June 16, 2017 Volume 23, Number 24 |
Research and Education |
General Interest |
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Phytoplankton Emiliania huxleyi turn the Black Sea and Bosphorus Strait Turquoise | |
'Plankton explosion' turns Istanbul's Bosphorus turquoise Phytoplankton Have Turned The Bosphorus A Stunning Turquoise Turquoise Swirls in the Black Sea Plankton Portal Pan genome of the phytoplankton Emiliania underpins its global distribution Art Meets Science in a Book Called Bloom This past weekend, residents of Istanbul, Turkey noticed that the Bosphorus Strait that divides the continents of Europe and Asia appeared unusually turquoise in hue. They were not alone in this observation; on May 29th, NASA's Moderate Resolution Imaging Spectroradiometer (MODIS) discovered turquoise-colored swirls in the Black Sea. This striking color change is caused by an explosive growth of phytoplankton, a sort of plankton that creates their food via photosynthesis. Phytoplankton sometimes grow in sudden bursts, known as "blooms." NASA explains that one type of phytoplankton, coccolithophores, are "plated with white calcium carbonate and, when present in large numbers, tend to turn the water a milky sheen." This milky sheen, in turn, causes the hosting body of water to appear turquoise. Ahmet Cemal Saydam, a professor of environmental science at Hacettepe University in Ankara, Turkey, explains that the coccolithophores currently coloring the Black Sea and Bosphorus Strait are a species called Emiliania huxleyi. This single-cell organism is not only benign, but may also boost this year's number of anchovies. As Saydam notes, "Across the Black Sea there is an explosion of Emiliania huxleyi. This is a blessing for the Black Sea." [MMB] The first two links take readers to articles from The Guardian and NPR, respectively, about the atypical appearance of the Bosphorus Strait and its cause. Next, readers will find a June 11, 2017 report from NASA's Earth Observatory that details NASA's observations of the Black Sea. In this report, readers will also find links to NASA reports from previous years detailing phytoplankton-caused changes in the Black Sea. As the site notes, these phytoplankton blooms, and subsequent turquoise waters, are not unusual in May and June. Moving along, the next link takes readers to the Plankton Portal, a citizen science project centered on identifying plankton in the Mediterranean and California currents. The accompanying field guide to this project may serves as a useful educational resource. Next, those interested in learning more about the particular species of plankton coloring the Black Sea can check out a July 2013 Nature article that explores the characteristics that enable Emiliana huxleyi to thrive in a number of diverse environments around the world. Finally, the last link takes readers to a 2013 book review in Oceanus Magazine of Bloom, a UNIQUE book authored by biologist Elizabeth Halliday and graphic designer and book artist Janine Wong. Halliday and Wong partnered as part of a project called Synergy, which facilitated collaboration between artists and scientists. Bloom features poetry and images inspired by phytoplankton blooms. |