Harmful algal blooms in Gulf of Mexico heighten environmental concern post BP spill

Harmful algal blooms can suck the oxygen out of the water column and mean certain death for fish, marine animals and birds, and cause toxic effects for people and local economies.

NOAA's Center for Operational Oceanographic Products and Services is providing routine HAB forecasts to help members of the public make informed decisions when a bloom is temporarily affecting their area. The forecasts also aid people responsible for responding to bloom impacts, according to NOAA's website.

Gulf of Mexico HAB Forecast - CO-OPS issues forecasts twice a week for the eastern and western Gulf of Mexico after confirmation of a HAB of the red tide species, Karenia brevis, and once weekly during the inactive bloom season. Red tide is the name for algal bloom when it is caused by a few species of dinoflagellates, a kind of aggressive plankton, and the bloom takes on a reddish color.

A bloom of some dinoflagellates can result in a discoloration of the water column (red tide), which can cause shellfish poisoning if humans consume contaminated shellfish. Some dinoflagellates also exhibit bioluminescence—primarily emitting blue-green light.

Currently, areas of the Gulf such as Padre Island in South Texas have experienced red tide, which can affect breathing quality for beach combers and kill marine life in the area.

As seen in this photo, algal blooms can contribute to what is called a dead zone, an area of hypoxia. Some dead zones occur naturally, but more and more this lack of oxygen stems from human causes - chemical runoff, for example, and the contribution to oxygen-depleting algal bloom.

PHOTO: Wikimedia Commons Images, NOAA, https://commons.wikimedia.org/wiki/File%3AGulf_dead_zone.jpg.