Benthic macroinvertebrate communities

Ephemeropteran, dipteran, and trichopteran were found predominant orders comprising 11, 8 and 8 genera respectively. Heptagenids, baetids and leptophlebids; chironomids, ceratopagonids and tipulids and hydropsychids, psychomyids and polycentropodids were dominant sub-groups/families among ephemeropterans, dipterans and trichopterans respectively.

12p nguathienthan1 27-11-2019 14 1   Download

Carmago et al. (1992) found that the rivers nearer industrial discharge point have adverse impact to the environment as well as to macrobenthic communities. Toxic contaminants from surface runoff, sewage discharges and industrial discharge have caused negative impacts towards the freshwater macrobenthic communities. The presence of substance chemical such as ammonia, chlorine, cyanide, metals, PCBs, pesticides and phenols would caused a decline pattern on the number of species and changes in the species composition.

64p lulanphuong 28-03-2012 74 7   Download