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Nature Notes |
This page contains occasional notes and jottings of things that take my interest, starting
with some thoughts on declining biodiversity
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Did you know that there are deserts in our countryside? Read on...
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Ah... the memories of summer as a child, long grass, bright flowers, secret dens, sunny days,
butterflies and the heavy drone of bumblebees. There as been a lot of interest in bumblebees
this year - BBC,
RSPB,
BRISC,
Rothamstead - because
those species found in open country, such as flower meadows, heaths, coasts, etc, have declined
significantly over recent years
(see Williams, for example).
Prompted by this activity I decided to take a look at the bumblebees in my garden.
Just 1/2 hour demonstrated to me how tricky this can be - they move, they're variable,
their colours wear off and there are similar looking insects, especially cuckoo bees and
hoverflies.
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Although, several of the interest groups have produced handy guides, they tend to be
unsuitable in some way - restricted geography, only common species, etc - and the
supporting text is not summarised for easy field use. My field guide was simply too clumsy.
So, I decided to produce my own crib sheet, which you can
download if you’d like to try it.
Of course I am not an expert. The information used to derive the crib sheet was obtained from
various sources on the web and various guides and articles, but any mistakes are my
own.
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Two of the best sites I have found for general information on bumblebees and more in-depth
help with identification are:
BRISC (Biological Recording in Scotland); and
The Bumblebee Pages
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When I went looking for bumblebees in the garden almost the first I saw was actually
a cuckoo bumblebee, Psithyrus vestalis, and there were lots of them!
Elsewhere I found the hoverfly bumblebee mimic, Volucella bombylans. So I though a second
crib sheet for bumblebee mimics would be useful.
You can also follow the links to some good websites for further information on
cuckoo bumblebees,
solitary bees,
hoverflies and bee-flies.
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Clematis vitalba decks out the winter hedgerows and woodland edges in some parts of the
country with silvery seed heads. Not to everyone's taste but an interesting plant nonetheless.
This is an article I was invited to write for
British Clematis Society magazine.
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Another article for the British Clematis
Society magazine. This one describes the mechanisms by which plants climb, focussing on the
twining leaflet stalks of Clematis.
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The White-winged Snowfinch is a sparrow that spends its whole life in alpine country at high altitude.
It does not descend even in adverse weather. Here we
explore how the snowfinch, and other small birds that choose not to migrate, survive the cold.
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Unlike birds, plants cannot fly off to sunny climes, find a sheltered bolt hole, huddle together or heat themselves up
to beat the cold, yet they can prosper in very harsh environments where cold stress during the winter is very intense.
So how do they do it? We first take a look at ice and icey weather before looking at the tricks plants use to overcome
it.
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