A group of
Capercaillie experts and enthusiasts have been visiting two Highland estates to
find out why numbers of the rare species are increasing in the face of serious
declines in other parts of Scotland.
Earlier this month, the Friends of Capercaillie were invited to visit Inshriach Forest, owned by Forestry Commission
Scotland, and the privately owned Glenfeshie Estate. Across Scotland — the only place in Britain where
Capercaillie are found — there are thought to be fewer than 1,300
of these magnificent turkey-sized birds remaining. Nationally they appear to be
declining still further in their former strongholds such as Deeside, but the
Speyside population is holding up well and even increasing on some sites, in
spite of 'challenging' summer weather that affects productivity.
Only 9 lekking
cocks were counted in 2006, but lek counts this year reported 33 cocks across
Inshriach and at Glenmore, the Commission's other forest in the area. Graeme
Prest, who manages Forestry Commission Scotland's Inverness,
Ross & Skye District, said: "Numbers in Inshriach have increased — and
the increase is impressive considering the big declines over much of the rest
of the range. Something appears to being working well here for Capercaillie — and
we were keen to show the 'Friends' what we have been doing and the impact it
appears to be having. Much of that success seems to come down to the fact that
we are learning how to manage our multi-purpose Scots pine forests in ways that
allow us to strike a balance between the needs of Capercaillie and the demands
of timber production and recreation. It's a fairly new way of working that
demonstrates that, with careful planning, Capercaillie populations can thrive
in forests that produce timber. It appears to have achieved some very positive
results. There is still work to do but we hope the Friends will get some ideas
of what measures might be taken in other areas to try to help reverse the
decline of caper populations."
Capercaillie
The Capercaillie -Tetrao urogallus - also known as the Wood
Grouse, Heather Cock or Western Capercaillie , is the largest member of the
grouse family. The largest known specimen, recorded in captivity, had a weight of
7.2 kg. (15.9 lbs). It is a sedentary species, breeding across
northern parts of Europe and western and central Asia
in mature conifer forests.
Description
Male and female can
easily be differentiated by their size and colouration. The male bird is much
bigger than the female. The larger wild cocks can attain a length of
100 cm (39 in) and weight of 6.7 kg (15 lb). The body
feathers are coloured dark grey to dark brown, while the breast feathers are
dark metallic green. The belly and undertail coverts vary from black to white
depending on race.
The hen is much
smaller, weighing about half as much as the cock. Feathers on the upper parts
are brown with black and silver barring, on the underside they are more light
and buffish-yellow.
Both sexes have a
white spot on the wing bow. They have feathered legs, especially in the cold
season for protection against cold. Their toe rows of small, elongated horn
tacks provide a snowshoe.
There is a bright
red spot of naked skin above each eye. The small chicks resemble the hen in
their cryptic colouration, which is a passive protection against predators. They
have black crown feathers.
Food
The Capercaillie
is a highly specialized herbivore.They mainly feed on Vaccinium species,
especially blueberry. Food types include buds, leaves, insects, grasses and in
the winter mostly conifer needles.
Breeding
The courting
season of the Capercaillie starts according to spring weather progress, between
March and April and lasts until May or June. Three-quarters of this long
courting season is mere territorial competition between neighbouring cocks or
cocks on the same courting ground. Hens arrive at the leks at the end of the
courting season. About three days after copulation the hen starts laying eggs.
Within 10 days the clutch is full, the average clutch size is eight eggs but
may amount up to 12, rarely only four or five eggs. The subsequent breeding
lasts about 26–28 days according to weather and altitude. At an age of 3–4
weeks they are able to perform their first short flights, from this time on
they start to sleep in trees in warm nights. At an age of about 6 weeks they
are fully able to maintain their body temperature.
Conservation Status – Least Concern
The Scottish
population became extict, but has been reintroduced from the Swedish
population. In Germany
it is on the "Red list" as a species threatened by extinction. The
most serious threats to the species are habitat degradation, particularly
conversion of diverse native forest into often single-species timber
plantations.
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