Alexandrium

Definition

Alexandrium is a genus of dinoflagellate algae known for producing harmful algal blooms (HABs) and toxins. These toxins can cause paralytic shellfish poisoning (PSP) in humans and marine life.

5 Must Know Facts For Your Next Test

1. Alexandrium species are responsible for harmful algal blooms that can devastate marine ecosystems.
2. The toxins produced by Alexandrium, such as saxitoxins, block sodium channels in nerve cells, leading to paralysis.
3. Paralytic shellfish poisoning (PSP) occurs when humans consume shellfish contaminated with Alexandrium toxins.
4. Environmental factors like water temperature, salinity, and nutrient availability can influence the growth of Alexandrium populations.
5. Monitoring and management strategies are essential to mitigate the impact of Alexandrium on public health and fisheries.

Review Questions

• What kind of toxins does Alexandrium produce and what effect do they have?
• How can environmental conditions affect the proliferation of Alexandrium?
• What human health condition is commonly associated with consuming shellfish contaminated by Alexandrium?

Related terms

Dinoflagellates: A group of flagellate protists that are an important component of plankton.

Harmful Algal Blooms (HABs): Rapid growth of algae that can harm marine life, ecosystems, and human health.

Saxitoxins:

Neurotoxins produced by certain species of dinoflagellates, including Alexandrium.