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The monitoring schemes
Indexing population levels
Overall influences on bird numbers
4 other sections not shown
agricultural areas Breeding Atlas breeding birds breeding population breeding season breeding success CBC data CBC Farmland CBC CBC habitats CBC index CBC plots census century Coal Tit cold winters colonisation Common Crossbill conifer Corn Bunting counts Cramp & Simmons decline decrease density rankings 1988 distribution early eastern England effects elsewhere in Europe estimate of breeding farming Farmland CBC Woodland fluctuations Garden Warbler grassland Grey Partridge Grey Wagtail hedgerows Hudson & Marchant Hustings increase index values Latest estimate long-term lowland monitoring northern numbers O'Connor & Shrubb occurred overall pairs in Britain Parslow peak Percentages of plots period plots occupied population changes population levels Present population trend recent recovery reduced Reed Bunting Reed Warblers Regional density rankings Regional variation Sahel sample Scotland Sedge Warbler severe winter Song Thrush southern England species survey Tawny Owl territories Trends elsewhere upland Wagtail WBS plots Whitethroat Willow Tit Willow Warbler