Comparison of aquatic insect assemblages between managed and unmanaged artificial lakes in Indonesia
Ummul Fadilah, Tri Atmowidi and Windra Priawandiputra
Aquatic insects are an example of organisms vulnerable to habitat alteration. Several artificial lakes were constructed with different maintenance pattern (managed and unmanaged) in Bekasi, which could impact development of aquatic insect community differently. Therefore, the present study examined the aquatic insect assemblages between managed and unmanaged artificial lakes in Indonesia from January to June 2016. Additionally, the influences of physico-chemical factors to the aquatic insect communities were assessed. The results showed that the abundance of insects were higher in managed (1059 individuals) than unmanaged lakes (426 individuals) (p<0.05, T-test). Significance of the difference of species composition between managed and unmanaged lakes was illustrated by the separated groups in nMDS graph (p<0.001, One-way ANOSIM). However, the same dominant species (Orthetrum testaceum) was found in both lakes. O. testaceum and Desmopachria latissima have strong correlation with all physico-chemical parameters. Different management of artificial lakes significantly changed the aquatic insect assemblages and unmanaged artificial lake decreased the abundance of aquatic insect.