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What percent of earth's water is fresh? What are sources of freshwater? What is groundwater and how is it formed? Covers these questions and more in this discussion of water's characteristics, the water cycle, and freshwater's importance. Concludes with a quiz.
(Source: DCMP)
Freshwater mussel species are critical to river ecosystems. But, many species are in trouble. Nearly 70% of freshwater mussel species are considered threatened in some way, according to zoologist Caryn Vaughn at the University of Oklahoma. With support from the National Science Foundation, Vaughn studies the role mussels play in freshwater ecosystems. They work hard filtering impurities from the water. The major problem for freshwater mussels now is habitat fragmentation and channelization by dams.
The Large Lakes Observatory (LLO) helps an interdisciplinary group of scientists use oceanographic research approaches to investigate the mysteries of large lakes. With support from the National Science Foundation, LLO scientists work to better understand the biology, chemistry, physics, and geology of these bodies of water. In the summer of 2011, LLO scientists completed a 17- day research cruise on Lakes Superior, Huron, and Erie, focusing on how a buildup of nitrates may impact the ecology of all the Great Lakes. They say a greater understanding of lakes will ultimately improve our management and conservation efforts.
Investigates both saltwater and freshwater biomes. Explores how ocean temperature, salinity, and depth affect the enormous diversity of marine life. Covers the intertidal, neritic, and open ocean zones and their characteristics. Also examines estuaries and freshwater biomes such as streams, lakes, and ponds. Defines terms and concepts, and reviews content before a quiz.
Salt marshes, bogs, swamps, and freshwater marshes are examples of wetlands, each one home to wide varieties of plant and animal life. This type of biome is a complex ecosystem that benefits people and upon which humans have had destructive impact.
In this episode, host Emily Graslie interviews conservation scientist Dr. Lesley de Souza. She is working with the people of Guyana to establish a new protected area. Their goal is to safeguard a watershed for animals like the arapaima, one of the largest freshwater fish in the world. Part of "The Brain Scoop" series.
After the end of the last ice age 10,000 years ago, populations of marine stickleback fish became stranded in freshwater lakes dotted throughout the Northern Hemisphere in places of natural beauty like Alaska and British Columbia. These little fish have adapted and thrive, living permanently in a freshwater environment drastically different than the ocean. Stickleback bodies have undergone a dramatic transformation, some populations completely losing long projecting body spines that defend them from large predators. Various scientists, including David Kingsley and Michael Bell, have studied living populations of threespine sticklebacks, identified key genes and genetic switches in the evolution of body transformation, and even documented the evolutionary change over thousands of years by studying a remarkable fossil record from the site of an ancient lake ten million years ago.
Students investigate the wide array of fish found on the planet. Concepts and terminology include saltwater, freshwater, cold-blooded, fins, backbone, eggs, scales, and gills.
Divers in Florida explore a labyrinth of treacherous caves as they attempt to map the state’s freshwater resources. Segment of video from Wild Chronicles Series.
This UNC TV segment explores the intricate interactions between organisms which are the building blocks of the freshwater ecosystem. These include the relationships between insects and the environment, predator and prey, water and organic waste, and nutrients and underground channels.
The biosphere is a thin zone of land, air, and water that is home to all living things on earth. Discusses its features as well as characteristics of ecosystems and biomes, including biotic and abiotic components. Also covers types of terrestrial and aquatic biomes, and how ecosystems can change through a process called succession. Defines terminology, and concludes with a summary and quiz.
The Tennessee Aquarium in Chattanooga is a unique freshwater aquarium. Visitors learn how a river is formed, how fish live beneath its surface, and other fish facts. Showcases important world rivers and their fish. Introduces aquarium workers, food preparation, the quarantine area, and a control center. Notes the aquarium is a learning place from top to bottom.
Jeff Corwin embarks on an amazing journey along the Mae Klong River in Thailand to see the elusive and mysterious freshwater giant stingray. Collaborating with local scientist Dr. Nantarika Chansue, Jeff and the team catch a huge 800-pound stingray for their research and monitoring project. During the health exam, the team discovers this stingray is pregnant ensuring future generations of this amazing species. Part of the "Ocean Mysteries" series.
In this program, viewers will travel the world and learn about the diversity of plants throughout the various land regions around the world. Graphics, animation, and live-action footage will assist students in identifying characteristics of various habitats on Earth. Students will learn how plants have adapted to live in polar regions, tundra, desert, grasslands, forests, and salt and freshwater habitats. Part of the "Way Cool Science" series.
Many species of fish, including those that are important to the U.S. economy, migrate from the ocean to freshwater rivers and streams to spawn. If they make it past strong river currents and hungry predators, these determined fish may then find themselves blocked by man-made barriers, such as dams. Special “fish ladders” are built to help fish pass over these dams so they can continue swimming upstream to reach their spawning grounds.
Part of the "Branches on the Tree of Life" series. Worms with segmented bodies make up the phylum Annelida. Explores the three classes of annelids: Class Polychaeta (feeding, locomotion, and larval stages), Class Oligochaeta (lifestyles, feeding adaptations, and anatomy of freshwater oligochaetes and earthworms), and Class Hirudinea (leeches, crayfish, and worms show adaptations for commensal, parasitic, and scavenger lifestyles). DNA evidence places annelids close to the molluscs on the tree of life.
Non-native plants in homeowner's yards endanger wildlife, and experts recommend planting more than 70 percent native plants so plants, insects, and birds can thrive. Additionally, researchers are tracking the spread of neurodegenerative diseases in brains. Other segments include fracking wastewater accumulation found in freshwater mussels' shells and a new protein sequencing method used in biological research. Part of the "4 Awesome Discoveries You Probably Didn't Hear About This Week" series.
As shown on the History Channel. Africa's Sahara Desert is the size of the United States, making it the largest desert in the world. It's also the hottest place on the planet. But now the series of geological discoveries has revealed this searing wasteland hides a dramatically different past. Scientists have unearthed the fossils of whales, freshwater shells, and even ancient human settlements. All clues to a story that would alter the course of human evolution and culminate in biggest climate change event of the last 10,000 years.
The species of Goby fish, Sicyopterus stimpsoni, also known as the inching climber, thrives in the waters off Hawaii. To reach the safe haven of its freshwater spawning area, this Goby must scale a waterfall, or at least the rock behind it, using suction cups on its body. With support from the National Science Foundation, scientists at St. Cloud and Clemson Universities study these extraordinary fish to better understand how they’ve adapted and evolved in order to achieve such vertical feats. Part of the National Science Foundation Series “Science Nation.”
The Magic School Bus is an award winning animated children’s television series based on the book series of the same title by Joanna Cole and Bruce Degen. It is notable for its use of celebrity talent and being both highly entertaining and educational. Ralphie wants to catch salmon to serve at the annual school picnic, but he can't find any at his favorite fishing spot. Where could all the salmon have gone? The kids are soon "Frizzled" inside a salmon bus that has an uncontrollable urge to head upriver. Using its sense of taste and smell, it swims the long journey to a shallow freshwater stream mile away. Why has the bus, which thinks it's a salmon, gone to all this trouble?
