Status
The Goldcrest has a large range, estimated at 13.2 million km2 (5.1 million mi2) and a total population estimated at 80–200 million individuals, and it is therefore classed as Least Concern on the IUCN Red List. There was some northward range expansion in Scotland, Belgium, Norway, and Finland during the 20th century, assisted by the spread of conifer plantations. The population is currently stable, although there may be temporary marked declines in harsh winters.
Although dense conifer growth can provide shelter for roosting at night, losses in hard winters can be heavy. In a Finnish study, only one-tenth of the wintering Goldcrest population, which mainly fed on spiders, survived to spring. Each group roamed within a defined winter territory, and their winter survival depended on the density of the food supply. For these northern birds there is a trade off between staying put and risking starvation, or facing the perils of migration. Even in somewhat milder regions, where over-wintering is normal, exceptionally cold winters can cause such heavy losses that breeding populations take several years to recover. In 1930, the English ornithologist Thomas Coward wrote:
Until the severe winter of 1916–17 the Goldcrest was abundant and widespread, nesting in all the wooded portions of our islands; in 1920 it could have little more than an obituary notice, for the nesting stock was practically "wiped out. " ...and for some years, even as a winter visitor, the Goldcrest remained rare, absent from most of its nesting haunts. It is, however, now fully re-established.
Conversely, populations can expand rapidly after a series of mild winters. In lowland Britain, there was an increase of 48% following the 1970/71 winter, with many pairs spreading into deciduous woodlands where they would not normally breed.
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