142 
Ganl. Bull. Singapore 70 (Suppl. 1) 2018 
PC 3 
Fig. 12. Plot results of the ordinary linear square test on environmental variables PC3 to species 
diversity index (H’), with slope at 0.06, intercept 0.61. 
to the particular environmental variables that it requires either as an adult or larva. 
Localised movement behaviour may limit its dispersal capability. This remains a 
subject for future investigation. 
Prodasineura humeralis was not found in Murphy’s island wide odonate survey 
(Murphy, 1997). Murphy et al. (2008: 247), recognising it at the rank of subspecies, 
red-listed Prodasineura verticalis humeralis as Critically Endangered (CR) for 
Singapore. Tang et al. (2010: 92) stated that it was only first recorded in Singapore in 
October 2006, and classified the taxon as uncommon. Lolc (2008) suggested habitat 
fragmentation as a possible cause for its limited distribution. Ngiam & Cheong (2016: 
161) revised the conservation status of all odonate species found in Singapore and 
treated Prodasineura humeralis as being of least concern as it is currently a common and 
widespread species. Tang et al (2010: 92) described Prodasineura humeralis as being 
“associated with shaded forest streams with fast flowing water.” Observations from the 
present study show that the species is abundant in the outskirts and stream stretches 
