Read more 5. No bodies of water compare to the Great Lakes. Read more 2.
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- The biology of lakes and ponds - Lund University;
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A masterpiec Read more 1. More than a century and a half have passed since Walden was first published, and the world is now a very different place. Lakes are changing rapidly, not because we are separate from nature but because we are so much a part of it.
The biology of lakes and ponds - Kilham - - Limnology and Oceanography - Wiley Online Library
While many of our effects on the natural world today are new, from climate change The book explores both the geology of the lake and the measure of a person — a woman, married, mother of two sons who joined her for portions of the walk. But most of the walk was done solo, an adventure in discovery of self and place.
Florida's Wetlands by Ellie Whitney and 2 more series Florida's Natural Ecosystems and Native Species 2 Taken from the earlier book Priceless Florida and modified for a stand-alone book , this volume discusses Florida's wetlands, including interior wetlands, seepage wetlands, marshes, flowing-water swamps, beaches and marine marshes, and mangrove swamps.
Introduces readers to the trees and plants, insects, mammals, reptiles, and other species that live in Florida's unique wetlands ecosystem, They comprise the world's largest freshwater system, containing 95 percent of the continent's fresh water, and one-fifth of the planet's total supply. The Great Lakes drainage basin is home to 40 million people and is the hub of industry and agriculture in North America. Its rich mineral deposits and natural resources have attracted and Walden by Henry David Thoreau Walden emphasizes the importance of solitude, contemplation, and closeness to nature in transcending the "desperate" existence that, he argues, is the lot of most people.
The book is not a traditional autobiography, but combines autobiography with a social critique of contemporary Western culture's consumerist and materialist attitudes and its distance from and destruction of nature.
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Lakes and Ponds
Sign up. Publications Pages Publications Pages. Search my Subject Specializations: Select Users without a subscription are not able to see the full content. Hence, ponds often have many different animal species using the wide array of food sources. They, therefore, provide an important source of biological diversity in landscapes. Vernal ponds are ponds which dry up for part of the year. Naturally occurring vernal ponds do not usually have fish. They are called vernal ponds because they are typically at their peak depth in the spring the meaning of "vernal" has to do with the spring.
The absence of fish is a very important characteristic since it provides amphibians with breeding locations free from predation by fish. Hence, introducing fish to a pond can have seriously detrimental consequences. In some parts of the world, such as California, the vernal ponds have rare and endangered plant species. On the coastal plain, they provide habitat for endangered frogs such as the Mississippi Gopher Frog.
Ponds, being small, are easily disrupted by human activity, such as hikers. Drainage of ponds is a frequent problem in agricultural areas, such as in the prairie potholes of North America.
Christer Brönmark and Lars-Anders Hansson
Although ponds are a useful source of water for cattle, overgrazing and wading can turn a pond into a muddy hole. Nutrient sources such as fertilized pastures, human sewage, and even lawn fertilizer can cause explosive growth of algae and the loss of rooted plants and many other aquatic species. Roads near ponds can kill large numbers of amphibians and turtles that may migrate to and from the pond as part of their annual breeding cycle.
Many well-intentioned people introduce fish to ponds, being unaware that some species may eat aquatic plants, stir up sediment, and eat the young of amphibians and many other invertebrate species. The gentle slope of land into ponds also provides an expanse of habitat for wetland plants and wet meadows.
The construction of retaining walls, or lawns, can severely degrade the life in a pond. In landscapes where ponds are artificially constructed, they are done so to provide wildlife viewing opportunities, to treat wastewater, or for aesthetic purposes, such as part of a golf course.
The design of a pond determines how productive it will be for wildlife. In general, gently sloping shorelines with broad expanses of wetland plants not only provide the best conditions for wildlife, but they help protect water quality from sources in the surrounding landscapes. It is also beneficial to allow water levels to fall each year during drier periods.
Roads and houses should be kept as far away as possible. Another important way to add ponds back into landscapes is to restore rivers so that they can flood and meander to create large numbers of natural ponds, including vernal pools and wetlands, in river valleys. In origin, a pond is a variant form of the word pound, meaning a confining enclosure. In earlier times, ponds were artificial and utilitarian; as stew ponds , mill ponds and so on. The significance of this feature seems, in some cases, to have been lost when the word was carried abroad with emigrants.
In the United States, natural pools are often called ponds. Ponds for a specific purpose keep the adjective, such as "stock pond", used for watering livestock.
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Pond usually implies a quite small body of water, generally smaller than one would require a boat to cross. Another definition is that a pond is a body of water where even its deepest areas are reached by sunlight or where a human can walk across the entire body of water without being submerged. In some dialects of English, pond normally refers to small artificially created bodies of water. Some regions of the United States define a pond as a body of water with a surface area of less than 10 acres 4. Minnesota , known as the 'land of 10, lakes' is commonly said to distinguish lakes from ponds, bogs and other water features by this definition,  but also says that a lake is distinguished primarily by wave action reaching the shore.
The term is also used for temporary accumulation of water from surface runoff ponded water. There are various regional names for naturally occurring ponds. In Scotland, one of the terms is lochan , which may also apply to a large body of water such as a lake. In North American prairies, they may be termed playas. Ponds are used for the provision of fish and other wildlife including waterfowl, which is a source of food for humans. Pollutants entering ponds are often substantially mitigated by the natural sedimentation and biological activities within the water body.