Post‐fledging dispersal of British Pied WagtailsMotacilla alba yarrellii

Dispersal and return rates of Willow WarblersPhylloscopus trochilusin relation to age, sex and season

“…In contrast the Pied Wagtail Motacilla alba yarrelli, a partial migrant, did not show a southern bias to movements until 90 days of age (Dougall 1992).…”

Long-term changes in the abundance of passerines in Britain and Ireland as measured by constant effort mist-netting

“…25 In drier summers, insects and water may be more concentrated in wet habitats than during damper summers when they are likely to be more widespread. Young passerines are thought to be highly mobile shortly after attaining independence [26][27][28] and therefore redistribution over a range of potential habitat types is possible. Interpretation of the differences in the changes in catches between wet and dry habitats requires further investigation and will be considered elsewhere.…”

Timing of autumn migration of Pied WagtailsMotacilla alba yarrellii, in northern Britain

“…In the British Isles, Pied Wagtails from northern and upland areas tend to move southwards to winter within Britain, or overseas (Davis 1966, Dougall 1991. Dougall (1992) showed that immature (first autumn) Pied Wagtails from north of 52° 00' N tended to move earlier and further than their southern counterparts. Murray (1992) noted that 67.7% of Pied Wagtails trapped (n = 133) at an autumn roost in southern Scotland, were first years and commented that 'the adults migrate well in advance of the young'.…”

“…This is probably the result of the smaller proportion of adults in the autumn population at large but may also reflect the greater life experience of adults allowing them to avoid both capture in mist-nests or death or injury resulting in a recovery. Nevertheless, it is instructive to look at the data from two viewpoints: 1) calendar date of recovery (rather than time after ringing, as described by Dougall (1991Dougall ( , 1992; and 2) rate of movement between ringing and recovery. The major problem with rate of movement is that, when a bird is reported, it is not known how long it has been at its finding location before being found; nor how long it remained at its ringing site before departure.…”