More mayflies

Pond olives from three or four sieve sweeps in the pond

Pond olives from three or four sieve sweeps in the pond

Back to the mayfly quiz. The tray above has about 600 animals (I confess to estimating rather than counting every one).

This was just from just 3 or 4 sweeps of my sieve so the pond must have thousands overall.

But although they’re common, these pond olives are far from ordinary animals:

Mayflies are often said to live for a day: but adult pond olives can live for up to 28 days (as well as the weeks or months the larvae spend under the water).

And unlike most mayflies pond olives don’t need lots of oxygen: they can survive up to 40 hrs in completely deoxygenated water, as long as its cold.

So this is one of the reasons they’re happy in ponds – where oxygen levels naturally go up and down, both over the day and over the year.

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2 Responses to “More mayflies”

  1. Ruth Says:

    I must win if there were no other entries?

    What is the prize? a free frog??

  2. Jeremy Biggs Says:

    Dear Ruth
    It’s cruel to give frogs as prizes!

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