But more often than not they are mismanaged or altogether excluded from management actions and conservation laws as they are simply overlooked.” “These rivers can provide critical water and food sources for people and they play an important role in controlling water quality. “Non-perennial rivers and streams are very valuable ecosystems as they are home to many distinct species that are adapted to cycles of water presence and absence,” said study first author Mathis Messager. North America is the third-largest continent by area, following Asia and Africa, ![]() North America covers an area of about 24,709,000 square kilometers (9,540,000 square miles), about 16.5% of the Earth’s land area and about 4.8% of its total surface. Because it is on the North American Tectonic Plate, Greenland is included as part of North America geographically. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Caribbean Sea, and to the west and south by the Pacific Ocean. It can also be described as the northern subcontinent of the Americas. North America is a continent entirely within the Northern Hemisphere and almost all within the Western Hemisphere. The study has also produced a map of non-perennial rivers that provides crucial baseline information for the assessment of future changes in river flow intermittence. ![]() The research highlights the need to change the general assumption that water flows in rivers and streams year-round. The experts found that between 51 and 60 percent of the 64 million kilometers of Earth’s rushing waters run dry periodically. ![]() More than half of the world’s rivers run dry each year In a new study led by McGill University, researchers have determined that more than half of the world’s rivers and streams stop flowing for at least one day per year.
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