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    Vindication!

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    chris c
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    Vindication!

    Post by chris c on Tue Jul 11 2017, 23:13

    Long ago I read a paper on the migratory habits of Sedge Warblers.

    They cross the Sahara to overwinter in Africa every Autumn. To fuel the flight they double their bodyweight, which they achieve by switching to high carb insects - plum reed aphids - which are basically little protein bags full of sugar from the plant sap. Then they burn the fat on the migratory flight.

    I predicted at the time that they would switch on insulin resistance to convert the sugar and store it as fat, then switch it off again to access it. Likely the same for other birds who put on fat for the winter by eating berries.

    Thanks to Tim Noakes

    https://www.researchgate.net/publication/223683158_The_body_mass_cycle_of_the_migratory_garden_warbler_Sylvia_borin_is_associated_with_changes_of_basal_plasma_metabolite_levels

    well Garden Warblers are similar but perhaps less extreme.

    This is from nearly twenty years ago.
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    Jan1
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    Re: Vindication!

    Post by Jan1 on Thu Jul 13 2017, 17:35

    Thanks Chris,
    Nature can be wonderful ...
    So too is the internet, for finding out more about birds!



    More about garden warblers:

    Overview
    Latin name
    Sylvia borin

    Family
    Warblers and allies (Sylviidae)

    Where to see them
    Deciduous and mixed woodland and woodland edges, with glades, rides and other open areas. Especially likes coppiced woodland. Sometimes in farmland hedgerows. It is commonest in England, Wales and S Scotland.

    When to see them
    It starts to arrive in late April and May and leaves in mid-July. Migrants can be seen through August and September when Continental birds can be seen along the east and south coasts.

    What they eat
    Insects and berries

    Read more at
    https://www.rspb.org.uk/birds-and-wildlife/bird-and-wildlife-guides/bird-a-z/g/gardenwarbler/

    All the best Jan
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    chris c
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    Re: Vindication!

    Post by chris c on Thu Jul 13 2017, 22:33

    Ah yes, they switch to berries to gain weight. Their closely related cousins Blackcaps have taken to overwintering here and may be found in gardens in autumn and winter stuffing their faces with honeysuckle berries. Well actually it turns out that "our" Blackcaps still fly south for the winter while the ones from Germany and elsewhere in Europe have taken to migrating west and ending up here.

    I've seen and heard more Garden Warblers than usual this year, they may be replacing the Willow Warblers in the south and east, too soon to tell. They have rather similar songs, especially when a Blackcap imitates a Garden Warbler, one way to tell them apart is that Blackcaps tend to be much more visible while GWs pour out their hearts while concealed. Used to be that Blackcaps preferred treetops while GWs stayed lower down but this year I've been hearing them (and occasionally seeing them) in the treetops also.

      Current date/time is Tue Sep 26 2017, 10:00