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Books > Earth & environment > The environment > Conservation of the environment > Conservation of wildlife & habitats > General

An Introduction to Primate Conservation (Hardcover): Serge A. Wich, Andrew Marshall An Introduction to Primate Conservation (Hardcover)
Serge A. Wich, Andrew Marshall
R4,357 Discovery Miles 43 570 Ships in 10 - 15 working days

The number of primates on the brink of extinction continues to grow, and the need to respond with effective conservation measures has never been greater. This book provides a comprehensive and state-of-the-art synthesis of research principles and applied management practices for primate conservation. It begins with a consideration of the biological, intellectual, economic, and ecological importance of primates and a summary of the threats that they face, before going on to consider these threats in more detail with chapters on habitat change, trade, hunting, infectious diseases, and climate change. Potential solutions in the form of management practice are examined in detail, including chapters on conservation genetics, protected areas, and translocation. An Introduction to Primate Conservation brings together an international team of specialists with wide-ranging expertise across primate taxa. This is an essential textbook for advanced undergraduates, graduate students, and established researchers in the fields of primate ecology and conservation biology. It will also be a valuable reference for conservation practitioners, land managers, and professional primatologists worldwide.

Avian Invasions - The Ecology and Evolution of Exotic Birds (Hardcover): Tim M. Blackburn, Julie L. Lockwood, Phillip Cassey Avian Invasions - The Ecology and Evolution of Exotic Birds (Hardcover)
Tim M. Blackburn, Julie L. Lockwood, Phillip Cassey
R2,405 Discovery Miles 24 050 Ships in 10 - 15 working days

Biological invaders represent one of the primary threats to the maintenance of global biodiversity, human health, and the success of human economic enterprises. The continuing globalization of our society ensures that the need to understand the process of biological invasion will only increase in the future. There is also a growing recognition that the study of biological invaders provides a unique insight into basic questions in ecology and evolution.
The study of exotic birds has had a particularly long history and has come to represent a fascinating intersection between the study of biological invasions, avian conservation biology, and basic principles of ecology and evolution. Avian Invasions summarizes and synthesizes this unique historical record and unravels the insights that the study of exotic birds brings to all three of these research strands. It includes chapters on the well-known contributions of exotic bird study to ecological science, and on the post-establishment evolution of introduced bird populations. The result is the most comprehensive picture yet of the invasion process.
Avian Invasions is aimed at professional avian biologists and ornithologists as well as graduate students of avian ecology, evolution and conservation. It also appeals to a more general audience of invasion ecologists.

The Nature of German Imperialism - Conservation and the Politics of Wildlife in Colonial East Africa (Hardcover): Bernhard... The Nature of German Imperialism - Conservation and the Politics of Wildlife in Colonial East Africa (Hardcover)
Bernhard Gissibl
R3,404 Discovery Miles 34 040 Ships in 12 - 19 working days

Today, the East African state of Tanzania is renowned for wildlife preserves such as the Serengeti National Park, the Ngorongoro Conservation Area, and the Selous Game Reserve. Yet few know that most of these initiatives emerged from decades of German colonial rule. This book gives the first full account of Tanzanian wildlife conservation up until World War I, focusing upon elephant hunting and the ivory trade as vital factors in a shift from exploitation to preservation that increasingly excluded indigenous Africans. Analyzing the formative interactions between colonial governance and the natural world, The Nature of German Imperialism situates East African wildlife policies within the global emergence of conservationist sensibilities around 1900.

Adaptive Management of Social-Ecological Systems (Hardcover, 2015 ed.): Craig R. Allen, Ahjond S. Garmestani Adaptive Management of Social-Ecological Systems (Hardcover, 2015 ed.)
Craig R. Allen, Ahjond S. Garmestani
R3,847 Discovery Miles 38 470 Ships in 10 - 15 working days

Adaptive management is an approach to managing social-ecological systems that fosters learning about the systems being managed and remains at the forefront of environmental management nearly 40 years after its original conception. Adaptive management persists because it allows action despite uncertainty, and uncertainty is reduced when learning occurs during the management process. Often termed "learning by doing", the allure of this management approach has entrenched the concept widely in agency direction and statutory mandates across the globe. This exceptional volume is a collection of essays on the past, present and future of adaptive management written by prominent authors with long experience in developing, implementing, and assessing adaptive management. Moving forward, the book provides policymakers, managers and scientists a powerful tool for managing for resilience in the face of uncertainty.

Wildlife and the Public Interest - Nonprofit Organizations and Federal Wildlife Policy (Hardcover): James A. Tober Wildlife and the Public Interest - Nonprofit Organizations and Federal Wildlife Policy (Hardcover)
James A. Tober
R2,917 Discovery Miles 29 170 Ships in 10 - 15 working days

Tober considers the activities of nonprofit organizations that attempt to influence public policy dealing with wildlife. The author favors those organizations interested in preserving such wildlife, rather than those that foster hunting or that assess the value of wildlife in the context of economic development. Tober provides sketches of the makeup of the various organizations covered, the constituents they serve, their budgets, and the means they use to influence public policy. The author focuses particularly on the late 1970s and the 1980s, and uses the controversies over preserving the California condor and the bobcat as case studies. "Choice"

Our relationship with the millions of other species with which we share this earth is institutionalized by many organizations, some of which seek to influence policy in the wildlife arena. Wildlife and the Public Interest is a study of this complex wildlife industry, examining the structure, conduct, and performance of those involved. It studies the extreme complexity of the policy process with regard to the relationship between humans and wildlife. A special focus in this book is on the role of nonprofit organizations that have come to dominate large segments of the industry. Students and scholars of public policy, or environmental and resource policy, as well as the general reader interested in this important topic, will find Wildlife and the Public Interest an invaluable resource.

The book begins with a characterization of current wildlife policy. Further chapters discuss the wildlife industry; What is wildlife? How do we interact with it? What sort of organizations exist in the interest of wildlife? Two current case studies--of the evolution of the controversial captive breeding program for the California Condor and of the regulation of harvest and export of the bobcat--explore the complexities of policy making and the range of nonprofit activity. Finally, the book examines the community of nonprofit organizations in an interorganizational setting.

Current and Future Reproductive Technologies and World Food Production (Hardcover, 2014 ed.): G. Cliff Lamb, Nicolas DiLorenzo Current and Future Reproductive Technologies and World Food Production (Hardcover, 2014 ed.)
G. Cliff Lamb, Nicolas DiLorenzo
R5,536 R5,180 Discovery Miles 51 800 Save R356 (6%) Ships in 12 - 19 working days

This book addresses the impacts of current and future reproductive technologies on our world food production and provides a significant contribution to the importance of research in the area of reproductive physiology that has never been compiled before. It would provide a unique opportunity to separate the impacts of how reproductive technologies have affected different species and their contributions to food production. Lastly, no publication has been compiled that demonstrates the relationship between developments in reproductive management tools and food production that may be used a reference for scientists in addressing future research areas. During the past 50 years assisted reproductive technologies have been developed and refined to increase the number and quality of offspring from genetically superior farm animal livestock species. Artificial insemination (AI), estrous synchronization and fixed-time AI, semen and embryo cryopreservation, multiple ovulation and embryo transfer (MOET), in vitro fertilization, sex determination of sperm or embryos, and nuclear transfer are technologies that are used to enhance the production efficiency of livestock species.

Wildlife Management - Concept, Analysis and Conservation (Hardcover): Amita Saxena Wildlife Management - Concept, Analysis and Conservation (Hardcover)
Amita Saxena
R1,657 Discovery Miles 16 570 Ships in 12 - 19 working days
Human - Wildlife Conflicts in Europe - Fisheries and Fish-eating Vertebrates as a Model Case (Hardcover, 2012): Reinhard A.... Human - Wildlife Conflicts in Europe - Fisheries and Fish-eating Vertebrates as a Model Case (Hardcover, 2012)
Reinhard A. Klenke, Irene Ring, Andreas Kranz, Niels Jepsen, Felix Rauschmayer, …
R5,509 Discovery Miles 55 090 Ships in 12 - 19 working days

This book is about conflicts between different stakeholder groups triggered by protected species that compete with humans for natural resources. It presents key ecological features of typical conflict species and mitigation strategies including technical mitigation and the design of participatory decision strategies involving relevant stakeholders. The book provides a European perspective, but also develops a global framework for the development of action plans.

How To Camp Out (Legacy Edition) - The Original Classic Handbook On Camping, Bushcraft, And Outdoors Recreation (Hardcover,... How To Camp Out (Legacy Edition) - The Original Classic Handbook On Camping, Bushcraft, And Outdoors Recreation (Hardcover, Legacy ed.)
John M Gould
R829 Discovery Miles 8 290 Ships in 10 - 15 working days
Adventures In The Wilderness (Legacy Edition) - The Classic First Book On American Camp Life And Recreational Travel In The... Adventures In The Wilderness (Legacy Edition) - The Classic First Book On American Camp Life And Recreational Travel In The Adirondacks (Hardcover, Legacy ed.)
William H.H. Murray
R879 Discovery Miles 8 790 Ships in 10 - 15 working days
Into the Great Emptiness - Peril and Survival on the Greenland Ice Cap (Hardcover): David Roberts Into the Great Emptiness - Peril and Survival on the Greenland Ice Cap (Hardcover)
David Roberts
R860 R755 Discovery Miles 7 550 Save R105 (12%) Ships in 12 - 19 working days

By 1930, no place in the world was less well explored than Greenland. The native Inuit had occupied the relatively accessible west coast for centuries. The east coast, however, was another story. In August 1930, Henry George Watkins (nicknamed Gino), a 23-year-old explorer, led thirteen scientists and explorers on an ambitious journey to the east coast of Greenland and its vast and forbidding interior. Their mission: chart and survey the region and establish a permanent meteorological base 8,000 feet high on the ice cap. That plan turned into an epic survival ordeal when August Courtauld, manning the station solo through the winter, became entombed by drifting snow. David Roberts, "veteran mountain climber and chronicler of adventures" (Washington Post), draws on firsthand accounts and rich archival materials to tell the story of this daring expedition and of the ingenious young explorer at its helm.

Antarctic Futures - Human Engagement with the Antarctic Environment (Hardcover, 2014 ed.): Tina Tin, Daniela Liggett, Patrick T... Antarctic Futures - Human Engagement with the Antarctic Environment (Hardcover, 2014 ed.)
Tina Tin, Daniela Liggett, Patrick T Maher, Machiel Lamers
R4,708 R3,832 Discovery Miles 38 320 Save R876 (19%) Ships in 12 - 19 working days

At the beginning of the 21st century, Antarctica is poised at the edge of a warmer and busier world. Leading Antarctic researchers examine the needs and challenges of Antarctic environmental management today and tomorrow. Through: (i) investigating the impacts of human activities on specific ecosystems and species, (ii) examining existing environmental management and monitoring practices in place in various regions and (iii) interrogating stakeholders, they address the following questions: What future will Business-As-Usual bring to the Antarctic environment? Will a Business-As-Usual future be compatible with the objectives set out under the Antarctic Treaty, especially its Protocol on Environmental Protection? What actions are necessary to bring about alternative futures for the next 50 years? This volume is an outcome of the International Polar Year (2007-2009) Oslo Science Conference (8-12, June, 2010).

Advances in Marine and Brackishwater Aquaculture (Hardcover, 2015 ed.): Santhanam Perumal, Thirunavukkarasu A R, Perumal... Advances in Marine and Brackishwater Aquaculture (Hardcover, 2015 ed.)
Santhanam Perumal, Thirunavukkarasu A R, Perumal Pachiappan
R5,213 Discovery Miles 52 130 Ships in 12 - 19 working days

This book compiles the latest findings in the field of marine and brackishwater aquaculture. It covers significant topics such as techniques of culture of live feeds (microalgae, rotifer, Artemia, marine copepod & polychaetes), while also highlighting vital themes like the culture and applications of free and marine sponge associated microbial probiotics, controlled breeding, seed production and culture of commercially important fin and shell fishes. Moreover, the book focuses on the breeding and culture of marine ornamental fishes, sea cucumber and sea urchin and discusses seaweeds culture, aqua feed formulation and nutrition, water quality management in hatchery and grow-out culture systems, fish disease diagnosis and health management and cryopreservation of fish gametes for sustainable aquaculture practices, all from a multidimensional perspective. The global fish production was 154 million tonnes in 2011 which more or less consisted of capture and culture fisheries (FAO, 2012). Roughly 80% of this is from inland-freshwater aquaculture and the remainder from capture fisheries in the marine and brackishwater sector. However, marine and brackishwater catches have recently begun to diminish due to overexploitation, climate change and pollution. The UNEP report affirmed that if the world remains on its current course of overfishing, by 2050, the ocean fish stock could become extinct or no longer commercially viable to exploit. In these circumstances, aquaculture is considered to be a promising sector to fulfill our future protein requirement. However, brackishwater and marine fish production now face serious challenges due to e.g. lack of quality fish seeds, feeds, poor water quality management and diseases. Fisheries and aquaculture sectors play a vital role as potential sources of nutritional security and food safety around the globe. Fish food is rich in protein, vitamins, phosphorous, calcium, zinc, selenium etc. In addition, fish contains omega-3 fatty acids, which help to prevent cardiovascular diseases. Fish food can also provide several health benefits to consumers. The omega 3 fatty acids found in fish can reduce the levels of LDL cholesterol (the "bad" cholesterol) and increase the HDL levels (the "good" cholesterol). Research conducted in Australia has proved that fish consumption can be used to cure hypertension and obesity. It is also reported that people who ate more fish were less prone to asthma and were able to breathe more easily. Omega 3 fish oil or fish consumption can help to prevent three of the most common forms of cancer: breast cancer, colon and prostate cancer. The omega 3 fatty acids present in fish or fish oil induce faster hair growth and prevent hair loss. Since most varieties of fish are rich in protein, eating fish helps to keep hair healthy. Furthermore, fish or fish oil helps in improving the condition of dry skin, giving it a healthy glow. It is useful in treating various skin problems such as eczema, psoriasis, itching, redness of skin, skin lesions and rashes. It is well known that eating fish improves vision and prevents Alzheimer's and type-2 diabetes, and can combat arthritis. Further, fish oil or fish is good for pregnant women, as the DHA present in it helps in the development of the baby's eyes and brain. It helps to avoid premature births, low birth weights and miscarriages. In addition, it is widely known that fish can be a good substitute for pulses in cereal-based diets for the poor. The global fish production was roughly 154 million tonnes in 2011 (FAO, 2012). It is estimated that by 2020 global fish requirements will be over 200 million tonnes; as such, innovative technological improvements are called for in order to improve the production and productivity in fisheries. In this context, this book provides valuable information for academics, scientists, researchers, government officials and farmers on innovative technological advances for sustainable fish production using aquaculture methods. The book identifies the main issues and trends in marine and brackishwater aquaculture from a global perspective in general and in the Indian context in particular. It includes 23 chapters written by prominent researchers from various institutes and universities across India, who address the latest aquaculture technologies with distinctive approaches to support academics, researchers and graduates in the fields of Fisheries, Aquaculture, Marine Science, Marine Biology, Marine Biotechnology, Zoology and Agricultural Sciences. Our thanks go to our contributors; we are confident that all readers will immensely benefit from their valued expertise in the field of marine and brackishwater aquaculture.

Catch and Release - The Enduring Yet Vulnerable Horseshoe Crab (Hardcover): Lisa Jean Moore Catch and Release - The Enduring Yet Vulnerable Horseshoe Crab (Hardcover)
Lisa Jean Moore
R2,994 Discovery Miles 29 940 Ships in 10 - 15 working days

The unexpected and fascinating interspecies relationship between humans and horseshoe crabs. Horseshoe crabs are considered both a prehistoric and indicator species. They have not changed in tens of millions of years and provide useful data to scientists who monitor the health of the environment. From the pharmaceutical industry to paleontologists to the fishing industry, the horseshoe crab has made vast, but largely unknown, contributions to human life and our shared ecosystem. Catch and Release examines how these intersections steer the trajectory of both species' lives, and futures. Based on interviews with conservationists, field biologists, ecologists, and paleontologists over three years of fieldwork on urban beaches, noted ethnographer Lisa Jean Moore shows how humans literally harvest the life out of the horseshoe crabs. We use them as markers for understanding geologic time, collect them for agricultural fertilizer, and eat them as delicacies, capture them as bait, then rescue them for conservation, and categorize them as endangered. The book details the biomedical bleeding of crabs; how they are caught, drained of 40% of their blood, and then released back into their habitat. The model of catch and release is essential. Horseshoe crabs cannot be bred in captivity and can only survive in their own ecosystems. Moore shows how horseshoe crabs are used as an exploitable resource, and are now considered a "vulnerable" species. An investigation of how humans approach animals that are essential for their survival, Catch and Release questions whether humans should have divine, moral, or ethical claims to any living being in their path.

Spatial Dynamics and Ecology of Large Ungulate Populations in Tropical Forests of India (Hardcover, 1st ed. 2021): N. Samba... Spatial Dynamics and Ecology of Large Ungulate Populations in Tropical Forests of India (Hardcover, 1st ed. 2021)
N. Samba Kumar, K. Ullas Karanth, James D. Nichols, Srinivas Vaidyanathan, Beth Gardner, …
R3,031 Discovery Miles 30 310 Ships in 10 - 15 working days

Large ungulates in tropical forests are among the most threatened taxa of mammals. Excessive hunting, degradation of and encroachments on their natural habitats by humans have contributed to drastic reductions in wild ungulate populations in recent decades. As such, reliable assessments of ungulate-habitat relationships and the spatial dynamics of their populations are urgently needed to provide a scientific basis for conservation efforts. However, such rigorous assessments are methodologically complex and logistically difficult, and consequently many commonly used ungulate population survey methods do not address key problems. As a result of such deficiencies, key parameters related to population distribution, abundance, habitat ecology and management of tropical forest ungulates remain poorly understood. This book addresses this critical knowledge gap by examining how population abundance patterns in five threatened species of large ungulates vary across space in the tropical forests of the Nagarahole-Bandipur reserves in southwestern India. It also explains the development and application of an innovative methodology - spatially explicit line transect sampling - based on an advanced hierarchical modelling under the Bayesian inferential framework, which overcomes common methodological deficiencies in current ungulate surveys. The methods and results presented provide valuable reference material for researchers and professionals involved in studying and managing wild ungulate populations around the globe.

The Bird Book - A curious compendium of 50 wild birds (Paperback): Meriel Lland, Roxanne Furman The Bird Book - A curious compendium of 50 wild birds (Paperback)
Meriel Lland, Roxanne Furman; Illustrated by Nicola Howell Hawley
R265 R233 Discovery Miles 2 330 Save R32 (12%) Ships in 12 - 19 working days

An inspiring introduction to 50 wild birds for mindful post-Covid nature watchers. Written by vegan wildlife presenter and filmmaker Roxy Furman, and nature writer, poet and film-artist Dr Meriel Lland, this pocket companion for the newbie birdwatcher will introduce you to 50 birds often seen in the UK and Europe. Birding is one of the biggest trends of the last few years, and whether you live in a high-rise flat or a cabin in the woods, spending time in nature - away from screens - has proven benefits for our wellbeing. Each illustrated bird comes with a map of where in Europe you're likely to spot it, facts you never knew about each species, and notes on how we can help birds thrive - particularly those under threat. Whether you spot birds on your commute, cycle rides or weekend adventures, this is the perfect book for mindful nature lovers who want to look after our planet.

Rethinking Fisheries Governance - The Role of States and Meta-Governance (Hardcover, 1st ed. 2018): Hoang Viet Thang Rethinking Fisheries Governance - The Role of States and Meta-Governance (Hardcover, 1st ed. 2018)
Hoang Viet Thang
R3,551 Discovery Miles 35 510 Ships in 12 - 19 working days

This book explores how the state can foster collective action by fisher's communities in fisheries management. It presents a different perspective from Elinor Ostrom's classic work on the eight institutional conditions that foster collective action in natural resource management and instead emphasizes the role of the state in fisheries co-management, engaging a state-centric notion of 'meta-governance'. It argues that first, the state is required to foster collective action by fishers; and secondly, that the current fisheries co-management arrangements are state-centric. The study develops these arguments through the analysis of three case studies in Japan, Vietnam and Norway. The author also makes a theoretical contribution to governance literature by developing Ostrom's 'society-centric' framework in a way which makes it more amenable to the analysis of state capacity and government intervention in a comparative context. This book will appeal to students and scholars of global governance, fisheries management, co-management, and crisis management, as well as practitioners of fisheries management.

Fish Protection Technologies and Fish Ways for Downstream Migration (Hardcover, 1st ed. 2020): Ulrich Schwevers, Beate Adam Fish Protection Technologies and Fish Ways for Downstream Migration (Hardcover, 1st ed. 2020)
Ulrich Schwevers, Beate Adam
R3,570 Discovery Miles 35 700 Ships in 10 - 15 working days

This book offers a comprehensive review of current systems for fish protection and downstream migration. It offers the first systematic description of the currently available technologies for fish protection at hydropower intakes, including accurate and timely data collected by the authors and other researchers. It describes how to design and test them in agreement with the guidelines established from the EU Water Framework Directive. The book includes important information about fish biology, with a special focus on swimming and migration mechanisms. It offers a robust bridge between concepts in applied ecology and civil hydraulic engineering, thus providing biologists and hydraulic engineers with an authoritative reference guide to both the theory and practice of fish protection. It is also of interest for planners, public authorities as well as environmental consultants

Froggit Froggins (Paperback): Davis Froggit Froggins (Paperback)
Davis
R528 Discovery Miles 5 280 Ships in 12 - 19 working days
Birds of Prey - Biology and conservation in the XXI century (Hardcover, 1st ed. 2018): Jose Hernan Sarasola, Juan Manuel... Birds of Prey - Biology and conservation in the XXI century (Hardcover, 1st ed. 2018)
Jose Hernan Sarasola, Juan Manuel Grande, Juan Jose Negro
R7,702 Discovery Miles 77 020 Ships in 12 - 19 working days

This book will provide the state-of-the-art on most of the topics involved in the ecology and conservation of birds of prey. With chapters authored by the most recognized and prestigious researchers on each of the fields, this book will become an authorized reference volume for raptor biologists and researchers around the world.

Understanding Animal Welfare - An Integrated Approach (Hardcover, 2012 ed.): Edward N. Eadie Understanding Animal Welfare - An Integrated Approach (Hardcover, 2012 ed.)
Edward N. Eadie
R4,661 Discovery Miles 46 610 Ships in 12 - 19 working days

This book examines the contents, influence, and potential of a personal selection of modern books published over the last fifty years that have been relevant to improving welfare. The works selected comprise three earlier classics that mainly deal with animal experimentation and intensive farming, as well as five that concentrate on specific subject areas, namely history, science, applied ethics, politics and law, that are important to protecting the welfare of animals against suffering inflicted by humans. The books are arranged in the order of their publication date, and for each one a few related works are also mentioned or discussed. This collection provides a broad understanding of animal protection issues, and provides the necessary basis for an informed and comprehensive approach to improving the welfare of animals. The books selected have been influential and they have the potential to improve animal welfare in the future.

Spawning Migration of the European Eel - Reproduction index, a useful tool for conservation management (Hardcover, 2009 ed.):... Spawning Migration of the European Eel - Reproduction index, a useful tool for conservation management (Hardcover, 2009 ed.)
Guido Van Den Thillart, Sylvie Dufour, J. Cliff Rankin
R5,977 Discovery Miles 59 770 Ships in 10 - 15 working days

Freshwater eels are almost infinitely improbable creatures. They spawn and die in the middle of the ocean, often associated with undersea mountains. Their tra- parent, leaf-like larvae move with ocean currents for months or years until they approach the mouths of freshwater rivers. Then they undergo a dramatic transf- mation in morphology, physiology and behavior. They move from their planktonic oceanic environment, migrate upstream and live for several years as apex fre- water predators. Then, almost impossibly, as they become sexually mature, they reverse their migration downstream to the ocean and back to spawning grounds to complete their life cycle. The dramatic changes in their life cycles are incredible. The efforts to unravel the details of their life history have been truly daunting. Much of the past research was the work of dedicated individuals who devoted their lifetime research to these fishes. Freshwater eels merit a separate chapter in almost any textbook dealing with ichthyology, marine biology or animal migration. We know a great deal about some aspects of the biology of freshwater eels. However, our understanding of their bi- ogy still resembles a work of art as much as a work of science. To some it appears like the sweeping brush strokes of a Japanese Zen landscape, to others it resembles the work of a French impressionist, and to still others it appears as magic realism.

Reef Fish Spawning Aggregations: Biology, Research and Management (Hardcover, 2012): Yvonne Sadovy De Mitcheson, Patrick L.... Reef Fish Spawning Aggregations: Biology, Research and Management (Hardcover, 2012)
Yvonne Sadovy De Mitcheson, Patrick L. Colin
R6,005 Discovery Miles 60 050 Ships in 10 - 15 working days

Reef fish spawning aggregations, ranging from small groups to many tens of thousands of individuals, are spectacular but poorly known natural phenomena whereby fish assemble at specific times and locations to spawn. For some species these large groups may be the only form of reproduction, the high fish numbers briefly giving a false impression of stability and abundance-an 'illusion of plenty'. They are often a focus for intensive seasonal fishing because of their predictability and because many important commercial fishes form them. Highly vulnerable to overexploitation, many aggregations and their associated fisheries, have disappeared or are in decline. Few are effectively managed or incorporated into protected areas. Aggregations are not well understood by fishery scientists, managers and conservationists and their significance little appreciated by fishers or the wider public. To ensure their persistence to replenish important fisheries in coral ecosystems, maintain their ecosystem function and continue to delight divers, a significant change in perspective is needed to foster protection and management. This book provides comprehensive and practical coverage of the biology, study and management of reef fish aggregations, exploring their how, when, where, and why. It explores ways to better protect, study, manage and conserve them, while identifying key data gaps and questions. The text is extensively illustrated with many unique, never before published, photographs and graphics. Case studies on over 20 interesting and important fishes are included, outlining their biology and fisheries and highlighting major concerns and challenges.

Fisheries Resources Economics (Hardcover, 1st ed. 2021): Xinjun Chen Fisheries Resources Economics (Hardcover, 1st ed. 2021)
Xinjun Chen
R5,046 Discovery Miles 50 460 Ships in 12 - 19 working days

Fisheries resources are an important component of natural resources. It is an important source of high-quality animal protein and food for humans, which provides employment, economic benefits and social welfare for people engaged in fishing activities. It also has played an important role in food safety, economic development, and foreign trade. Fisheries resources economics is an important branch of both applied economics and resource economics. Its research object is fishery resources and its economic problems. The economics of fishery resources is to focus on the relationship between the demand for human economic activities and the supply of fishery resources, as well as between fishery resources and its development. This book expounds the reasons for the economic problems of fishery resources and the theoretical principles for solving them, so as to reveal the objective rules of the allocation of fishery resources in different regions and at different times, to coordinate the relationship between the utilization of fishery resources and economic development, and to realize the sustainable development of fishery economy. This book will also provide learning materials for undergraduates, graduate students and practitioners engaged in fishery resources development and scientific management.

Ecological Effects of Water-level Fluctuations in Lakes (Hardcover, 2008 ed.): Karl M. Wantzen, Karl-Otto Rothhaupt, Martin... Ecological Effects of Water-level Fluctuations in Lakes (Hardcover, 2008 ed.)
Karl M. Wantzen, Karl-Otto Rothhaupt, Martin Moertl, Marco Cantonati, Laszlo G.-Toth, …
R6,040 Discovery Miles 60 400 Ships in 10 - 15 working days

Most aquatic ecosystems have variable water levels. These water-level fluctuations (WLF) have multiple effects on the organisms above and below the waterline. Natural WLF patterns in lakes guarantee both productivity and biodiversity, while untimely floods and droughts may have negative effects. Human impacts on WLF have led to a stabilization of the water levels of many lakes by hydraulic regulation, untimely drawdown due to water use, or floods due to water release from hydropower plants in the catchments.

This book provides a first review in this field. It presents selected papers on the ecological effects of WLF in lakes, resulting from a workshop at the University of Konstanz in winter 2005. Issues addressed here include the extent of WLF, and analyses of their effects on different groups of biota from microorganisms to vertebrates. Applied issues include recommendations for the hydrological management of regulated lakes to reduce negative impacts, and a conceptual framework is delivered by an extension of the floodpulse concept for lakes. Current impacts on water use, including increasing demands on drinking and irrigation water, hydropower etc., and climate change effects on WLF make this book an essential resource for aquatic ecologists, engineers, and decision-makers dealing with the management of lake ecosystems and their catchments.

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