An important labour market development towards the end of the nineteenth century was the rise of the internal labour market. Railway companies were pioneers in this area, and this article presents an analysis of the career histories of 848 traffic staff workers of the Great Eastern Railway Company. This large longitudinal sample provides the first detailed account of the internal labour dynamics of a pre‐1914 railway company, providing a unique insight into an early internal labour market. It shows that there was a clearly structured market for unskilled entrants, that promotion and demotion were an important managerial tool, and that there was a significant wage premium for promotion.
The effects of community dynamics in birds on the optimisation of their migratory strategies is a neglected area. For three years, we captured migrating warblers on autumn passage at a coastal site in western Britain. We used canonical correspondence analysis (CCA) to assess spatio‐temporal patterns of occurrence, and principal components analysis (PCA) to assess morphological variation. We calculated Euclidean distance in ordination and morphological space to assess separation between species pairs, and used Monte‐Carlo simulations to assess the probability of pattern occurring by chance. Ordination revealed five species‐groups separated by habitat type and time of passage. Reed Warbler Acrocephalus scirpaceus and Sedge
Warbler A. schoenobaenus (Group 1) occurred in wet habitats and
peaked simultaneously. In drier habitats with scrub, a first wave of
Blackcap Sylvia atricapilla (Group 2) significantly preceded
Grasshopper Warbler Locustella naevia, Willow Warbler
Phylloscopus trochilus, Whitethroat Sylvia communis and
Lesser Whitethroat Sylvia curruca (Group 3), which in all but one
case (Lesser Whitethroat) significantly preceded Garden Warbler Sylvia
borin (Group 4); peak numbers of Chiffchaffs Phylloscopus
collybita and a second wave of Blackcaps (Group 5) occurred later
still. Age effects were found only in Acrocephalus, with adults peaking before juveniles. For seven out of eight pairings within genera, separation in time of passage increased significantly in species that were morphologically similar. The only exception was Blackcap and Lesser Whitethroat which differed substantially in both passage time and morphology. Monte‐Carlo simulations showed that chance was unlikely to be responsible for ordination patterns, nor for inter‐specific variation in passage time and its relationship with species morphology. These data provide annually consistent evidence that migrating sylviid warblers are separated ecologically by habitat use, time of passage and morphology: we cannot refute the hypothesis that community dynamics have influenced niche use and autumn migratory strategy. We call for further tests of the ‘migrant interaction’ hypothesis in other geographical locations and taxa, particularly where migrants are allopatric and interact ecologically only on migration.
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