Aquatic macroinvertebrates of Nee Soon 
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spring tear wawre yam u 
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Okm 0.2 km 0.4km 
Upper Pejrce Map data 2017 Google 
Ephemeroptera 
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Fig. 4. Distribution and abundance of order Ephemeroptera in the Nee Soon drainage. Solid 
circles indicate sites where representatives were collected and circle sizes are proportionate to 
abundance/numbers of individuals captured as reflected in the accompanying legend. 
Order Ephemeroptera 
Insects of the order Ephemeroptera are also known as the mayflies. The presence of 
this group of insects is generally an indication of good water quality (Blakely et al., 
2014), as they are sensitive to pollution. Mayflies spend most of their life in the larval 
stage. When they reach adulthood, they usually live for a very short period of time 
(Romoser & Stoffolano, 1994). There are 5 families from this order found in the Nee 
Soon drainage. Mayflies are distributed throughout the Nee Soon drainage in large 
numbers, but are most abundant in the northeast of the Nee Soon drainage. They were 
found in 38 out of 40 sites (not found at sites 11 and 28), with the most abundant site 
having around 80 or so individuals (Fig. 4). Common Ephemeroptera families included 
Baetidae and Caenidae, which were recorded at 34 and 29 sites across the Nee Soon 
