Canadian Forest Service Publications

ARNEWS Annual report 1993. (Rapport annuel 1993 sur le DNARPA / ARNEWS Informe Anual 1993). 1995. Hall, J.P. Natural Resources Canada, Canadian Forest Service, Headquarters, Science and Sustainable Development Directorate, Ottawa. Information Report ST-X-9. 70 p.

Year: 1995

Issued by: National Capital Region

Catalog ID: 10203

Language: English / French / Spanish

Series: Information Report (CFS - Ottawa)

Availability: PDF (download)

Mark record


The Acid Rain National Early Warning System (ARNEWS) has been in place since 1984 to detect early signs of damage to Canadian forests and to monitor changes in forest vegetation and soils. In 1993, ARNEWS was expanded to 150 plots and the methods for assessing crown condition in conifers and hardwoods were revised. ARNEWS plots are established and assessed by the Forest Insect and Disease Survey (FIDS) of the Canadian Forest Service. The role of FIDS in ARNEWS is to identify all types and degrees of damage to forests, whether caused by natural factors such as insects, diseases, and weather, or anthropogenic factors such as management practices and air pollution. The health of 20 conifer and 8 hardwood species across Canada is described. There has been no indication of a large-scale decline in forest health and few symptoms of pollution were observed. Where pollution-like symptoms occurred, they were usually accounted for by natural factors. Exceptions occur in the Bay of Fundy area of New Brunswick where dieback on birch coincides with the presence of acid fog and high levels of tropospheric ozone. Needle flecking has been observed on conifers in Nova Scotia and New Brunswick; its cause has yet to be verified.