Pearly mussels (Unionoidea) live in lakes, rivers, and streams around the world. These bivalves play important roles in freshwater ecosystems and were once both culturally and economically valuable as sources of food, pearls, and mother-of-pearl. Today, however, hundreds of species of these mussels are extinct or endangered. David L. Strayer provides a critical synthesis of the factors that control the distribution and abundance of pearly mussels. Using empirical analyses and models, he assesses the effects of dispersal, habitat quality, availability of fish hosts, adequate food, predators, and parasites. He also addresses conservation issues that apply to other inhabitants of fresh waters around the globe and other pressing issues in contemporary ecology.
species offreshwater fish in Pennsylvania. Whether redbreast sunfish in the east, ancient lake sturgeon in the west, or any number of colorful sunfishes from ponds and creeks in between, this guide describes any species likely to be caught by hook-and-line.The noted diagnostic characteristics and beautiful color illustrations will prove an indispensable aid for identification. Included are notes on preferred habitat and favorite baits for landing each species. This 12-panel guide conveniently folds up in to a packet narrow enough to fit in a back pocket, glovebox, or tackle box yet sturdy enough to stand up under repeated use durable lamination also makes it waterproof
A futuristic approach in water management has been discussed in this descriptive book. It is estimated that there is nearly 1.4 billion km3 of water in this world but only about 3% (39 million km3) of it is available as fresh water. Furthermore, most of this fresh water is found as ice in the arctic regions, atmospheric water or deep groundwater. Since water is a source of life and is vital for all forms of life across the planet, its sustainable use is an extremely crucial issue. Water Management is the fundamental term employed for elucidating all the activities involved in managing the optimum use of the world's water resources. However, only a small percentage of fresh water available can be subjected to water management. It is still a huge amount, but the distinct characteristic of water is that unlike other resources, it is irreplaceable. This book describes an elementary analysis on several topics related to water management from across the globe. The topics elucidated in this book cover politics, recent models for water resource management of rivers and reservoirs as well as issues associated with agriculture. Growing water demands, water quality problems and water pricing have also been considered. Reputed scientists and experts from across the world have contributed descriptive information in this book. It covers a broad range of current issues, describing the current problems and illustrating the complexity of water management.
"Hi, there! you big Freshman, take off your hat-yes, we're talking to you-take off your hat to the class above you-stop, don't try to get by, my sober-faced young friend. That would not be nice of you." At first the Freshman did not understand that he was the one addressed, and, when he did, his first startled impulse was to hurry by and pretend not to notice them.
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