![]() ![]() Various studies have been shown that fish communities often consist of discrete and nonrandom species assemblages of which the community characteristics are to a large extent determined by a combination of due biotic and abiotic factors. Keywords: Fish communities Fish assemblage Biotic Abiotic Meta-community Climate change Exotic spices Finally, we saw that, fish community composition was negatively affected by human impact, Climate change, introduction of exotic spices and tourism or sports on streams. ![]() Most studies are based on field observations, and many suggest that niche segregation rather than competitive exclusion is the predominant outcome resulting from competitive interactions. Resource partitioning among fishes suggest that competition may play an important role in the local organization of communities. Predation is a major determinant of ecological patterns in fresh water fish communities. Streams are important habitats, providing shelter and feeding opportunities for a wide range of organisms like fish, insects, plants, mollusks, birds and mammals.įish community structure depends on biotic interactions and abiotic variables. ![]() Over large geographical and habitat scales, environmental filtering and anthropogenic effects are generally the most important determinants of assemblage variability. Most fish in small, stable streams are most probably habitat specialists that have evolved various morphological and behavioral adaptations to exploit specific habitat types. In a meta-community framework, local fish communities may be structured by both spatial and environmental factors. Stream fish communities are all structured none randomly in space. Fish communities often consist of discrete and nonrandom species assemblages. The objective of this review was to provide an overview of the major biotic and abiotic factors that determine the composition of stream fish communities.
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