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<div id='article-page'><div id='article-content' data-media-url='//news-app-staging.s3.amazonaws.com' data-base-url='//news-app-staging.herokuapp.com' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5150/A.wav' data-capture-url='//staging.analytics.lingraphica.com/events/capture_news' data-article-title='Study: Hundreds of Lakes in US, Europe Lose Oxygen' data-article-id='5688'><script src='//news-app-staging.herokuapp.com/javascripts/getscripts.js'></script><link rel='stylesheet' href='//news-app-staging.herokuapp.com/stylesheets/article.css' type='text/css' /><div class='article'><p><span data-start-time='0' data-end-time='13563'>Researchers say oxygen levels have dropped in hundreds of lakes across the United States and Europe over the last 40 years.</span> <span data-start-time='13563' data-end-time='24521'>A new study suggests the oxygen loss can lead to more fish dying and increased algae growth.</span> <span data-start-time='24521' data-end-time='35042'>Scientists examined the temperature and the amount of dissolved oxygen in nearly 400 lakes.</span> <span data-start-time='35042' data-end-time='42375'>Dissolved oxygen is the amount of oxygen gas contained in water. </span> <span data-start-time='42375' data-end-time='48271'>They discovered widespread drops in oxygen levels.</span> <span data-start-time='48271' data-end-time='53688'>The study recently appeared in the publication Nature. </span> <span data-start-time='53688' data-end-time='69979'>It found that dissolved oxygen decreased an average of 5.5 percent in the surface water of the lakes and 18.6 percent in the deep water.</span> <span data-start-time='69979' data-end-time='84896'>The researchers say their findings suggest that warming temperatures and decreased water clarity from human activity are causing oxygen levels to fall.</span> <span data-start-time='84896' data-end-time='97333'>Craig E. Williamson is a biology professor at Miami University in the state of Ohio and a co-writer of the study. </span> <span data-start-time='97333' data-end-time='109646'>He told The Associated Press that testing for oxygen is one of the best ways to judge how healthy water systems are. </span> <span data-start-time='109646' data-end-time='117667'>The study’s findings suggest “a pronounced human footprint,” he said.</span> <span data-start-time='117667' data-end-time='126271'>That footprint includes warming caused by climate change, the researchers said. </span> <span data-start-time='126271' data-end-time='139958'>In addition, decreased water clarity can be caused by runoff from human waste systems, fertilizers, cars and power plants.</span> <span data-start-time='139958' data-end-time='148083'>Losses in dissolved oxygen in Earth’s water systems have been reported before. </span> <span data-start-time='148083' data-end-time='159396'>A 2017 study of oxygen levels in the world’s oceans showed a two percent drop since 1960. </span> <span data-start-time='159396' data-end-time='171375'>But less was known about lakes, which lost two to nine times as much oxygen as oceans, the study found.</span> <span data-start-time='171375' data-end-time='182229'>In the past, other researchers had reported oxygen decreases in individual lakes over a long period of time. </span> <span data-start-time='182229' data-end-time='191042'>But those studies did not examine as many lakes around the world, said Samuel B. Fey. </span> <span data-start-time='191042' data-end-time='198292'>He is a biology professor at Oregon’s Reed College who studies lakes. </span> <span data-start-time='198292' data-end-time='202583'>He was not involved in the latest study.</span> <span data-start-time='202583' data-end-time='214000'>Fey said an important finding was that the researchers were able to show such a notable drop in dissolved oxygen levels. </span> <span data-start-time='214000' data-end-time='222021'>Also, the drops were found at both the surface and in deep parts of the lakes.</span> <span data-start-time='222021' data-end-time='235021'>The deep water drop in oxygen levels may affect organisms that are more sensitive to temperature increases, such as cold water fish. </span> <span data-start-time='235021' data-end-time='242833'>During the summer months, they depend on cooler temperatures found in deeper water.</span> <span data-start-time='242833' data-end-time='250854'>But if deep waters are low in oxygen, the organisms struggle to survive.</span> <span data-start-time='250854' data-end-time='262042'>“Those are the conditions that sometimes lead to fish kills in water bodies,” study co-writer Kevin C. Rose said. </span> <span data-start-time='262042' data-end-time='271875'>This means that a lot of areas cold water fish depend on “could become inhospitable,” he added.</span> <span data-start-time='271875' data-end-time='284438'>Other organisms, Rose said, do better in warmer temperatures at the surface level and can get enough oxygen by remaining there.</span> <span data-start-time='284438' data-end-time='292563'>About one fourth of the lakes studied showed increasing oxygen in surface waters.</span> <span data-start-time='292563' data-end-time='303542'> Rose said this is a bad sign because it points to increased algal blooms the sudden growth of algae. </span> <span data-start-time='303542' data-end-time='318792'>In those lakes, dissolved oxygen was “very low” in deep waters, likely creating unlivable conditions for many species, the researchers said.</span> </p></div><div class='control-buttons-sticky' style='display:none;'><div class='control-buttons'><button title='Back' class='back' disabled='disabled'></button><button title='Play' class='play' disabled='disabled'></button><button title='Pause' class='pause' style='display:none;'></button><button title='Forward' class='forward' disabled='disabled'></button><button class='finished-reading' style='display:none;'>Done</button></div></div></div><div id='article-media'><div id='media-image'><img src='https://news-app-production.s3.amazonaws.com/articles/5150/A.jpeg'/></div></div><div id='question-content' style='display:none;'><div class='vocabulary_question question-container' data-question-id=17566 data-hint-location='13563' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5150/what_is_algae.wav'>What is algae?</div><div class='choices' data-correct-choice='a simple, nonflowering, and typically aquatic plant'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5150/a_simple_nonflowering_and_typically_aquatic_plant.wav'><span>a simple, nonflowering, and typically aquatic plant</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5150/a_story_poem_or_picture_that_can_be_interpreted_to_reveal_a_hidden_meaning_typically_a_moral_or_political_one.wav'><span>a story, poem, or picture that can be interpreted to reveal a hidden meaning, typically a moral or political one</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5150/a_portable_platform_on_which_goods_can_be_moved_stacked_and_stored_especially_with_the_aid_of_a_forklift.wav'><span>a portable platform on which goods can be moved, stacked, and stored, especially with the aid of a forklift</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5150/a_layer_of_dirt_or_froth_on_the_surface_of_a_liquid.wav'><span>a layer of dirt or froth on the surface of a liquid</span></div></div></div><div class='multiple_choice_question question-container' data-question-id=17567 data-hint-location='53688' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5150/what_do_researchers_say_are_causing_the_levels_to_fall.wav'>What do researchers say are causing the levels to fall?</div><div class='choices' data-correct-choice='Warming temperatures and decreased water clarity from human activity'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5150/warming_temperatures_and_decreased_water_clarity_from_human_activity.wav'><span>Warming temperatures and decreased water clarity from human activity</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5150/an_increase_in_predator_fish.wav'><span>An increase in predator fish</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5150/polar_bear_migration.wav'><span>Polar bear migration</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5150/firehouses_using_too_much_water_from_lakes.wav'><span>Firehouses using too much water from lakes</span></div></div></div><div class='sentence_completion_question question-container' data-question-id=17568 data-hint-location='235021' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5150/during_the_summer_months_they_depend_on_cooler_temperatures_found_in__blank__water.wav'>During the summer months, they depend on cooler temperatures found in <span class='blank'>deeper</span> water.</div><div class='choices' data-correct-choice='deeper'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5150/deeper.wav'><span>deeper</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5150/bluer.wav'><span>bluer</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5150/acidic.wav'><span>acidic</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5150/drinking.wav'><span>drinking</span></div></div></div><div class='question-buttons'><button class='skip-button'></button><button class='hint-button'></button><button class='speak-button'></button></div></div></div>
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