Pollution algal bloom

The virus-associated mass mortalities that took place among marine mammals in the 1980s and 1990s elicited an interest in co-factors that may have contributed to the severity of these events. The deaths of 20,000 harbor and several hundred grey seals in northern Europe in 1988 prompted questions about climate change, algal blooms, environmental pollutants, exotic diseases and other perceived stressors [54], After the identification of a newly described virus, phocine distemper virus (PDV) [55], concern still lingered that immunotoxic environmental contaminants could have facilitated the outbreak. 

A continuing problem in water treatment is the occurrence of algal blooms. Algae may be killed relatively easily on exposure to ultrasound and a lightly polluted system... 

Biological Pollutants Harmful algal blooms Stimulation of the growth of algae and bacteria that synthesize biotoxins Biotoxins are generaiiy neurotoxic. 

It s hard to overestimate the damage to the environment that has been wrought by agricultural intensification during the last half-century. Precious landscape features, such as prairies, wetlands, and old fencerows, have been destroyed on a massive scale. Overuse of fertilizers has polluted lakes and rivers, in many cases choking them almost to death through the proliferation of algal blooms and aquatic weeds. Pesticides are everywhere in... 

The discharge of organic pollutants into lakes or declines in the concentrations of copper, zinc, and other heavy metal toxins may promote the growth of phytoplankton (e.g. algal blooms ). Greater biological activity may then increase anoxic conditions in lake bottoms, which stimulate the reductive dissolution of (oxy)(hydr)oxides and increase the mobilization of arsenic. In particular, Martin and Pedersen (2002) concluded that reduced discharges of copper, zinc, and nickel to Balmer Lake, Ontario, Canada, increased phytoplankton production and arsenic mobility in the lake. 

Lenanton, R.C., Longeragan, N.R., and Potter, I. (1985) Blue-green algal blooms and the commercial fishery of a large Australian estuary. Mar. Pollut. Bull. 16, 477-482. 

Effects in feral populations are not only much more difficult to observe and ascertain, but also very unlikely to be caused by a single cause, like pollution by a single group of contaminants. Many other factors can play a role, such as temperature, population densities and toxic algal blooms, which impede efforts to link causally the effects observed to pollution. They may also be caused by a combined effect of the presence of PCBs, PCDD/Fs, DDTs, drins and HCB.80... 

An excess of nutrients, such as phosphorus and nitrogen in polluted water, will lead to an excessive growth of plant matter in waterways and algal blooms. Besides clogging waterways and adding toxins, this extra plant material contributes to the BOD of the water. 

Lancelot, C. (1990) Phaeocystis blooms in die continental coastal area of die Channel and die North Sea, in Eutrophication and algal blooms in North Sea coastal zones, the Baltic and adjacent areas prediction and assessment of preventive actions (eds C. Lancelot, G. Billen and H. Barth) Commission of die European Communities, Brussels, Water Pollution Research Report, 12, pp. 27—54. 

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