Psalidodon paranae is an endemic small Characidae from the Upper Paraná River ecoregion (Neotropical region, Brazil), where many watercourses are affected by anthropic activities. The Verde River (VR) was chosen as a model to study the feeding trends of P. paranae. Based on empirical observations, hypotheses were set concerning its occurrence, the environmental representativeness of its diet and the multifactors modulating ontogenetic, spatial, and temporal diet variations. To evaluate these hypotheses for the first time, an integrative approach was applied (modelling and multivariate techniques). Standardized samplings were performed monthly during one year at four sites. Influence of environmental variables on fish distribution was evaluated by means a general linear model. Stomach content analysis of P. paranae allowed the calculation of gravimetric frequency of consumed food categories. Ontogenetic, spatial, and temporal differences on diet were evaluated by means a permutational multivariate analysis of variance, and the influence of environmental variables on them with a canonical correspondence analysis. From the total of 301 specimens caught (4.6–13.4 cm total length range), 216 individuals of P. paranae presented stomach with contents. The species consumed 32 different food categories in VR, highlighting aquatic and terrestrial angiosperms, and beetles. The methods applied identified significative spatial and temporal differences in P. paranae diet as result of multifactors (palaeogeomorphology, abiotic, biotic, and anthropic) operating in the VR. Heterogeneity and complexity of VR and P. paranae occurrence and feeding trends evidenced that the opportunistic and generalist behavior lead to intrinsic patterns of each fish population at each watercourse.

Psalidodon paranae是来自上巴拉那河生态区（巴西新热带地区）的地方性小型Characidae，那里的许多水道都受到人类活动的影响。选择Verde河（VR）作为模型来研究对虾假单胞菌的摄食趋势。基于经验观察，就其发生，饮食的环境代表性以及调节个体发育，空间和时间饮食变化的多因素设定了假设。为了首次评估这些假设，应用了一种综合方法（建模和多元技术）。一年中每月在四个站点进行标准化采样。通过一般线性模型评估环境变量对鱼类分布的影响。副肺假单胞菌的胃液含量分析允许计算食用食品类别的重量频率。饮食的个体遗传，空间和时间差异通过方差的排列多元分析进行评估，并通过规范对应分析对环境变量的影响进行评估。在总共捕获的301个标本中（总长度范围为4.6-13.4 cm），有216名副食假单胞菌出现了胃中的内容物。该物种在VR中消费了32种不同的食物类别，突出了水生和陆生被子植物以及甲虫。所应用的方法已确定，由于虚拟现实中多种因素（古地貌，非生物，生物和人类）的作用，副食假单胞菌饮食具有明显的时空差异。VR和副对虾的发生和喂食趋势的异质性和复杂性证明，机会主义和通才行为导致每个水道中每个鱼类种群的固有模式。