Related Experiment Video
Updated: Jun 12, 2026
05:04
Visualization of Productivity Zones Based on Nitrogen Mass Balance Model in Narragansett Bay, Rhode Island
Published on: July 14, 2023
Modeling future acidification and fish populations in Norwegian surface waters
Thorjørn Larssen1, Bernard J Cosby, Espen Lund
1Norwegian Institute for Water Research, Oslo, Norway.
Environmental Science & Technology
|June 24, 2010
Summary
Acid deposition still harms ecosystems, necessitating policy revisions. Balancing emission cuts and costs determines the speed of environmental recovery, impacting aquatic life for decades.
Area of Science:
- Environmental Science
- Ecology
- Environmental Chemistry
Background:
- Acid deposition, caused by sulfur and nitrogen compounds, continues to damage European and North American environments despite past mitigation efforts.
- Existing legislation, partly based on critical loads, is under revision, prompting consideration of ecosystem response time delays.
Purpose of the Study:
- To analyze the trade-offs between emission reduction costs and the speed of ecosystem recovery from acid deposition.
- To evaluate the long-term impact of current emission reduction policies on Norwegian lake water quality and fish populations.
Main Methods:
- Review of existing environmental legislation and policy protocols regarding acid deposition.
- Analysis of the critical loads concept and its limitations, including time delays in ecosystem response.
- Case study of lake acidification and fish population health in Norway under different emission reduction scenarios.
Main Results:
- Current emission reduction strategies will lead to slow recovery of surface waters, with significant portions of Norwegian lakes remaining unsuitable for indicator organisms for decades.
- A policy trade-off exists: deeper emission cuts ensure faster ecosystem recovery but incur higher costs, while lower costs result in slower recovery.
Conclusions:
- Accelerated recovery of acidified ecosystems requires more substantial emission reductions than currently mandated.
- Policy decisions must account for the time lags between emission control and observable environmental improvements to effectively manage acid deposition impacts.
Related Concept Videos
01:30Marine Microbial Ecology
Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
02:32Osmoregulation in Fishes
When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
01:24Freshwater Microbial Ecology
Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic systems...