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  • June 27, 2017 - Thessaloniki, Greece - Red tide phenomenon caused by algal blooms in Thessaloniki, Greece, on June 27, 2017 , a discoloration of coastal waters due to large algal blooms. Red tide is a common name for a phenomenon known as an algal bloom, caused by species of dinoflagellates, taking on a red or brown color. The most conspicuous effects of these kinds of red tides are associated wildlife mortalities of marine and coastal species of fish, birds, marine mammals, and other organisms. (Credit Image: © Grigoris Siamidis/NurPhoto via ZUMA Press)
    20170627_zaa_n230_491.jpg
  • Jun 12, 2017 - Space - Most summers, jewel-toned hues appear in the Black Sea. The turquoise swirls are not the brushstrokes of a painting; they indicate the presence of phytoplankton, which trace the flow of water currents and eddies. On May 29, 2017, the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Aqua satellite captured the data for this image of an ongoing phytoplankton bloom in the Black Sea. The image is a mosaic, composed from multiple satellite passes over the region. Phytoplankton are floating, microscopic organisms that make their own food from sunlight and dissolved nutrients. Here, ample water flow from rivers like the Danube and Dnieper carries nutrients to the Black Sea. In general, phytoplankton support fish, shellfish, and other marine organisms. But large, frequent blooms can lead to eutrophication, the loss of oxygen from the water and end up suffocating marine life. One type of phytoplankton commonly found in the Black Sea are coccolithophores, microscopic plankton that are plated with white calcium carbonate. When aggregated in large numbers, these reflective plates are easily visible from space as bright, milky water. (Credit Image: © Norman Kuring/NASA via ZUMA Wire/ZUMAPRESS.com)
    20170612_sha_z03_281.jpg