The development of small hydropower dams is widespread throughout Brazil and elsewhere in the world, vastly overshadowing large hydropower projects. The proliferation of these smaller dams is a response to growing energy and security needs. Their expansion, however, threatens many of the remaining free-flowing rivers and biodiverse tropical regions of the world — interrupting the migrations of freshwater fishes, on which millions of peoples’ livelihoods depend.
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Healthy ecosystems buzzing with life are more than something pretty to look at – they are critically important to our health and wellbeing. Ecosystems deliver goods and services that humans need – like fresh water, protection from the elements and food for our dinner tables – and it’s in our best interest to make sure they remain vibrant and thriving for future generations.
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Fish populations tend to do better in places where rigorous fisheries management practices are used, and the more measures employed, the better for fish populations and food production, according to a new paper published Jan. 11 in Nature Sustainability. The study, led by Michael Melnychuk of the University of Washington’s School of Aquatic and Fishery Sciences, draws upon the expertise of more than two dozen researchers from 17 regions around the world.
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Changing climate has far-reaching impacts, and is testing parts of society’s ability to continue doing business-as-usual. Among these are water utilities, the entities responsible for delivering clean, fresh water to our nation’s households and managing wastewater and stormwater. Climate change affects not only rainfall and annual precipitation patterns—which has implications on the availability of freshwater—but can also stress the infrastructure and systems used to treat, deliver and manage water resources.
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In a first-of-its-kind study published in Nature, scientists report on the conservation status of reef shark populations worldwide. The results are grim; reef sharks have become rare at numerous locations that used to be prime habitat, and in some cases sharks may be absent altogether. A long history of human exploitation is the culprit, with depleted shark populations strongly tied to socio-economic conditions, lack of governance and the proximity of reef environments to large human population centers.
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