The differences between temperate and tropical seasonality suggest that ecological models developed for temperate streams do not necessarily apply to tropical streams. While detritus is the base of the temperate zone stream food webs, we expected a seasonal alternation in the energy source in tropical streams (i.e., increase in the autochthonous energy source in the dry season, and an increase in the allochthonous energy source in the rainy season). We sought to evaluate the annual dynamics of the benthic macroinvertebrate functional feeding group (FFG) communities, the availability of their food resources, and the use of FFG ratios as surrogates for stream ecosystem traits in two first-order, tropical streams in Chiapas, Mexico. We found an increase in the biomass of herbivore-FFGs correlated to their autochthonous food resources in the dry season. The detritivore-FFGs biomass did not correlate to the abundance of the allochthonous food resources. Stream ecosystem traits were similar between seasons and were associated with a dominance of scrapers, shredders, and predators throughout the year. We concluded that the temperate classical ecological stream models that suggest allochthonous resources almost entirely support food webs do not directly extrapolate to tropical stream ecosystems. Instead, tropical stream food webs significantly rely on autochthonous food resources.

温带季节与热带季节之间的差异表明，针对温带河流开发的生态模型不一定适用于热带河流。虽然碎屑是温带河流食物网的基础，但我们预计热带河流中能源的季节性变化（即，干旱季节的自发能源增加，而雨季的异源能源则增加）季节）。我们力图评估底栖大型无脊椎动物功能性摄食组（FFG）社区的年度动态，其食物资源的可获得性以及使用FFG比率替代墨西哥恰帕斯州两个一级热带热带溪流的溪流生态系统特征的替代指标。 。我们发现在干燥季节，食草动物-FFGs的生物量增加与其自身的食物资源相关。有害的FFGs的生物量与异源食物资源的丰富度不相关。季节之间的溪流生态系统特征相似，并且与全年的刮板，切碎机和掠食者占主导地位有关。我们得出的结论是，温带古典生态流模型表明，异种资源几乎完全支持食物网，并不能直接推断到热带流生态系统。取而代之的是，热带溪流食物网极大地依赖于当地食物资源。季节之间的溪流生态系统特征相似，并且与全年的刮板，切碎机和掠食者占主导地位有关。我们得出的结论是，温带古典生态流模型表明，异种资源几乎完全支持食物网，并不能直接推断到热带流生态系统。取而代之的是，热带溪流食物网极大地依赖于当地食物资源。季节之间的溪流生态系统特征相似，并且与全年的刮板，切碎机和掠食者占主导地位有关。我们得出的结论是，温带古典生态流模型表明，异种资源几乎完全支持食物网，并不能直接推断到热带流生态系统。取而代之的是，热带溪流食物网极大地依赖于当地食物资源。