Phytoplankton plays a vital role in marine ecosystems. Apart from being a food source for marine animals, it removes carbon dioxide from the atmosphere through photosynthesis. Phytoplankton needs iron to grow. Whale poo is very rich in iron, containing 10 million times as much as seawater. Over the last century, commercial whaling has reduced the … Continue reading Whale poo is vital to the health of the Southern Ocean