Document Detail

Chemical and biological recovery of Lake Saudlandsvatn, a formerly highly acidified lake in southernmost Norway, in response to decreased acid deposition.
MedLine Citation:
PMID:  21669327     Owner:  NLM     Status:  In-Data-Review    
We studied acid-sensitive organisms in Lake Saudlandsvatn in southernmost Norway in relation to acidification: brown trout (Salmo trutta), the caddisfly Hydropsyche siltalai and the zooplankter Daphnia longispina. The study lake was highly acidified with episodic pH depressions <5.0 in the 1970s and 1980s, and sulphur (S) deposition five times greater than the critical load. Chemical recovery following reduced deposition of S became evident in the late 1990s, when the pH increased to 5.5-6.0. By 2000, S deposition had decreased to the critical load. The lake sustained a good brown trout population until the early 1980s, but then it started to decline and nearly went extinct ten years later. Severe recruitment failures were found in most years prior to 1995, both in the inlet and outlet stream. However, since 2003 a marked recovery of the brown trout population has occurred in the lake. During the 1980s, the H. siltalai disappeared from the lake tributaries. In 1996, the species reappeared, and increased highly in abundance from 2000 and onwards. The first post-acidification record of D. longispina from net hauls in Lake Saudlandsvatn was in 2002. Palaeolimnological data confirmed their presence prior to acidification. Any significant recovery in all three organism groups coincided with an acid-neutralizing capacity (ANC) of >20μeq L(-1) and toxic inorganic aluminium of <30μg L(-1). Projections made with the MAGIC model indicate that unless further reductions in deposition of S are made, the ANC will fluctuate around the ANC survival threshold for the biological elements described. Thus, full biological recovery will not occur in the near future.
Trygve Hesthagen; Arne Fjellheim; Ann K Schartau; Richard F Wright; Randi Saksgård; Bjørn O Rosseland
Related Documents :
8522137 - Gavaserin and saltavalin, new peptide antibiotics produced by bacillus polymyxa.
16347227 - Growth characteristics of a novel nitrogen-fixing cellulolytic bacterium.
7251487 - Dnacins, new antibiotics. i. producing organism, fermentation, and antimicrobial activi...
7944377 - Nutritional requirements for growth of helicobacter pylori.
6392477 - Mycolic acid patterns of representatives of mycobacterium bovis bcg.
6357187 - A system model of the metabolic response to stress.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Science of the total environment     Volume:  409     ISSN:  1879-1026     ISO Abbreviation:  Sci. Total Environ.     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-06-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0330500     Medline TA:  Sci Total Environ     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  2908-16     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier B.V. All rights reserved.
Norwegian Institute for Nature Research, Trondheim, Norway.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Relative importance of wastewater treatment plants and non-point sources of perfluorinated compounds...
Next Document:  Atmospheric concentrations and air-soil gas exchange of polycyclic aromatic hydrocarbons (PAHs) in r...