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Books > Science & Mathematics > Biology, life sciences > Hydrobiology

The Freshwater Ecosystems of Suriname (Hardcover, 1993 ed.): P.E. Ouboter The Freshwater Ecosystems of Suriname (Hardcover, 1993 ed.)
P.E. Ouboter
R4,538 Discovery Miles 45 380 Ships in 10 - 15 working days

Since the limnological research on the man-made Brokopondo Reservoir in the 'sixties, numerous data have been collected on the ecology of Surinam rivers and swamps. This book is a compilation of these data: it is the first comprehensive survey of the aquatic ecology of one of the peripheral areas of Amazonia. The geomorphology of the country, situated on the Guyana Shield, is the main factor determining the limnological properties of rivers and creeks. This results in an overall picture that is quite different from Amazonia. The emphasis of The Ecosystems of Suriname is on the living aquatic resources, including aquatic and swamp vegetation, phyto and zooplankton, macroinvertebrates, fish, amphibians, reptiles and mammals. Although most of Suriname is still in a pristine state, the human impact on fresh waters is considerable in those areas of rapid economic development, emphasizing the necessity of conservation measures, specially tailored for aquatic ecosystems. The Ecosystems of Suriname is a valuable acquisition for all scientists, environmental managers and others interested in tropical aquatic ecology.

Intrazooplankton Predation (Hardcover, Reprinted from HYDROBIOLOGIA, 198, 1990): Henri J. Dumont, J.G. Tundisi, K. Roche Intrazooplankton Predation (Hardcover, Reprinted from HYDROBIOLOGIA, 198, 1990)
Henri J. Dumont, J.G. Tundisi, K. Roche
R5,620 Discovery Miles 56 200 Ships in 10 - 15 working days
Marine Enzymes Biotechnology: Production and Industrial Applications, Part I - Production of Enzymes, Volume 78 (Hardcover):... Marine Enzymes Biotechnology: Production and Industrial Applications, Part I - Production of Enzymes, Volume 78 (Hardcover)
Fidel Toldra; Volume editing by Se-Kwon Kim
R4,981 R4,171 Discovery Miles 41 710 Save R810 (16%) Ships in 12 - 19 working days

Marine Enzymes Biotechnology: Production and Industrial Applications, Part I, Production of Enzymes provides a huge treasure trove of information on marine organisms. Nowadays, marine organisms are good candidates for enzymes production and have been recognized as a rich source of biological molecules that are of potential interest to various industries. Marine enzymes such as amylases, carboxymethylcellulases, proteases, chitinases, keratinases, xylanases, agarases, lipases, peroxidase and tyrosinases are widely used in the industry for the manufacture of pharmaceuticals, foods, beverages, and confectioneries, as well as in textile and leather processing, and in waste water treatment. The majority of the enzymes used in the industry are of microbial origin because microbial enzymes are relatively more stable than the corresponding enzymes derived from plants and animals.

The Ocean Sunfishes - Evolution, Biology and Conservation (Paperback): Tierney M. Thys, Graeme C. Hays, Jonathan D. R. Houghton The Ocean Sunfishes - Evolution, Biology and Conservation (Paperback)
Tierney M. Thys, Graeme C. Hays, Jonathan D. R. Houghton
R2,173 Discovery Miles 21 730 Ships in 12 - 19 working days

The Ocean Sunfishes: Evolution, Biology and Conservation is the first book to gather into one comprehensive volume our fundamental knowledge of the world-record holding, charismatic ocean behemoths in the family Molidae. From evolution and phylogeny to biotoxins, biomechanics, parasites, husbandry and popular culture, it outlines recent and future research from leading sunfish experts worldwide This synthesis includes diet, foraging behavior, migration and fisheries bycatch and overhauls long-standing and outdated perceptions. This book provides the essential go-to resource for both lay and academic audiences alike and anyone interested in exploring one of the ocean's most elusive and captivating group of fishes.

Marine Hard Bottom Communities - Patterns, Dynamics, Diversity, and Change (Hardcover, 2009 ed.): Martin Wahl Marine Hard Bottom Communities - Patterns, Dynamics, Diversity, and Change (Hardcover, 2009 ed.)
Martin Wahl
R7,017 Discovery Miles 70 170 Ships in 12 - 19 working days

Marine hard bottoms feature some of the most spectacular and diverse biological communities on this planet. These not only contain a rich treasure of genetic, taxonomic and functional information but also deliver irreplaceable ecosystem services. At the same time, they are highly vulnerable and increasingly threatened by anthropogenic pressures. This volume has collected contributions by 50 scientists from numerous biogeographic regions, dealing with characteristics of hard bottom communities. Distributional patterns in space and time are described, followed by analyses of the intrinsic and extrinsic dynamics producing these patterns. A strong emphasis is placed on the ongoing changes occurring in the structure and diversity of these communities in response to spiralling environmental impacts, and on state-of-the-art countermeasures aiming to preserve these ecological treasures. Finally, various values of diversity are assessed, hopefully as an incentive for enhanced conservation efforts.

Seaweed in Health and Disease Prevention (Hardcover): Joel Fleurence, Ira Levine Seaweed in Health and Disease Prevention (Hardcover)
Joel Fleurence, Ira Levine
R3,620 Discovery Miles 36 200 Ships in 12 - 19 working days

Seaweed in Health and Disease Prevention presents the potential usage of seaweed, macroalgae, and their extracts for enhancing health and disease. The book explores the possibilities in a comprehensive way, including outlining how seaweed can be used as a source of macronutrients and micronutrients, as well as nutraceuticals. The commercial value of seaweed for human consumption is increasing year-over-year, and some countries harvest several million tons annually. This text lays out the properties and effects of seaweeds and their use in the food industry, offering a holistic view of the ability of seaweed to impact or effect angiogenesis, tumors, diabetes and glucose control, oxidative stress, fungal infections, inflammation and infection, the gut, and the liver.

Humpback Dolphins (Sousa spp.): Current Status and Conservation, Part 2, Volume 73 (Hardcover): Thomas Allen Jefferson, Barbara... Humpback Dolphins (Sousa spp.): Current Status and Conservation, Part 2, Volume 73 (Hardcover)
Thomas Allen Jefferson, Barbara E. Curry
R5,833 R4,881 Discovery Miles 48 810 Save R952 (16%) Ships in 12 - 19 working days

Humpback Dolphins (Sousa spp.): Current Status and Conservation, Part 2 is part of Advances in Marine Biology, a series that has been providing in-depth and up-to-date reviews on all aspects of marine biology since 1963 - more than 50 years of outstanding coverage from a reference that is well known for its contents and editing. This latest addition to the series includes updates on many topics that will appeal to postgraduates and researchers in marine biology, fisheries science, ecology, zoology, and biological oceanography. Specialty areas for the series include marine science, both applied and basic, a wide range of topical areas from all corners of marine ecology, oceanography, fisheries management, and molecular biology, and the full range of geographic areas from polar seas to tropical coral reefs.

Marine Benthic Vegetation - Recent Changes and the Effects of Eutrophication (Hardcover, 1996 ed.): Winfried Schramm, Pieter N.... Marine Benthic Vegetation - Recent Changes and the Effects of Eutrophication (Hardcover, 1996 ed.)
Winfried Schramm, Pieter N. Nienhuis
R5,868 Discovery Miles 58 680 Ships in 10 - 15 working days

Increasing amounts of various types of wastes and pollutants including nutrients enter the coastal waters via rivers, direct discharges from land drainage systems, diffuse land runoff, dumping and via the atmosphere. This has led to coastal eutrophication and in extreme cases to hypertrophication. Until recently, coastal eutrophication and the resulting effects on marine macrophytes were mainly treated as local short-term problems. However, the local nearshore problems developed into overall coastal and inshore phenomena, and recently we have been facing coastal eutrophication problems on a global scale.
This book is the first comprehensive document, systematically covering the entire coastline of Europe, on the effects of eutrophication on the marine benthic vegetation.

Seaweed Sustainability - Food and Non-Food Applications (Hardcover): Brijesh K. Tiwari Seaweed Sustainability - Food and Non-Food Applications (Hardcover)
Brijesh K. Tiwari
R3,615 Discovery Miles 36 150 Ships in 12 - 19 working days

Seaweed Sustainability: Food and Non-Food Applications is the only evidence-based resource that offers an abundance of information on the applications of seaweed as a solution to meet an increasing global demand for sustainable food source. The book uncovers seaweed potential and describes the various sources of seaweed, the role of seaweeds as a sustainable source for human food and animal feeds, and the role of seaweed farming for sustainability. In addition to harvesting and processing information, the book discusses the benefits of seaweed in human nutrition and its nutraceutical properties.

Advances in Marine Biology, Volume 71 (Hardcover): Barbara E. Curry Advances in Marine Biology, Volume 71 (Hardcover)
Barbara E. Curry
R5,472 R4,577 Discovery Miles 45 770 Save R895 (16%) Ships in 12 - 19 working days

The series Advances in Marine Biology has been providing in-depth and up-to-date reviews on all aspects of marine biology since 1963 - more than 50 years of outstanding coverage from a reference that is well known for its contents and editing. This latest addition to the series includes updates on many topics that will appeal to postgraduates and researchers in marine biology, fisheries science, ecology, zoology, and biological oceanography. Specialty areas for the series include marine science, both applied and basic, a wide range of topical areas from all areas of marine ecology, oceanography, fisheries management, and molecular biology, and the full range of geographic areas from polar seas to tropical coral reefs.

Advances in Marine Biology, Volume 70 (Hardcover): Barbara E. Curry Advances in Marine Biology, Volume 70 (Hardcover)
Barbara E. Curry
R5,482 R4,588 Discovery Miles 45 880 Save R894 (16%) Ships in 12 - 19 working days

Advances in Marine Biology has been providing in-depth and up-to-date reviews on all aspects of marine biology since 1963--over 40 years of outstanding coverage! The series is well known for its excellent reviews and editing. Now edited by Barbara E. Curry (University of Central Florida, USA) with an internationally renowned Editorial Board, the serial publishes in-depth and up-to-date content on many topics that will appeal to postgraduates and researchers in marine biology, fisheries science, ecology, zoology, and biological oceanography. Volumes cover all areas of marine science, both applied and basic, a wide range of topical areas from all areas of marine ecology, oceanography, fisheries management and molecular biology and the full range of geographic areas from polar seas to tropical coral reefs.

Big Meg - The Story of the Largest, Fiercest and Most Mysterious Shark (Hardcover): Tim Flannery, Emma Flannery Big Meg - The Story of the Largest, Fiercest and Most Mysterious Shark (Hardcover)
Tim Flannery, Emma Flannery
R430 R384 Discovery Miles 3 840 Save R46 (11%) Ships in 5 - 10 working days

Imagine a ferocious marine hunter up to 20 metres long, weighing twice as much as a humpback whale and ten times more than Tyrannosaurus rex. With jaws that open three metres wide, crammed with 276 serrated fangs, it can bite down with the greatest force of any animal that has ever lived. This is the Megalodon, and it once existed 3 million years ago. Next to the dinosaurs, wiped out 66 million years ago, it is but a stone's throw into our murky past when monsters reigned. Its name means 'giant tooth' but everything about it is gigantic: its exceptional lifespan, each stalking the ocean deep for more than a century, and its pups, born at more than two metres long, having likely eaten their siblings in the womb. Marking a milestone in paleontology, in Big Meg acclaimed conservationist, palaeontologist and explorer Tim Flannery and his scientist daughter Emma tell the story of this enthralling great shark for the first time - what we know about where and how it lived, bred, hunted and died. He also shows how it continues to fascinate us. Despite its extinction, the big meg continues to kill a few humans each year: its victims those who dive in murky and dangerous waters in search of its glorious, magnetically beautiful relics. From the stories we tell about it, to the quest to uncover more of the mystery surrounding it, this is the biography of the ultimate apex predator and a compelling exploration of its awesome grip on the human imagination today.

Biology and Aquaculture of Tilapia (Hardcover): Jose Fernando Lopez-Olmeda, Francisco Javier Sanchez-Vazquez, Rodrigo... Biology and Aquaculture of Tilapia (Hardcover)
Jose Fernando Lopez-Olmeda, Francisco Javier Sanchez-Vazquez, Rodrigo Fortes-Silva
R4,935 Discovery Miles 49 350 Ships in 12 - 19 working days

This book reviews up-to-date knowledge on the biology and aquaculture of tilapia, with special focus on the Nile tilapia (Oreochromis niloticus). Tilapia are a group of fish species that have become one of the most cultured worldwide, currently having a big economic impact on both developed and developing countries. The first 12 chapters of the present book cover different aspects of tilapia biology such as genetics, nutrition, osmoregulation, pathology, reproduction and development. Each chapter includes both basic knowledge and its application to tilapia culture. The last 3 chapters are devoted to cutting-edge techniques for the industry of tilapia aquaculture. Experts from both academia and research institutes provide their expertise on the present book.

Creation and Evolution in the Early American Scientific Affiliation (Hardcover): Mark A. Kalthoff Creation and Evolution in the Early American Scientific Affiliation (Hardcover)
Mark A. Kalthoff
R4,970 Discovery Miles 49 700 Ships in 12 - 19 working days

Originally published in 1995, Creation and Evolution in the Early American Scientific Affiliation is the tenth volume in the series, Creationism in Twentieth Century America, reissued in 2021. The volume comprises of original primary sources from the American Science Affiliation, a group formed following an invitation from the president of the Moody Bible Institute in Chicago, in answer to the perceived need for an academic society for American Evangelical Scientists to explicate the relationship between science and faith. The society confronted the debate between creation and evolution head on, leaving a paper trail documenting their thoughts and struggles. This diverse and expansive collection includes 53 selections that appeared during the organisation's first two decades and focuses on the encounter between science and American evangelicalism in the twentieth century, in particular the debates surrounding the ever-increasing preference for evolutionary theory. The collection will be of especial interest to natural historians, and theologians as well as academics of philosophy, and history.

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, …
R6,816 Discovery Miles 68 160 Ships in 12 - 19 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.

Ecology of Atlantic Salmon and Brown Trout - Habitat as a template for life histories (Hardcover, Edition.): Bror Jonsson, Nina... Ecology of Atlantic Salmon and Brown Trout - Habitat as a template for life histories (Hardcover, Edition.)
Bror Jonsson, Nina Jonsson
R10,481 Discovery Miles 104 810 Ships in 12 - 19 working days

Destruction of habitat is the major cause for loss of biodiversity including variation in life history and habitat ecology. Each species and population adapts to its environment, adaptations visible in morphology, ecology, behaviour, physiology and genetics. Here, the authors present the population ecology of Atlantic salmon and brown trout and how it is influenced by the environment in terms of growth, migration, spawning and recruitment. Salmonids appeared as freshwater fish some 50 million years ago. Atlantic salmon and brown trout evolved in the Atlantic basin, Atlantic salmon in North America and Europe, brown trout in Europe, Northern Africa and Western Asia. The species live in small streams as well as large rivers, lakes, estuaries, coastal seas and oceans, with brown trout better adapted to small streams and less well adapted to feeding in the ocean than Atlantic salmon. Smolt and adult sizes and longevity are constrained by habitat conditions of populations spawning in small streams. Feeding, wintering and spawning opportunities influence migratory versus resident lifestyles, while the growth rate influences egg size and number, age at maturity, reproductive success and longevity. Further, early experiences influence later performance. For instance, juvenile behaviour influences adult homing, competition for spawning habitat, partner finding and predator avoidance.
The abundance of wild Atlantic salmon populations has declined in recent years; climate change and escaped farmed salmon are major threats. The climate influences through changes in temperature and flow, while escaped farmed salmon do so through ecological competition, interbreeding and the spreading of contagious diseases. The authors pinpoint essential problems and offer suggestions as to how they can be reduced. In this context, population enhancement, habitat restoration and management are also discussed. The text closes with a presentation of what the authors view as major scientific challenges in ecological research on these species."

Environmental Assessment and Habitat Evaluation of the Upper Great Lakes Connecting Channels (Hardcover): Mohamed Munawar, T.... Environmental Assessment and Habitat Evaluation of the Upper Great Lakes Connecting Channels (Hardcover)
Mohamed Munawar, T. Edsall
R2,636 Discovery Miles 26 360 Ships in 12 - 19 working days

Biota of the St. Marys River: habitat evaluation and environmental assessment.- Polycyclic aromatic hydrocarbons in surficial sediments and caged mussels of the St. Marys River, 1985.- Effects of pollution on benthic invertebrate communities of the St. Marys River, 1985.- Use of a geographic information system data base to measure and evaluate wetland changes in the St. Marys River, Michigan.- Limnological aspects of the St. Clair River.- Distribution and abundance of young fish in the St. Clair River and associated waters, Ontario.- Distribution and abundance of young fish in Chenal Ecarte and Chematogen Channel in the St. Clair River delta, Ontario.- Environmental quality assessment of the St. Clair River as reflected by the distribution of benthic macroinvertebrates in 1985.- Growth and overwinter survival of the Asiatic clam, Corbicula fluminea, in the St. Clair River, Michigan.- Deformities in larval Procladius spp. and dominant Chironomini from the St. Clair River.- Biota of Lake St. Clair: habitat evaluation and environmental assessment.- The plankton ecology of Lake St. Clair, 1984.- Plankton community structure in Lake St. Clair, 1984.- Phosphorus cycling by mussels (Unionidae: Bivalvia) in Lake St. Clair.- Biology of the exotic zebra mussel, Dreissena polymorpha, in relation to native bivalves and its potential impact in Lake St. Clair.- The Detroit River: effects of contaminants and human activities on aquatic plants and animals and their habitats.- Response of bacteria and phytoplankton to contaminated sediments from Trenton Channel, Detroit River.- Tumors in fish from the Detroit River.- Heavy metal contamination of sediments in the Upper Connecting Channels of the Great Lakes.- Application of a microcomputer-based algal fluorescence technique for assessing toxicity: Lake St. Clair and St. Clair River examples.- A method for evaluating the impact of navigationally induced suspended sediments from the Upper Great Lakes Connecting Channels on the primary productivity.- Heavy metals in aquatic macrophytes drifting in a large river.- Distribution of Hexagenia nymphs and visible oil in sediments of the Upper Great Lakes Connecting Channels.- Production of Hexagenia limbata nymphs in contaminated sediments in the Upper Great Lakes Connecting Channels.

Spirals in Time - The Secret Life and Curious Afterlife of Seashells (Paperback): Helen Scales Spirals in Time - The Secret Life and Curious Afterlife of Seashells (Paperback)
Helen Scales 2
R341 Discovery Miles 3 410 Ships in 12 - 19 working days

'A rewarding glimpse of another world' THE GUARDIAN Seashells are the sculpted homes of a remarkable group of animals: the molluscs. These are some of the most ancient and successful animals on the planet, and they have fascinating tales to tell. Spirals in Time charts the course of shells through history, from the first jewelry and the oldest currencies through to their use as potent symbols of sex and death, prestige and war, not to mention a nutritious (and tasty) source of food. In this book, Helen Scales leads us on a journey into the realm of these undersea marvels. She goes in search of everything from snails that 'fly' underwater to octopuses accused of stealing shells and giant mussels with golden beards. Shells are also bellwethers of our impact on the natural world. The effects of overfishing and pollution are, of course, serious concerns, but perhaps more worrying is ocean acidification, which causes shells to simply melt away. Spirals in Time urges you to ponder how seashells can reconnect us with nature, and heal the rift between ourselves and the living world. One of the books of the year - Nature, Guardian, The Economist, The Times

How Life Increases Biodiversity - An Autocatalytic Hypothesis (Hardcover): David Seaborg How Life Increases Biodiversity - An Autocatalytic Hypothesis (Hardcover)
David Seaborg
R5,385 Discovery Miles 53 850 Ships in 12 - 19 working days

Describes a hypothesis that ecosystems maximize biodiversity Suggests modified version of the dominant paradigm in population biology and evolution Discusses specific examples of events and phenomena that positively affect the diversity of life Presents a new view likely to elicit deeper discussions of biodiversity

Biology and Evolution of the Mollusca, Volume 2 (Paperback): David R Lindberg, Winston Frank Ponder, Juliet Mary Ponder Biology and Evolution of the Mollusca, Volume 2 (Paperback)
David R Lindberg, Winston Frank Ponder, Juliet Mary Ponder
R1,677 Discovery Miles 16 770 Ships in 12 - 19 working days

This volume provides individual treatments of the major molluscan taxa. Each chapter provides an overview of the evolution, phylogeny and classification of a group of molluscs, as well as more specific and detailed coverage of their biology (reproduction, feeding and digestion, excretion, respiration etc.), their long fossil record and aspects of their natural history. The book is illustrated with hundreds of colour figures. In both volumes, concepts are summarised in colour-coded illustrations. Key selling features: Comprehensively reviews molluscan biology and evolutionary history Includes a description the anatomy and physiology of anatomical systems Up to date treatment with a comprehensive bibliography Reviews the phylogenetic history of the major molluscan lineages

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
R4,334 Discovery Miles 43 340 Ships in 12 - 19 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.

Environmental biology of darters - Papers from a symposium on the comparative behavior, ecology, and life histories of darters... Environmental biology of darters - Papers from a symposium on the comparative behavior, ecology, and life histories of darters (Etheostomatini), held during the 62nd annual meeting of the American Society of Ichthyologists and Herpetologists at DeKalb, Illinois, U.S.A., June 14-15, 1982 (Hardcover)
David G. Lindquist, Lawrence M. Page
R2,909 Discovery Miles 29 090 Ships in 10 - 15 working days

The The following following set set of of papers papers is is mainly mainly a a representa representa have have been been overdue overdue since since the the pioneering pioneering work work of of tive tive sample sample from from 19 19 presentations presentations at at a a special special sym sym Howard Howard Winn Winn in in the the late late 1950's. 1950's. Darters Darters are are rela rela posium posium on on the the comparative comparative behavior, behavior, ecology, ecology, and and tively tively sedentary sedentary and and can can be be easily easily observed observed and and life life histories histories of of darters darters held held during during the the 62nd 62nd (14-15 (14-15 experimentally experimentally manipulated manipulated in in their their natural natural hab- . . June, June, 1982) 1982) annual annual meeting meeting of of the the American American So So itats. itats. They They can can be be transported transported alive alive with with relative relative ciety ciety of of Ichthyologists Ichthyologists and and Herpetologists Herpetologists on on the the ease, ease, and and readily readily acclimate acclimate to to controlled controlled conditions conditions campus campus of of Northern Northern Illinois Illinois University, University, DeKalb, DeKalb, of of the the laboratory laboratory aquarium. aquarium. The The male male nuptial nuptial color color Illinois, Illinois, U. S. A. U. S. A."

Reproduction and Development in Minor Phyla (Hardcover): T. J Pandian Reproduction and Development in Minor Phyla (Hardcover)
T. J Pandian
R4,042 Discovery Miles 40 420 Ships in 12 - 19 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.

Success Stories in Asian Aquaculture (Hardcover, 2010 ed.): Sena S. De Silva, F. Brian Davy Success Stories in Asian Aquaculture (Hardcover, 2010 ed.)
Sena S. De Silva, F. Brian Davy
R3,002 Discovery Miles 30 020 Ships in 10 - 15 working days

case studies of successful governance models could be referred to by others in order to improve the management of the sector. This is the initial step toward compiling stories of aquaculture successes, and the editorial team is to be congratulated for its great efforts. In approaching this difficult assignment, the team benefited from the leadership of the Network of Aquaculture Centres for Asia and the Pacific (NACA), and the support of the World Fisheries Trust (WFT) as well as the Institute for International Sustainable Development (IISD) of Canada. We hope that the team will continue its endeavor in producing other aquaculture success stories, also from other regions of the world. Rome, Italy Jiansan Jia Pr eface We are moving into a turbulent and an uncertain era, particularly in respect of the future food needs. Given the push to sustainability, the rise in food prices, and the impending concerns around climate change and related complexity on providing the food needs for an increasing global population, it is time to address coping strategies. It is in this context that the issue on where will aquaculture development move in the future is taken up.

Marine Biology: A Very Short Introduction (Paperback, 2nd Revised edition): Philip V. Mladenov Marine Biology: A Very Short Introduction (Paperback, 2nd Revised edition)
Philip V. Mladenov
R302 R274 Discovery Miles 2 740 Save R28 (9%) Ships in 9 - 17 working days

The oceans are our planet's most distinctive and imposing natural habitat. They cover 71 per cent of its surface; support a remarkably diverse and exquisitely adapted array of life forms, from microscopic viruses, bacteria, and plankton to the largest existing animals; and possess many of Earth's most significant, intriguing, and inaccessible ecosystems. In an era in which humans are significantly altering the global environment, the oceans are undergoing rapid and profound changes. The study of marine biology is thus taking on added importance and urgency as people struggle to understand and manage these changes to protect our marine ecosystems. Healthy oceans produce half of the oxygen we breathe; stabilize our climate; create ecosystems that protect our coasts from storms; provide us with abundant food; and host diverse organisms that provide us with natural products for medicine and biotechnology. In this Very Short Introduction, marine biologist Philip Mladenov provides an accessible and up-to-date overview of marine biology, offering a tour of marine life and marine processes that ranges from the unimaginably abundant microscopic organisms that drive the oceans' food web to the apex predators that we exploit for food; from polar ocean ecosystems to tropical coral reefs; and from the luxurious kelp beds of the coastal ocean to deep-ocean hydrothermal vents where life exists without the energy of the sun. Throughout the book he considers the human impacts on marine life including overfishing, plastic and nutrient pollution, the spread of exotic species, and ocean warming and acidification. He discusses the threats these pose to our welfare, and the actions required to put us on a path to a more sustainable relationship with our oceans so that they can be restored and protected for future generations. Mladenov concludes with a new chapter offering an inspiring vision for the future of our oceans in 2050 that can be realised if we are wise enough to accelerate actions already underway and be bold with implementing new approaches. The next decade will decide the state of the oceans that we leave behind for future generations. ABOUT THE SERIES: The Very Short Introductions series from Oxford University Press contains hundreds of titles in almost every subject area. These pocket-sized books are the perfect way to get ahead in a new subject quickly. Our expert authors combine facts, analysis, perspective, new ideas, and enthusiasm to make interesting and challenging topics highly readable.

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