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The Pearl Book 4 E

Author: Antoinette Leonard Matlins
Publisher: Gemstone Press
ISBN: 9781683364139
Size: 20.31 MB
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For people who want a reliable source of information to guide them in the fascinating and complex world of pearls natural, cultured and imitation."

Wetland Environments

Author: James S. Aber
Publisher: John Wiley & Sons
ISBN: 1118349539
Size: 44.49 MB
Format: PDF, ePub
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Wetlands - swamp, marsh, bayou, tundra and bog - are places thatare rarely visited and often misunderstood but they have, in fact,conspicuous roles in the physical, biological and culturalgeography of the world. They are intrinsically beautifulenvironments where one may see the natural and essential values inthe interaction of water, soil, vegetation, wildlife, andhumans. Wetlands occur at the confluence of uniqueterrestrial, hydrological and climatic conditions that give rise tosome of the most biodiverse regions of the world. They alsoplay vital roles in the cycling and storage of key nutrients,materials and energy through the Earth?s system. A complete study of wetland environments requires the assessmentof their physical and biological attributes, properties andfunctions of these ecosystems, and the economic, political andsocial aspects that mediate their use globally. A systemsapproach is taken throughout this book which emphasizes theinteractions between these elements of wetland ecosystems. Moreover, selected case studies from across the world are used toillustrate wetland characteristics and circumstances. This book is intended to foster a greater awareness andappreciation of wetlands, promote a culture of conservation andwise management, and spread the knowledge that wetlands areimportant, indeed crucial, elements of the globalenvironment. Our attempts to understand, manage and enhancewetlands in the twenty-first century are part of the larger effortto maintain a sustainable Earth. Readership: Introductory or intermediate levelundergraduates taking courses on wetland environments Additional resources for this book can be found at: ahref="http://www.wiley.com/go/aber/wetland"www.wiley.com/go/aber/wetland/a.

Goods And Services Of Marine Bivalves

Author: Aad C. Smaal
Publisher: Springer
ISBN: 3319967762
Size: 27.86 MB
Format: PDF, ePub
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The aim of this open access book is to review and analyse the goods and services of bivalve shellfish. How they are defined, what determines the ecological functions that are the basis for the goods and services, what controversies in the use of goods and services exist, and what is needed for sustainable exploitation of bivalves from the perspective of the various stakeholders. The book is focused on the goods and services, and not on impacts of shellfish aquaculture on the benthic environment, or on threats like biotoxins; neither is it a shellfish culture handbook although it can be used in evaluating shellfish culture. The reviews and analysis are based on case studies that exemplify the concept, and show the strengths and weaknesses of the current applications. The multi-authored reviews cover ecological, economic and social aspects of bivalve goods and services. The book provides new insights for scientists, students, shellfish producers, policy advisors, nature conservationists and decision makers. This book is open access under the CC BY license.

The Pearl Oyster

Author: Paul Southgate
Publisher: Elsevier
ISBN: 9780080931777
Size: 70.61 MB
Format: PDF, ePub
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Contrary to a generally held view that pearls are found by chance in oysters, almost all are now produced from farms. This book is a comprehensive treatment of all aspects of the biology of pearl oysters, their anatomy, reproduction, genetics, diseases, etc. It considers how they are farmed from spawning and culturing larvae in hatcheries to adults in the ocean; how various environmental factors, including pollution affect them; and how modern techniques are successfully producing large numbers of cultured pearls. This is the ultimate reference source on pearl oysters and the culture of pearls, written and edited by a number of scientists who are world experts in their fields. •Comprehensive treatment of pearl oyster biology and pearl culture •Written by the top world authorities •Highly illustrated and figured •Of practical relevance to a broad readership, from professional biologists to those involved in the practicalities and practice of pearl production

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