Scientists Recommend Cambodia to Improve Water Quality in Polluted Ponds

AKP Phnom Penh, May 06, 2020 —

The scientists who had studied about aquatic insects in some ponds in the Kingdom recommend the nation to put more efforts to improve water quality in some polluted ponds, according to a report published in Cambodian Journal of Natural History.

“We recommend that restoration efforts be undertaken to improve the water quality of the most polluted of our study ponds to enhance their aquatic life,” it underlined.

This recommendation had been raised following an investigation on aquatic insect life and its relationship to water quality in five ponds of the Royal University of Phnom Penh.

From this investigation, a total of 7,350 individuals of aquatic insects belonging to 23 families and six orders were collected and identified to family level. Hemiptera (mostly Micronectidae) were most abundant in our samples overall whereas Ephemeroptera and Lepidoptera were the least abundant.

Taxonomic richness, abundance and Shannon-Wiener’s diversity values differed significantly between our study ponds, said the report, adding that two ponds located in the southeast portion of the university were found to support the highest taxonomic richness and diversity, which was likely due to better water quality and greater aquatic vegetation. The least diverse study pond (P5) had rather polluted water and was dominated by members of the Micronectidae and Chironomidae which are more tolerant to pollution.

“Regression analysis showed that aquatic insect richness and abundance were positively associated with dissolved oxygen levels, but negatively associated with water turbidity,” it continued.

Aquatic insects (animals without an internal skeleton) are an ecological and polyphyletic group of arthropods which live or spend part of their life cycle in water. Some species are entirely aquatic whereas others are semi-aquatic, and they collectively comprise 12 orders and approximately 100,000 species in total. They play major roles as consumers, detritivores, predators and/or pollinators.

Royal University of Phnom Penh (Photo: IFT & RUPP)

By Khan Sophirom