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http://hdl.handle.net/1956/2598
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| Title: | Tracing recovery from acidification in the Western Norwegian nausta watershed |
| Authors: | Halvorsen, Godtfred A.
Heegaard, Einar
Fjellheim, Arne
Raddum, Gunnar G. |
| Issue Date: | 2003 |
| Publisher: | Royal Swedish Academy of Sciences |
| Citation: | First published in Ambio 32 (3): 235-239 |
| Abstract: | A novel method, redundancy analysis (RDA), has been
used to examine whether chemical recovery from acidification
in the western Norwegian Nausta watershed produces
detectable recovery within the community structure of the
macro-zoobenthos. The RDA results have been compared
with measures of recovery based on the changes detected
using highly specialized and regionally defined biological
acidity indices. We found that the beginning of biological
recovery in the Nausta watershed was recognizable during
the period 1989–1998. Recovery occurred in the upper
reaches and in the tributaries. The multivariate approach
proved to complement the acidity indices approach, and
much biological information can be gained by their
combined use. The RDA method is conservative, i.e. does
not overestimate biological recovery, and it is not geographically
constrained as are the acidity indices. We also
found that seasonal climatic factors strongly influence the
benthic community, and may confound the detection of the
biological recovery process. |
| URI: | http://hdl.handle.net/1956/2598 |
| ISSN: | 0044-7447
http://dx.doi.org/10.1043/0044-7447(2003)032(0235:TRFAIT)2.0.CO;2 |
| Appears in Collections: | Ecological and Environmental Change Research Group (EECRG)
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