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Books > Professional & Technical > Agriculture & farming > Aquaculture & fishing: practice & techniques

Biology and Ecology of Toxic Pufferfish - Biology and Ecology of Marine Life (Paperback): Ramasamy Santhanam Biology and Ecology of Toxic Pufferfish - Biology and Ecology of Marine Life (Paperback)
Ramasamy Santhanam
R2,472 Discovery Miles 24 720 Ships in 18 - 22 working days

This is the first comprehensive book on the biology and ecology of pufferfish, also known as blowfish, swellfish, and globefish. Covering 197 species of pufferfish recorded so far from the marine, brackish, and freshwater ecosystems of the world, this important volume expounds on the toxins and associated poisonings of pufferfish. Importantly, the volume also explores the many uses of pufferfish, such as in aquariums, for their nutritional and culinary value, and for their emerging uses in the treatment of pain. Topics covered include: biology and ecology of pufferfish profiles of the world's marine, brackish, and freshwater pufferfish species characteristics of TTX (tetrodotoxin) and STX (saxitoxin) of pufferfish pufferfish poisoning and symptoms: treatment and management aquarium uses of pufferfish nutritional and pharmaceutical values of pufferfish diseases and parasites of pufferfish and their management

Oceanography and Marine Biology: An Annual Review, Volume 59 - An Annual Review, Volume 59 (Hardcover): P. Todd, M. Byrne, E... Oceanography and Marine Biology: An Annual Review, Volume 59 - An Annual Review, Volume 59 (Hardcover)
P. Todd, M. Byrne, E Marzinelli, B Russell, I. Smith, …
R6,835 Discovery Miles 68 350 Ships in 10 - 15 working days

Chapters are authored by leading experts from around the world, including Greece, Chile, Australia, Canada and Australia, while an international Editorial Board ensures continued high quality and rigorous peer review of published articles. The ever increasing interest in work in oceanography and marine biology and its relevance to global environmental issues, especially global climate change and its impacts, creates a demand for authoritative reviews summarizing the results of recent research. This series remains one of the most cited sources in marine science and oceanography.

Phycobiotechnology - Biodiversity and Biotechnology of Algae and Algal Products for Food, Feed, and Fuel (Hardcover): Jeyabalan... Phycobiotechnology - Biodiversity and Biotechnology of Algae and Algal Products for Food, Feed, and Fuel (Hardcover)
Jeyabalan Sangeetha, Devarajan Thangadurai, Saniyasi Elumalai, Shivasharana Chandrabanda Thimmappa
R4,079 Discovery Miles 40 790 Ships in 10 - 15 working days

Named #1 of 15 Best New Biotechnology Books to Read in 2021 by BookAuthority. This volume explores and explains the vast uses and benefits of algae as food, feed, and fuel. It covers the most advanced applications of algae in the food and feed industries and for environmental sustainability. With chapters written by experts and which were extensively reviewed by many well-known subject experts and professionals, Phycobiotechnology: Biodiversity and Biotechnology of Algae and Algal Products for Food, Feed, and Fuel provides an abundance of valuable information. Algae are a genetically diverse group of organisms with a wide range of physiological and biochemical characteristics that have unique capabilities in the fields of agriculture, pharmaceuticals, industry, and environment. Algae hold the potential to become the planet's next major source of energy and a vital part of the solution for climate change and dependence on fossil fuels. Many varieties of algae are also known to be an abundant source of vitamins, minerals, and other nutrients that can boost the human immune system.

Seaweed and Microalgae as Alternative Sources of Protein (Hardcover): Xingen Lei Seaweed and Microalgae as Alternative Sources of Protein (Hardcover)
Xingen Lei; Contributions by Sung-Woo Kim, Gaozhong Shen, Charlotte Jacobsen, Alireza Naseri, …
R4,046 Discovery Miles 40 460 Ships in 18 - 22 working days

"...this book covers a range of algal phyla, specialised algal bioprocessing and application topics that make it very interesting for a broad audience. Each chapter covers a theme in such a way that can easily be read by a non-specialist but, as the authors incorporate recent published papers, the book will also be interesting for experts...I also recommend the book for entrepreneurs and technical staff working in different algal-based operations." (Journal of Phycology) As the global demand for meat increases due to population and economic growth, more pressure has been placed on the animal feed sector to support sustainable livestock production, whilst also ensuring the nutritional value and palatability of feed. With traditional sources of protein, including oilseeds and distiller grains, considered as major contributors to climate change, there is growing interest in establishing alternative, more 'climate-smart' sources of protein, such as seaweed and other forms of microalgae that can supplement livestock diets. Seaweed and microalgae as alternative sources of protein summarises current advances in utilising macroalgae and microalgae as alternative sources of proteins. The collection reviews processes of protein formation in macroalgae and microalgae, macroalgae farming and processing as well as microalgae bioprocessing. Chapters also discuss the practical application of seaweed as an alternative protein source in ruminant, pig, poultry and fish diets. Edited by Professor Xin Gen Lei, Cornell University, USA, Seaweed and microalgae as alternative sources of protein will be a standard reference for researchers from universities or other research centres involved in macroalgae/microalgae production and livestock nutrition, companies involved in the manufacture or supply of animal feed or livestock nutrition services, government and other agencies regulating the animal feed sector, as well as farmers interested in furthering their knowledge on recent developments in the animal feed/livestock nutrition sector.

Biology and Ecology of Edible Marine Bivalve Molluscs (Paperback): Ramasamy Santhanam Biology and Ecology of Edible Marine Bivalve Molluscs (Paperback)
Ramasamy Santhanam
R2,492 Discovery Miles 24 920 Ships in 10 - 15 working days

This comprehensive volume provides a plethora of first-hand information on the diversity, biology, and ecology of edible marine bivalve molluscs. It covers the biology of edible marine bivalves; profiles about 180 species, providing information on their habitat, distribution, morphology, food and feeding, reproduction, conservation status, etc.; discusses their nutritional values; examines their pharmaceutical value; and looks at their diseases and parasites. This abundance of knowledge is presented in an easy-to-read style with informative illustrations. Marine bivalve molluscs play important roles in the marine ecosystems by filtering water and serving as habitat and prey for a variety of sea life. This diverse group of species, estimated at around 9,200, inhabits virtually the entire world's oceans, from the balmy tropics to the sub-zero Arctic, and from deep oceans to sandy and rocky shorelines. Among the marine bivalves, a total of 180 species (including mussels, oysters, scallops, cockles, and clams) have long been a part of the diet of coastal human populations. Many species of marine bivalves are also commercially important for other purposes, such as pearls and shells for jewelry and decoration. The volume, part of the Biology and Ecology of Marine Life book series, will be of great use to students and researchers in fisheries science, marine biology, aquatic biology, and zoology.

Biology and Ecology of Venomous Marine Snails (Paperback): Ramasamy Santhanam Biology and Ecology of Venomous Marine Snails (Paperback)
Ramasamy Santhanam
R2,458 Discovery Miles 24 580 Ships in 18 - 22 working days

The first comprehensive volume exclusively on marine cone snails, this book provides descriptions of over 100 species of hazardous marine snails along with their biological and ecological characteristics; the characteristics of conotoxins; information on cone snail injuries and their treatment along with prevention measures; and the therapeutic and medicinal value of conotoxins, including as a powerful nonaddictive painkiller, an epilepsy drug, and more. Over 275 color illustrations accompany the text for easy identification.

Sustainable Blue Revolution in India - Way Forward (Hardcover): Latha Shenoy, Shridhar Rajpathak Sustainable Blue Revolution in India - Way Forward (Hardcover)
Latha Shenoy, Shridhar Rajpathak
R3,515 Discovery Miles 35 150 Ships in 10 - 15 working days

This book provides comprehensive information on several dimensions of blue revolution in a structured form. Material provided in the book has been gathered from several relevant published sources and views expressed are based on practical field experience of the authors. Blue revolution would be one of the big game changers for the Indian economy. The subject of sustainable development of fisheries sector being very vast, concerted efforts have been made to accommodate all the relevant elements. Very little reading material with proper analysis is currently available and this book is expected to bridge the gap and project way-forward to achieve sustainable development of fisheries and aquaculture in India under the blue revolution. The book is organised under 13 chapters covering wide ranging subjects that include fish production, processing, marketing, exports/imports of fishery products; ecolabelling; role of industry in promoting sustainability in fishing and aquaculture; sustainability issues in marine/inland fisheries/aquaculture; and fisheries regulations and legislations. Information has been provided on Sustainable Development Goals(SDGs) particularly SDG 14 (Life Below Water); components of blue economy; Government of India fisheries development initiatives; and executive summary of recently launched PMMSY. Emerging plant and cell-based seafood segment; overall impacts of climate change; and impact of recent pandemic COVID-19 on fisheries and aquaculture are discussed under separate chapters. Finally, a chapter on 'Way Forward' is included that suggests practical management measures, technology infusion, technical interventions along with few innovative concepts and approaches towards achieving blue revolution. Note: T&F does not sell or distribute the Hardback in India, Pakistan, Nepal, Bhutan, Bangladesh and Sri Lanka.

Ecological and Genetic Implications of Aquaculture Activities (Hardcover, 2007 ed.): Theresa M Bert Ecological and Genetic Implications of Aquaculture Activities (Hardcover, 2007 ed.)
Theresa M Bert
R5,242 Discovery Miles 52 420 Ships in 18 - 22 working days

In this book, numerous prominent aquaculture researchers contribute 27 chapters that provide overviews of aquaculture effects on the environment. They comprise a comprehensive synthesis of many ecological and genetic problems implicated in the practice of aquaculture and of many proven, attempted, or postulated solutions to those problems. This is an outstanding source of reference for all types of aquaculture activities.

Stability and Trim of Fishing Vessels and Other Small Ships 2e (Hardcover, 2nd Edition): J. A. Hind Stability and Trim of Fishing Vessels and Other Small Ships 2e (Hardcover, 2nd Edition)
J. A. Hind
R1,625 Discovery Miles 16 250 Ships in 18 - 22 working days

The loading of vessels to secure maximum security and seakindliness is of vital importance to fishermen. This book deals with this important subject in detail and is intended as a textbook for preparing for masters and mates certficates. It also affords practical guidance to the fisheman or smallboat owner. Since it was first published, much of its advice and many of the principles behind its recommendation have become officially adopted, nationally and internationally.

Terrestrial Environments (Paperback): J.L. Cloudsley-Thompson Terrestrial Environments (Paperback)
J.L. Cloudsley-Thompson
R1,097 Discovery Miles 10 970 Ships in 10 - 15 working days

Originally published in 1975 Terrestrial Environments covers the zoogeography and ecology of the main terrestrial environments of the world, including fresh water habitats with emphasis on their fauna. The book also explores climate and vegetation in so far as they affect animal life. Finally, the selective influence of the environment on its fauna is discussed and, conversely, the influence of regulation, a synthesis of these interrelations. Morphological adaptations of the animals inhabiting various types of terrestrial environments are considered in relation to locomotion, feeding, and escape from enemies. Physiological adaptations are also mentioned briefly, and the adaptative importunate of diurnal and seasonal rhythms is stressed.

Coastal and Deep Ocean Pollution (Paperback): Andres Hugo Arias, Sandra Elizabeth Botte Coastal and Deep Ocean Pollution (Paperback)
Andres Hugo Arias, Sandra Elizabeth Botte
R2,047 Discovery Miles 20 470 Ships in 10 - 15 working days

During the recent decades, social, political and academic endeavours have been made to improve environmental quality and reduce pollution. In particular, the ocean, sea and coastal areas show varying degrees of impact from the multiple human activities carried out in the terrestrial as well as in the aquatic environment. Ecology is a science which studies the relationship between organisms and the surrounding environment and in the modern era, the marine world is getting increasing attention. For centuries it has been the final reservoir of human garbage; later it became an oil farm with a concomitant increase of coastal population growth and unplanned growth of the fishing industry and the increasing use of sea routes for cargo transport and recreational uses (cruises). All this led to rising contamination with negative effects on biota and even human health. It is then imperative to know the current situation of the world's oceans: that is the main purpose of this book, to document at a glance the latest research in the field of ocean pollution.

Marine Macro- and Microalgae - An Overview (Paperback): F.Xavier Malcata, Isabel Sousa Pinto, A. Catarina Guedes Marine Macro- and Microalgae - An Overview (Paperback)
F.Xavier Malcata, Isabel Sousa Pinto, A. Catarina Guedes
R1,566 Discovery Miles 15 660 Ships in 10 - 15 working days

The marine environment accounts for most of the biodiversity on our planet, while offering a huge potential for the benefit and wellbeing of mankind. Its extensive resources already constitute the basis of many economic activities - but many more are expected in coming years. This book covers current knowledge on uses of marine algae to obtain bulk and fine chemicals, coupled with optimization of the underlying production and purification processes. Major gaps and potential opportunities in this field are discussed in a critical manner. The currrent trends pertaining to marine macro- and microalgae are explained in a simple and understandable writing style. This book covers a wide variety of topics, and as such it will be appropriate as both student text and reference for advances researchers in the field.

Therapeutic and Nutritional Uses of Algae (Paperback): Leonel Pereira Therapeutic and Nutritional Uses of Algae (Paperback)
Leonel Pereira
R1,667 Discovery Miles 16 670 Ships in 10 - 15 working days

Algae have been used since ancient times as food, fodder, fertilizer and as source of medicine. Nowadays seaweeds represent an unlimited source of the raw materials used in pharmaceutical, food industries, medicine and cosmetics. They are nutritionally valuable as fresh or dried vegetables, or as ingredients in a wide variety of prepared foods. In particular, seaweeds contain significant quantities of protein, lipids, minerals and vitamins. There is limited information about the role of algae and algal metabolites in medicine. Only a few taxa have been studied for their use in medicine. Many traditional cultures report curative powers from selected alga, in particular tropical and subtropical marine forms. This is especially true in the maritime areas of Asia, where the sea plays a significant role in daily activities. Nonetheless, at present, only a few genera and species of algae are involved in aspects of medicine and therapy. Beneficial uses of algae or algal products include those that may mimic specific manifestations of human diseases, production of antibiotic compounds, or improvement of human nutrition in obstetrics, dental research, thallassotherapy, and forensic medicine.

Environmental Problems in Marine Biology - Methodological Aspects and Applications (Paperback): Tamara Garcia Barrera, Jose... Environmental Problems in Marine Biology - Methodological Aspects and Applications (Paperback)
Tamara Garcia Barrera, Jose Luis Gomez Ariza
R1,569 Discovery Miles 15 690 Ships in 10 - 15 working days

Marine environment can be affected by several pollutants such as the presence of elements and their chemical species, pharmaceuticals, nanoparticles and other emerging contaminants. Environmental monitoring can be assessed by genomics, proteomics (i.e. redox proteomics), chemical speciation analysis and metallomics, metabolomics as well as other advanced strategies. The present book is a useful methodological tool for researchers and specialists in the field of analytical chemistry, environmental sciences, biochemistry, genomics and toxicology. The book includes for the first time the methodological aspects and applications related to chemical speciation and -omics strategies applied to marine environment.

Aquaculture Science and Engineering (Hardcover, 1st ed. 2022): Balamuralikrishnan Balasubramanian, Wenchao Liu, Govindharajan... Aquaculture Science and Engineering (Hardcover, 1st ed. 2022)
Balamuralikrishnan Balasubramanian, Wenchao Liu, Govindharajan Sattanathan
R5,932 Discovery Miles 59 320 Ships in 18 - 22 working days

This book is about relevant recent research topics in understanding aquaculture for practical approaches; aquatic science, engineering, feed and nutrition, immunology and health are reviewed. The book includes information on why certain fish strains differ in disease resistance, all the current data on fish cell populations, the regulation of the response by factors, and the major histocompatibility complex are explained in detail. The book contains the chapters on nutrition, feed and feed additives, ecology, immunology, microbiology, toxicology, biochemistry, nanotechnology, pharmacology, and biotechnology, among other fields of basic and applied research. Over the past era, scientists have recognized the importance of nutrition in maintaining the health of humans and other animal species, including fish. Humans and other terrestrial animals were the focus of previous research on the links between nutrition, immune response, and disease resistance. However, attempts to conduct similar studies using fish have met with limited success in the last two decades due to a lack of understanding of the immune response in fish. In most facilities, the animals are kept at relatively high densities, causing stress and disease problems are the challenges that we face today and this book opens up the exciting new area of research to truly understand the relationship between fish genetics and immune reactivity. The aquatic immune system turns out to be a crucial reference as aquatic products are increasingly used as model systems for vertebrate immune systems. This book provides that the research students and scientists with a useful text on the latest knowledge of the aquatic feed and nutrition, immune system, cutting-edge technologies, draws everyone's attention to the practice of small-scale aquaculture and provides a guide on how to responsibly use the water ecosystem and the steps needed to develop, test and market fish vaccines. The chapters will serve as introductions to these fields and up-to-date reviews of recent research advances. This book is intended for a wide range of readers, including nutritionists, disease specialists, feed formulators, students, extension specialists, and farmers, as well as university teachers, graduates and doctoral students in zoology, physiology, aquaculture, and biology in general.

Essentials of Fish Biology (Hardcover): Pierce Stubbs Essentials of Fish Biology (Hardcover)
Pierce Stubbs
R3,056 R2,771 Discovery Miles 27 710 Save R285 (9%) Ships in 18 - 22 working days
Inland Fisheries - Conservation and Processing (Hardcover): Satish Chander Agarwal Inland Fisheries - Conservation and Processing (Hardcover)
Satish Chander Agarwal
R5,794 Discovery Miles 57 940 Ships in 10 - 15 working days

In all the developing countries, the vast natural resource have great potentials for the production of fish. Natural water resource are categorized on the basis of altitude, temperature and salinity. The different fish species have adopted as per water ecosystem. Out of identified about 22000 fish species, only 10% belongs to freshwater. Only 107 species have been found suitable as culturable. Hence, major chunk of fish are not cultured by man but used by him as food or other uses. It is therefore, the natural fisheries is very important for human being and proper management and legislation are needed to have the sustainable production. The text of the book is written in simple language so as understandable by scientists, extension workers, students and farmers. References and literature for further reading have been given in the end. Note: T&F does not sell or distribute the Hardback in India, Pakistan, Nepal, Bhutan, Bangladesh and Sri Lanka.

Applications of Environmental Aquatic Chemistry - A Practical Guide, Third Edition (Paperback, 3rd edition): Eugene R. Weiner Applications of Environmental Aquatic Chemistry - A Practical Guide, Third Edition (Paperback, 3rd edition)
Eugene R. Weiner
R1,604 Discovery Miles 16 040 Ships in 10 - 15 working days

Professionals and students who come from disciplines other than chemistry need a concise yet reliable guide that explains key concepts in environmental chemistry, from the fundamental science to the necessary calculations for applying them. Updated and reorganized, Applications of Environmental Aquatic Chemistry: A Practical Guide, Third Edition provides the essential background for understanding and solving the most frequent environmental chemistry problems. Diverse and self-contained chapters offer a centralized and easily navigable framework for finding useful data tables that are ordinarily scattered throughout the literature. Worked examples provide step-by-step details for frequently used calculations, drawing on case histories from real-world environmental applications. Chapters also offer tools for calculating quick estimates of important quantities and practice problems that apply the principles to different conditions. This practical guide provides an ideal basis for self-study, as well as short courses involving the movement and fate of contaminants in the environment. In addition to extensive reorganization and updating, the Third Edition includes a new chapter, Nutrients and Odors: Nitrogen, Phosphorus, and Sulfur, two new appendices, Solubility of Slightly Soluble Metal Salts and Glossary of Acronyms and Abbreviations Used in this Book, and new material and case studies on remediation, stormwater management, algae growth and treatment, odor control, and radioisotopes.

Selective Breeding in Aquaculture: an Introduction (Hardcover, 2009 ed.): Trygve Gjedrem, Matthew Baranski Selective Breeding in Aquaculture: an Introduction (Hardcover, 2009 ed.)
Trygve Gjedrem, Matthew Baranski
R4,811 Discovery Miles 48 110 Ships in 18 - 22 working days

The foundation of quantitative genetics theory was developed during the last century and facilitated many successful breeding programs for cultivated plants and t- restrial livestock. The results have been almost universally impressive, and today nearly all agricultural production utilises genetically improved seed and animals. The aquaculture industry can learn a great deal from these experiences, because the basic theory behind selective breeding is the same for all species. The ?rst published selection experiments in aquaculture started in 1920 s to improve disease resistance in ?sh, but it was not before the 1970 s that the ?rst family based breeding program was initiated for Atlantic salmon in Norway by AKVAFORSK. Unfortunately, the subsequent implementation of selective breeding on a wider scale in aquaculture has been slow, and despite the dramatic gains that have been demonstrated in a number of species, less than 10% of world aquaculture production is currently based on improved stocks. For the long-term sustainability of aquaculture production, there is an urgent need to develop and implement e- cient breeding programs for all species under commercial production. The ability for aquaculture to successfully meet the demands of an ever increasing human p- ulation, will rely on genetically improved stocks that utilise feed, water and land resources in an ef?cient way. Technological advances like genome sequences of aquaculture species, and advanced molecular methods means that there are new and exciting prospects for building on these well-established methods into the future.

Biotechnology of Penaeid Shrimps - Perspectives on Physiology of Growth, Reproduction and Disease Therapeutics (Hardcover):... Biotechnology of Penaeid Shrimps - Perspectives on Physiology of Growth, Reproduction and Disease Therapeutics (Hardcover)
A.D. Diwan
R5,811 Discovery Miles 58 110 Ships in 10 - 15 working days

The main objective of this book is to collect comprehensive information on various aspects of physiology and biotechnology focusing mainly on reproduction, growth, disease control and therapeutics of penaeid shrimps. The book covers fundamental aspects and few applied aspects of biotechnology concerning basic genomics and proteomics, reproduction, growth and disease control and therapeutics of shrimp. This information will be quite useful not only to the aqua-farmers/mariculture experts of the shrimp industry to augment quality shrimp production in captive condition but also to the faculties and students working in different organizations involved in teaching and research activities in shrimp biotechnology. Note: T&F does not sell or distribute the Hardback in India, Pakistan, Nepal, Bhutan, Bangladesh and Sri Lanka.

Ecotoxicology of Marine Organisms (Paperback): Bernardo Duarte, Maria Isabel Violante Cacador Ecotoxicology of Marine Organisms (Paperback)
Bernardo Duarte, Maria Isabel Violante Cacador
R1,554 Discovery Miles 15 540 Ships in 10 - 15 working days

This book presents a comprehensive review of the most recent studies on the impact of contaminants on the marine environment. Conventional and new information, as well as the latest techniques, are presented, which can be applied to several types of marine organisms from bacteria and fungi to animals and algae. Specific topics discussed include the impact of different contaminants on different organisms as well as different approaches and their outcomes in terms of impact assessment. The integration of these techniques is also discussed in order to attain sentinel species and biomarkers to be applied for assessing ecological quality and impact assessment programs and studies.

The Biology of Sole (Paperback): Jose A. Munoz-Cueto, Evaristo Mananos-Sanchez, F. Javier Sanchez Vazquez The Biology of Sole (Paperback)
Jose A. Munoz-Cueto, Evaristo Mananos-Sanchez, F. Javier Sanchez Vazquez
R1,574 Discovery Miles 15 740 Ships in 10 - 15 working days

This book reviews up-to-date knowledge on the biology of sole (Solea senegalensis and S. solea). These flatfish species are increasingly important in Europe both from the ecological and production point of view. This book is divided into two sections: A. general fisheries, aquaculture and engineering overviews; B. physiological, developmental, rhythmic, welfare and genetic aspects which will be of immense interest for the aquaculture industry. Experts, from both academia and research institutes, provide their expertise on sole biology.

Biology of Parrotfishes (Paperback): Andrew S. Hoey, Roberta M. Bonaldo Biology of Parrotfishes (Paperback)
Andrew S. Hoey, Roberta M. Bonaldo
R1,578 Discovery Miles 15 780 Ships in 10 - 15 working days

Parrotfish are found on almost every coral reef in the world. This ubiquity and uniqueness of their feeding action make them one of the most important groups of fishes within coral reef ecosystems. But why, exactly, are parrotfish so important to reefs? Can the evolution of a particular jaw morphology and feeding action really have had such a large impact on the health and functioning of the world's coral reefs? This book introduces the reader to this fascinating group of fishes (Labridae, Scarinae), from the morphological innovation of a jaw that has the power to bite through solid calcium carbonate, to the threats currently faced by parrotfish populations around the world. It contains new insights into their diet and food processing ability, and lifehistories, and concludes with an overview of emerging and future research directions.

Multifunctional Land Uses in Africa - Sustainable Food Security Solutions (Paperback): Elisabeth Simelton, Madelene Ostwald Multifunctional Land Uses in Africa - Sustainable Food Security Solutions (Paperback)
Elisabeth Simelton, Madelene Ostwald
R1,377 Discovery Miles 13 770 Ships in 10 - 15 working days

This book presents contemporary case studies of land use, management practices, and innovation in Africa with a view to exploring how multifunctional land uses can alleviate food insecurity and poverty. Food security and livelihoods in Africa face multiple challenges in the form of feeding a growing population on declining land areas under the impacts of climate change. The overall question is what kind of farming systems can provide resilient livelihoods? This volume presents a selection of existing farming systems that demonstrate how more efficient use of land and natural resources, labour and other inputs can have positive effects on household food security and livelihoods. It examines how aquaculture, integrated water management, peri-urban farming systems, climate-smart agriculture practices and parkland agroforestry contribute multiple benefits. Drawing on case studies from Kenya, Ethiopia, Nigeria and Burkina Faso, contributed by young African scientists, this book provides a unique perspective on multifunctional land use in Africa and illustrates how non-conventional uses can be profitable while promoting social and environmental sustainability. Tapping into the global discussion on land scarcity and linking food security to existing land use change processes, this volume will stimulate readers looking for diversified land uses that are compatible with both household and national food security ambitions. This book will be of great interest to students and scholars of African development, agriculture, food security, land use and environmental management, as well as sustainable development more generally, in addition to policymakers and practitioners working in these areas.

Reproduction and Development in Minor Phyla (Hardcover): T. J Pandian Reproduction and Development in Minor Phyla (Hardcover)
T. J Pandian
R4,086 Discovery Miles 40 860 Ships in 10 - 15 working days

The 26 recognized minor phyla comprise aberrant clades, as most of them terminate as blind offshoots. Untied from the discussion on their phylogenesis of minor phyla, this book is largely devoted, for the first time, to aspects of reproduction and development in minor phyletics. The minor phyla are not as speciose (1,795 species/phylum) as the major phyla (157,066 species/phylum) are. The accumulation of deleterious genes causes inbreeding depression among progenies arising from parthenogenesis, clonal multiplication and selfing hermaphrodites. The reason for the limited species diversity in minor phyla is traced to (i) eutelism in 65.7% of minor phyletics and (ii) existence of 21.6% clonals, (iii) 6.4% parthenogens and (iv) 1.2% selfing hermaphroditism. Gonochorism obligately requires motility to search for a mate. The combination of low motility and gonochorism from Placozoa to hemocoelomatic minor phyla has limited diversity to < 1,000 species. Over 19% of minor phyletics are hermaphrodites. With the need to manifest and maintain dual sexuality, fecundity of hermaphrodites may be reduced to 50% of that in gonochores. Adopting an array of strategies, < 100 hermaphrodites are selfers. In eutelics, mitotic division is ceased in somatic cells after hatching. For the first time, the prevalence of eutelism has been brought to light in numbers of all the six pseudocoelomate phyla and priapulids. Eutelism limits fecundity to 30-300 eggs in free-living pseudocoelomates, priapulids and possibly other hemocoelomates. In them, sperm production is less than that of egg production; as a result, a large fraction of their eggs is sterile. With a high proportion of non-eutelic gametic cells (35%), Nematoda and possibly Nematomorpha and Acanthocephala are more fecund than rotifers, in which the proportion is 15%. Briefly, the reasons for the limited species diversity in minor phyletics are traced to eutelism, parthenogenesis and clonal multiplication. Surprisingly, parthenogenesis and clonal multiplication mutually eliminate each other. This is also true of hermaphroditism and parthenogenesis. However, clonal multiplication is prevalent from structurally simplest Placozoa to the most complex Ascidiacea, except in pseudocoelomates and hemocoelomates. A limited number of cells and cell types, and the consequent structural simplicity facilitate manifestation of parthenogenesis in pseudocoelomates and parasitism in Mesozoa, Myxozoa, 59% of Nematoda, Nematomorpha, Acanthocephala and Pentastomida. Despite hermaphroditism, Bryozoa (5,700 species) and Ascidiacea (3,000 species) are speciose among minor phyla. For the first time, the importance of fusion of fragments or colonies - an event equivalent to gamete fusion at fertilization - is recognized as a source of new gene combination. Besides, the colonies in these minor phyla degenerate and regenerate more or less regularly. Only the fittest degenerated colonies may be rejuvenated and regenerated.

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