General breeding bird index   




Research Institute for Nature and Forest (INBO) 




General breeding bird index: this index describes the trend for a selection of general bird species since the start of the Flanders General Breeding Birds (ABV) monitoring network in 2007, for which the reference year 2007 is set at 100%. There are 3 categories: birds in agricultural areas, birds in forest areas and birds that breed in a variety of habitats, the generalists. Each indicator is based on the geometric mean of the indices of its individual species.

Species list of breeding birds in agricultural area: Barn Swallow, Yellowhammer, Yellow Wagtail, Common Whitetroat , Meadow Pipit, Black-tailed Godwit, Northern Lapwing, Common Linnet, Grey Partridge, Eurasian Tree Sparrow, European Stonechat, Eurasian Oystercatcher, Icterine Warbler, Common Kestrel, Eurasian Skylark, White Wagtail, Eurasian Curlew, Black Redstart.

Species list for breeding birds in forest area: European Pied Flycatcher, Eurasian Nuthatch, Short-toed treecreeper, Tree Pipit, Common Buzzard, Willow Warbler, Eurasian Jay, Common Redstart, Goldcrest, European Green Woodpecker, European Greenfinch, Great Spotted Woodpecker, Mistle Thrush, Stock Dove, Common Cuckoo, European Crested Tit, Northern Willow Tit, Common Nightingale, Eurasian Sparrowhawk, Common Chiffchaff, Garden Warbler, Eurasian Golden Oriole, Coal Tit, Black Woodpecker, Eurasian Blackcap.

Species list breeding birds in diverse habitats: Eurasian Magpie, Common Pheasant, European Greenfinch, Great spotted woodpecker, Dunnock, Common Wood pigeon, House sparrow, Western Jackdaw, Great tit, Common Blackbird, European Blue tit, European Robin, Common Starling, Long-tailed tit, Eurasian Collared Dove, Common Chaffinch, Eurasian Wren, Song Thrush, Carrion Crow.


Remarks on quality

The identified trends are based on standardised breeding bird counts, performed by volunteers in 1x1 km squares (UTM raster) defined in advance. Each square in the sample is counted in a 3-year cycle and the data are collected online via The evaluation of the trend is based on a statistical trend analysis. 




Research Institute for Nature and Forest (INBO): General breeding bird index