Question

Sometimes algal blooms can be observed in the oceans . Find out the reason behind the occurrence of algal bloom

Answer 1

Explanation:

Algal blooms can be caused by naturally-occurring ocean nutrients like nitrogen, so blooms can happen when ocean upwelling bring these nutrients from deeper, colder waters to the surface. ... Thousands of seabirds and seals have died during coastal algal blooms.

Some algal blooms are the result of an excess of nutrients (particularly phosphorus and nitrogen) into waters and higher concentrations of these nutrients in water cause increased growth of algae and green plants. As more algae and plants grow, others die

Answer 2

Algal blooms are the extensive growth of algae mostly cyanophycean species in water bodies due to the presence of high concentrations of nutrients such as phosphorous and nitrogen from external sources like Industrial effluents, Agricultural fertilisers etc.

• Algal bloom depletes the oxygen level in the water and blocks the sunlight from reaching other organisms thriving in deeper layers.
• leads to the discolouration of aquatic bodies and generates a foul smell.
• The photosynthetic pigments in the algal cells usually determine the colour of the bloom. Depending on the organism and its pigment the colour varies from green, blue, red and golden. For example, the algal bloom caused by Cyanophycean members is bluish-green in colour.
• This process is sometimes called eutrophication.
• Marine algal blooms caused by Gyrodinium aureolum, Dinophysis, Chaetoceros etc are toxic in nature and can lead to fish and other marine life mortalities.
• It is sometimes the turbulent storms that churn the ocean and add nutrients to the sunlit waters near the surface.