Bioindicators of Aquatic Ecosystem Stress  
   Biological indicators have been developed and applied at field sites in the eastern U.S. to assess the effects that environmental stressors such as contaminants have on the health of aquatic organisms. (Environmental Sciences Division at Oak Ridge Nation
   http://www.esd.ornl.gov/programs/bioindicators/

Aquatic Network  
   Aquatic world information on aquaculture, conservation, education, fisheries, limnology, oceanography, ocean engineering, maritime heritage, and seafood. Online store.
   http://www.aquanet.com/

Canada's Aquatic Environments  
   Featuring the habitats, animals, and plants of Canada's oceans, rivers, lakes, and wetlands. University of Guelph.
   http://www.aquatic.uoguelph.ca/

Potholes and Vernal Pools as Potential Indicator Systems  
   A technical article by Tim B. Graham about climate change and ephemeral pool ecosystems, with photographs.
   http://geochange.er.usgs.gov/sw/impacts/biology/vernal/

Environment Canada: Aquatic Ecosystems  
   Part of the Fresh Water web site.
   http://www.ec.gc.ca/water/en/nature/aqua/e_aqua.htm

Biological Markers of Water Pollution  
   A review of the literature on the use of enzyme induction in aquatic organisms to measure environmental pollution.
   http://www.brighton73.freeserve.co.uk/tomsplace/scientific/msc-thesis/mst-revi.htm

Research Group of Experimental Zooplankton Ecology  
   A research group in Finland; studies on zooplankton, cyanobacteria, fish and blue mussels in the Baltic Sea -- staff, projects, publications.
   http://haavi.fimr.fi/ezeco/

Aquatic Ecology Page  
   Guide to aquatic life and ecology resources on the Internet, with sections on algae, plants, animals and aquatic ecosystems.
   http://www.nysfola.org/alinks/