极影响，而水位强度和洪水发生的时间也影响了一些非迁移策略。