Impact Type: Deposition of pollutant
There is evidence to suggest that some small passerine birds such as Tits can be affected by acid deposition primarily by reducing soil Ca2+ availability and the abundance of calcareous items such as snail shells. Recent research in areas adversely affected by acid deposition in continental Europe has suggested that reduced calcium availability has resulted in an increased incidence of eggshell defects in small birds (Pyatt et al. 1998, Weimer & Schmidt 1998). Research by Ramsay & Houston (1999) in the UK failed to support the view that reduced calcium availability was causing egg shell defects in blue tits. However, there is evidence to show that SO2 can have an effect on the food supply and quality of several species of Tit.
Changes and loss of habitats through housing developments may be of greater concern.
|Critical Load/ Level|
No estimate available