The invasive species Lantana camara is a common in India and this species is widespread in forests, where it is distributed along with native riparian species in streams. Decay rate and nutrient release of L. camara are necessary to understand the variability of aquatic communities and processes in impacted and non-impacted streams. Here, we examined native and invasive litter decomposition process and rate of sporulation by aquatic hyphomycetes on decomposition in a tropical stream. For this study, two native riparian (Syzygium alternifolium and Pongamia pinnata) and an invasive species (L. camara) were used at two different seasons. We found that litter decompositional rate differs with seasons, being higher in north-east monsoon. However, the invasive species decomposed faster than the native species. The species with lower sporulation rate, S. alternifolium, had higher sporulation rate. Our results demonstrated that abiotic process during litter decomposition in stream does not altered conversely biotic components of microbial consumers influence with the introduction of an invasive species.