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Baetis digitatus (Scarce Iron Blue Mayfly)

 Baetis digitatus is a highly localised species with records from a small number of watercourses in Wales, southern England and a single watercourse in Scotland.  Nymphs of this species typically crawl amongst in-stream vegetation in riffle areas of rivers and streams or swim in short, darting bursts swims amongst the substrate.  They feed by scraping algae from submerged stones and other structures, or by gathering or collecting fine particulate organic detritus from the sediment.  Little is known about the lifecycle of this species however adults have been found between May and October.  Recent work has shown that there appears to be two distinct peaks in the flight period – one in the spring and another in the autumn.  This may suggest that there are two generations per year - a slow growing winter generation and a much faster summer generation.

 


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