Data for: Diet of large Catfishes from Madeira River

This dataset was used in Röpke et al. 2025 “Diet seasonality and resource partitioning by large catfishes in the Madeira River, Brazil. Published at Acta Amazonica to investigate two questions: (1) Do the diets of Brachyplatystoma species, as habitat specialists with large home ranges, exhibit seasonal variation?; and (2) How do habitat use and congeneric traits relate to the trophic segregation of large catfish species, enabling their co-occurrence in the Madeira River? The diet was described for eight species, of which diet seasonality was tested for four, while diet dissimilarity and overlap were estimated for seven regarding only the low-water season. The large pimelodids feed upon many fish families. Most Brachyplatystoma species did not exhibit seasonal shifts in prey consumption. Diet overlap was higher among congeneric and channel-restricted species, particularly Brachyplatystoma platynemum, B. rousseauxii, and B. vaillantii. Despite the diet overlap, some degree of trophic niche partitioning was observed, even among channel-restricted Brachyplatystoma species, mainly when comparing B. filamentosum to the other congeneric species.

本数据集用于Röpke等人2025年发表于《Acta Amazonica》的研究《巴西马代拉河大型鲶鱼的食性季节性与资源分隔（resource partitioning）》，旨在探究两个科学问题：（1）作为具有大范围活动区的生境特化种，短平口鲶属（Brachyplatystoma）物种的食性是否存在季节变化？（2）生境利用与同属物种的性状如何关联于大型鲶鱼物种的营养分隔（trophic segregation），从而使其能够在马代拉河中共存？本数据集对8个鲶鱼物种的食性进行了描述，其中4个物种的食性季节性得到了检验，另有7个物种仅针对枯水期的食性差异与食性重叠度进行了估算。油鲶科（Pimelodidae）大型物种以多个鱼类科的物种为食。大部分短平口鲶属物种的猎物摄入未表现出季节变化。同属且受河道生境限制的物种间食性重叠度更高，尤以短平口鲶属的Brachyplatystoma platynemum、B. rousseauxii及B. vaillantii为甚。尽管存在食性重叠，但即便在受河道生境限制的短平口鲶属物种中，仍观察到了一定程度的营养生态位分隔，尤其是在将Brachyplatystoma filamentosum与其他同属物种进行比较时。