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Summary of
results for the 2006 breeding season.
Despite
general alarm that 2006 would turn out to be one of the worst on record
with reports in the National press and media that the Barn Owl
population had ‘crashed’ by up to 75%, this
was a case of misinterpreting ‘up to 75% of young Barn owls have
died’, into the ‘Barn Owl population has crashed by up to 75%’.
Whilst in the Southwest where the report originated it had been a
particularly bad season, this simply was not the case in Norfolk, and
ultimately the breeding season turned out to be one of mixed fortunes.
Although some established pairs did not attempt to breed conversely new
sites were occupied for the first time including boxes newly installed
the previous winter. A cold March together with May being one of the
wettest on record caused some difficulties, although the effects were
not consistent. During this time several females deserted their eggs and
some pairs although hatching young, were unable to provision these
chicks and consequently many and in some cases all chicks died and this
indicates that there was a food shortage. However other pairs were
successful in raising young, although brood sizes were generally small.
It seems that in some areas this food shortage was more pronounced than
in others hence the ability of some pairs to successfully produce some
young where other pairs failed. We visited over 400 potential nesting
sites to check the nest boxes and we recorded a total of 158 active pairs,
a further 31 sites had at least one bird roosting although breeding did
not take place. Altogether we ringed 320 chicks and 12 new adults.
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Number
of chicks/nest
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Average
no chicks/nest
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Year
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1
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2
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3
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4
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5
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6
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2006
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22
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48
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43
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16
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3
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0
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2.42
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Nest
Distribution 2006

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