• ABOUT
  • BIRDING 2018
  • Birding 2019
  • BLOG POSTS
  • Butterflies 2018
  • Resources

earthstar

~ a celebration of nature

earthstar

Tag Archives: green islands

316/366 Green islands

11 Wednesday Nov 2020

Posted by sconzani in autumn, insects, trees

≈ 3 Comments

Tags

beech, gall causing midge, galls on Beech, green islands, green islands on Beech leaves, Hartigiola annulipes, leaf mines, leaf mines on Beech, Stigmella tityrella

It’s late autumn, nearly winter, and, as you would expect, the leaves on this Beech tree have all now changed from vivid summer green to autumn brown … or have they? If you look more closely at this image, you’ll notice that some of the leaves have what entomologists, moth-ers and others in the know call ‘green islands’.

201111 green islands on beech

Butterfly Conservation’s Associate Director of Recording and Monitoring Richard Fox explained the reason for this most succinctly in a recent post on Twitter: ‘Thanks to Wolbachia bacteria in its body, the caterpillar uses cytokinin to maintain a green island of plant tissue in which it can feed in autumn.’

201111 green island stigmella tityrella (2)
201111 green island stigmella tityrella (1)

Fox was referring to leaf-mining moth caterpillars, like the Stigmella tityrella moth larvae that produced the mines in the leaves shown above, but other insects also manipulate the physiology of leaves so they can continue feeding. Another example from the same Beech tree can be seen below – here the larvae of the gall-inducing midge Hartigiola annulipes have also caused green islands to form in the leaves.

201111 Hartigiola annulipes green islands (1)

If you want to read more on the science behind this process, I found a paper entitled ‘Plant green-island phenotype induced by leaf-miners is mediated by bacterial symbionts‘, on the Royal Society website.

Like this:

Like Loading...

About me

sconzani

sconzani

I'm a writer and photographer; researcher and blogger; birder and nature lover; countryside rambler and city strider; volunteer and biodiversity recorder.

View Full Profile →

Follow earthstar on WordPress.com

Enter your email address to follow this blog and receive notifications of new posts by email.

Recent blog posts

  • The chocolate butterfly July 5, 2022
  • Leafmines: Liriomyza eupatorii July 4, 2022
  • Oxeyes and friends July 3, 2022
  • Picture-winged flies on Burdock July 2, 2022
  • A darling darter July 1, 2022

From the archives

Follow me on Twitter

My Tweets

COPYRIGHT

Unless otherwise acknowledged, the text and photographs on this blog are my own and are subject to international copyright. Nothing may be downloaded or copied without my permission.

Click on the category

'Dedicated Naturalist' Project 365DaysWildin2019 amphibian animals autumn birds coastal fauna flowers fungi geology insects ladybird leaves lichen mammal molluscs nature nature photography parks plants reptiles seaside seasons spiders spring trees walks weather wildflowers winter

Fellow Earth Stars!

Blog at WordPress.com.

  • Follow Following
    • earthstar
    • Join 567 other followers
    • Already have a WordPress.com account? Log in now.
    • earthstar
    • Customize
    • Follow Following
    • Sign up
    • Log in
    • Report this content
    • View site in Reader
    • Manage subscriptions
    • Collapse this bar
 

Loading Comments...
 

You must be logged in to post a comment.

    %d bloggers like this: