Algal bloom :- An algal bloom occurs when the numbers of algal cells increase rapidly to reach concentrations usually high enough to be visible to the naked eye. This high growth reproduction require favourable conditions such as high ...
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Page describes aspect such as what are harmful algal blooms? , How toxic algal bloom occurs? Species Responsible for Harmful Algal Blooms, Trophic Linkages between HABs and Their Ecosystems etc. with links to the same.
URL: http://www.whoi.edu/redtide/whathabs/whathabs.html

Most harmful algal blooms seem to appear from nowhere-it appears that they are suddenly there! In some ways this is true, but in other ways it isn't. The page describes, basic biology about how algae grow and form harmful blooms.
URL: From http://www.nwfsc.noaa.gov

Human exposure to naturally occurring marine toxins has been associated with a range of neurobehavioral abnormalities. The toxins are produced by harmful algal blooms (HABs) and are typically contracted through seafood consumption. This review is intended to introduce an emerging area of study linking HAB illnesses with neuropsychological changes.
URL: From http://www.rsmas.miami.edu

The page provide general information on harmful Cyanobacterial algal blooms and deals with the aspect such as how they form, species of cyanobacteria that form CyanoHABs, Cyanotoxins, How to protect from exposure to CyanoHABs etc.
URL: From http://www.cdc.gov

The killers are toxic dinoflagellates, members of a class of nearly 2,000 single-celled organisms found in the sea, lakes, and polar ice. When conditions are right, dinoflagellate populations skyrocket, forming dense colored blooms that vividly stain the water they swim in and turn it opaque as paint. Most of these “red tides” are harmless, but they can turn catastrophic.
URL: http://www.tomgidwitz.com/main/tides.htm

The phenomenon of algal bloom due to Trichodesmium erythrium, a blue-green algae, is well known on the northwest coast of India. Initiation takes place sometime in the end of February, reaches a peak by the third week of March, and then generally declines by the end of April.
URL: From http://disc.gsfc.nasa.gov

Harmful Algal Blooms [HABs] naturally appear in cold temperate to tropical waters worldwide. They are caused by certain types of microscopic algaes, collectively known as phytoplankton. Normally, these tiny plants serve as the base food group for the marine food chain. When they accumulate in a higher-than-normal concentration, however, they produce a "bloom" that releases poisons into the water.
URL: http://www.sciencentral.com/articles/view.php3?language=english&type=&article_id=218391334

Among the thousands of species of microscopic algae at the base of the marine food chain are a few dozen which produce potent toxins. These species make their presence known in many ways, ranging from massive "red tides" or blooms of cells that discolor the water, to dilute, inconspicuous concentrations of cells noticed only because of the harm caused by their highly potent toxins.
URL: From http://www.redtide.whoi.edu

An algal bloom is a relatively rapid increase in the population of (usually) phytoplankton algae in an aquatic system. Typically only one or a few species are involved and the bloom is recognized by discoloration of the water resulting from the high density of pigmented cells.
URL: http://en.wikipedia.org/wiki/Algal_bloom