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National Lakes Assessment: Algae A National Issue

When it comes to harmful algal blooms (HABs) in our nation’s lakes, much of the focus gets placed on Lake Erie. And though it’s an important water body for sure, it is not the only freshwater lake in the United States. Results of the National Lakes Assessment (NLA), a first-of-its-kind survey, have just been released detailing that many of the freshwater lakes in the U.S. also have an algae problem. The assessment, which began data collection in 2007, is part of the U.S. Environmental Protection Agency’s (EPA) National Aquatic Resource Surveys . Those are collaborative programs between the EPA and states and tribes that are designed to assess the quality of waters throughout the United States, be they lakes, rivers, streams, wetlands or coastal regions.

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Flood Warning Systems

Chapter Overview: Flood Warning A Real-Time Solution Streamflow Measurements Typical Flood Warning System Monitoring Location Data Management Quality Assurance Recommended Equipment Why Monitoring Matters While some areas are more prone to flooding than others, the establishment of flood warning systems near any major waterway or body of water provides critical information that can protect property and save lives. Of course, the most effective flood warning methods extend beyond the installation of gages and telemetry equipment, and employ qualified staff and carefully designed procedures to provide the earliest warning about whether a flood should be expected, when it will occur, and how severe it will be.

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Coral Bleaching Hits Clownfish Habitat Selection

With the pace of coral bleaching picking up in recent years, prospects for fish that depend on them as habitat aren’t looking too good. Take clownfish, a species that is fiercely reliant on anemones over the course of their lives. Found exclusively in the Indo-Pacific, clownfish are symbiotic animals that only live in sea anemones, a close relative of corals that don’t have a hard outer shell. The anemone provides a home and protection for the clownfish, while the clownfish provides food for the anemone.

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Arctic Lakes Permafrost Thaw Quickens

Permafrost below shallow Arctic lakes is thawing quicker than expected as a result of changing winter climate in Alaska. Warmer winters combined with an increase in snowfall during the last 30 years have limited the growth of seasonal lake ice, scientists say, that has caused lakebed temperatures to increase. The temperatures in lakes less than 3 feet deep there have gone up by 2.4 degrees Celsius (4.3 degrees Fahrenheit) during the past three decades. But during five of the last seven years, the mean annual lakebed temperature has been above freezing. Researchers at the University of Alaska - Fairbanks made the measurements during winter field surveys in Alaska’s North Slope .

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